# All files / lib/parsers yaml-parser.js

55.69% Statements 44/79
39.13% Branches 18/46
50% Functions 5/10
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     /**
     * YAML Parser for rosetta.yaml
     *
     * Handles parsing and serialization of rosetta.yaml files
     * with schema validation integration
     */

    import fs from 'fs-extra';
    import yaml from 'js-yaml';
    import { CanonicalAST } from '../ast/canonical.js';
    import { validateYAML, checkRequiredFields } from '../validation/schema-validator.js';
    import { createMetadata, updateMetadata } from '../ast/metadata.js';

    /**
     * Parse a rosetta.yaml file
     * @param {string} filePath - Path to the rosetta.yaml file
     * @returns {Promise<CanonicalAST>} The parsed Canonical AST
     * @throws {Error} If file doesn't exist, parsing fails, or validation fails
     */
    export async function parseYAMLFile(filePath) {
      // Check if file exists
      const exists = await fs.pathExists(filePath);
      if (!exists) {
        throw new Error(`rosetta.yaml not found at: ${filePath}`);
      }

      // Read file
      const content = await fs.readFile(filePath, 'utf8');

      // Parse content
      return parseYAMLContent(content);
    }

    /**
     * Parse YAML content string
     * @param {string} yamlContent - YAML content as string
     * @returns {CanonicalAST} The parsed Canonical AST
     * @throws {Error} If parsing fails or validation fails
     */
    export function parseYAMLContent(yamlContent) {
      let yamlObject;

      try {
        yamlObject = yaml.load(yamlContent);
      } catch (error) {
        throw new Error(`YAML parsing failed: ${error.message}`);
      }

      Iif (!yamlObject || typeof yamlObject !== 'object') {
        throw new Error('YAML content is not a valid object');
      }

      // Quick validation check
      const quickCheck = checkRequiredFields(yamlObject);
      if (!quickCheck.valid) {
        throw new Error(`Missing required fields: ${quickCheck.missing.join(', ')}`);
      }

      // Create AST
      const ast = new CanonicalAST(yamlObject);

      // Full validation
      const validation = ast.validate();
      if (!validation.valid) {
        const errorMessages = validation.errors.map(e => `  - ${e.path}: ${e.message}`).join('\n');
        throw new Error(`Schema validation failed:\n${errorMessages}`);
      }

      return ast;
    }

    /**
     * Serialize a Canonical AST to YAML
     * @param {CanonicalAST} ast - The Canonical AST to serialize
     * @param {Object} options - Serialization options
     * @returns {string} YAML string
     */
    export function serializeToYAML(ast, options = {}) {
      const { includeMetadata = true, pretty = true } = options;

      // Get the data object
      let data = ast.toObject();

      // Update metadata timestamp if requested
      if (includeMetadata) {
        const now = new Date().toISOString();
        Iif (!data.metadata) {
          data.metadata = {
            created_at: now,
            updated_at: now
          };
        } else {
          Eif (!data.metadata.created_at) {
            data.metadata.created_at = now;
          }
          data.metadata.updated_at = now;
        }
      } else Eif (data.metadata) {
        // Remove metadata if not requested
        delete data.metadata;
      }

      // Serialize to YAML
      const dumpOptions = {
        indent: 2,
        lineWidth: -1, // No line wrapping
        noRefs: true,  // Don't use anchors/aliases
        sortKeys: false, // Preserve key order
        pretty
      };

      return yaml.dump(data, dumpOptions);
    }

    /**
     * Write a Canonical AST to a YAML file
     * @param {string} filePath - Path to write the file
     * @param {CanonicalAST} ast - The Canonical AST to write
     * @param {Object} options - Write options
     * @returns {Promise<void>}
     */
    export async function writeYAMLFile(filePath, ast, options = {}) {
      const { dryRun = false, backup = true } = options;

      // Create backup if file exists and backup requested
      if (backup && await fs.pathExists(filePath)) {
        const backupPath = `${filePath}.bak`;
        await fs.copy(filePath, backupPath, { overwrite: true });
      }

      // Serialize to YAML
      const yamlContent = serializeToYAML(ast, options);

      // Write or preview
      if (dryRun) {
        console.log(`[Dry Run] Would write to: ${filePath}`);
        console.log('---');
        console.log(yamlContent);
        console.log('---');
      } else {
        await fs.writeFile(filePath, yamlContent, 'utf8');
      }
    }

    /**
     * Create a minimal rosetta.yaml file
     * @param {string} filePath - Path to create the file
     * @param {Object} config - Configuration for the minimal file
     * @returns {Promise<CanonicalAST>} The created AST
     */
    export async function createMinimalYAML(filePath, config = {}) {
      const {
        projectName = 'my-project',
        projectType = 'web_app',
        language = 'TypeScript',
        description = `${projectName} project`
      } = config;

      const ast = CanonicalAST.createMinimal(projectName, projectType, language);
      ast.set('project.description', description);

      await writeYAMLFile(filePath, ast, { backup: false });

      return ast;
    }

    /**
     * Validate a rosetta.yaml file without parsing
     * @param {string} filePath - Path to the file
     * @returns {Promise<Object>} Validation result
     */
    export async function validateYAMLFile(filePath) {
      try {
        const content = await fs.readFile(filePath, 'utf8');
        const yamlObject = yaml.load(content);

        return validateYAML(yamlObject);
      } catch (error) {
        return {
          valid: false,
          errors: [{
            path: '(file)',
            property: 'file',
            keyword: 'file',
            message: error.message
          }]
        };
      }
    }

    /**
     * Check if a directory contains a rosetta.yaml file
     * @param {string} dirPath - Directory path
     * @returns {Promise<boolean>} True if rosetta.yaml exists
     */
    export async function hasRosettaYAML(dirPath) {
      const yamlPath = dirPath.endsWith('rosetta.yaml') ? dirPath : `${dirPath.replace(/\/$/, '')}/rosetta.yaml`;
      return fs.pathExists(yamlPath);
    }

    /**
     * Find rosetta.yaml in current or parent directories
     * @param {string} startDir - Directory to start searching from
     * @param {number} maxDepth - Maximum directories to search up
     * @returns {Promise<string|null>} Path to rosetta.yaml or null
     */
    export async function findRosettaYAML(startDir = process.cwd(), maxDepth = 5) {
      // Resolve startDir to its real path to avoid symlink inconsistencies
      let currentDir;
      try {
        currentDir = await fs.realpath(startDir);
      } catch {
        // If realpath fails (e.g., dir doesn't exist), use startDir as is
        currentDir = startDir;
      }

      for (let i = 0; i < maxDepth; i++) {
        const yamlPath = `${currentDir}/rosetta.yaml`;

        if (await fs.pathExists(yamlPath)) {
          return yamlPath;
        }

        // Move to parent directory
        const parentDir = `${currentDir}/..`;

        // Resolve to absolute path and check if we've reached root
        const resolvedParent = await fs.realpath(parentDir);
        const resolvedCurrent = await fs.realpath(currentDir);

        Iif (resolvedParent === resolvedCurrent) {
          break; // Reached filesystem root
        }

        currentDir = resolvedParent;
      }

      return null;
    }

    /**
     * Merge multiple YAML files
     * @param {Array<string>} filePaths - Array of file paths to merge
     * @param {string} strategy - Merge strategy
     * @returns {Promise<CanonicalAST>} Merged AST
     */
    export async function mergeYAMLFiles(filePaths, strategy = 'canonical') {
      if (filePaths.length === 0) {
        throw new Error('No files provided for merging');
      }

      // Parse first file as base
      let merged = await parseYAMLFile(filePaths[0]);

      // Merge remaining files
      for (let i = 1; i < filePaths.length; i++) {
        const nextAST = await parseYAMLFile(filePaths[i]);
        merged = merged.merge(nextAST, strategy);
      }

      return merged;
    }

    export default {
      parseYAMLFile,
      parseYAMLContent,
      serializeToYAML,
      writeYAMLFile,
      createMinimalYAML,
      validateYAMLFile,
      hasRosettaYAML,
      findRosettaYAML,
      mergeYAMLFiles
    };