# All files / lib/analyzers structure-analyzer.js

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     import fs from 'fs-extra';
    import path from 'path';
    import chalk from 'chalk';

    /**
     * Analyzes project directory layout and file organization.
     * Returns structure metadata for ideation scoring.
     */

    /**
     * Main function to analyze project structure.
     */
    export async function analyzeStructure(projectPath) {
      const structure = {
        // Basic layout
        layout: await detectLayoutPattern(projectPath),

        // Directory organization
        organization: await analyzeOrganization(projectPath),

        // File distribution
        distribution: await analyzeFileDistribution(projectPath),

        // Complexity indicators
        complexity: await assessComplexity(projectPath),

        // Best practices compliance
        bestPractices: await checkBestPractices(projectPath)
      };

      return structure;
    }

    /**
     * Detect overall layout pattern of the project.
     */
    async function detectLayoutPattern(projectPath) {
      const layout = {
        pattern: 'unknown',
        indicators: []
      };

      const entries = await fs.readdir(projectPath, { withFileTypes: true });
      const subdirs = entries.filter(e => e.isDirectory()).map(e => e.name);

      // Check for common layout patterns
      const hasSrc = subdirs.includes('src');
      const hasApp = subdirs.includes('app');
      const hasLib = subdirs.includes('lib');
      const hasComponents = subdirs.includes('components');
      const hasPages = subdirs.includes('pages');
      const hasTests = subdirs.some(d => d.includes('test') || d.includes('spec'));

      // Next.js app router
      if (hasApp && !hasSrc) {
        const appDir = path.join(projectPath, 'app');
        if (await fs.pathExists(appDir)) {
          const appContents = await fs.readdir(appDir);
          if (appContents.some(f => f.endsWith('.tsx') || f.endsWith('.ts'))) {
            layout.pattern = 'nextjs-app';
            layout.indicators.push('Next.js App Router layout');
            return layout;
          }
        }
      }

      // Next.js pages router
      if (hasPages && hasComponents) {
        layout.pattern = 'nextjs-pages';
        layout.indicators.push('Next.js Pages Router layout');
        return layout;
      }

      // Standard src-based layout
      if (hasSrc) {
        layout.pattern = 'src-based';
        layout.indicators.push('Source code in src/ directory');

        // Check for sub-organization within src
        const srcPath = path.join(projectPath, 'src');
        if (await fs.pathExists(srcPath)) {
          const srcContents = await fs.readdir(srcPath);
          if (srcContents.includes('components')) {
            layout.indicators.push('Components organized in src/components');
          }
          if (srcContents.includes('pages') || srcContents.includes('routes')) {
            layout.indicators.push('Routes organized in src/');
          }
          if (srcContents.includes('api')) {
            layout.indicators.push('API routes in src/api');
          }
        }
        return layout;
      }

      // App-based layout (common in older Node.js projects)
      if (hasApp && !hasSrc) {
        layout.pattern = 'app-based';
        layout.indicators.push('Source code in app/ directory');
        return layout;
      }

      // Lib-based layout (common in Ruby projects)
      if (hasLib) {
        layout.pattern = 'lib-based';
        layout.indicators.push('Source code in lib/ directory');
        return layout;
      }

      // Flat layout (everything at root)
      const sourceFiles = entries.filter(e => e.isFile()).filter(f => {
        const ext = path.extname(f.name).toLowerCase();
        return ['.js', '.ts', '.jsx', '.tsx', '.py', '.go', '.rs', '.rb'].includes(ext);
      });

      if (sourceFiles.length > 3) {
        layout.pattern = 'flat';
        layout.indicators.push('Flat layout with multiple root source files');
        return layout;
      }

      layout.pattern = 'minimal';
      layout.indicators.push('Minimal or new project');
      return layout;
    }

    /**
     * Analyze directory organization and structure.
     */
    async function analyzeOrganization(projectPath) {
      const organization = {
        depth: 0,
        branchingFactor: 0,
        hasLogicalGrouping: false,
        groupings: [],
        irregularities: []
      };

      // Calculate depth and branching
      const maxDepth = await calculateMaxDepth(projectPath, 0, 3); // Max depth 3 to avoid long scans
      organization.depth = maxDepth;

      // Count immediate subdirectories
      const entries = await fs.readdir(projectPath, { withFileTypes: true });
      const subdirs = entries.filter(e => e.isDirectory());
      organization.branchingFactor = subdirs.length;

      // Check for logical groupings
      const logicalGroups = [
        { pattern: /^src\/(components|pages|routes|views)$/, name: 'UI/View layer' },
        { pattern: /^src\/(models|entities|schemas)$/, name: 'Data models' },
        { pattern: /^src\/(controllers|handlers|actions)$/, name: 'Request handlers' },
        { pattern: /^src\/(services|business|domain)$/, name: 'Business logic' },
        { pattern: /^src\/(repositories|dao|db)$/, name: 'Data access' },
        { pattern: /^src\/(utils|helpers|common|shared)$/, name: 'Utilities' },
        { pattern: /^src\/(types|interfaces|dtos)$/, name: 'Type definitions' },
        { pattern: /^src\/(hooks|composables)$/, name: 'React hooks/composables' },
        { pattern: /^src\/(store|state|redux|context)$/, name: 'State management' },
        { pattern: /^(test|tests|spec|__tests__)$/, name: 'Test suite' },
        { pattern: /^(config|configuration)$/, name: 'Configuration' },
        { pattern: /^(migrations|db\/migrations)$/, name: 'Database migrations' }
      ];

      for (const group of logicalGroups) {
        const entries = await fs.readdir(projectPath, { withFileTypes: true });
        for (const entry of entries) {
          if (entry.isDirectory()) {
            const fullPath = path.join(projectPath, entry.name);
            const hasGrouping = await checkForPattern(fullPath, group.pattern);
            if (hasGrouping) {
              organization.hasLogicalGrouping = true;
              organization.groupings.push(group.name);
            }
          }
        }
      }

      // Check for irregularities (e.g., mixed languages, inconsistent naming)
      const dirEntries = await fs.readdir(projectPath, { withFileTypes: true });
      const allSubdirs = dirEntries.filter(e => e.isDirectory()).map(e => e.name);

      // Check for inconsistent naming (mix of kebab-case, camelCase, snake_case)
      const namingStyles = {
        kebab: allSubdirs.filter(d => /^[a-z]+(-[a-z]+)*$/.test(d)).length,
        camel: allSubdirs.filter(d => /^[a-z]+([A-Z][a-z]*)*$/.test(d)).length,
        snake: allSubdirs.filter(d => /^[a-z]+(_[a-z]+)*$/.test(d)).length
      };

      const dirNamingCounts = Object.values(namingStyles);
      const maxNamingCount = Math.max(...dirNamingCounts);
      const mixedNaming = dirNamingCounts.filter(c => c > 0).length > 1 && maxNamingCount < allSubdirs.length * 0.7;

      if (mixedNaming) {
        organization.irregularities.push('Mixed directory naming conventions');
      }

      // Check for node_modules at unusual locations (should be filtered out)
      const nodeModulesDepth = await findNodeModulesDepth(projectPath);
      if (nodeModulesDepth > 1) {
        organization.irregularities.push(`node_modules found at depth ${nodeModulesDepth}`);
      }

      return organization;
    }

    /**
     * Analyze file distribution across directories.
     */
    async function analyzeFileDistribution(projectPath) {
      const distribution = {
        totalFiles: 0,
        filesByExtension: {},
        filesByDirectory: {},
        largestDirectory: null,
        distributionPattern: 'unknown'
      };

      // Scan directories with depth limit
      const maxDepth = 3;
      const extensions = {};
      const dirCounts = {};

      await scanDirectoryForDistribution(projectPath, extensions, dirCounts, maxDepth, 0);

      distribution.filesByExtension = extensions;
      distribution.filesByDirectory = dirCounts;
      distribution.totalFiles = Object.values(dirCounts).reduce((sum, count) => sum + count, 0);

      // Find largest directory
      let maxCount = 0;
      for (const [dir, count] of Object.entries(dirCounts)) {
        if (count > maxCount) {
          maxCount = count;
          distribution.largestDirectory = dir;
        }
      }

      // Determine distribution pattern
      const dirCount = Object.keys(dirCounts).length;
      if (dirCount === 0) {
        distribution.distributionPattern = 'empty';
      } else if (dirCount <= 2) {
        distribution.distributionPattern = 'concentrated';
      } else if (dirCount <= 5) {
        distribution.distributionPattern = 'moderate';
      } else {
        distribution.distributionPattern = 'distributed';
      }

      return distribution;
    }

    /**
     * Assess project complexity based on structure.
     */
    async function assessComplexity(projectPath) {
      const complexity = {
        level: 'low',
        indicators: [],
        score: 0
      };

      const entries = await fs.readdir(projectPath, { withFileTypes: true });
      const subdirs = entries.filter(e => e.isDirectory());

      // Check number of top-level directories
      if (subdirs.length > 5) {
        complexity.score += 1;
        complexity.indicators.push('Many top-level directories');
      }

      // Check for nested directories
      const maxDepth = await calculateMaxDepth(projectPath, 0, 4);
      if (maxDepth >= 4) {
        complexity.score += 2;
        complexity.indicators.push(`Deep nesting (max depth: ${maxDepth})`);
      }

      // Check for multiple source directories
      const sourceDirs = subdirs.filter(d =>
        ['src', 'lib', 'app', 'source', 'code'].includes(d)
      );
      if (sourceDirs.length > 1) {
        complexity.score += 1;
        complexity.indicators.push('Multiple source directories');
      }

      // Check for configuration complexity
      const configFiles = entries.filter(e => e.isFile()).filter(f =>
        ['.json', '.yaml', '.yml', '.toml', '.ini', '.config.js', '.config.ts'].includes(path.extname(f.name))
      );
      if (configFiles.length > 3) {
        complexity.score += 1;
        complexity.indicators.push('Many configuration files');
      }

      // Check for build tools
      const buildFiles = entries.filter(e => e.isFile()).filter(f =>
        ['webpack.config.js', 'vite.config.js', 'rollup.config.js', 'tsconfig.json',
         'Makefile', 'CMakeLists.txt', 'build.gradle'].includes(f.name)
      );
      if (buildFiles.length > 0) {
        complexity.score += 1;
        complexity.indicators.push('Custom build configuration');
      }

      // Determine complexity level
      if (complexity.score >= 4) {
        complexity.level = 'high';
      } else if (complexity.score >= 2) {
        complexity.level = 'medium';
      } else {
        complexity.level = 'low';
      }

      return complexity;
    }

    /**
     * Check for common best practices in project structure.
     */
    async function checkBestPractices(projectPath) {
      const bestPractices = {
        follows: [],
        violations: [],
        score: 0
      };

      const entries = await fs.readdir(projectPath, { withFileTypes: true });
      const subdirs = entries.filter(e => e.isDirectory()).map(e => e.name);

      // Check for test directory
      const hasTests = subdirs.some(d => d.includes('test') || d.includes('spec'));
      if (hasTests) {
        bestPractices.follows.push('Has dedicated test directory');
        bestPractices.score += 1;
      } else {
        bestPractices.violations.push('No dedicated test directory');
      }

      // Check for README
      const hasReadme = entries.some(e => e.isFile() && e.name.toLowerCase().includes('readme'));
      if (hasReadme) {
        bestPractices.follows.push('Has README');
        bestPractices.score += 1;
      }

      // Check for .gitignore
      const hasGitignore = entries.some(e => e.isFile() && e.name === '.gitignore');
      if (hasGitignore) {
        bestPractices.follows.push('Has .gitignore');
        bestPractices.score += 1;
      }

      // Check for separate src directory
      if (subdirs.includes('src')) {
        bestPractices.follows.push('Uses src/ for source code');
        bestPractices.score += 1;
      } else {
        // Check if there are many source files at root (potential violation)
        const sourceFiles = entries.filter(e => e.isFile()).filter(f => {
          const ext = path.extname(f.name).toLowerCase();
          return ['.js', '.ts', '.jsx', '.tsx', '.py', '.go', '.rs'].includes(ext);
        });
        if (sourceFiles.length > 5) {
          bestPractices.violations.push('Many source files at root (consider using src/)');
        }
      }

      // Check for environment files
      const hasEnv = entries.some(e => e.isFile() && e.name.startsWith('.env'));
      if (hasEnv) {
        bestPractices.follows.push('Has environment configuration');
        bestPractices.score += 1;
      }

      // Check for documentation directory
      if (subdirs.includes('docs') || subdirs.includes('documentation')) {
        bestPractices.follows.push('Has documentation directory');
        bestPractices.score += 1;
      }

      return bestPractices;
    }

    /**
     * Helper: Calculate maximum directory depth.
     */
    async function calculateMaxDepth(dirPath, currentDepth, maxDepth) {
      if (currentDepth >= maxDepth) return currentDepth;

      try {
        const entries = await fs.readdir(dirPath, { withFileTypes: true });
        const subdirs = entries.filter(e => e.isDirectory());

        if (subdirs.length === 0) return currentDepth;

        let maxChildDepth = currentDepth;
        for (const subdir of subdirs.slice(0, 10)) { // Limit to 10 subdirs to avoid long scans
          if (['node_modules', '.git', 'dist', 'build', '.next'].includes(subdir.name)) continue;

          const childDepth = await calculateMaxDepth(
            path.join(dirPath, subdir.name),
            currentDepth + 1,
            maxDepth
          );
          maxChildDepth = Math.max(maxChildDepth, childDepth);
        }

        return maxChildDepth;
      } catch (err) {
        return currentDepth;
      }
    }

    /**
     * Helper: Check if directory contains files matching pattern.
     */
    async function checkForPattern(dirPath, pattern) {
      try {
        const entries = await fs.readdir(dirPath, { withFileTypes: true });

        for (const entry of entries) {
          const entryPath = path.join(dirPath, entry.name);
          const relativePath = path.relative(process.cwd(), entryPath);

          if (pattern.test(relativePath)) {
            return true;
          }
          if (entry.isDirectory()) {
            const found = await checkForPattern(entryPath, pattern);
            if (found) return true;
          }
        }
      } catch (err) {
        // Ignore errors
      }

      return false;
    }

    /**
     * Helper: Scan directory for file distribution.
     */
    async function scanDirectoryForDistribution(dirPath, extensions, dirCounts, maxDepth, currentDepth) {
      if (currentDepth >= maxDepth) return;

      try {
        const entries = await fs.readdir(dirPath, { withFileTypes: true });

        for (const entry of entries) {
          if (entry.isDirectory()) {
            // Skip common directories to avoid long scans
            if (['node_modules', '.git', 'dist', 'build', '.next', 'coverage', '__pycache__'].includes(entry.name)) {
              continue;
            }
            await scanDirectoryForDistribution(path.join(dirPath, entry.name), extensions, dirCounts, maxDepth, currentDepth + 1);
          } else if (entry.isFile()) {
            const ext = path.extname(entry.name).toLowerCase();
            if (ext) {
              extensions[ext] = (extensions[ext] || 0) + 1;
            }

            // Count files per directory
            const relDir = path.relative(process.cwd(), dirPath);
            dirCounts[relDir] = (dirCounts[relDir] || 0) + 1;
          }
        }
      } catch (err) {
        // Skip directories we can't read
      }
    }

    /**
     * Helper: Find depth of node_modules.
     */
    async function findNodeModulesDepth(dirPath, currentDepth = 0) {
      if (currentDepth > 5) return -1; // Don't search too deep

      try {
        const entries = await fs.readdir(dirPath, { withFileTypes: true });

        for (const entry of entries) {
          if (entry.isDirectory() && entry.name === 'node_modules') {
            return currentDepth;
          }
        }

        for (const entry of entries) {
          if (entry.isDirectory() && !['node_modules', '.git', 'dist', 'build'].includes(entry.name)) {
            const found = await findNodeModulesDepth(path.join(dirPath, entry.name), currentDepth + 1);
            if (found >= 0) return found;
          }
        }
      } catch (err) {
        // Ignore errors
      }

      return -1;
    }