use crate::core::session::SessionState;

#[derive(Clone, Copy, Debug)]
pub struct SessionToolOptions<'a> {
    pub format: Option<&'a str>,
    pub path: Option<&'a str>,
    pub write: bool,
    pub privacy: Option<&'a str>,
    /// For `action=configure`: set terse output mode when `Some`.
    pub terse: Option<bool>,
}

pub fn handle(
    session: &mut SessionState,
    tool_calls: &[(String, u64)],
    action: &str,
    value: Option<&str>,
    session_id: Option<&str>,
    opts: SessionToolOptions<'_>,
) -> String {
    match action {
        // "show" is the natural synonym agents reach for first (#658).
        "status" | "show" => session.format_compact(),

        "load" => {
            let loaded = if let Some(id) = session_id {
                SessionState::load_by_id(id)
            } else {
                SessionState::load_latest()
            };

            if let Some(prev) = loaded {
                let summary = prev.format_compact();
                *session = prev;
                format!("Session loaded.\n{summary}")
            } else {
                let id_str = session_id.unwrap_or("latest");
                format!("No session found (id: {id_str}). Starting fresh.")
            }
        }

        "save" => match session.save() {
            Ok(()) => format!("Session {} saved (v{}).", session.id, session.version),
            Err(e) => format!("Save failed: {e}"),
        },

        "export" => {
            let requested_privacy =
                crate::core::ccp_session_bundle::BundlePrivacyV1::parse(opts.privacy);
            if requested_privacy == crate::core::ccp_session_bundle::BundlePrivacyV1::Full
                && crate::core::roles::active_role_name() != "admin"
            {
                return "ERROR: privacy=full requires role 'admin'.".to_string();
            }

            let bundle =
                crate::core::ccp_session_bundle::build_bundle_v1(session, requested_privacy);
            let json = match crate::core::ccp_session_bundle::serialize_bundle_v1_pretty(&bundle) {
                Ok(s) => s,
                Err(e) => return e,
            };

            let format = opts
                .format
                .unwrap_or(if opts.write { "summary" } else { "json" });
            let root = session.project_root.clone().unwrap_or_else(|| {
                std::env::current_dir()
                    .map_or_else(|_| ".".to_string(), |p| p.to_string_lossy().to_string())
            });
            let root_path = std::path::PathBuf::from(&root);

            let mut written: Option<String> = None;
            if opts.write || opts.path.is_some() {
                let ts = chrono::Utc::now().format("%Y%m%dT%H%M%SZ").to_string();
                let candidate = if let Some(p) = opts.path.or(value) {
                    let p = std::path::PathBuf::from(p);
                    if p.is_absolute() {
                        p
                    } else {
                        root_path.join(p)
                    }
                } else {
                    root_path
                        .join(".lean-ctx")
                        .join("session_bundles")
                        .join(format!(
                            "ccp-session-bundle-v1_{}_{}.json",
                            bundle.session.id, ts
                        ))
                };

                let jailed = match crate::core::io_boundary::jail_and_check_path(
                    "ctx_session.export",
                    candidate.as_path(),
                    root_path.as_path(),
                ) {
                    Ok((p, _warning)) => p,
                    Err(e) => return e,
                };

                // Read-only-roots choke point (#475): export must not write a
                // bundle into a read-only root even when the jail allows reads.
                if let Err(e) = crate::core::pathjail::enforce_writable(&jailed) {
                    return format!("Export write failed: {e}");
                }
                if let Err(e) = crate::core::ccp_session_bundle::write_bundle_v1(&jailed, &json) {
                    return format!("Export write failed: {e}");
                }
                written = Some(jailed.to_string_lossy().to_string());
            }

            match format {
                "summary" => {
                    let mut out = format!(
                        "CCP session bundle exported (v{}).\n\
schema_version: {}\n\
session_id: {}\n\
bytes: {}\n",
                        bundle.session.version,
                        bundle.schema_version,
                        bundle.session.id,
                        json.len()
                    );
                    if let Some(p) = written {
                        out.push_str(&format!("path: {p}\n"));
                    }
                    if let Some(h) = bundle.project.project_root_hash {
                        out.push_str(&format!("project_root_hash: {h}\n"));
                    }
                    if let Some(h) = bundle.project.project_identity_hash {
                        out.push_str(&format!("project_identity_hash: {h}\n"));
                    }
                    out
                }
                _ => {
                    if let Some(p) = written {
                        format!("{json}\n\npath: {p}")
                    } else {
                        json
                    }
                }
            }
        }

        "import" => {
            let root = session.project_root.clone().unwrap_or_else(|| {
                std::env::current_dir()
                    .map_or_else(|_| ".".to_string(), |p| p.to_string_lossy().to_string())
            });
            let root_path = std::path::PathBuf::from(&root);

            let Some(p) = opts.path.or(value) else {
                return "ERROR: path is required for action=import".to_string();
            };

            let candidate = {
                let p = std::path::PathBuf::from(p);
                if p.is_absolute() {
                    p
                } else {
                    root_path.join(p)
                }
            };
            let jailed = match crate::core::io_boundary::jail_and_check_path(
                "ctx_session.import",
                candidate.as_path(),
                root_path.as_path(),
            ) {
                Ok((p, _warning)) => p,
                Err(e) => return e,
            };

            let bundle = match crate::core::ccp_session_bundle::read_bundle_v1(&jailed) {
                Ok(b) => b,
                Err(e) => return format!("Import failed: {e}"),
            };

            // Replayability hint: compare project identity hashes (best-effort).
            let current_root_hash = crate::core::project_hash::hash_project_root(&root);
            let current_identity_hash = crate::core::project_hash::project_identity(&root)
                .as_deref()
                .map(|s| {
                    use md5::{Digest, Md5};
                    let mut h = Md5::new();
                    h.update(s.as_bytes());
                    crate::core::agent_identity::hex_encode(&h.finalize())
                });

            let mut warning: Option<String> = None;
            if let Some(ref exported) = bundle.project.project_root_hash
                && exported != &current_root_hash
            {
                warning = Some(
                    "WARNING: project_root_hash mismatch (importing into different project root)."
                        .to_string(),
                );
            }
            if let (Some(exported), Some(current)) = (
                bundle.project.project_identity_hash.as_ref(),
                current_identity_hash.as_ref(),
            ) && exported != current
            {
                warning = Some("WARNING: project_identity_hash mismatch (importing into different project identity).".to_string());
            }

            let report = crate::core::ccp_session_bundle::import_bundle_v1_into_session(
                session,
                &bundle,
                Some(&root),
            );
            let _ = session.save();

            let mut out = format!(
                "CCP session bundle imported.\n\
session_id: {}\n\
version: {}\n\
files_touched: {}\n\
stale_files: {}\n",
                report.session_id, report.version, report.files_touched, report.stale_files
            );
            if let Some(w) = warning {
                out.push_str(&format!("{w}\n"));
            }
            out
        }

        "task" => {
            let desc = value.unwrap_or("(no description)");
            session.set_task(desc, None);
            // Auto-record an episode when the task is marked complete.
            // Without this, Episodes only fill via an explicit
            // `action=episodes value=record` call that nobody makes (#477).
            let lower = desc.to_lowercase();
            let completed =
                desc.contains("[100%]") || lower.contains("[done]") || lower.contains("[complete]");
            let mut note = String::new();
            if completed {
                match auto_record_episode(session, tool_calls) {
                    Ok(Some(id)) => {
                        note = format!("\nEpisode auto-recorded: {id}");
                    }
                    Ok(None) => {} // same task already recorded — skip duplicate
                    Err(e) => {
                        note = format!("\n(episode auto-record skipped: {e})");
                    }
                }
            }
            format!("Task set: {desc}{note}")
        }

        "finding" => {
            let summary = value.unwrap_or("(no summary)");
            let (file, line, text) = parse_finding_value(summary);
            session.add_finding(file.as_deref(), line, text);
            format!("Finding added: {summary}")
        }

        "decision" => {
            let desc = value.unwrap_or("(no description)");
            session.add_decision(desc, None);
            format!("Decision recorded: {desc}")
        }

        "reset" => {
            let _ = session.save();
            let old_id = session.id.clone();
            *session = SessionState::new();
            crate::core::budget_tracker::BudgetTracker::global().reset();
            // Clear the persistent context ledger so pressure resets to 0%
            let mut ledger = crate::core::context_ledger::ContextLedger::load();
            ledger.reset();
            ledger.save();
            if let Ok(data_dir) = crate::core::data_dir::lean_ctx_data_dir() {
                let radar_path = data_dir.join("context_radar.jsonl");
                let prev = data_dir.join("context_radar.prev.jsonl");
                let _ = std::fs::rename(&radar_path, &prev);
            }
            format!(
                "Session reset. Previous: {old_id}. New: {}. Ledger cleared (0% pressure).",
                session.id
            )
        }

        "list" => {
            let sessions = SessionState::list_sessions();
            if sessions.is_empty() {
                return "No sessions found.".to_string();
            }
            let mut lines = vec![format!("Sessions ({}):", sessions.len())];
            for s in sessions.iter().take(10) {
                let task = s.task.as_deref().unwrap_or("(no task)");
                let task_short: String = task.chars().take(40).collect();
                lines.push(format!(
                    "  {} v{} | {} calls | {} tok | {}",
                    s.id, s.version, s.tool_calls, s.tokens_saved, task_short
                ));
            }
            if sessions.len() > 10 {
                lines.push(format!("  ... +{} more", sessions.len() - 10));
            }
            lines.join("\n")
        }

        "cleanup" => {
            let removed = SessionState::cleanup_old_sessions(7);
            format!("Cleaned up {removed} old session(s) (>7 days).")
        }

        "configure" => match opts.terse {
            Some(enabled) => {
                session.terse_mode = enabled;
                session.increment();
                format!("Session configured: terse_mode={enabled}")
            }
            None => format!("Session config: terse_mode={}", session.terse_mode),
        },

        "snapshot" => match session.save_compaction_snapshot() {
            Ok(snapshot) => {
                format!(
                    "Compaction snapshot saved ({} bytes).\n{snapshot}",
                    snapshot.len()
                )
            }
            Err(e) => format!("Snapshot failed: {e}"),
        },

        "restore" => {
            let snapshot = if let Some(id) = session_id {
                SessionState::load_compaction_snapshot(id)
            } else {
                SessionState::load_latest_snapshot()
            };
            match snapshot {
                Some(s) => format!("Session restored from compaction snapshot:\n{s}"),
                None => "No compaction snapshot found. Session continues fresh.".to_string(),
            }
        }

        "resume" => session.build_resume_block(),

        "profile" => {
            use crate::core::profiles;
            if let Some(name) = value {
                if let Ok(p) = profiles::set_active_profile(name) {
                    format!(
                        "Profile switched to '{name}'.\n\
                         Read mode: {}, Budget: {} tokens, CRP: {}, Density: {}",
                        p.read.default_mode_effective(),
                        p.budget.max_context_tokens_effective(),
                        p.compression.crp_mode_effective(),
                        p.compression.output_density_effective(),
                    )
                } else {
                    let available: Vec<String> = profiles::list_profiles()
                        .iter()
                        .map(|p| p.name.clone())
                        .collect();
                    format!(
                        "Profile '{name}' not found. Available: {}",
                        available.join(", ")
                    )
                }
            } else {
                let name = profiles::active_profile_name();
                let p = profiles::active_profile();
                let list = profiles::list_profiles();
                let mut out = format!(
                    "Active profile: {name}\n\
                     Read: {}, Budget: {} tok, CRP: {}, Density: {}\n\n\
                     Available profiles:",
                    p.read.default_mode_effective(),
                    p.budget.max_context_tokens_effective(),
                    p.compression.crp_mode_effective(),
                    p.compression.output_density_effective(),
                );
                for info in &list {
                    let marker = if info.name == name { " *" } else { "  " };
                    out.push_str(&format!(
                        "\n{marker} {:<14} ({}) {}",
                        info.name, info.source, info.description
                    ));
                }
                out.push_str("\n\nSwitch: ctx_session action=profile value=<name>");
                out
            }
        }

        "budget" => {
            use crate::core::budget_tracker::BudgetTracker;
            let snap = BudgetTracker::global().check();
            let mut out = snap.format_compact();

            if let Ok(data_dir) = crate::core::data_dir::lean_ctx_data_dir() {
                let window = crate::core::context_radar::default_window_for_client("cursor");
                let radar = crate::core::context_radar::ContextRadar::load(&data_dir, window);
                let radar_display = radar.format_display();
                if !radar_display.is_empty() {
                    out.push_str("\n\n");
                    out.push_str(&radar_display);
                }
            }
            out
        }

        "role" => {
            use crate::core::roles;
            if let Some(name) = value {
                match roles::set_active_role(name) {
                    Ok(r) => {
                        crate::core::budget_tracker::BudgetTracker::global().reset();
                        format!(
                            "Role switched to '{name}'.\n\
                             Shell: {}, Budget: {} tokens / {} shell / ${:.2}\n\
                             Tools: {}",
                            r.role.shell_policy,
                            r.limits.max_context_tokens,
                            r.limits.max_shell_invocations,
                            r.limits.max_cost_usd,
                            if r.tools.allowed.iter().any(|a| a == "*") {
                                let denied = if r.tools.denied.is_empty() {
                                    "none".to_string()
                                } else {
                                    format!("denied: {}", r.tools.denied.join(", "))
                                };
                                format!("* (all), {denied}")
                            } else {
                                r.tools.allowed.join(", ")
                            }
                        )
                    }
                    Err(e) => {
                        let available: Vec<String> =
                            roles::list_roles().iter().map(|r| r.name.clone()).collect();
                        format!("{e}. Available: {}", available.join(", "))
                    }
                }
            } else {
                let name = roles::active_role_name();
                let r = roles::active_role();
                let list = roles::list_roles();
                let mut out = format!(
                    "Active role: {name}\n\
                     Description: {}\n\
                     Shell policy: {}, Budget: {} tokens / {} shell / ${:.2}\n\n\
                     Available roles:",
                    r.role.description,
                    r.role.shell_policy,
                    r.limits.max_context_tokens,
                    r.limits.max_shell_invocations,
                    r.limits.max_cost_usd,
                );
                for info in &list {
                    let marker = if info.is_active { " *" } else { "  " };
                    out.push_str(&format!(
                        "\n{marker} {:<14} ({}) {}",
                        info.name, info.source, info.description
                    ));
                }
                out.push_str("\n\nSwitch: ctx_session action=role value=<name>");
                out
            }
        }

        "diff" => {
            let parts: Vec<&str> = value.unwrap_or("").split_whitespace().collect();
            if parts.len() < 2 {
                return "Usage: ctx_session diff <session_id_a> <session_id_b> [format]\n\
                        Formats: summary (default), json\n\
                        Example: ctx_session diff abc123 def456 json"
                    .to_string();
            }
            let id_a = parts[0];
            let id_b = parts[1];
            let format = parts.get(2).copied().unwrap_or("summary");

            let sess_a = SessionState::load_by_id(id_a);
            let sess_b = SessionState::load_by_id(id_b);

            match (sess_a, sess_b) {
                (Some(a), Some(b)) => {
                    let d = crate::core::session_diff::diff_sessions(&a, &b);
                    match format {
                        "json" => d.format_json(),
                        _ => d.format_summary(),
                    }
                }
                (None, _) => format!("Session not found: {id_a}"),
                (_, None) => format!("Session not found: {id_b}"),
            }
        }

        "slo" => match value {
            Some("reload") => {
                crate::core::slo::reload();
                "SLO definitions reloaded from disk.".to_string()
            }
            Some("history") => {
                let hist = crate::core::slo::violation_history(20);
                if hist.is_empty() {
                    "No SLO violations recorded.".to_string()
                } else {
                    let mut out = format!("SLO violations (last {}):\n", hist.len());
                    for v in &hist {
                        out.push_str(&format!(
                            "  {} {} ({}) {:.2} vs {:.2} → {}\n",
                            v.timestamp, v.slo_name, v.metric, v.actual, v.threshold, v.action
                        ));
                    }
                    out
                }
            }
            Some("clear") => {
                crate::core::slo::clear_violations();
                "SLO violation history cleared.".to_string()
            }
            _ => {
                let snap = crate::core::slo::evaluate_quiet();
                snap.format_compact()
            }
        },

        "output_stats" => {
            let snap = crate::core::output_verification::stats_snapshot();
            let mut out = snap.format_compact();
            // Agent-output echo summary (#501).
            let echo = crate::core::output_echo::load_stats();
            if !echo.reports.is_empty() {
                out.push_str(&format!(
                    "\nOutput echo: {:.0}% avg over last {} replies ({} analyzed total)",
                    echo.avg_ratio(50) * 100.0,
                    echo.reports.len(),
                    echo.total_analyzed
                ));
            }
            out
        }

        "verify" => {
            let snap = crate::core::output_verification::stats_snapshot();
            format!(
                "DEPRECATION: action=\"verify\" is renamed to action=\"output_stats\" (ctx_verify is the full observability stack).\n{}",
                snap.format_compact()
            )
        }

        "episodes" => {
            let project_root = session.project_root.clone().unwrap_or_else(|| {
                std::env::current_dir().map_or_else(
                    |_| "unknown".to_string(),
                    |p| p.to_string_lossy().to_string(),
                )
            });
            let policy = match crate::core::config::Config::load().memory_policy_effective() {
                Ok(p) => p,
                Err(e) => {
                    let path = crate::core::config::Config::path().map_or_else(
                        || "~/.lean-ctx/config.toml".to_string(),
                        |p| p.display().to_string(),
                    );
                    return format!("Error: invalid memory policy: {e}\nFix: edit {path}");
                }
            };
            let hash = crate::core::project_hash::hash_project_root(&project_root);
            let mut store = crate::core::episodic_memory::EpisodicStore::load_or_create(&hash);

            match value {
                Some("record") => {
                    let ep = crate::core::episodic_memory::create_episode_from_session(
                        session, tool_calls,
                    );
                    let id = ep.id.clone();
                    store.record_episode(ep, &policy.episodic);
                    if let Err(e) = store.save() {
                        return format!("Episode record failed: {e}");
                    }
                    crate::core::events::emit(crate::core::events::EventKind::KnowledgeUpdate {
                        category: "episodic".to_string(),
                        key: id.clone(),
                        action: "record".to_string(),
                    });
                    // Auto-learning (GL #478): every new episode re-runs workflow
                    // detection, so Procedures fill themselves over time.
                    let learned = crate::core::procedural_memory::auto_detect_from_episodes(
                        &hash,
                        &policy.procedural,
                    );
                    match learned {
                        Some(n) if n > 0 => {
                            format!(
                                "Episode recorded: {id} (procedures auto-updated: {n} known workflows)"
                            )
                        }
                        _ => format!("Episode recorded: {id}"),
                    }
                }
                Some(v) if v.starts_with("search ") => {
                    let q = v.trim_start_matches("search ").trim();
                    let hits = store.search(q);
                    if hits.is_empty() {
                        return "No episodes matched.".to_string();
                    }
                    let mut out = format!("Episodes matched ({}):", hits.len());
                    for ep in hits.into_iter().take(10) {
                        let task: String = ep.task_description.chars().take(50).collect();
                        out.push_str(&format!(
                            "\n  {} | {} | {} | {}",
                            ep.id,
                            ep.timestamp,
                            ep.outcome.label(),
                            task
                        ));
                    }
                    out
                }
                Some(v) if v.starts_with("file ") => {
                    let f = v.trim_start_matches("file ").trim();
                    let hits = store.by_file(f);
                    let mut out = format!("Episodes for file match '{f}' ({}):", hits.len());
                    for ep in hits.into_iter().take(10) {
                        let task: String = ep.task_description.chars().take(50).collect();
                        out.push_str(&format!(
                            "\n  {} | {} | {} | {}",
                            ep.id,
                            ep.timestamp,
                            ep.outcome.label(),
                            task
                        ));
                    }
                    out
                }
                Some(v) if v.starts_with("outcome ") => {
                    let label = v.trim_start_matches("outcome ").trim();
                    let hits = store.by_outcome(label);
                    let mut out = format!("Episodes outcome '{label}' ({}):", hits.len());
                    for ep in hits.into_iter().take(10) {
                        let task: String = ep.task_description.chars().take(50).collect();
                        out.push_str(&format!("\n  {} | {} | {}", ep.id, ep.timestamp, task));
                    }
                    out
                }
                _ => {
                    let stats = store.stats();
                    let recent = store.recent(10);
                    let mut out = format!(
                        "Episodic memory: {} episodes, success_rate={:.0}%, tokens_total={}\n\nRecent:",
                        stats.total_episodes,
                        stats.success_rate * 100.0,
                        stats.total_tokens
                    );
                    for ep in recent {
                        let task: String = ep.task_description.chars().take(60).collect();
                        out.push_str(&format!(
                            "\n  {} | {} | {} | {}",
                            ep.id,
                            ep.timestamp,
                            ep.outcome.label(),
                            task
                        ));
                    }
                    out.push_str("\n\nActions: ctx_session action=episodes value=record|\"search <q>\"|\"file <path>\"|\"outcome success|failure|partial|unknown\"");
                    out
                }
            }
        }

        "procedures" => {
            let project_root = session.project_root.clone().unwrap_or_else(|| {
                std::env::current_dir().map_or_else(
                    |_| "unknown".to_string(),
                    |p| p.to_string_lossy().to_string(),
                )
            });
            let policy = match crate::core::config::Config::load().memory_policy_effective() {
                Ok(p) => p,
                Err(e) => {
                    let path = crate::core::config::Config::path().map_or_else(
                        || "~/.lean-ctx/config.toml".to_string(),
                        |p| p.display().to_string(),
                    );
                    return format!("Error: invalid memory policy: {e}\nFix: edit {path}");
                }
            };
            let hash = crate::core::project_hash::hash_project_root(&project_root);
            let episodes = crate::core::episodic_memory::EpisodicStore::load_or_create(&hash);
            let mut procs = crate::core::procedural_memory::ProceduralStore::load_or_create(&hash);

            match value {
                Some("detect") => {
                    procs.detect_patterns(&episodes.episodes, &policy.procedural);
                    if let Err(e) = procs.save() {
                        return format!("Procedure detect failed: {e}");
                    }
                    crate::core::events::emit(crate::core::events::EventKind::KnowledgeUpdate {
                        category: "procedural".to_string(),
                        key: hash.clone(),
                        action: "detect".to_string(),
                    });
                    format!(
                        "Procedures updated. Total procedures: {} (episodes: {}).",
                        procs.procedures.len(),
                        episodes.episodes.len()
                    )
                }
                Some(v) if v.starts_with("suggest ") => {
                    let task = v.trim_start_matches("suggest ").trim();
                    let hits = procs.suggest(task);
                    if hits.is_empty() {
                        return "No procedures matched.".to_string();
                    }
                    let mut out = format!("Procedures suggested ({}):", hits.len());
                    for p in hits.into_iter().take(10) {
                        out.push_str(&format!(
                            "\n  {} | conf={:.0}% | success={:.0}% | steps={}",
                            p.name,
                            p.confidence * 100.0,
                            p.success_rate() * 100.0,
                            p.steps.len()
                        ));
                    }
                    out
                }
                _ => {
                    let task = session
                        .task
                        .as_ref()
                        .map(|t| t.description.clone())
                        .unwrap_or_default();
                    let suggestions = if task.is_empty() {
                        Vec::new()
                    } else {
                        procs.suggest(&task)
                    };

                    let mut out = format!(
                        "Procedural memory: {} procedures (episodes: {})",
                        procs.procedures.len(),
                        episodes.episodes.len()
                    );

                    if !task.is_empty() {
                        out.push_str(&format!(
                            "\nTask: {}",
                            task.chars().take(80).collect::<String>()
                        ));
                        if !suggestions.is_empty() {
                            out.push_str("\n\nSuggested:");
                            for p in suggestions.into_iter().take(5) {
                                out.push_str(&format!(
                                    "\n  {} | conf={:.0}% | success={:.0}% | steps={}",
                                    p.name,
                                    p.confidence * 100.0,
                                    p.success_rate() * 100.0,
                                    p.steps.len()
                                ));
                            }
                        }
                    }

                    out.push_str("\n\nActions: ctx_session action=procedures value=detect|\"suggest <task>\"");
                    out
                }
            }
        }

        _ => format!(
            "Unknown action: {action}. Use: status, load, save, task, finding, decision, reset, list, cleanup, snapshot, restore, resume, configure, profile, role, budget, slo, diff, output_stats, verify, export, import, episodes, procedures"
        ),
    }
}

/// Records an episode from the current session when a task completes.
///
/// Returns `Ok(Some(id))` on record, `Ok(None)` when the latest episode
/// already covers the same task (duplicate guard), `Err` on policy/IO issues.
fn auto_record_episode(
    session: &SessionState,
    tool_calls: &[(String, u64)],
) -> Result<Option<String>, String> {
    let project_root = session.project_root.clone().unwrap_or_else(|| {
        std::env::current_dir().map_or_else(
            |_| "unknown".to_string(),
            |p| p.to_string_lossy().to_string(),
        )
    });
    let policy = crate::core::config::Config::load()
        .memory_policy_effective()
        .map_err(|e| format!("invalid memory policy: {e}"))?;
    let hash = crate::core::project_hash::hash_project_root(&project_root);
    let mut store = crate::core::episodic_memory::EpisodicStore::load_or_create(&hash);

    let mut ep = crate::core::episodic_memory::create_episode_from_session(session, tool_calls);
    if let Some(last) = store.recent(1).first()
        && last.task_description == ep.task_description
    {
        return Ok(None);
    }
    // Convert cumulative session counters into per-task delta + duration.
    crate::core::episodic_memory::finalize_episode_metrics(&mut ep, &store, session.started_at);

    let id = ep.id.clone();
    store.record_episode(ep, &policy.episodic);
    store.save()?;
    crate::core::events::emit(crate::core::events::EventKind::KnowledgeUpdate {
        category: "episodic".to_string(),
        key: id.clone(),
        action: "auto_record".to_string(),
    });

    // Each new episode is a chance to learn a procedure: mine the episode
    // history for repeated tool sequences. Best-effort — pattern detection
    // must never fail the task update itself (#478).
    let episodes: Vec<crate::core::episodic_memory::Episode> =
        store.recent(50).into_iter().cloned().collect();
    let mut procs = crate::core::procedural_memory::ProceduralStore::load_or_create(&hash);
    let before = procs.procedures.len();
    procs.detect_patterns(&episodes, &policy.procedural);
    if procs.procedures.len() > before && procs.save().is_ok() {
        crate::core::events::emit(crate::core::events::EventKind::KnowledgeUpdate {
            category: "procedural".to_string(),
            key: format!("{} new", procs.procedures.len() - before),
            action: "auto_learn".to_string(),
        });
    }

    Ok(Some(id))
}

fn parse_finding_value(value: &str) -> (Option<String>, Option<u32>, &str) {
    const EM_DASH_SEP: &str = " \u{2014} ";
    const ASCII_SEP: &str = " - ";

    let (dash_pos, sep) = if let Some(p) = value.find(EM_DASH_SEP) {
        (Some(p), EM_DASH_SEP)
    } else {
        (value.find(ASCII_SEP), ASCII_SEP)
    };

    if let Some(pos) = dash_pos {
        let location = &value[..pos];
        let text = &value[pos + sep.len()..];

        if let Some(colon_pos) = location.rfind(':') {
            let file = &location[..colon_pos];
            if let Ok(line) = location[colon_pos + 1..].parse::<u32>() {
                return (Some(file.to_string()), Some(line), text);
            }
        }
        return (Some(location.to_string()), None, text);
    }
    (None, None, value)
}

#[cfg(test)]
mod tests {
    use super::parse_finding_value;

    #[test]
    fn finding_with_em_dash_and_file_line() {
        let (file, line, text) =
            parse_finding_value("auth.rs:42 \u{2014} missing token validation");
        assert_eq!(file.as_deref(), Some("auth.rs"));
        assert_eq!(line, Some(42));
        assert_eq!(text, "missing token validation");
    }

    #[test]
    fn finding_with_ascii_dash_and_file_line() {
        let (file, line, text) = parse_finding_value("auth.rs:42 - missing token validation");
        assert_eq!(file.as_deref(), Some("auth.rs"));
        assert_eq!(line, Some(42));
        assert_eq!(text, "missing token validation");
    }

    #[test]
    fn finding_with_em_dash_no_line() {
        let (file, line, text) = parse_finding_value("auth module \u{2014} needs refactoring");
        assert_eq!(file.as_deref(), Some("auth module"));
        assert_eq!(line, None);
        assert_eq!(text, "needs refactoring");
    }

    #[test]
    fn finding_plain_text() {
        let (file, line, text) = parse_finding_value("plain text finding");
        assert_eq!(file, None);
        assert_eq!(line, None);
        assert_eq!(text, "plain text finding");
    }

    #[test]
    fn finding_cyrillic_with_em_dash_issue_272() {
        let value = "ruff: pyproject.toml dev-group \u{2014} >=0.15.14,<0.16.0 (был 0.14.x)";
        let (file, line, text) = parse_finding_value(value);
        assert_eq!(file.as_deref(), Some("ruff: pyproject.toml dev-group"));
        assert_eq!(line, None);
        assert_eq!(text, ">=0.15.14,<0.16.0 (был 0.14.x)");
    }

    #[test]
    fn finding_em_dash_at_start() {
        let (file, line, text) = parse_finding_value("src/main.rs:1 \u{2014} entry point");
        assert_eq!(file.as_deref(), Some("src/main.rs"));
        assert_eq!(line, Some(1));
        assert_eq!(text, "entry point");
    }
}
