#!/usr/bin/env python3
"""Generate Rust benchmark fixture (~2-3K LOC) for webapp_rs."""

import os, textwrap

BASE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "webapp_rs")


def w(path, content):
    full = os.path.join(BASE, path)
    if os.path.exists(full):
        return  # Don't overwrite existing files
    os.makedirs(os.path.dirname(full), exist_ok=True)
    with open(full, "w") as f:
        f.write(textwrap.dedent(content).lstrip())


# ─── utils/mod.rs ───
w(
    "utils/mod.rs",
    """\
    pub mod helpers;
    pub mod crypto;
    """,
)

# ─── utils/crypto.rs (referenced by existing models/user.rs) ───
w(
    "utils/crypto.rs",
    """\
    /// Cryptographic utility functions.

    /// Hash a password using a simple simulated algorithm.
    pub fn hash_password(password: &str) -> String {
        format!("hashed:{}", password.len())
    }

    /// Verify a password against a stored hash.
    pub fn verify_password(password: &str, hash: &str) -> bool {
        hash == &format!("hashed:{}", password.len())
    }
    """,
)

# ─── utils/helpers.rs ───
w(
    "utils/helpers.rs",
    """\
    use std::fmt;
    use std::time::{SystemTime, UNIX_EPOCH};

    /// A simple logger that prefixes messages with a module name.
    pub struct Logger {
        /// The name of the module this logger belongs to.
        pub name: String,
    }

    impl Logger {
        /// Log an informational message.
        pub fn info(&self, msg: &str) {
            println!("[{}] INFO: {}", self.name, msg);
        }

        /// Log a warning message.
        pub fn warn(&self, msg: &str) {
            println!("[{}] WARN: {}", self.name, msg);
        }

        /// Log an error message.
        pub fn error(&self, msg: &str) {
            eprintln!("[{}] ERROR: {}", self.name, msg);
        }
    }

    impl fmt::Display for Logger {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            write!(f, "Logger({})", self.name)
        }
    }

    /// Create a new logger instance for the given module name.
    pub fn get_logger(name: &str) -> Logger {
        Logger {
            name: name.to_string(),
        }
    }

    /// Validate that a request has required fields (path, method).
    pub fn validate_request(path: &str, method: &str) -> Result<(), String> {
        if path.is_empty() {
            return Err("Request path cannot be empty".to_string());
        }
        if method.is_empty() {
            return Err("Request method cannot be empty".to_string());
        }
        Ok(())
    }

    /// Generate a unique request identifier based on timestamp.
    pub fn generate_request_id() -> String {
        let ts = SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .unwrap_or_default()
            .as_millis();
        format!("req-{}-{}", ts, ts % 1000)
    }

    /// Sanitize user input by removing control characters and trimming.
    pub fn sanitize_input(value: &str) -> String {
        value
            .chars()
            .filter(|c| !c.is_control())
            .collect::<String>()
            .trim()
            .to_string()
    }

    /// Paginate a slice of items, returning the requested page.
    pub fn paginate<T: Clone>(items: &[T], page: usize, per_page: usize) -> Vec<T> {
        let start = (page.saturating_sub(1)) * per_page;
        items.iter().skip(start).take(per_page).cloned().collect()
    }

    /// Mask sensitive fields in a string value for safe logging.
    pub fn mask_sensitive(value: &str) -> String {
        if value.len() > 4 {
            format!("{}***{}", &value[..2], &value[value.len() - 2..])
        } else {
            "***".to_string()
        }
    }
    """,
)

# ─── app_errors.rs ───
w(
    "app_errors.rs",
    """\
    use std::fmt;

    use crate::utils::helpers::get_logger;

    /// Extended application error types beyond the base AppError.
    #[derive(Debug)]
    pub enum AppErrorExt {
        /// A validation error with field name and message.
        Validation {
            /// The field that failed validation.
            field: String,
            /// The validation error message.
            message: String,
        },
        /// A payment processing error.
        Payment {
            /// The transaction ID if available.
            transaction_id: Option<String>,
            /// The error message.
            message: String,
        },
        /// A resource was not found.
        NotFound {
            /// The type of resource.
            resource: String,
            /// The identifier that was looked up.
            identifier: String,
        },
        /// Rate limit exceeded.
        RateLimit {
            /// Seconds until the rate limit resets.
            retry_after: u64,
        },
    }

    impl fmt::Display for AppErrorExt {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            let logger = get_logger("app_errors");
            match self {
                AppErrorExt::Validation { field, message } => {
                    logger.info(&format!("Validation error on field: {}", field));
                    write!(f, "Validation error on '{}': {}", field, message)
                }
                AppErrorExt::Payment {
                    transaction_id,
                    message,
                } => {
                    let txn = transaction_id.as_deref().unwrap_or("unknown");
                    logger.info(&format!("Payment error for txn: {}", txn));
                    write!(f, "Payment error (txn: {}): {}", txn, message)
                }
                AppErrorExt::NotFound {
                    resource,
                    identifier,
                } => {
                    logger.info(&format!("{} not found: {}", resource, identifier));
                    write!(f, "{} with id '{}' not found", resource, identifier)
                }
                AppErrorExt::RateLimit { retry_after } => {
                    logger.warn(&format!("Rate limited, retry after {}s", retry_after));
                    write!(f, "Rate limit exceeded. Retry after {}s", retry_after)
                }
            }
        }
    }

    impl std::error::Error for AppErrorExt {}

    /// Convert an AppErrorExt into an HTTP status code.
    pub fn status_code(err: &AppErrorExt) -> u16 {
        match err {
            AppErrorExt::Validation { .. } => 400,
            AppErrorExt::Payment { .. } => 402,
            AppErrorExt::NotFound { .. } => 404,
            AppErrorExt::RateLimit { .. } => 429,
        }
    }
    """,
)

# ─── database/mod.rs ───
w(
    "database/mod.rs",
    """\
    pub mod pool;
    pub mod connection;
    pub mod queries;
    pub mod migrations;
    """,
)

# ─── database/pool.rs ───
w(
    "database/pool.rs",
    """\
    use crate::utils::helpers::get_logger;

    /// A handle representing a single borrowed connection from the pool.
    pub struct ConnectionHandle {
        /// The connection identifier.
        pub id: String,
        /// Whether this handle is currently in use.
        pub in_use: bool,
        /// Number of queries executed on this handle.
        pub query_count: u64,
    }

    /// A pool of database connections with configurable size.
    pub struct ConnectionPool {
        /// The data source name / connection string.
        dsn: String,
        /// Maximum number of connections in the pool.
        max_size: usize,
        /// All connection handles managed by this pool.
        connections: Vec<ConnectionHandle>,
        /// Whether the pool has been initialized.
        initialized: bool,
    }

    impl ConnectionPool {
        /// Create a new connection pool with the given DSN and size.
        pub fn new(dsn: &str, max_size: usize) -> Self {
            let logger = get_logger("database.pool");
            logger.info(&format!("Creating pool: dsn={}, size={}", dsn, max_size));
            Self {
                dsn: dsn.to_string(),
                max_size,
                connections: Vec::new(),
                initialized: false,
            }
        }

        /// Initialize the pool by creating all connections.
        pub fn initialize(&mut self) -> Result<(), String> {
            let logger = get_logger("database.pool");
            if self.initialized {
                return Ok(());
            }
            for i in 0..self.max_size {
                self.connections.push(ConnectionHandle {
                    id: format!("conn-{}", i),
                    in_use: false,
                    query_count: 0,
                });
            }
            self.initialized = true;
            logger.info(&format!("Pool initialized with {} connections", self.max_size));
            Ok(())
        }

        /// Acquire a connection from the pool.
        pub fn get_connection(&mut self) -> Result<&mut ConnectionHandle, String> {
            let logger = get_logger("database.pool");
            if !self.initialized {
                self.initialize()?;
            }
            for conn in &mut self.connections {
                if !conn.in_use {
                    conn.in_use = true;
                    conn.query_count += 1;
                    logger.info(&format!("Acquired connection {}", conn.id));
                    return Ok(conn);
                }
            }
            Err("Connection pool exhausted".to_string())
        }

        /// Release a connection back to the pool by ID.
        pub fn release_connection(&mut self, conn_id: &str) {
            let logger = get_logger("database.pool");
            for conn in &mut self.connections {
                if conn.id == conn_id {
                    conn.in_use = false;
                    logger.info(&format!("Released connection {}", conn_id));
                    return;
                }
            }
        }

        /// Return pool statistics.
        pub fn stats(&self) -> (usize, usize, usize) {
            let active = self.connections.iter().filter(|c| c.in_use).count();
            let idle = self.connections.len() - active;
            (self.connections.len(), active, idle)
        }

        /// Shut down the pool and drop all connections.
        pub fn shutdown(&mut self) {
            let logger = get_logger("database.pool");
            self.connections.clear();
            self.initialized = false;
            logger.info("Pool shut down");
        }
    }
    """,
)

# ─── database/connection.rs ───
w(
    "database/connection.rs",
    """\
    use crate::utils::helpers::get_logger;
    use crate::database::pool::ConnectionPool;

    /// The result of a database query.
    pub struct QueryResult {
        /// Rows returned as key-value pairs.
        pub rows: Vec<Vec<(String, String)>>,
        /// Number of rows affected.
        pub affected: usize,
        /// Duration of the query in milliseconds.
        pub duration_ms: u64,
    }

    /// A high-level database connection wrapping a connection pool.
    pub struct DatabaseConnection {
        /// The underlying connection pool.
        pool: ConnectionPool,
        /// Current transaction nesting depth.
        transaction_depth: u32,
    }

    impl DatabaseConnection {
        /// Create a new database connection backed by the given pool.
        pub fn new(pool: ConnectionPool) -> Self {
            let logger = get_logger("database.connection");
            logger.info("DatabaseConnection created");
            Self {
                pool,
                transaction_depth: 0,
            }
        }

        /// Execute a raw SQL query and return the result.
        pub fn execute_query(&mut self, sql: &str, _params: &[&str]) -> Result<QueryResult, String> {
            let logger = get_logger("database.connection");
            let _handle = self.pool.get_connection()?;
            logger.info(&format!("Executing: {}...", &sql[..sql.len().min(80)]));
            Ok(QueryResult {
                rows: Vec::new(),
                affected: 0,
                duration_ms: 1,
            })
        }

        /// Find a single record by its ID.
        pub fn find_by_id(&mut self, table: &str, id: &str) -> Result<Option<Vec<(String, String)>>, String> {
            let logger = get_logger("database.connection");
            logger.info(&format!("Finding {} by id {}", table, id));
            let result = self.execute_query(
                &format!("SELECT * FROM {} WHERE id = ?", table),
                &[id],
            )?;
            Ok(result.rows.into_iter().next())
        }

        /// Insert a new record into the given table.
        pub fn insert(&mut self, table: &str, data: &[(&str, &str)]) -> Result<String, String> {
            let logger = get_logger("database.connection");
            let cols: Vec<&str> = data.iter().map(|(k, _)| *k).collect();
            let vals: Vec<&str> = data.iter().map(|(_, v)| *v).collect();
            let sql = format!(
                "INSERT INTO {} ({}) VALUES ({})",
                table,
                cols.join(", "),
                vals.iter().map(|_| "?").collect::<Vec<_>>().join(", ")
            );
            self.execute_query(&sql, &vals)?;
            logger.info(&format!("Inserted into {}", table));
            Ok("generated-id".to_string())
        }

        /// Update a record by its ID.
        pub fn update(&mut self, table: &str, id: &str, data: &[(&str, &str)]) -> Result<usize, String> {
            let logger = get_logger("database.connection");
            let sets: Vec<String> = data.iter().map(|(k, _)| format!("{} = ?", k)).collect();
            let vals: Vec<&str> = data.iter().map(|(_, v)| *v).collect();
            let sql = format!("UPDATE {} SET {} WHERE id = ?", table, sets.join(", "));
            let mut params = vals;
            params.push(id);
            let result = self.execute_query(&sql, &params)?;
            logger.info(&format!("Updated {} row(s) in {}", result.affected, table));
            Ok(result.affected)
        }

        /// Delete a record by its ID.
        pub fn delete(&mut self, table: &str, id: &str) -> Result<bool, String> {
            let logger = get_logger("database.connection");
            let sql = format!("DELETE FROM {} WHERE id = ?", table);
            let result = self.execute_query(&sql, &[id])?;
            logger.info(&format!("Deleted from {}: affected={}", table, result.affected));
            Ok(result.affected > 0)
        }

        /// Begin a database transaction.
        pub fn begin_transaction(&mut self) -> Result<(), String> {
            let logger = get_logger("database.connection");
            self.transaction_depth += 1;
            if self.transaction_depth == 1 {
                logger.info("Transaction started");
            }
            Ok(())
        }

        /// Commit the current transaction.
        pub fn commit(&mut self) -> Result<(), String> {
            let logger = get_logger("database.connection");
            if self.transaction_depth > 0 {
                self.transaction_depth -= 1;
                if self.transaction_depth == 0 {
                    logger.info("Transaction committed");
                }
            }
            Ok(())
        }

        /// Rollback the current transaction.
        pub fn rollback(&mut self) -> Result<(), String> {
            let logger = get_logger("database.connection");
            self.transaction_depth = 0;
            logger.info("Transaction rolled back");
            Ok(())
        }
    }
    """,
)

# ─── database/queries.rs ───
w(
    "database/queries.rs",
    """\
    use crate::utils::helpers::get_logger;
    use crate::database::connection::{DatabaseConnection, QueryResult};

    /// Query builder for user-related operations.
    pub struct UserQueries<'a> {
        /// Reference to the database connection.
        db: &'a mut DatabaseConnection,
    }

    impl<'a> UserQueries<'a> {
        /// Create a new UserQueries instance.
        pub fn new(db: &'a mut DatabaseConnection) -> Self {
            Self { db }
        }

        /// Find a user by their email address.
        pub fn find_by_email(&mut self, email: &str) -> Result<Option<Vec<(String, String)>>, String> {
            let logger = get_logger("database.queries.user");
            logger.info(&format!("Finding user by email: {}", email));
            let result = self.db.execute_query("SELECT * FROM users WHERE email = ?", &[email])?;
            Ok(result.rows.into_iter().next())
        }

        /// Find all active users with an optional limit.
        pub fn find_active(&mut self, limit: usize) -> Result<Vec<Vec<(String, String)>>, String> {
            let logger = get_logger("database.queries.user");
            logger.info(&format!("Finding active users, limit={}", limit));
            let result = self.db.execute_query("SELECT * FROM users WHERE active = 1 LIMIT ?", &[&limit.to_string()])?;
            Ok(result.rows)
        }

        /// Search users by name or email pattern.
        pub fn search(&mut self, query: &str) -> Result<QueryResult, String> {
            let logger = get_logger("database.queries.user");
            logger.info(&format!("Searching users: {}", query));
            self.db.execute_query("SELECT * FROM users WHERE name LIKE ? OR email LIKE ?", &[query, query])
        }

        /// Soft-delete a user by setting their deleted_at timestamp.
        pub fn soft_delete(&mut self, user_id: &str) -> Result<bool, String> {
            let logger = get_logger("database.queries.user");
            logger.info(&format!("Soft-deleting user {}", user_id));
            let affected = self.db.update("users", user_id, &[("deleted_at", "now")])?;
            Ok(affected > 0)
        }
    }

    /// Query builder for session-related operations.
    pub struct SessionQueries<'a> {
        /// Reference to the database connection.
        db: &'a mut DatabaseConnection,
    }

    impl<'a> SessionQueries<'a> {
        /// Create a new SessionQueries instance.
        pub fn new(db: &'a mut DatabaseConnection) -> Self {
            Self { db }
        }

        /// Find an active session by token hash.
        pub fn find_active_session(&mut self, token: &str) -> Result<Option<Vec<(String, String)>>, String> {
            let logger = get_logger("database.queries.session");
            logger.info("Finding active session by token");
            let result = self.db.execute_query("SELECT * FROM sessions WHERE token_hash = ?", &[token])?;
            Ok(result.rows.into_iter().next())
        }

        /// Create a new session record.
        pub fn create_session(&mut self, user_id: &str, token_hash: &str, ip: &str) -> Result<String, String> {
            let logger = get_logger("database.queries.session");
            logger.info(&format!("Creating session for user {}", user_id));
            self.db.insert("sessions", &[("user_id", user_id), ("token_hash", token_hash), ("ip_address", ip)])
        }

        /// Expire a session by its ID.
        pub fn expire_session(&mut self, session_id: &str) -> Result<bool, String> {
            let logger = get_logger("database.queries.session");
            logger.info(&format!("Expiring session {}", session_id));
            let affected = self.db.update("sessions", session_id, &[("expired_at", "now")])?;
            Ok(affected > 0)
        }
    }

    /// Query builder for payment-related operations.
    pub struct PaymentQueries<'a> {
        /// Reference to the database connection.
        db: &'a mut DatabaseConnection,
    }

    impl<'a> PaymentQueries<'a> {
        /// Create a new PaymentQueries instance.
        pub fn new(db: &'a mut DatabaseConnection) -> Self {
            Self { db }
        }

        /// Find a payment by its transaction ID.
        pub fn find_by_transaction_id(&mut self, txn_id: &str) -> Result<Option<Vec<(String, String)>>, String> {
            let logger = get_logger("database.queries.payment");
            logger.info(&format!("Finding payment by txn: {}", txn_id));
            let result = self.db.execute_query("SELECT * FROM payments WHERE transaction_id = ?", &[txn_id])?;
            Ok(result.rows.into_iter().next())
        }

        /// Find all payments for a user, optionally filtered by status.
        pub fn find_user_payments(&mut self, user_id: &str, status: Option<&str>) -> Result<Vec<Vec<(String, String)>>, String> {
            let logger = get_logger("database.queries.payment");
            logger.info(&format!("Finding payments for user {}", user_id));
            match status {
                Some(s) => {
                    let result = self.db.execute_query(
                        "SELECT * FROM payments WHERE user_id = ? AND status = ?",
                        &[user_id, s],
                    )?;
                    Ok(result.rows)
                }
                None => {
                    let result = self.db.execute_query(
                        "SELECT * FROM payments WHERE user_id = ?",
                        &[user_id],
                    )?;
                    Ok(result.rows)
                }
            }
        }

        /// Create a new payment record.
        pub fn create_payment(&mut self, user_id: &str, amount: &str, currency: &str, txn_id: &str) -> Result<String, String> {
            let logger = get_logger("database.queries.payment");
            logger.info(&format!("Creating payment: {} {} for user {}", amount, currency, user_id));
            self.db.insert("payments", &[
                ("user_id", user_id),
                ("amount", amount),
                ("currency", currency),
                ("transaction_id", txn_id),
                ("status", "pending"),
            ])
        }

        /// Update the status of a payment.
        pub fn update_status(&mut self, txn_id: &str, status: &str) -> Result<bool, String> {
            let logger = get_logger("database.queries.payment");
            logger.info(&format!("Updating payment {} to {}", txn_id, status));
            let result = self.db.execute_query(
                "UPDATE payments SET status = ? WHERE transaction_id = ?",
                &[status, txn_id],
            )?;
            Ok(result.affected > 0)
        }
    }
    """,
)

# ─── database/migrations.rs ───
w(
    "database/migrations.rs",
    """\
    use crate::utils::helpers::get_logger;
    use crate::database::connection::DatabaseConnection;

    /// A single database migration with version, name, and SQL.
    pub struct Migration {
        /// The migration version string.
        pub version: String,
        /// A human-readable name for the migration.
        pub name: String,
        /// The SQL to execute.
        pub sql: String,
    }

    /// Runs pending database migrations in order.
    pub struct MigrationRunner {
        /// The database connection to run migrations against.
        db: DatabaseConnection,
        /// All known migrations.
        migrations: Vec<Migration>,
    }

    impl MigrationRunner {
        /// Create a new migration runner with the given connection.
        pub fn new(db: DatabaseConnection) -> Self {
            let logger = get_logger("database.migrations");
            logger.info("MigrationRunner initialized");
            let migrations = vec![
                Migration {
                    version: "001".to_string(),
                    name: "create_users".to_string(),
                    sql: "CREATE TABLE users (id TEXT PRIMARY KEY, email TEXT)".to_string(),
                },
                Migration {
                    version: "002".to_string(),
                    name: "create_sessions".to_string(),
                    sql: "CREATE TABLE sessions (id TEXT PRIMARY KEY, user_id TEXT)".to_string(),
                },
                Migration {
                    version: "003".to_string(),
                    name: "create_payments".to_string(),
                    sql: "CREATE TABLE payments (id TEXT PRIMARY KEY, amount REAL)".to_string(),
                },
                Migration {
                    version: "004".to_string(),
                    name: "create_events".to_string(),
                    sql: "CREATE TABLE events (id TEXT PRIMARY KEY, type TEXT)".to_string(),
                },
                Migration {
                    version: "005".to_string(),
                    name: "create_notifications".to_string(),
                    sql: "CREATE TABLE notifications (id TEXT PRIMARY KEY, user_id TEXT)".to_string(),
                },
            ];
            Self { db, migrations }
        }

        /// Run all pending migrations, returning the count applied.
        pub fn run_pending(&mut self) -> Result<u32, String> {
            let logger = get_logger("database.migrations");
            let mut count = 0u32;
            for migration in &self.migrations {
                logger.info(&format!("Applying migration {}: {}", migration.version, migration.name));
                self.db.begin_transaction()?;
                match self.db.execute_query(&migration.sql, &[]) {
                    Ok(_) => {
                        self.db.commit()?;
                        count += 1;
                    }
                    Err(e) => {
                        self.db.rollback()?;
                        return Err(format!("Migration {} failed: {}", migration.version, e));
                    }
                }
            }
            logger.info(&format!("{} migrations applied", count));
            Ok(count)
        }

        /// Return migration status information.
        pub fn status(&self) -> (usize, usize) {
            let logger = get_logger("database.migrations");
            let total = self.migrations.len();
            logger.info(&format!("{} total migrations", total));
            (0, total)
        }
    }
    """,
)

# ─── services/mod.rs ───
w(
    "services/mod.rs",
    """\
    pub mod base;
    pub mod cacheable;
    pub mod auditable;
    pub mod auth_service;
    pub mod email;
    pub mod payment;
    pub mod notification;
    """,
)

# ─── services/base.rs ───
w(
    "services/base.rs",
    """\
    use crate::utils::helpers::get_logger;

    /// Core trait that all services must implement.
    pub trait Service {
        /// Initialize the service and prepare resources.
        fn initialize(&mut self) -> Result<(), String>;

        /// Shut down the service and release resources.
        fn shutdown(&mut self) -> Result<(), String>;

        /// Check the health of this service.
        fn health_check(&self) -> ServiceHealth;
    }

    /// Health status returned by a service.
    pub struct ServiceHealth {
        /// Name of the service.
        pub name: String,
        /// Whether the service is healthy.
        pub healthy: bool,
        /// Optional status message.
        pub message: Option<String>,
    }

    /// Base implementation of the Service trait.
    pub struct BaseServiceImpl {
        /// The name of this service.
        pub name: String,
        /// Whether this service has been initialized.
        initialized: bool,
    }

    impl BaseServiceImpl {
        /// Create a new base service with the given name.
        pub fn new(name: &str) -> Self {
            let logger = get_logger("services.base");
            logger.info(&format!("Creating service: {}", name));
            Self {
                name: name.to_string(),
                initialized: false,
            }
        }

        /// Check whether the service is initialized and return an error if not.
        pub fn require_initialized(&self) -> Result<(), String> {
            if !self.initialized {
                return Err(format!("{} not initialized", self.name));
            }
            Ok(())
        }
    }

    impl Service for BaseServiceImpl {
        /// Initialize the base service.
        fn initialize(&mut self) -> Result<(), String> {
            let logger = get_logger("services.base");
            self.initialized = true;
            logger.info(&format!("{} initialized", self.name));
            Ok(())
        }

        /// Shut down the base service.
        fn shutdown(&mut self) -> Result<(), String> {
            let logger = get_logger("services.base");
            self.initialized = false;
            logger.info(&format!("{} shut down", self.name));
            Ok(())
        }

        /// Return health status of the base service.
        fn health_check(&self) -> ServiceHealth {
            ServiceHealth {
                name: self.name.clone(),
                healthy: self.initialized,
                message: if self.initialized {
                    Some("OK".to_string())
                } else {
                    Some("Not initialized".to_string())
                },
            }
        }
    }
    """,
)

# ─── services/cacheable.rs ───
w(
    "services/cacheable.rs",
    """\
    use std::collections::HashMap;

    use crate::utils::helpers::get_logger;
    use crate::services::base::{Service, ServiceHealth, BaseServiceImpl};

    /// A service wrapper that adds in-memory caching capabilities.
    pub struct CacheableService {
        /// The underlying service implementation.
        inner: BaseServiceImpl,
        /// The in-memory cache store.
        cache: HashMap<String, String>,
        /// Default time-to-live in seconds for cache entries.
        default_ttl: u64,
    }

    impl CacheableService {
        /// Create a new cacheable service with the given name.
        pub fn new(name: &str) -> Self {
            let logger = get_logger("services.cacheable");
            logger.info(&format!("Creating CacheableService: {}", name));
            Self {
                inner: BaseServiceImpl::new(name),
                cache: HashMap::new(),
                default_ttl: 300,
            }
        }

        /// Retrieve a value from the cache by key.
        pub fn cache_get(&self, key: &str) -> Option<&String> {
            let logger = get_logger("services.cacheable");
            match self.cache.get(key) {
                Some(val) => {
                    logger.info(&format!("Cache hit: {}", key));
                    Some(val)
                }
                None => {
                    logger.info(&format!("Cache miss: {}", key));
                    None
                }
            }
        }

        /// Store a value in the cache with the given key.
        pub fn cache_set(&mut self, key: &str, value: &str) {
            let logger = get_logger("services.cacheable");
            self.cache.insert(key.to_string(), value.to_string());
            logger.info(&format!("Cache set: {} (ttl={}s)", key, self.default_ttl));
        }

        /// Remove all entries from the cache, returning the number removed.
        pub fn cache_clear(&mut self) -> usize {
            let logger = get_logger("services.cacheable");
            let count = self.cache.len();
            self.cache.clear();
            logger.info(&format!("Cache cleared: {} entries", count));
            count
        }
    }

    impl Service for CacheableService {
        /// Initialize the cacheable service.
        fn initialize(&mut self) -> Result<(), String> {
            self.inner.initialize()
        }

        /// Shut down the cacheable service and clear cache.
        fn shutdown(&mut self) -> Result<(), String> {
            self.cache.clear();
            self.inner.shutdown()
        }

        /// Return health status of the cacheable service.
        fn health_check(&self) -> ServiceHealth {
            self.inner.health_check()
        }
    }
    """,
)

# ─── services/auditable.rs ───
w(
    "services/auditable.rs",
    """\
    use crate::utils::helpers::get_logger;
    use crate::services::base::{Service, ServiceHealth, BaseServiceImpl};

    /// An entry in the audit trail.
    pub struct AuditEntry {
        /// The action that was performed.
        pub action: String,
        /// Who performed the action.
        pub actor: String,
        /// The resource affected.
        pub resource: String,
        /// Additional details about the action.
        pub details: String,
        /// Timestamp of the action.
        pub timestamp: u64,
    }

    /// Trait for services that support audit logging.
    pub trait Auditable {
        /// Record an audit entry for the given action.
        fn record_audit(&mut self, action: &str, actor: &str, resource: &str, details: &str);

        /// Retrieve the audit trail, optionally filtered by resource.
        fn get_audit_trail(&self, resource: Option<&str>, limit: usize) -> Vec<&AuditEntry>;
    }

    /// A service that automatically records an audit trail.
    pub struct AuditableService {
        /// The underlying service implementation.
        inner: BaseServiceImpl,
        /// The stored audit log entries.
        audit_log: Vec<AuditEntry>,
    }

    impl AuditableService {
        /// Create a new auditable service with the given name.
        pub fn new(name: &str) -> Self {
            let logger = get_logger("services.auditable");
            logger.info(&format!("Creating AuditableService: {}", name));
            Self {
                inner: BaseServiceImpl::new(name),
                audit_log: Vec::new(),
            }
        }
    }

    impl Auditable for AuditableService {
        /// Record an audit entry.
        fn record_audit(&mut self, action: &str, actor: &str, resource: &str, details: &str) {
            let logger = get_logger("services.auditable");
            logger.info(&format!("Audit: {} {} on {}", actor, action, resource));
            self.audit_log.push(AuditEntry {
                action: action.to_string(),
                actor: actor.to_string(),
                resource: resource.to_string(),
                details: details.to_string(),
                timestamp: 0,
            });
        }

        /// Get the audit trail, optionally filtered by resource.
        fn get_audit_trail(&self, resource: Option<&str>, limit: usize) -> Vec<&AuditEntry> {
            let logger = get_logger("services.auditable");
            logger.info(&format!("Getting audit trail, limit={}", limit));
            self.audit_log
                .iter()
                .filter(|e| resource.map_or(true, |r| e.resource == r))
                .rev()
                .take(limit)
                .collect()
        }
    }

    impl Service for AuditableService {
        /// Initialize the auditable service.
        fn initialize(&mut self) -> Result<(), String> {
            self.inner.initialize()
        }

        /// Shut down the auditable service.
        fn shutdown(&mut self) -> Result<(), String> {
            self.inner.shutdown()
        }

        /// Return health status of the auditable service.
        fn health_check(&self) -> ServiceHealth {
            self.inner.health_check()
        }
    }
    """,
)

# ─── services/auth_service.rs ───
w(
    "services/auth_service.rs",
    """\
    use crate::utils::helpers::{get_logger, sanitize_input};
    use crate::auth::service::{AuthProvider, DefaultAuth};
    use crate::auth::tokens::validate_token;
    use crate::config::Config;
    use crate::error::AppError;
    use crate::services::base::{Service, ServiceHealth, BaseServiceImpl};

    /// High-level authentication service that orchestrates login flows.
    pub struct AuthenticationService {
        /// The underlying service state.
        inner: BaseServiceImpl,
        /// The auth provider for credential validation.
        auth: DefaultAuth,
    }

    impl AuthenticationService {
        /// Create a new authentication service with the given config.
        pub fn new(config: Config) -> Self {
            let logger = get_logger("services.auth");
            logger.info("Creating AuthenticationService");
            Self {
                inner: BaseServiceImpl::new("authentication"),
                auth: DefaultAuth::new(config),
            }
        }

        /// Authenticate a user with email and password.
        pub fn authenticate(&self, email: &str, password: &str) -> Result<String, AppError> {
            let logger = get_logger("services.auth");
            self.inner.require_initialized()
                .map_err(|e| AppError::Internal(e))?;
            let clean_email = sanitize_input(email);
            logger.info(&format!("Authentication attempt for {}", clean_email));
            self.auth.login(&clean_email, password)
        }

        /// Verify a token and return the associated user information.
        pub fn verify_token(&self, token: &str) -> Result<String, AppError> {
            let logger = get_logger("services.auth");
            logger.info("Verifying token");
            let user = validate_token(token)
                .map_err(|e| AppError::Unauthorized(e.message))?;
            Ok(user.email.clone())
        }

        /// Log out a user by revoking their token.
        pub fn logout(&self, token: &str) -> Result<bool, AppError> {
            let logger = get_logger("services.auth");
            logger.info("Processing logout");
            self.auth.logout(token)
        }
    }

    impl Service for AuthenticationService {
        /// Initialize the authentication service.
        fn initialize(&mut self) -> Result<(), String> {
            self.inner.initialize()
        }

        /// Shut down the authentication service.
        fn shutdown(&mut self) -> Result<(), String> {
            self.inner.shutdown()
        }

        /// Return health status of the authentication service.
        fn health_check(&self) -> ServiceHealth {
            self.inner.health_check()
        }
    }
    """,
)

# ─── services/email/mod.rs ───
w(
    "services/email/mod.rs",
    """\
    pub mod sender;
    """,
)

# ─── services/email/sender.rs ───
w(
    "services/email/sender.rs",
    """\
    use crate::utils::helpers::{get_logger, sanitize_input, generate_request_id};
    use crate::services::base::{Service, ServiceHealth, BaseServiceImpl};

    /// An email message to be sent.
    pub struct EmailMessage {
        /// The recipient email address.
        pub to: String,
        /// The email subject.
        pub subject: String,
        /// The email body content.
        pub body: String,
        /// A unique message ID.
        pub message_id: String,
    }

    /// Sends emails using a configured SMTP-like backend.
    pub struct EmailSender {
        /// The underlying service state.
        inner: BaseServiceImpl,
        /// The sender email address.
        from_address: String,
        /// Number of emails sent in this session.
        sent_count: u64,
    }

    impl EmailSender {
        /// Create a new email sender with the given from address.
        pub fn new(from_address: &str) -> Self {
            let logger = get_logger("services.email");
            logger.info(&format!("Creating EmailSender from={}", from_address));
            Self {
                inner: BaseServiceImpl::new("email_sender"),
                from_address: from_address.to_string(),
                sent_count: 0,
            }
        }

        /// Send a plain-text email to the given recipient.
        pub fn send(&mut self, to: &str, subject: &str, body: &str) -> Result<EmailMessage, String> {
            let logger = get_logger("services.email");
            self.inner.require_initialized()?;
            let clean_subject = sanitize_input(subject);
            let clean_body = sanitize_input(body);
            let message_id = generate_request_id();
            logger.info(&format!("Sending email to={}, subject={}", to, clean_subject));
            self.sent_count += 1;
            Ok(EmailMessage {
                to: to.to_string(),
                subject: clean_subject,
                body: clean_body,
                message_id,
            })
        }

        /// Send an email using a named template with variables.
        pub fn send_template(
            &mut self,
            to: &str,
            template: &str,
            vars: &[(&str, &str)],
        ) -> Result<EmailMessage, String> {
            let logger = get_logger("services.email");
            self.inner.require_initialized()?;
            let mut body = template.to_string();
            for (key, value) in vars {
                body = body.replace(&format!("{{{{{}}}}}", key), value);
            }
            logger.info(&format!("Sending template email to={}", to));
            self.send(to, template, &body)
        }

        /// Return the total number of emails sent.
        pub fn stats(&self) -> u64 {
            self.sent_count
        }
    }

    impl Service for EmailSender {
        /// Initialize the email sender.
        fn initialize(&mut self) -> Result<(), String> {
            self.inner.initialize()
        }

        /// Shut down the email sender.
        fn shutdown(&mut self) -> Result<(), String> {
            self.inner.shutdown()
        }

        /// Return health status of the email sender.
        fn health_check(&self) -> ServiceHealth {
            self.inner.health_check()
        }
    }
    """,
)

# ─── services/payment/mod.rs ───
w(
    "services/payment/mod.rs",
    """\
    pub mod processor;
    pub mod gateway;
    """,
)

# ─── services/payment/processor.rs ───
w(
    "services/payment/processor.rs",
    """\
    use crate::utils::helpers::{get_logger, generate_request_id};
    use crate::services::base::{Service, ServiceHealth, BaseServiceImpl};
    use crate::services::payment::gateway::PaymentGateway;
    use crate::app_errors::AppErrorExt;

    /// Supported payment currencies.
    const SUPPORTED_CURRENCIES: &[&str] = &["USD", "EUR", "GBP", "JPY", "CAD"];

    /// The result of a payment processing operation.
    pub struct PaymentResult {
        /// The transaction ID.
        pub transaction_id: String,
        /// The status of the payment.
        pub status: String,
        /// The amount charged.
        pub amount: f64,
        /// The currency used.
        pub currency: String,
    }

    /// Processes payments using a gateway and manages payment lifecycle.
    pub struct PaymentProcessor {
        /// The underlying service state.
        inner: BaseServiceImpl,
        /// The payment gateway to use.
        gateway: PaymentGateway,
    }

    impl PaymentProcessor {
        /// Create a new payment processor with the given gateway.
        pub fn new(gateway: PaymentGateway) -> Self {
            let logger = get_logger("services.payment.processor");
            logger.info("Creating PaymentProcessor");
            Self {
                inner: BaseServiceImpl::new("payment_processor"),
                gateway,
            }
        }

        /// Process a payment for the given user.
        pub fn process_payment(
            &mut self,
            user_id: &str,
            amount: f64,
            currency: &str,
            source: &str,
        ) -> Result<PaymentResult, AppErrorExt> {
            let logger = get_logger("services.payment.processor");
            self.inner.require_initialized()
                .map_err(|e| AppErrorExt::Payment {
                    transaction_id: None,
                    message: e,
                })?;
            self.validate_payment(amount, currency)?;
            logger.info(&format!("Processing payment: user={}, amount={} {}", user_id, amount, currency));
            let txn_id = generate_request_id();
            let gateway_result = self.gateway.charge(amount, currency, source);
            if !gateway_result.success {
                return Err(AppErrorExt::Payment {
                    transaction_id: Some(txn_id),
                    message: gateway_result.message,
                });
            }
            logger.info(&format!("Payment completed: txn={}", txn_id));
            Ok(PaymentResult {
                transaction_id: txn_id,
                status: "completed".to_string(),
                amount,
                currency: currency.to_string(),
            })
        }

        /// Refund a previously completed payment.
        pub fn refund(&mut self, transaction_id: &str, reason: &str) -> Result<PaymentResult, AppErrorExt> {
            let logger = get_logger("services.payment.processor");
            logger.info(&format!("Refunding payment: txn={}, reason={}", transaction_id, reason));
            let gateway_result = self.gateway.refund_charge(transaction_id);
            if !gateway_result.success {
                return Err(AppErrorExt::Payment {
                    transaction_id: Some(transaction_id.to_string()),
                    message: gateway_result.message,
                });
            }
            Ok(PaymentResult {
                transaction_id: transaction_id.to_string(),
                status: "refunded".to_string(),
                amount: 0.0,
                currency: String::new(),
            })
        }

        /// Validate payment parameters before processing.
        fn validate_payment(&self, amount: f64, currency: &str) -> Result<(), AppErrorExt> {
            if !SUPPORTED_CURRENCIES.contains(&currency) {
                return Err(AppErrorExt::Validation {
                    field: "currency".to_string(),
                    message: format!("Unsupported currency: {}", currency),
                });
            }
            if amount <= 0.0 {
                return Err(AppErrorExt::Validation {
                    field: "amount".to_string(),
                    message: "Amount must be positive".to_string(),
                });
            }
            if amount > 999999.0 {
                return Err(AppErrorExt::Validation {
                    field: "amount".to_string(),
                    message: "Amount exceeds maximum".to_string(),
                });
            }
            Ok(())
        }
    }

    impl Service for PaymentProcessor {
        /// Initialize the payment processor.
        fn initialize(&mut self) -> Result<(), String> {
            self.inner.initialize()
        }

        /// Shut down the payment processor.
        fn shutdown(&mut self) -> Result<(), String> {
            self.inner.shutdown()
        }

        /// Return health status of the payment processor.
        fn health_check(&self) -> ServiceHealth {
            self.inner.health_check()
        }
    }
    """,
)

# ─── services/payment/gateway.rs ───
w(
    "services/payment/gateway.rs",
    """\
    use crate::utils::helpers::{get_logger, generate_request_id};

    /// The result of a gateway API call.
    pub struct GatewayResponse {
        /// Whether the operation succeeded.
        pub success: bool,
        /// The transaction ID assigned by the gateway.
        pub txn_id: String,
        /// A human-readable message.
        pub message: String,
    }

    /// A payment gateway client for charging and refunding.
    pub struct PaymentGateway {
        /// The API key for gateway authentication.
        api_key: String,
        /// The environment (sandbox or production).
        environment: String,
        /// Total number of API requests made.
        request_count: u64,
    }

    impl PaymentGateway {
        /// Create a new payment gateway client.
        pub fn new(api_key: &str, environment: &str) -> Self {
            let logger = get_logger("services.payment.gateway");
            logger.info(&format!("Gateway initialized: env={}", environment));
            Self {
                api_key: api_key.to_string(),
                environment: environment.to_string(),
                request_count: 0,
            }
        }

        /// Charge a payment source for the given amount.
        pub fn charge(&mut self, amount: f64, currency: &str, source: &str) -> GatewayResponse {
            let logger = get_logger("services.payment.gateway");
            logger.info(&format!("Charging {} {} from {}", amount, currency, source));
            self.request_count += 1;
            let txn_id = generate_request_id();
            if amount > 10000.0 {
                return GatewayResponse {
                    success: false,
                    txn_id,
                    message: "Amount exceeds gateway limit".to_string(),
                };
            }
            GatewayResponse {
                success: true,
                txn_id,
                message: "Charge successful".to_string(),
            }
        }

        /// Refund a previously created charge.
        pub fn refund_charge(&mut self, charge_id: &str) -> GatewayResponse {
            let logger = get_logger("services.payment.gateway");
            logger.info(&format!("Refunding charge {}", charge_id));
            self.request_count += 1;
            GatewayResponse {
                success: true,
                txn_id: generate_request_id(),
                message: "Refund successful".to_string(),
            }
        }

        /// Return gateway statistics.
        pub fn stats(&self) -> u64 {
            self.request_count
        }
    }
    """,
)

# ─── services/notification/mod.rs ───
w(
    "services/notification/mod.rs",
    """\
    pub mod manager;
    """,
)

# ─── services/notification/manager.rs ───
w(
    "services/notification/manager.rs",
    """\
    use crate::utils::helpers::{get_logger, sanitize_input};
    use crate::services::base::{Service, ServiceHealth, BaseServiceImpl};

    /// A notification to be delivered to a user.
    pub struct Notification {
        /// The target user ID.
        pub user_id: String,
        /// The delivery channel (email, sms, push, in_app).
        pub channel: String,
        /// The notification subject.
        pub subject: String,
        /// The notification body.
        pub body: String,
        /// Current delivery status.
        pub status: String,
    }

    /// Valid notification channels.
    const VALID_CHANNELS: &[&str] = &["email", "sms", "push", "in_app"];

    /// Manages notification creation and delivery.
    pub struct NotificationManager {
        /// The underlying service state.
        inner: BaseServiceImpl,
        /// Queue of pending notifications.
        queue: Vec<Notification>,
    }

    impl NotificationManager {
        /// Create a new notification manager.
        pub fn new() -> Self {
            let logger = get_logger("services.notification");
            logger.info("Creating NotificationManager");
            Self {
                inner: BaseServiceImpl::new("notification_manager"),
                queue: Vec::new(),
            }
        }

        /// Queue a notification for delivery.
        pub fn send(
            &mut self,
            user_id: &str,
            channel: &str,
            subject: &str,
            body: &str,
        ) -> Result<&Notification, String> {
            let logger = get_logger("services.notification");
            self.inner.require_initialized()?;
            if !VALID_CHANNELS.contains(&channel) {
                return Err(format!("Invalid channel: {}", channel));
            }
            logger.info(&format!("Queuing notification for {} via {}", user_id, channel));
            self.queue.push(Notification {
                user_id: user_id.to_string(),
                channel: channel.to_string(),
                subject: sanitize_input(subject),
                body: sanitize_input(body),
                status: "pending".to_string(),
            });
            Ok(self.queue.last().unwrap())
        }

        /// Process all pending notifications in the queue.
        pub fn process_queue(&mut self) -> (usize, usize) {
            let logger = get_logger("services.notification");
            logger.info(&format!("Processing {} notifications", self.queue.len()));
            let mut sent = 0usize;
            let mut failed = 0usize;
            for notification in &mut self.queue {
                if notification.status == "pending" {
                    notification.status = "sent".to_string();
                    sent += 1;
                }
            }
            self.queue.retain(|n| n.status == "pending");
            (sent, failed)
        }
    }

    impl Service for NotificationManager {
        /// Initialize the notification manager.
        fn initialize(&mut self) -> Result<(), String> {
            self.inner.initialize()
        }

        /// Shut down the notification manager.
        fn shutdown(&mut self) -> Result<(), String> {
            self.queue.clear();
            self.inner.shutdown()
        }

        /// Return health status of the notification manager.
        fn health_check(&self) -> ServiceHealth {
            self.inner.health_check()
        }
    }
    """,
)

# ─── cache/mod.rs ───
w(
    "cache/mod.rs",
    """\
    pub mod redis;
    pub mod memory;

    /// Trait defining the interface for all cache implementations.
    pub trait Cache {
        /// Retrieve a value by key from the cache.
        fn get(&self, key: &str) -> Option<String>;

        /// Store a key-value pair in the cache with optional TTL.
        fn set(&mut self, key: &str, value: &str, ttl_secs: Option<u64>);

        /// Delete a key from the cache, returning true if it existed.
        fn delete(&mut self, key: &str) -> bool;

        /// Clear all entries from the cache.
        fn clear(&mut self) -> usize;
    }
    """,
)

# ─── cache/redis.rs ───
w(
    "cache/redis.rs",
    """\
    use std::collections::HashMap;
    use crate::utils::helpers::get_logger;
    use crate::cache::Cache;

    /// A simulated Redis-backed cache implementation.
    pub struct RedisCache {
        /// The Redis connection URL.
        url: String,
        /// In-memory store simulating Redis.
        store: HashMap<String, String>,
        /// Whether the cache is connected.
        connected: bool,
    }

    impl RedisCache {
        /// Create a new Redis cache with the given connection URL.
        pub fn new(url: &str) -> Self {
            let logger = get_logger("cache.redis");
            logger.info(&format!("Creating RedisCache: url={}", url));
            Self {
                url: url.to_string(),
                store: HashMap::new(),
                connected: false,
            }
        }

        /// Connect to the Redis server.
        pub fn connect(&mut self) -> Result<(), String> {
            let logger = get_logger("cache.redis");
            self.connected = true;
            logger.info("Connected to Redis");
            Ok(())
        }

        /// Disconnect from the Redis server.
        pub fn disconnect(&mut self) {
            let logger = get_logger("cache.redis");
            self.connected = false;
            logger.info("Disconnected from Redis");
        }

        /// Check if connected to Redis.
        pub fn is_connected(&self) -> bool {
            self.connected
        }
    }

    impl Cache for RedisCache {
        /// Get a value from Redis by key.
        fn get(&self, key: &str) -> Option<String> {
            let logger = get_logger("cache.redis");
            let result = self.store.get(key).cloned();
            if result.is_some() {
                logger.info(&format!("Redis GET hit: {}", key));
            } else {
                logger.info(&format!("Redis GET miss: {}", key));
            }
            result
        }

        /// Set a value in Redis.
        fn set(&mut self, key: &str, value: &str, _ttl_secs: Option<u64>) {
            let logger = get_logger("cache.redis");
            self.store.insert(key.to_string(), value.to_string());
            logger.info(&format!("Redis SET: {}", key));
        }

        /// Delete a key from Redis.
        fn delete(&mut self, key: &str) -> bool {
            let logger = get_logger("cache.redis");
            let existed = self.store.remove(key).is_some();
            logger.info(&format!("Redis DEL: {} (existed={})", key, existed));
            existed
        }

        /// Clear all keys from Redis.
        fn clear(&mut self) -> usize {
            let logger = get_logger("cache.redis");
            let count = self.store.len();
            self.store.clear();
            logger.info(&format!("Redis FLUSHALL: {} keys", count));
            count
        }
    }
    """,
)

# ─── cache/memory.rs ───
w(
    "cache/memory.rs",
    """\
    use std::collections::HashMap;
    use crate::utils::helpers::get_logger;
    use crate::cache::Cache;

    /// An in-memory cache implementation using a HashMap.
    pub struct MemoryCache {
        /// The in-memory key-value store.
        store: HashMap<String, String>,
        /// Maximum number of entries before eviction.
        max_size: usize,
    }

    impl MemoryCache {
        /// Create a new in-memory cache with the given max size.
        pub fn new(max_size: usize) -> Self {
            let logger = get_logger("cache.memory");
            logger.info(&format!("Creating MemoryCache: max_size={}", max_size));
            Self {
                store: HashMap::new(),
                max_size,
            }
        }

        /// Return the current number of entries in the cache.
        pub fn size(&self) -> usize {
            self.store.len()
        }

        /// Check if the cache is at capacity.
        pub fn is_full(&self) -> bool {
            self.store.len() >= self.max_size
        }
    }

    impl Cache for MemoryCache {
        /// Get a value from the memory cache.
        fn get(&self, key: &str) -> Option<String> {
            let logger = get_logger("cache.memory");
            let result = self.store.get(key).cloned();
            if result.is_some() {
                logger.info(&format!("Memory GET hit: {}", key));
            } else {
                logger.info(&format!("Memory GET miss: {}", key));
            }
            result
        }

        /// Set a value in the memory cache.
        fn set(&mut self, key: &str, value: &str, _ttl_secs: Option<u64>) {
            let logger = get_logger("cache.memory");
            if self.store.len() >= self.max_size && !self.store.contains_key(key) {
                logger.warn("Memory cache at capacity, evicting oldest");
                if let Some(first_key) = self.store.keys().next().cloned() {
                    self.store.remove(&first_key);
                }
            }
            self.store.insert(key.to_string(), value.to_string());
            logger.info(&format!("Memory SET: {}", key));
        }

        /// Delete a key from the memory cache.
        fn delete(&mut self, key: &str) -> bool {
            let logger = get_logger("cache.memory");
            let existed = self.store.remove(key).is_some();
            logger.info(&format!("Memory DEL: {} (existed={})", key, existed));
            existed
        }

        /// Clear all entries from the memory cache.
        fn clear(&mut self) -> usize {
            let logger = get_logger("cache.memory");
            let count = self.store.len();
            self.store.clear();
            logger.info(&format!("Memory CLEAR: {} entries", count));
            count
        }
    }
    """,
)

# ─── validators/mod.rs ───
w(
    "validators/mod.rs",
    """\
    pub mod common;
    pub mod user;
    pub mod payment;
    """,
)

# ─── validators/common.rs ───
w(
    "validators/common.rs",
    """\
    use crate::utils::helpers::get_logger;

    /// Validate that a string is not empty.
    pub fn validate_not_empty(field: &str, value: &str) -> Result<(), String> {
        let logger = get_logger("validators.common");
        if value.trim().is_empty() {
            logger.warn(&format!("Validation failed: {} is empty", field));
            return Err(format!("{} cannot be empty", field));
        }
        Ok(())
    }

    /// Validate that a string does not exceed the maximum length.
    pub fn validate_max_length(field: &str, value: &str, max: usize) -> Result<(), String> {
        let logger = get_logger("validators.common");
        if value.len() > max {
            logger.warn(&format!("Validation failed: {} exceeds max length {}", field, max));
            return Err(format!("{} exceeds maximum length of {}", field, max));
        }
        Ok(())
    }

    /// Validate that a string has at least the minimum length.
    pub fn validate_min_length(field: &str, value: &str, min: usize) -> Result<(), String> {
        let logger = get_logger("validators.common");
        if value.len() < min {
            logger.warn(&format!("Validation failed: {} below min length {}", field, min));
            return Err(format!("{} must be at least {} characters", field, min));
        }
        Ok(())
    }

    /// Validate that a value is a valid email format (simple check).
    pub fn validate_email_format(email: &str) -> Result<(), String> {
        let logger = get_logger("validators.common");
        if !email.contains('@') || !email.contains('.') {
            logger.warn(&format!("Invalid email format: {}", email));
            return Err("Invalid email format".to_string());
        }
        Ok(())
    }

    /// Validate that a numeric value is within the given range.
    pub fn validate_range(field: &str, value: f64, min: f64, max: f64) -> Result<(), String> {
        let logger = get_logger("validators.common");
        if value < min || value > max {
            logger.warn(&format!("Validation failed: {} out of range [{}, {}]", field, min, max));
            return Err(format!("{} must be between {} and {}", field, min, max));
        }
        Ok(())
    }
    """,
)

# ─── validators/user.rs ───
w(
    "validators/user.rs",
    """\
    use crate::utils::helpers::get_logger;
    use crate::validators::common::{
        validate_email_format, validate_max_length, validate_min_length, validate_not_empty,
    };

    /// Validate user registration input fields.
    pub fn validate(email: &str, name: &str, password: &str) -> Result<(), Vec<String>> {
        let logger = get_logger("validators.user");
        logger.info(&format!("Validating user registration: {}", email));
        let mut errors = Vec::new();
        if let Err(e) = validate_not_empty("email", email) {
            errors.push(e);
        }
        if let Err(e) = validate_email_format(email) {
            errors.push(e);
        }
        if let Err(e) = validate_not_empty("name", name) {
            errors.push(e);
        }
        if let Err(e) = validate_max_length("name", name, 100) {
            errors.push(e);
        }
        if let Err(e) = validate_min_length("password", password, 8) {
            errors.push(e);
        }
        if let Err(e) = validate_max_length("password", password, 128) {
            errors.push(e);
        }
        if errors.is_empty() {
            logger.info("User validation passed");
            Ok(())
        } else {
            logger.warn(&format!("User validation failed: {} errors", errors.len()));
            Err(errors)
        }
    }

    /// Validate user profile update fields.
    pub fn validate_update(name: &str, email: &str) -> Result<(), Vec<String>> {
        let logger = get_logger("validators.user");
        logger.info("Validating user update");
        let mut errors = Vec::new();
        if let Err(e) = validate_not_empty("name", name) {
            errors.push(e);
        }
        if let Err(e) = validate_email_format(email) {
            errors.push(e);
        }
        if errors.is_empty() {
            Ok(())
        } else {
            Err(errors)
        }
    }
    """,
)

# ─── validators/payment.rs ───
w(
    "validators/payment.rs",
    """\
    use crate::utils::helpers::get_logger;
    use crate::validators::common::{validate_not_empty, validate_range};

    /// Supported payment currencies.
    const SUPPORTED_CURRENCIES: &[&str] = &["USD", "EUR", "GBP", "JPY", "CAD"];

    /// Validate payment request parameters.
    pub fn validate(amount: f64, currency: &str, source: &str) -> Result<(), Vec<String>> {
        let logger = get_logger("validators.payment");
        logger.info(&format!("Validating payment: {} {} from {}", amount, currency, source));
        let mut errors = Vec::new();
        if let Err(e) = validate_range("amount", amount, 0.01, 999999.0) {
            errors.push(e);
        }
        if !SUPPORTED_CURRENCIES.contains(&currency) {
            errors.push(format!("Unsupported currency: {}", currency));
        }
        if let Err(e) = validate_not_empty("source", source) {
            errors.push(e);
        }
        if errors.is_empty() {
            logger.info("Payment validation passed");
            Ok(())
        } else {
            logger.warn(&format!("Payment validation failed: {} errors", errors.len()));
            Err(errors)
        }
    }

    /// Validate refund request parameters.
    pub fn validate_refund(transaction_id: &str, reason: &str) -> Result<(), Vec<String>> {
        let logger = get_logger("validators.payment");
        logger.info(&format!("Validating refund for txn: {}", transaction_id));
        let mut errors = Vec::new();
        if let Err(e) = validate_not_empty("transaction_id", transaction_id) {
            errors.push(e);
        }
        if let Err(e) = validate_not_empty("reason", reason) {
            errors.push(e);
        }
        if errors.is_empty() {
            Ok(())
        } else {
            Err(errors)
        }
    }
    """,
)

# ─── middleware/mod.rs ───
w(
    "middleware/mod.rs",
    """\
    pub mod auth_mw;
    pub mod rate_limit;
    pub mod cors;
    pub mod logging_mw;
    """,
)

# ─── middleware/auth_mw.rs ───
w(
    "middleware/auth_mw.rs",
    """\
    use crate::utils::helpers::get_logger;
    use crate::auth::middleware::{auth_middleware, extract_token};
    use crate::error::AppError;
    use crate::Request;

    /// Paths that do not require authentication.
    const PUBLIC_PATHS: &[&str] = &["/health", "/login", "/register", "/docs"];

    /// Check if a request path is public (no auth required).
    pub fn is_public_path(path: &str) -> bool {
        let logger = get_logger("middleware.auth");
        let is_public = PUBLIC_PATHS.contains(&path);
        logger.info(&format!("Path {} is public: {}", path, is_public));
        is_public
    }

    /// Enforce authentication on a request unless the path is public.
    pub fn require_auth(request: &Request) -> Result<(), AppError> {
        let logger = get_logger("middleware.auth");
        if is_public_path(&request.path) {
            logger.info("Skipping auth for public path");
            return Ok(());
        }
        let _user = auth_middleware(request)?;
        logger.info("Authentication successful");
        Ok(())
    }

    /// Enforce admin role on a request.
    pub fn require_admin(request: &Request) -> Result<(), AppError> {
        let logger = get_logger("middleware.auth");
        logger.info("Checking admin authorization");
        let user = auth_middleware(request)?;
        if !user.is_admin {
            return Err(AppError::Forbidden("Admin access required".to_string()));
        }
        Ok(())
    }
    """,
)

# ─── middleware/rate_limit.rs ───
w(
    "middleware/rate_limit.rs",
    """\
    use std::collections::HashMap;
    use crate::utils::helpers::get_logger;
    use crate::app_errors::AppErrorExt;

    /// A sliding-window rate limiter tracking request counts per key.
    pub struct RateLimiter {
        /// Maximum requests allowed in the window.
        max_requests: u64,
        /// Window size in seconds.
        window_secs: u64,
        /// Request counts per client key.
        counts: HashMap<String, u64>,
    }

    impl RateLimiter {
        /// Create a new rate limiter with the given limits.
        pub fn new(max_requests: u64, window_secs: u64) -> Self {
            let logger = get_logger("middleware.rate_limit");
            logger.info(&format!("RateLimiter: max={}, window={}s", max_requests, window_secs));
            Self {
                max_requests,
                window_secs,
                counts: HashMap::new(),
            }
        }

        /// Check if a request from the given key should be allowed.
        pub fn check(&mut self, key: &str) -> Result<(), AppErrorExt> {
            let logger = get_logger("middleware.rate_limit");
            let count = self.counts.entry(key.to_string()).or_insert(0);
            *count += 1;
            if *count > self.max_requests {
                logger.warn(&format!("Rate limit exceeded for {}", key));
                return Err(AppErrorExt::RateLimit {
                    retry_after: self.window_secs,
                });
            }
            logger.info(&format!("Rate limit OK for {}: {}/{}", key, count, self.max_requests));
            Ok(())
        }

        /// Reset the counter for a specific key.
        pub fn reset(&mut self, key: &str) {
            let logger = get_logger("middleware.rate_limit");
            self.counts.remove(key);
            logger.info(&format!("Rate limit reset for {}", key));
        }

        /// Reset all counters.
        pub fn reset_all(&mut self) {
            let logger = get_logger("middleware.rate_limit");
            let count = self.counts.len();
            self.counts.clear();
            logger.info(&format!("All rate limits reset: {} keys", count));
        }
    }
    """,
)

# ─── middleware/cors.rs ───
w(
    "middleware/cors.rs",
    """\
    use crate::utils::helpers::get_logger;
    use crate::Response;

    /// Allowed origins for CORS requests.
    const ALLOWED_ORIGINS: &[&str] = &["http://localhost:3000", "https://app.example.com"];

    /// Allowed HTTP methods for CORS.
    const ALLOWED_METHODS: &[&str] = &["GET", "POST", "PUT", "DELETE", "OPTIONS"];

    /// Check if an origin is allowed by the CORS policy.
    pub fn is_origin_allowed(origin: &str) -> bool {
        let logger = get_logger("middleware.cors");
        let allowed = ALLOWED_ORIGINS.contains(&origin);
        logger.info(&format!("CORS origin check: {} = {}", origin, allowed));
        allowed
    }

    /// Add CORS headers to a response for the given origin.
    pub fn add_cors_headers(response: &mut Response, origin: &str) {
        let logger = get_logger("middleware.cors");
        if is_origin_allowed(origin) {
            logger.info(&format!("Adding CORS headers for origin: {}", origin));
        } else {
            logger.warn(&format!("Rejected CORS origin: {}", origin));
        }
    }

    /// Handle a CORS preflight OPTIONS request.
    pub fn handle_preflight(origin: &str) -> Response {
        let logger = get_logger("middleware.cors");
        logger.info(&format!("Handling CORS preflight for: {}", origin));
        if is_origin_allowed(origin) {
            Response::ok("OK".to_string())
        } else {
            Response::error(403, "Origin not allowed")
        }
    }
    """,
)

# ─── middleware/logging_mw.rs ───
w(
    "middleware/logging_mw.rs",
    """\
    use crate::utils::helpers::{get_logger, generate_request_id};
    use crate::Request;
    use crate::Response;

    /// Log an incoming request with method, path, and generated request ID.
    pub fn log_request(request: &Request) -> String {
        let logger = get_logger("middleware.logging");
        let request_id = generate_request_id();
        logger.info(&format!(
            "[{}] {} {}",
            request_id,
            "GET",
            request.path,
        ));
        request_id
    }

    /// Log an outgoing response with status and request ID.
    pub fn log_response(request_id: &str, response: &Response) {
        let logger = get_logger("middleware.logging");
        logger.info(&format!(
            "[{}] Response: status={}",
            request_id,
            response.status,
        ));
    }

    /// Log an error that occurred during request processing.
    pub fn log_error(request_id: &str, error: &str) {
        let logger = get_logger("middleware.logging");
        logger.error(&format!("[{}] Error: {}", request_id, error));
    }

    /// Middleware that wraps a handler with request/response logging.
    pub fn with_logging(
        request: &Request,
        handler: fn(&Request) -> Response,
    ) -> Response {
        let logger = get_logger("middleware.logging");
        let request_id = log_request(request);
        logger.info(&format!("[{}] Processing request", request_id));
        let response = handler(request);
        log_response(&request_id, &response);
        response
    }
    """,
)

# ─── api/mod.rs ───
w(
    "api/mod.rs",
    """\
    pub mod v1;
    pub mod v2;
    """,
)

# ─── api/v1/mod.rs ───
w(
    "api/v1/mod.rs",
    """\
    pub mod auth;
    pub mod payments;
    """,
)

# ─── api/v1/auth.rs ───
w(
    "api/v1/auth.rs",
    """\
    use crate::utils::helpers::{get_logger, sanitize_input, validate_request};
    use crate::auth::service::{AuthProvider, DefaultAuth};
    use crate::auth::tokens::{refresh_token, validate_token};
    use crate::auth::middleware::extract_token;
    use crate::config::Config;
    use crate::Request;
    use crate::Response;

    /// Validate an API v1 auth request has required fields.
    pub fn validate(request: &Request) -> Result<(), String> {
        let logger = get_logger("api.v1.auth");
        logger.info("Validating v1 auth request");
        validate_request(&request.path, "POST")
    }

    /// Handle login requests in the v1 API.
    pub fn handle_login(request: &Request) -> Response {
        let logger = get_logger("api.v1.auth");
        if let Err(e) = validate(request) {
            return Response::error(400, &e);
        }
        let config = Config::load();
        let auth = DefaultAuth::new(config);
        let email = sanitize_input("user@example.com");
        let password = "password";
        logger.info(&format!("V1 login attempt for {}", email));
        match auth.login(&email, password) {
            Ok(token) => Response::ok(format!("{{\"token\": \"{}\", \"version\": \"v1\"}}", token)),
            Err(e) => Response::error(401, &format!("{}", e)),
        }
    }

    /// Handle logout requests in the v1 API.
    pub fn handle_logout(request: &Request) -> Response {
        let logger = get_logger("api.v1.auth");
        logger.info("V1 logout");
        let config = Config::load();
        let auth = DefaultAuth::new(config);
        match extract_token(request) {
            Some(token) => match auth.logout(&token) {
                Ok(_) => Response::ok("Logged out".to_string()),
                Err(e) => Response::error(500, &format!("{}", e)),
            },
            None => Response::error(401, "Missing token"),
        }
    }

    /// Handle token refresh requests in the v1 API.
    pub fn handle_refresh(request: &Request) -> Response {
        let logger = get_logger("api.v1.auth");
        logger.info("V1 token refresh");
        let config = Config::load();
        match extract_token(request) {
            Some(token) => match refresh_token(&token, &config) {
                Ok(new_token) => Response::ok(format!("{{\"token\": \"{}\"}}", new_token.value)),
                Err(e) => Response::error(401, &e.message),
            },
            None => Response::error(401, "Missing token"),
        }
    }
    """,
)

# ─── api/v1/payments.rs ───
w(
    "api/v1/payments.rs",
    """\
    use crate::utils::helpers::{get_logger, generate_request_id};
    use crate::validators::payment;
    use crate::middleware::auth_mw::require_auth;
    use crate::Request;
    use crate::Response;

    /// Handle payment creation in the v1 API.
    pub fn handle_create_payment(request: &Request) -> Response {
        let logger = get_logger("api.v1.payments");
        if let Err(e) = require_auth(request) {
            return Response::error(401, &format!("{}", e));
        }
        logger.info("V1 create payment");
        let amount = 99.99;
        let currency = "USD";
        let source = "card_xxx";
        match payment::validate(amount, currency, source) {
            Ok(()) => {
                let txn_id = generate_request_id();
                logger.info(&format!("Payment created: txn={}", txn_id));
                Response::ok(format!("{{\"transaction_id\": \"{}\", \"status\": \"completed\"}}", txn_id))
            }
            Err(errors) => {
                Response::error(400, &format!("Validation errors: {:?}", errors))
            }
        }
    }

    /// Handle payment refund in the v1 API.
    pub fn handle_refund(request: &Request) -> Response {
        let logger = get_logger("api.v1.payments");
        if let Err(e) = require_auth(request) {
            return Response::error(401, &format!("{}", e));
        }
        logger.info("V1 refund payment");
        let txn_id = "txn-12345";
        match payment::validate_refund(txn_id, "customer request") {
            Ok(()) => {
                logger.info(&format!("Refund processed: txn={}", txn_id));
                Response::ok(format!("{{\"transaction_id\": \"{}\", \"status\": \"refunded\"}}", txn_id))
            }
            Err(errors) => {
                Response::error(400, &format!("Validation errors: {:?}", errors))
            }
        }
    }

    /// List payments for the authenticated user.
    pub fn handle_list_payments(request: &Request) -> Response {
        let logger = get_logger("api.v1.payments");
        if let Err(e) = require_auth(request) {
            return Response::error(401, &format!("{}", e));
        }
        logger.info("V1 list payments");
        Response::ok("[]".to_string())
    }
    """,
)

# ─── api/v2/mod.rs ───
w(
    "api/v2/mod.rs",
    """\
    pub mod auth;
    pub mod payments;
    """,
)

# ─── api/v2/auth.rs ───
w(
    "api/v2/auth.rs",
    """\
    use crate::utils::helpers::{get_logger, sanitize_input, validate_request};
    use crate::auth::service::{AuthProvider, DefaultAuth};
    use crate::auth::tokens::{refresh_token, validate_token};
    use crate::auth::middleware::extract_token;
    use crate::config::Config;
    use crate::Request;
    use crate::Response;

    /// Validate an API v2 auth request with enhanced checks.
    pub fn validate(request: &Request) -> Result<(), String> {
        let logger = get_logger("api.v2.auth");
        logger.info("Validating v2 auth request");
        validate_request(&request.path, "POST")?;
        if request.body.is_none() {
            return Err("V2 auth requires a request body".to_string());
        }
        Ok(())
    }

    /// Handle login requests in the v2 API with enhanced response.
    pub fn handle_login(request: &Request) -> Response {
        let logger = get_logger("api.v2.auth");
        if let Err(e) = validate(request) {
            return Response::error(400, &e);
        }
        let config = Config::load();
        let auth = DefaultAuth::new(config);
        let email = sanitize_input("user@example.com");
        let password = "password";
        logger.info(&format!("V2 login attempt for {}", email));
        match auth.login(&email, password) {
            Ok(token) => {
                Response::ok(format!(
                    "{{\"token\": \"{}\", \"version\": \"v2\", \"expires_in\": 3600}}",
                    token
                ))
            }
            Err(e) => Response::error(401, &format!("{}", e)),
        }
    }

    /// Handle logout requests in the v2 API.
    pub fn handle_logout(request: &Request) -> Response {
        let logger = get_logger("api.v2.auth");
        logger.info("V2 logout");
        let config = Config::load();
        let auth = DefaultAuth::new(config);
        match extract_token(request) {
            Some(token) => match auth.logout(&token) {
                Ok(_) => Response::ok("{{\"status\": \"logged_out\"}}".to_string()),
                Err(e) => Response::error(500, &format!("{}", e)),
            },
            None => Response::error(401, "Missing token"),
        }
    }

    /// Handle token refresh requests in the v2 API.
    pub fn handle_refresh(request: &Request) -> Response {
        let logger = get_logger("api.v2.auth");
        logger.info("V2 token refresh");
        let config = Config::load();
        match extract_token(request) {
            Some(token) => match refresh_token(&token, &config) {
                Ok(new_token) => {
                    Response::ok(format!(
                        "{{\"token\": \"{}\", \"expires_in\": 3600}}",
                        new_token.value
                    ))
                }
                Err(e) => Response::error(401, &e.message),
            },
            None => Response::error(401, "Missing token"),
        }
    }
    """,
)

# ─── api/v2/payments.rs ───
w(
    "api/v2/payments.rs",
    """\
    use crate::utils::helpers::{get_logger, generate_request_id};
    use crate::validators::payment;
    use crate::middleware::auth_mw::require_auth;
    use crate::Request;
    use crate::Response;

    /// Handle payment creation in the v2 API with enhanced validation.
    pub fn handle_create_payment(request: &Request) -> Response {
        let logger = get_logger("api.v2.payments");
        if let Err(e) = require_auth(request) {
            return Response::error(401, &format!("{}", e));
        }
        logger.info("V2 create payment");
        let amount = 149.99;
        let currency = "EUR";
        let source = "card_yyy";
        match payment::validate(amount, currency, source) {
            Ok(()) => {
                let txn_id = generate_request_id();
                logger.info(&format!("V2 payment created: txn={}", txn_id));
                Response::ok(format!(
                    "{{\"transaction_id\": \"{}\", \"status\": \"completed\", \"version\": \"v2\"}}",
                    txn_id
                ))
            }
            Err(errors) => {
                Response::error(400, &format!("Validation errors: {:?}", errors))
            }
        }
    }

    /// Handle payment refund in the v2 API.
    pub fn handle_refund(request: &Request) -> Response {
        let logger = get_logger("api.v2.payments");
        if let Err(e) = require_auth(request) {
            return Response::error(401, &format!("{}", e));
        }
        logger.info("V2 refund payment");
        let txn_id = "txn-67890";
        match payment::validate_refund(txn_id, "v2 customer request") {
            Ok(()) => {
                logger.info(&format!("V2 refund processed: txn={}", txn_id));
                Response::ok(format!(
                    "{{\"transaction_id\": \"{}\", \"status\": \"refunded\", \"version\": \"v2\"}}",
                    txn_id
                ))
            }
            Err(errors) => {
                Response::error(400, &format!("Validation errors: {:?}", errors))
            }
        }
    }

    /// List payments in the v2 API with pagination support.
    pub fn handle_list_payments(request: &Request) -> Response {
        let logger = get_logger("api.v2.payments");
        if let Err(e) = require_auth(request) {
            return Response::error(401, &format!("{}", e));
        }
        logger.info("V2 list payments");
        Response::ok("{{\"payments\": [], \"page\": 1, \"total\": 0}}".to_string())
    }
    """,
)

# ─── events/mod.rs ───
w(
    "events/mod.rs",
    """\
    pub mod dispatcher;
    pub mod handlers;
    """,
)

# ─── events/dispatcher.rs ───
w(
    "events/dispatcher.rs",
    """\
    use std::collections::HashMap;
    use crate::utils::helpers::get_logger;

    /// An event that can be dispatched through the system.
    pub struct Event {
        /// The event type identifier.
        pub event_type: String,
        /// The event payload as a string.
        pub payload: String,
        /// Timestamp of when the event was created.
        pub timestamp: u64,
    }

    /// A callback type for event handlers.
    pub type EventHandler = fn(&Event);

    /// Dispatches events to registered handlers.
    pub struct EventDispatcher {
        /// Map of event type to list of handlers.
        handlers: HashMap<String, Vec<EventHandler>>,
        /// Total number of events dispatched.
        dispatch_count: u64,
    }

    impl EventDispatcher {
        /// Create a new event dispatcher.
        pub fn new() -> Self {
            let logger = get_logger("events.dispatcher");
            logger.info("Creating EventDispatcher");
            Self {
                handlers: HashMap::new(),
                dispatch_count: 0,
            }
        }

        /// Emit an event to all registered handlers.
        pub fn emit(&mut self, event_type: &str, payload: &str) {
            let logger = get_logger("events.dispatcher");
            let event = Event {
                event_type: event_type.to_string(),
                payload: payload.to_string(),
                timestamp: 0,
            };
            self.dispatch_count += 1;
            logger.info(&format!("Emitting event: {} (total: {})", event_type, self.dispatch_count));
            if let Some(handler_list) = self.handlers.get(event_type) {
                for handler in handler_list {
                    handler(&event);
                }
            }
        }

        /// Register a handler for a specific event type.
        pub fn on(&mut self, event_type: &str, handler: EventHandler) {
            let logger = get_logger("events.dispatcher");
            logger.info(&format!("Registering handler for: {}", event_type));
            self.handlers
                .entry(event_type.to_string())
                .or_insert_with(Vec::new)
                .push(handler);
        }

        /// Remove all handlers for a given event type.
        pub fn off(&mut self, event_type: &str) {
            let logger = get_logger("events.dispatcher");
            self.handlers.remove(event_type);
            logger.info(&format!("Removed all handlers for: {}", event_type));
        }

        /// Return the total number of events dispatched.
        pub fn stats(&self) -> u64 {
            self.dispatch_count
        }
    }
    """,
)

# ─── events/handlers.rs ───
w(
    "events/handlers.rs",
    """\
    use crate::utils::helpers::get_logger;
    use crate::events::dispatcher::Event;

    /// Handle a user registration event.
    pub fn on_user_registered(event: &Event) {
        let logger = get_logger("events.handlers");
        logger.info(&format!("User registered: {}", event.payload));
    }

    /// Handle a successful login event.
    pub fn on_login_success(event: &Event) {
        let logger = get_logger("events.handlers");
        logger.info(&format!("Login success: {}", event.payload));
    }

    /// Handle a failed login event.
    pub fn on_login_failed(event: &Event) {
        let logger = get_logger("events.handlers");
        logger.warn(&format!("Login failed: {}", event.payload));
    }

    /// Handle a payment completed event.
    pub fn on_payment_completed(event: &Event) {
        let logger = get_logger("events.handlers");
        logger.info(&format!("Payment completed: {}", event.payload));
    }

    /// Handle a payment refunded event.
    pub fn on_payment_refunded(event: &Event) {
        let logger = get_logger("events.handlers");
        logger.info(&format!("Payment refunded: {}", event.payload));
    }

    /// Handle a password changed event.
    pub fn on_password_changed(event: &Event) {
        let logger = get_logger("events.handlers");
        logger.info(&format!("Password changed: {}", event.payload));
    }

    /// Handle a session expired event.
    pub fn on_session_expired(event: &Event) {
        let logger = get_logger("events.handlers");
        logger.info(&format!("Session expired: {}", event.payload));
    }
    """,
)

# ─── tasks/mod.rs ───
w(
    "tasks/mod.rs",
    """\
    pub mod email_task;
    pub mod payment_task;
    pub mod cleanup_task;
    """,
)

# ─── tasks/email_task.rs ───
w(
    "tasks/email_task.rs",
    """\
    use crate::utils::helpers::get_logger;
    use crate::services::email::sender::EmailSender;
    use crate::services::base::Service;

    /// A background task for sending pending emails.
    pub struct EmailTask {
        /// The email sender instance.
        sender: EmailSender,
        /// Number of emails processed.
        processed: u64,
    }

    impl EmailTask {
        /// Create a new email task.
        pub fn new(from_address: &str) -> Self {
            let logger = get_logger("tasks.email");
            logger.info("Creating EmailTask");
            Self {
                sender: EmailSender::new(from_address),
                processed: 0,
            }
        }

        /// Run the email task, processing all pending emails.
        pub fn run(&mut self) -> Result<u64, String> {
            let logger = get_logger("tasks.email");
            self.sender.initialize()?;
            logger.info("Running email task");
            self.sender.send("user@example.com", "Welcome", "Hello!")?;
            self.processed += 1;
            logger.info(&format!("Email task complete: {} processed", self.processed));
            Ok(self.processed)
        }

        /// Return the number of emails processed.
        pub fn stats(&self) -> u64 {
            self.processed
        }
    }
    """,
)

# ─── tasks/payment_task.rs ───
w(
    "tasks/payment_task.rs",
    """\
    use crate::utils::helpers::get_logger;
    use crate::services::payment::processor::PaymentProcessor;
    use crate::services::payment::gateway::PaymentGateway;
    use crate::services::base::Service;

    /// A background task for processing pending payments.
    pub struct PaymentTask {
        /// The payment processor instance.
        processor: PaymentProcessor,
        /// Number of payments processed.
        processed: u64,
    }

    impl PaymentTask {
        /// Create a new payment task with the given API key.
        pub fn new(api_key: &str) -> Self {
            let logger = get_logger("tasks.payment");
            logger.info("Creating PaymentTask");
            let gateway = PaymentGateway::new(api_key, "sandbox");
            Self {
                processor: PaymentProcessor::new(gateway),
                processed: 0,
            }
        }

        /// Run the payment task, processing pending payments.
        pub fn run(&mut self) -> Result<u64, String> {
            let logger = get_logger("tasks.payment");
            self.processor.initialize()?;
            logger.info("Running payment task");
            match self.processor.process_payment("user-1", 99.99, "USD", "card_test") {
                Ok(result) => {
                    self.processed += 1;
                    logger.info(&format!("Payment processed: txn={}", result.transaction_id));
                }
                Err(e) => {
                    logger.error(&format!("Payment failed: {}", e));
                }
            }
            Ok(self.processed)
        }

        /// Return the number of payments processed.
        pub fn stats(&self) -> u64 {
            self.processed
        }
    }
    """,
)

# ─── tasks/cleanup_task.rs ───
w(
    "tasks/cleanup_task.rs",
    """\
    use crate::utils::helpers::get_logger;
    use crate::cache::Cache;
    use crate::cache::memory::MemoryCache;

    /// A background task for cleaning up expired data.
    pub struct CleanupTask {
        /// The memory cache to clean.
        cache: MemoryCache,
        /// Number of cleanup runs completed.
        runs: u64,
    }

    impl CleanupTask {
        /// Create a new cleanup task.
        pub fn new() -> Self {
            let logger = get_logger("tasks.cleanup");
            logger.info("Creating CleanupTask");
            Self {
                cache: MemoryCache::new(1000),
                runs: 0,
            }
        }

        /// Run the cleanup task.
        pub fn run(&mut self) -> Result<usize, String> {
            let logger = get_logger("tasks.cleanup");
            logger.info("Running cleanup task");
            let cleared = self.cache.clear();
            self.runs += 1;
            logger.info(&format!("Cleanup complete: {} entries cleared, run #{}", cleared, self.runs));
            Ok(cleared)
        }

        /// Return the number of cleanup runs completed.
        pub fn stats(&self) -> u64 {
            self.runs
        }
    }
    """,
)

# ─── routes/payments.rs ───
w(
    "routes/payments.rs",
    """\
    use crate::utils::helpers::{get_logger, generate_request_id};
    use crate::auth::middleware::auth_middleware;
    use crate::validators::payment;
    use crate::Request;
    use crate::Response;

    /// Handle payment creation requests.
    pub fn create_payment_handler(request: Request) -> Response {
        let logger = get_logger("routes.payments");
        if let Err(e) = auth_middleware(&request) {
            return Response::error(401, &format!("{}", e));
        }
        logger.info("Creating payment");
        let amount = 99.99;
        let currency = "USD";
        let source = "card_xxx";
        match payment::validate(amount, currency, source) {
            Ok(()) => {
                let txn_id = generate_request_id();
                logger.info(&format!("Payment created: {}", txn_id));
                Response::ok(format!("{{\"transaction_id\": \"{}\"}}", txn_id))
            }
            Err(errors) => Response::error(400, &format!("{:?}", errors)),
        }
    }

    /// Handle payment refund requests.
    pub fn refund_handler(request: Request) -> Response {
        let logger = get_logger("routes.payments");
        if let Err(e) = auth_middleware(&request) {
            return Response::error(401, &format!("{}", e));
        }
        logger.info("Processing refund");
        Response::ok("{\"status\": \"refunded\"}".to_string())
    }

    /// Handle listing payments for the authenticated user.
    pub fn list_payments_handler(request: Request) -> Response {
        let logger = get_logger("routes.payments");
        if let Err(e) = auth_middleware(&request) {
            return Response::error(401, &format!("{}", e));
        }
        logger.info("Listing payments");
        Response::ok("[]".to_string())
    }
    """,
)

# ─── routes/users.rs ───
w(
    "routes/users.rs",
    """\
    use crate::utils::helpers::{get_logger, sanitize_input};
    use crate::auth::middleware::auth_middleware;
    use crate::validators::user;
    use crate::models::user::User;
    use crate::Request;
    use crate::Response;

    /// Handle user profile retrieval.
    pub fn get_profile_handler(request: Request) -> Response {
        let logger = get_logger("routes.users");
        if let Err(e) = auth_middleware(&request) {
            return Response::error(401, &format!("{}", e));
        }
        logger.info("Getting user profile");
        Response::ok("{\"id\": 1, \"email\": \"user@example.com\"}".to_string())
    }

    /// Handle user profile update.
    pub fn update_profile_handler(request: Request) -> Response {
        let logger = get_logger("routes.users");
        if let Err(e) = auth_middleware(&request) {
            return Response::error(401, &format!("{}", e));
        }
        let name = sanitize_input("John Doe");
        let email = sanitize_input("john@example.com");
        match user::validate_update(&name, &email) {
            Ok(()) => {
                logger.info("Profile updated");
                Response::ok("{\"status\": \"updated\"}".to_string())
            }
            Err(errors) => Response::error(400, &format!("{:?}", errors)),
        }
    }

    /// Handle user registration.
    pub fn register_handler(request: Request) -> Response {
        let logger = get_logger("routes.users");
        let email = sanitize_input("new@example.com");
        let name = sanitize_input("New User");
        let password = "securepassword123";
        match user::validate(&email, &name, password) {
            Ok(()) => {
                logger.info(&format!("User registered: {}", email));
                Response::ok("{\"status\": \"registered\"}".to_string())
            }
            Err(errors) => Response::error(400, &format!("{:?}", errors)),
        }
    }
    """,
)

# ─── routes/notifications.rs ───
w(
    "routes/notifications.rs",
    """\
    use crate::utils::helpers::{get_logger, sanitize_input};
    use crate::auth::middleware::auth_middleware;
    use crate::Request;
    use crate::Response;

    /// Handle listing notifications for the authenticated user.
    pub fn list_notifications_handler(request: Request) -> Response {
        let logger = get_logger("routes.notifications");
        if let Err(e) = auth_middleware(&request) {
            return Response::error(401, &format!("{}", e));
        }
        logger.info("Listing notifications");
        Response::ok("[]".to_string())
    }

    /// Handle marking a notification as read.
    pub fn mark_read_handler(request: Request) -> Response {
        let logger = get_logger("routes.notifications");
        if let Err(e) = auth_middleware(&request) {
            return Response::error(401, &format!("{}", e));
        }
        logger.info("Marking notification as read");
        Response::ok("{\"status\": \"read\"}".to_string())
    }

    /// Handle sending a test notification.
    pub fn send_test_handler(request: Request) -> Response {
        let logger = get_logger("routes.notifications");
        if let Err(e) = auth_middleware(&request) {
            return Response::error(401, &format!("{}", e));
        }
        let subject = sanitize_input("Test Notification");
        let body = sanitize_input("This is a test notification body");
        logger.info(&format!("Sending test notification: {}", subject));
        Response::ok("{\"status\": \"sent\"}".to_string())
    }
    """,
)

# ─── models/payment.rs ───
w(
    "models/payment.rs",
    """\
    use crate::utils::helpers::get_logger;

    /// Possible states of a payment.
    #[derive(Debug, Clone, PartialEq)]
    pub enum PaymentStatus {
        /// Payment is waiting to be processed.
        Pending,
        /// Payment is currently being processed.
        Processing,
        /// Payment was successfully completed.
        Completed,
        /// Payment failed.
        Failed,
        /// Payment was refunded.
        Refunded,
    }

    /// A payment record in the system.
    pub struct Payment {
        /// Unique payment identifier.
        pub id: u64,
        /// The ID of the user who made the payment.
        pub user_id: u64,
        /// The payment amount.
        pub amount: f64,
        /// The currency code.
        pub currency: String,
        /// External transaction identifier.
        pub transaction_id: String,
        /// Current payment status.
        pub status: PaymentStatus,
    }

    impl Payment {
        /// Create a new pending payment.
        pub fn new(id: u64, user_id: u64, amount: f64, currency: &str, txn_id: &str) -> Self {
            let logger = get_logger("models.payment");
            logger.info(&format!("Creating payment: {} {} {}", id, amount, currency));
            Self {
                id,
                user_id,
                amount,
                currency: currency.to_string(),
                transaction_id: txn_id.to_string(),
                status: PaymentStatus::Pending,
            }
        }

        /// Mark the payment as completed.
        pub fn complete(&mut self) {
            let logger = get_logger("models.payment");
            self.status = PaymentStatus::Completed;
            logger.info(&format!("Payment {} completed", self.transaction_id));
        }

        /// Mark the payment as failed.
        pub fn fail(&mut self, reason: &str) {
            let logger = get_logger("models.payment");
            self.status = PaymentStatus::Failed;
            logger.info(&format!("Payment {} failed: {}", self.transaction_id, reason));
        }

        /// Refund the payment.
        pub fn refund(&mut self) {
            let logger = get_logger("models.payment");
            self.status = PaymentStatus::Refunded;
            logger.info(&format!("Payment {} refunded", self.transaction_id));
        }

        /// Check if the payment is completed.
        pub fn is_completed(&self) -> bool {
            self.status == PaymentStatus::Completed
        }

        /// Find a payment by transaction ID (simulated).
        pub fn find_by_transaction_id(txn_id: &str) -> Option<Payment> {
            let logger = get_logger("models.payment");
            logger.info(&format!("Looking up payment by txn: {}", txn_id));
            None
        }
    }
    """,
)

# ─── models/notification.rs ───
w(
    "models/notification.rs",
    """\
    use crate::utils::helpers::get_logger;

    /// Delivery channels for notifications.
    #[derive(Debug, Clone, PartialEq)]
    pub enum NotificationChannel {
        /// Email delivery.
        Email,
        /// SMS delivery.
        Sms,
        /// Push notification.
        Push,
        /// In-app notification.
        InApp,
    }

    /// A notification record in the system.
    pub struct Notification {
        /// Unique notification identifier.
        pub id: u64,
        /// The target user ID.
        pub user_id: u64,
        /// The delivery channel.
        pub channel: NotificationChannel,
        /// The notification subject.
        pub subject: String,
        /// The notification body.
        pub body: String,
        /// Whether the notification has been read.
        pub read: bool,
    }

    impl Notification {
        /// Create a new unread notification.
        pub fn new(id: u64, user_id: u64, channel: NotificationChannel, subject: &str, body: &str) -> Self {
            let logger = get_logger("models.notification");
            logger.info(&format!("Creating notification {} for user {}", id, user_id));
            Self {
                id,
                user_id,
                channel,
                subject: subject.to_string(),
                body: body.to_string(),
                read: false,
            }
        }

        /// Mark the notification as read.
        pub fn mark_read(&mut self) {
            let logger = get_logger("models.notification");
            self.read = true;
            logger.info(&format!("Notification {} marked as read", self.id));
        }

        /// Find notifications for a user (simulated).
        pub fn find_by_user(user_id: u64) -> Vec<Notification> {
            let logger = get_logger("models.notification");
            logger.info(&format!("Looking up notifications for user {}", user_id));
            Vec::new()
        }
    }
    """,
)

# ─── models/event.rs ───
w(
    "models/event.rs",
    """\
    use crate::utils::helpers::get_logger;

    /// Types of events in the system.
    #[derive(Debug, Clone, PartialEq)]
    pub enum EventType {
        /// A user was registered.
        UserRegistered,
        /// A login attempt succeeded.
        LoginSuccess,
        /// A login attempt failed.
        LoginFailed,
        /// A payment was completed.
        PaymentCompleted,
        /// A payment was refunded.
        PaymentRefunded,
        /// A password was changed.
        PasswordChanged,
    }

    /// A persisted event record.
    pub struct EventRecord {
        /// Unique event identifier.
        pub id: u64,
        /// The type of event.
        pub event_type: EventType,
        /// The serialized event payload.
        pub payload: String,
        /// The actor who triggered the event.
        pub actor_id: Option<u64>,
        /// Timestamp of the event.
        pub created_at: u64,
    }

    impl EventRecord {
        /// Create a new event record.
        pub fn new(id: u64, event_type: EventType, payload: &str, actor_id: Option<u64>) -> Self {
            let logger = get_logger("models.event");
            logger.info(&format!("Creating event: {:?}", event_type));
            Self {
                id,
                event_type,
                payload: payload.to_string(),
                actor_id,
                created_at: 0,
            }
        }

        /// Find events by type (simulated).
        pub fn find_by_type(event_type: &EventType) -> Vec<EventRecord> {
            let logger = get_logger("models.event");
            logger.info(&format!("Looking up events of type: {:?}", event_type));
            Vec::new()
        }

        /// Find events by actor (simulated).
        pub fn find_by_actor(actor_id: u64) -> Vec<EventRecord> {
            let logger = get_logger("models.event");
            logger.info(&format!("Looking up events for actor: {}", actor_id));
            Vec::new()
        }
    }
    """,
)

print(f"gen_rs.py: webapp_rs fixture generation complete.")
print(f"Base directory: {BASE}")
