# All files / lib/analyzers code-pattern-analyzer.js

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

    /**
     * Analyzes codebase patterns, file structures, and architecture indicators.
     * Returns structured pattern data for ideation scoring.
     */

    /**
     * Main function to analyze codebase patterns.
     */
    export async function analyzeCodePatterns(projectPath) {
      const patterns = {
        // File patterns
        hasPackageJson: await fs.pathExists(path.join(projectPath, 'package.json')),
        hasGoMod: await fs.pathExists(path.join(projectPath, 'go.mod')),
        hasCargoToml: await fs.pathExists(path.join(projectPath, 'Cargo.toml')),
        hasRequirementsTxt: await fs.pathExists(path.join(projectPath, 'requirements.txt')),
        hasPyprojectToml: await fs.pathExists(path.join(projectPath, 'pyproject.toml')),
        hasGemfile: await fs.pathExists(path.join(projectPath, 'Gemfile')),

        // Directory patterns
        directories: await detectDirectoryStructure(projectPath),

        // Architecture patterns
        architecture: await detectArchitecturePatterns(projectPath),

        // Testing patterns
        testing: await detectTestingPatterns(projectPath),

        // Source file patterns
        sourceFiles: await detectSourcePatterns(projectPath)
      };

      return patterns;
    }

    /**
     * Detect directory structure patterns.
     */
    async function detectDirectoryStructure(projectPath) {
      const directories = {};

      const checkDir = async (dirName) => {
        const dirPath = path.join(projectPath, dirName);
        return await fs.pathExists(dirPath);
      };

      const checkDirs = async (dirNames) => {
        for (const dir of dirNames) {
          if (await checkDir(dir)) {
            return dir;
          }
        }
        return null;
      };

      // Common directory patterns
      directories.tests = await checkDirs(['tests', 'test', '__tests__', '__test__', 'spec']);
      directories.src = await checkDirs(['src', 'source', 'app']);
      directories.lib = await checkDir('lib');
      directories.api = await checkDirs(['api', 'src/api', 'app/api']);
      directories.components = await checkDirs(['components', 'src/components', 'app/components']);
      directories.pages = await checkDirs(['pages', 'src/pages', 'app/pages']);
      directories.hooks = await checkDirs(['hooks', 'src/hooks']);
      directories.utils = await checkDirs(['utils', 'src/utils', 'lib/utils']);
      directories.models = await checkDirs(['models', 'src/models', 'app/models']);
      directories.controllers = await checkDirs(['controllers', 'src/controllers', 'app/controllers']);
      directories.routes = await checkDirs(['routes', 'src/routes', 'app/routes']);
      directories.middlewares = await checkDirs(['middleware', 'src/middleware', 'app/middleware']);
      directories.services = await checkDirs(['services', 'src/services', 'app/services']);
      directories.repositories = await checkDirs(['repositories', 'src/repositories', 'app/repositories']);
      directories.migrations = await checkDirs(['migrations', 'db/migrations', 'prisma/migrations']);
      directories.seeds = await checkDirs(['seeds', 'db/seeds', 'prisma/seeds']);
      directories.public = await checkDir('public');
      directories.static = await checkDirs(['static', 'public/static']);
      directories.config = await checkDirs(['config', 'src/config', '.config']);
      directories.docker = await checkDir('docker');
      directories.cicd = await checkDirs(['.github', '.gitlab-ci', '.circleci', 'scripts']);
      directories.infrastructure = await checkDirs(['infrastructure', 'infra', 'terraform', 'k8s']);

      return directories;
    }

    /**
     * Detect architecture patterns from file structure.
     */
    async function detectArchitecturePatterns(projectPath) {
      const architecture = {
        pattern: 'unknown',
        indicators: []
      };

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

      // Detect monorepo
      if (subdirs.includes('packages') || subdirs.includes('apps') || subdirs.includes('services')) {
        architecture.pattern = 'monorepo';
        architecture.indicators.push('Has packages/ or apps/ directory');
      }

      // Detect Next.js app router
      const appDir = path.join(projectPath, 'app');
      if (await fs.pathExists(appDir)) {
        const appContents = await fs.readdir(appDir, { withFileTypes: true });
        if (appContents.some(e => e.name.endsWith('.tsx') || e.name.endsWith('.ts'))) {
          architecture.pattern = 'nextjs-app-router';
          architecture.indicators.push('App router structure detected');
        }
      }

      // Detect pages router
      const pagesDir = path.join(projectPath, 'pages');
      if (await fs.pathExists(pagesDir)) {
        const pagesContents = await fs.readdir(pagesDir, { withFileTypes: true });
        if (pagesContents.some(e => e.name.endsWith('.tsx') || e.name.endsWith('.ts') || e.name.endsWith('.jsx') || e.name.endsWith('.js'))) {
          if (architecture.pattern === 'unknown') {
            architecture.pattern = 'nextjs-pages-router';
            architecture.indicators.push('Pages router structure detected');
          }
        }
      }

      // Detect MVC pattern
      const hasModels = await fs.pathExists(path.join(projectPath, 'models')) ||
                        await fs.pathExists(path.join(projectPath, 'src/models')) ||
                        await fs.pathExists(path.join(projectPath, 'app/models'));
      const hasViews = await fs.pathExists(path.join(projectPath, 'views')) ||
                       await fs.pathExists(path.join(projectPath, 'src/views'));
      const hasControllers = await fs.pathExists(path.join(projectPath, 'controllers')) ||
                             await fs.pathExists(path.join(projectPath, 'src/controllers')) ||
                             await fs.pathExists(path.join(projectPath, 'app/controllers'));

      if (hasModels && hasViews && hasControllers) {
        architecture.pattern = 'mvc';
        architecture.indicators.push('MVC structure detected');
      }

      // Detect layered architecture
      const hasServices = await fs.pathExists(path.join(projectPath, 'services')) ||
                          await fs.pathExists(path.join(projectPath, 'src/services'));
      const hasRepositories = await fs.pathExists(path.join(projectPath, 'repositories')) ||
                              await fs.pathExists(path.join(projectPath, 'src/repositories'));

      if (hasServices || hasRepositories) {
        if (architecture.pattern === 'unknown') {
          architecture.pattern = 'layered';
          architecture.indicators.push('Layered architecture detected');
        }
      }

      // Detect microservices
      if (subdirs.filter(d => d.startsWith('service-') || d.startsWith('svc-')).length >= 2) {
        architecture.pattern = 'microservices';
        architecture.indicators.push('Multiple service directories detected');
      }

      return architecture;
    }

    /**
     * Detect testing patterns and frameworks.
     */
    async function detectTestingPatterns(projectPath) {
      const testing = {
        hasTests: false,
        frameworks: [],
        structure: 'none',
        indicators: []
      };

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

      // Check for test directories
      const testDirs = subdirs.filter(d => d.includes('test') || d.includes('spec'));
      if (testDirs.length > 0) {
        testing.hasTests = true;
        testing.structure = testDirs[0];
        testing.indicators.push(`Test directory: ${testDirs[0]}`);
      }

      // Scan for test files (limited depth to avoid long scans)
      const testFilePatterns = [
        '*.test.js', '*.test.ts', '*.test.tsx',
        '*.spec.js', '*.spec.ts', '*.spec.tsx',
        '*_test.js', '*_test.ts', '*_test.tsx',
        '*_spec.js', '*_spec.ts', '*_spec.tsx'
      ];

      // Quick scan of root and immediate subdirectories
      const searchDirs = ['.', 'src', 'lib', 'app', ...subdirs.slice(0, 5)];

      for (const dir of searchDirs) {
        const dirPath = path.join(projectPath, dir);
        if (!await fs.pathExists(dirPath)) continue;

        try {
          const files = await fs.readdir(dirPath);
          const testFiles = files.filter(f =>
            testFilePatterns.some(pattern => f.match(pattern.replace('*', '.*')))
          );

          if (testFiles.length > 0) {
            testing.hasTests = true;
            testing.indicators.push(`${testFiles.length} test file(s) in ${dir}`);
            break;
          }
        } catch (err) {
          // Skip directories we can't read
        }
      }

      // Check for test framework indicators
      const packageJsonPath = path.join(projectPath, 'package.json');
      if (await fs.pathExists(packageJsonPath)) {
        try {
          const pkg = await fs.readJson(packageJsonPath);
          const deps = { ...pkg.dependencies, ...pkg.devDependencies };

          if (deps.jest || deps['@jest/globals']) testing.frameworks.push('jest');
          if (deps.mocha) testing.frameworks.push('mocha');
          if (deps.chai) testing.frameworks.push('chai');
          if (deps.vitest) testing.frameworks.push('vitest');
          if (deps['@playwright/test']) testing.frameworks.push('playwright');
          if (deps.cypress) testing.frameworks.push('cypress');
          if (deps['@testing-library/react']) testing.frameworks.push('testing-library');
          if (deps['@testing-library/vue']) testing.frameworks.push('testing-library');
          if (deps.jasmine) testing.frameworks.push('jasmine');
          if (deps['@supertest/supertest']) testing.frameworks.push('supertest');
        } catch (err) {
          // Ignore parse errors
        }
      }

      // Check for Python test files
      const testPyPattern = /test_.*\.py$/;
      for (const dir of searchDirs) {
        const dirPath = path.join(projectPath, dir);
        if (!await fs.pathExists(dirPath)) continue;

        try {
          const files = await fs.readdir(dirPath);
          const testFiles = files.filter(f => testPyPattern.test(f));

          if (testFiles.length > 0) {
            testing.hasTests = true;
            if (!testing.frameworks.includes('pytest')) {
              testing.frameworks.push('pytest');
            }
            testing.indicators.push(`Python test files in ${dir}`);
            break;
          }
        } catch (err) {
          // Skip directories we can't read
        }
      }

      // Check for Go test files
      const testGoPattern = /_test\.go$/;
      for (const dir of searchDirs) {
        const dirPath = path.join(projectPath, dir);
        if (!await fs.pathExists(dirPath)) continue;

        try {
          const files = await fs.readdir(dirPath);
          const testFiles = files.filter(f => testGoPattern.test(f));

          if (testFiles.length > 0) {
            testing.hasTests = true;
            testing.frameworks.push('go-testing');
            testing.indicators.push(`Go test files in ${dir}`);
            break;
          }
        } catch (err) {
          // Skip directories we can't read
        }
      }

      return testing;
    }

    /**
     * Detect source file patterns and languages.
     */
    async function detectSourcePatterns(projectPath) {
      const sourceFiles = {
        languages: [],
        fileCounts: {},
        indicators: []
      };

      const languageExtensions = {
        javascript: ['.js', '.jsx', '.mjs', '.cjs'],
        typescript: ['.ts', '.tsx'],
        python: ['.py'],
        go: ['.go'],
        rust: ['.rs'],
        ruby: ['.rb'],
        java: ['.java'],
        csharp: ['.cs'],
        php: ['.php'],
        html: ['.html', '.htm'],
        css: ['.css', '.scss', '.sass', '.less'],
        sql: ['.sql'],
        yaml: ['.yml', '.yaml'],
        json: ['.json'],
        markdown: ['.md']
      };

      // Quick scan of common source directories
      const searchDirs = ['src', 'lib', 'app', 'components', 'pages', 'models', 'controllers', 'services'];

      for (const dir of searchDirs) {
        const dirPath = path.join(projectPath, dir);
        if (!await fs.pathExists(dirPath)) continue;

        try {
          await scanDirectory(dirPath, sourceFiles, languageExtensions, 2); // Max depth 2
          if (Object.keys(sourceFiles.fileCounts).length > 0) break;
        } catch (err) {
          // Skip directories we can't read
        }
      }

      // Also scan root directory for source files
      try {
        const rootFiles = await fs.readdir(projectPath);
        const rootSourceFiles = rootFiles.filter(f => {
          const ext = path.extname(f).toLowerCase();
          return Object.values(languageExtensions).flat().includes(ext);
        });

        rootSourceFiles.forEach(f => {
          const ext = path.extname(f).toLowerCase();
          for (const [lang, exts] of Object.entries(languageExtensions)) {
            if (exts.includes(ext)) {
              sourceFiles.fileCounts[lang] = (sourceFiles.fileCounts[lang] || 0) + 1;
              break;
            }
          }
        });
      } catch (err) {
        // Ignore scan errors
      }

      // Determine primary languages
      const sortedLanguages = Object.entries(sourceFiles.fileCounts)
        .sort((a, b) => b[1] - a[1])
        .map(([lang]) => lang);

      sourceFiles.languages = sortedLanguages;

      if (sortedLanguages.length > 0) {
        sourceFiles.indicators.push(`Primary language: ${sortedLanguages[0]}`);
        if (sortedLanguages.length > 1) {
          sourceFiles.indicators.push(`Secondary languages: ${sortedLanguages.slice(1).join(', ')}`);
        }
      }

      return sourceFiles;
    }

    /**
     * Helper: Recursively scan directory for source files.
     */
    async function scanDirectory(dirPath, sourceFiles, languageExtensions, maxDepth, currentDepth = 0) {
      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 scanDirectory(path.join(dirPath, entry.name), sourceFiles, languageExtensions, maxDepth, currentDepth + 1);
          } else if (entry.isFile()) {
            const ext = path.extname(entry.name).toLowerCase();
            for (const [lang, exts] of Object.entries(languageExtensions)) {
              if (exts.includes(ext)) {
                sourceFiles.fileCounts[lang] = (sourceFiles.fileCounts[lang] || 0) + 1;
                break;
              }
            }
          }
        }
      } catch (err) {
        // Skip directories we can't read
      }
    }