import * as fs from 'node:fs';
import * as path from 'node:path';
import { execSync } from 'node:child_process';
/**
 * Default directories to exclude from scanning.
 */
export const DEFAULT_IGNORE_DIRS = [
    'node_modules',
    '.git',
    'dist',
    'build',
    'vendor',
    '__pycache__',
    '.next',
    '.cache',
    '.turbo',
    'target',
    'obj',
    '.understand-anything',
];
/**
 * Default file patterns to exclude from scanning (binary, generated, lock files).
 */
export const DEFAULT_IGNORE_FILE_PATTERNS = [
    '*.lock',
    '*.min.js',
    '*.min.css',
    '*.map',
    '*.png',
    '*.jpg',
    '*.jpeg',
    '*.gif',
    '*.svg',
    '*.ico',
    '*.woff',
    '*.woff2',
    '*.ttf',
    '*.eot',
    '*.mp3',
    '*.mp4',
    '*.webm',
    '*.zip',
    '*.tar',
    '*.gz',
    '*.pdf',
    '*.exe',
    '*.dll',
    '*.so',
    '*.dylib',
];
/**
 * Extension-to-language mapping.
 */
const EXTENSION_LANGUAGE_MAP = {
    '.ts': 'typescript',
    '.tsx': 'typescript',
    '.js': 'javascript',
    '.jsx': 'javascript',
    '.mjs': 'javascript',
    '.cjs': 'javascript',
    '.py': 'python',
    '.go': 'go',
    '.rs': 'rust',
    '.java': 'java',
    '.rb': 'ruby',
    '.php': 'php',
    '.cs': 'csharp',
    '.cpp': 'cpp',
    '.cc': 'cpp',
    '.cxx': 'cpp',
    '.c': 'c',
    '.h': 'c',
    '.hpp': 'cpp',
    '.swift': 'swift',
    '.kt': 'kotlin',
    '.sh': 'shell',
    '.bash': 'shell',
    '.sql': 'sql',
    '.html': 'html',
    '.htm': 'html',
    '.css': 'css',
    '.scss': 'css',
    '.less': 'css',
    '.json': 'json',
    '.yaml': 'yaml',
    '.yml': 'yaml',
    '.md': 'markdown',
    '.xml': 'xml',
    '.toml': 'toml',
    '.graphql': 'graphql',
    '.gql': 'graphql',
    '.proto': 'protobuf',
    '.tf': 'terraform',
    '.ps1': 'powershell',
    '.bat': 'batch',
    '.cmd': 'batch',
    '.txt': 'text',
    '.rst': 'restructuredtext',
    '.adoc': 'asciidoc',
    '.env': 'env',
    '.ini': 'ini',
    '.cfg': 'ini',
};
/**
 * Extension-to-category mapping.
 */
const EXTENSION_CATEGORY_MAP = {
    // code
    '.ts': 'code',
    '.tsx': 'code',
    '.js': 'code',
    '.jsx': 'code',
    '.mjs': 'code',
    '.cjs': 'code',
    '.py': 'code',
    '.go': 'code',
    '.rs': 'code',
    '.java': 'code',
    '.rb': 'code',
    '.php': 'code',
    '.cs': 'code',
    '.cpp': 'code',
    '.cc': 'code',
    '.cxx': 'code',
    '.c': 'code',
    '.h': 'code',
    '.hpp': 'code',
    '.swift': 'code',
    '.kt': 'code',
    // config
    '.json': 'config',
    '.yaml': 'config',
    '.yml': 'config',
    '.toml': 'config',
    '.xml': 'config',
    '.env': 'config',
    '.ini': 'config',
    '.cfg': 'config',
    // docs
    '.md': 'docs',
    '.txt': 'docs',
    '.rst': 'docs',
    '.adoc': 'docs',
    // infra
    '.tf': 'infra',
    // data
    '.sql': 'data',
    '.graphql': 'data',
    '.gql': 'data',
    '.proto': 'data',
    // script
    '.sh': 'script',
    '.bash': 'script',
    '.ps1': 'script',
    '.bat': 'script',
    '.cmd': 'script',
    // markup
    '.html': 'markup',
    '.htm': 'markup',
    '.css': 'markup',
    '.scss': 'markup',
    '.less': 'markup',
    '.svg': 'markup',
};
/**
 * Filenames that indicate infra category regardless of extension.
 */
const INFRA_FILENAMES = [
    'dockerfile',
    'docker-compose.yml',
    'docker-compose.yaml',
];
/**
 * Reads the .understand-anything/.understandignore file and returns patterns.
 * Returns an empty array if the file doesn't exist.
 */
function readUnderstandIgnore(projectRoot) {
    const ignorePath = path.join(projectRoot, '.understand-anything', '.understandignore');
    try {
        const content = fs.readFileSync(ignorePath, 'utf-8');
        return content
            .split('\n')
            .map(line => line.trim())
            .filter(line => line.length > 0 && !line.startsWith('#'));
    }
    catch {
        return [];
    }
}
/**
 * Checks if a filename matches a glob pattern (simple glob: supports * wildcard).
 */
function matchesGlobPattern(filename, pattern) {
    // Convert glob pattern to regex
    const escaped = pattern
        .replace(/[.+^${}()|[\]\\]/g, '\\$&')
        .replace(/\*/g, '.*')
        .replace(/\?/g, '.');
    const regex = new RegExp(`^${escaped}$`, 'i');
    return regex.test(filename);
}
/**
 * Checks if a relative path matches a glob pattern that may include directory separators.
 */
function matchesPathPattern(relativePath, pattern) {
    // Normalize separators
    const normalizedPath = relativePath.replace(/\\/g, '/');
    const normalizedPattern = pattern.replace(/\\/g, '/');
    // If pattern contains a slash, match against the full relative path
    if (normalizedPattern.includes('/')) {
        const escaped = normalizedPattern
            .replace(/[.+^${}()|[\]\\]/g, '\\$&')
            .replace(/\*\*/g, '{{GLOBSTAR}}')
            .replace(/\*/g, '[^/]*')
            .replace(/\{\{GLOBSTAR\}\}/g, '.*')
            .replace(/\?/g, '.');
        const regex = new RegExp(`^${escaped}$`, 'i');
        // Also try matching as a prefix (for directory patterns like "src/generated/**")
        if (regex.test(normalizedPath)) {
            return true;
        }
        // If pattern ends with /**, also match the directory itself
        if (normalizedPattern.endsWith('/**')) {
            const dirPrefix = normalizedPattern.slice(0, -3);
            if (normalizedPath.startsWith(dirPrefix + '/') || normalizedPath === dirPrefix) {
                return true;
            }
        }
        return false;
    }
    // Otherwise match against just the filename
    return matchesGlobPattern(path.basename(relativePath), normalizedPattern);
}
/**
 * Determines if a file should be excluded based on ignore patterns.
 */
function shouldExcludeFile(relativePath, filename, ignorePatterns) {
    // Check default file patterns
    for (const pattern of DEFAULT_IGNORE_FILE_PATTERNS) {
        if (matchesGlobPattern(filename, pattern)) {
            return true;
        }
    }
    // Check custom ignore patterns
    for (const pattern of ignorePatterns) {
        if (matchesPathPattern(relativePath, pattern)) {
            return true;
        }
    }
    return false;
}
/**
 * Detects the language of a file from its extension or filename.
 */
function detectLanguage(filePath) {
    const basename = path.basename(filePath).toLowerCase();
    // Special filename-based detection
    if (basename === 'dockerfile' || basename.startsWith('dockerfile.')) {
        return 'dockerfile';
    }
    const ext = path.extname(filePath).toLowerCase();
    return EXTENSION_LANGUAGE_MAP[ext] || 'unknown';
}
/**
 * Detects the category of a file based on its extension and path.
 */
function detectCategory(filePath) {
    const basename = path.basename(filePath).toLowerCase();
    const ext = path.extname(filePath).toLowerCase();
    // Special filename-based detection for infra
    if (INFRA_FILENAMES.includes(basename)) {
        return 'infra';
    }
    // Dockerfile without extension
    if (basename === 'dockerfile' || basename.startsWith('dockerfile.')) {
        return 'infra';
    }
    // Check path patterns for infra (e.g., .k8s, .helm directories)
    const normalizedPath = filePath.replace(/\\/g, '/');
    if (normalizedPath.includes('.k8s/') || normalizedPath.includes('.helm/') ||
        normalizedPath.includes('k8s/') || normalizedPath.includes('helm/')) {
        return 'infra';
    }
    return EXTENSION_CATEGORY_MAP[ext] || 'code';
}
/**
 * Counts the number of lines in a file.
 */
function countLines(filePath) {
    try {
        const content = fs.readFileSync(filePath, 'utf-8');
        if (content.length === 0)
            return 0;
        return content.split('\n').length;
    }
    catch {
        return 0;
    }
}
/**
 * Recursively scans a directory for files, respecting ignore patterns.
 */
function scanDirectory(dirPath, projectRoot, ignorePatterns, files) {
    let entries;
    try {
        entries = fs.readdirSync(dirPath, { withFileTypes: true });
    }
    catch {
        return;
    }
    for (const entry of entries) {
        const fullPath = path.join(dirPath, entry.name);
        const relativePath = path.relative(projectRoot, fullPath);
        if (entry.isDirectory()) {
            // Skip excluded directories
            if (DEFAULT_IGNORE_DIRS.includes(entry.name)) {
                continue;
            }
            // Check if directory matches any ignore pattern
            const relDirPath = relativePath.replace(/\\/g, '/');
            let skipDir = false;
            for (const pattern of ignorePatterns) {
                if (matchesPathPattern(relDirPath, pattern) || matchesPathPattern(relDirPath + '/', pattern)) {
                    skipDir = true;
                    break;
                }
            }
            if (skipDir)
                continue;
            scanDirectory(fullPath, projectRoot, ignorePatterns, files);
        }
        else if (entry.isFile()) {
            const relFilePath = relativePath.replace(/\\/g, '/');
            // Check if file should be excluded
            if (shouldExcludeFile(relFilePath, entry.name, ignorePatterns)) {
                continue;
            }
            const language = detectLanguage(fullPath);
            const category = detectCategory(relFilePath);
            const lineCount = countLines(fullPath);
            files.push({
                path: fullPath,
                relativePath: relFilePath,
                category,
                language,
                lineCount,
            });
        }
    }
}
/**
 * Framework detection patterns based on config file names.
 */
const FRAMEWORK_FILE_PATTERNS = [
    { pattern: 'next.config', framework: 'Next.js' },
    { pattern: 'nuxt.config', framework: 'Nuxt' },
    { pattern: 'angular.json', framework: 'Angular' },
    { pattern: 'svelte.config', framework: 'Svelte' },
    { pattern: 'astro.config', framework: 'Astro' },
    { pattern: 'vite.config', framework: 'Vite' },
    { pattern: 'webpack.config', framework: 'Webpack' },
    { pattern: 'tailwind.config', framework: 'TailwindCSS' },
    { pattern: 'manage.py', framework: 'Django' },
];
/**
 * Framework detection from package.json dependencies.
 */
const DEPENDENCY_FRAMEWORK_MAP = {
    'react': 'React',
    'vue': 'Vue',
    '@angular/core': 'Angular',
    'next': 'Next.js',
    'express': 'Express',
    'fastify': 'Fastify',
    '@nestjs/core': 'NestJS',
    'astro': 'Astro',
    'svelte': 'Svelte',
    'nuxt': 'Nuxt',
    'vite': 'Vite',
};
/**
 * Framework detection from Python dependencies.
 */
const PYTHON_FRAMEWORK_MAP = {
    'django': 'Django',
    'flask': 'Flask',
    'fastapi': 'FastAPI',
};
/**
 * Reads a file safely, returning null on failure.
 */
function readFileSafe(filePath) {
    try {
        return fs.readFileSync(filePath, 'utf-8');
    }
    catch {
        return null;
    }
}
/**
 * Extracts a simple value from a TOML file using regex.
 * Handles both quoted and unquoted values.
 */
function extractTomlValue(content, section, key) {
    // Find the section
    const sectionRegex = new RegExp(`\\[${section.replace('.', '\\.')}\\]`);
    const sectionMatch = content.match(sectionRegex);
    if (!sectionMatch || sectionMatch.index === undefined)
        return '';
    // Get content after section header until next section
    const afterSection = content.slice(sectionMatch.index + sectionMatch[0].length);
    const nextSectionIdx = afterSection.search(/^\[/m);
    const sectionContent = nextSectionIdx >= 0 ? afterSection.slice(0, nextSectionIdx) : afterSection;
    // Find the key
    const keyRegex = new RegExp(`^${key}\\s*=\\s*"([^"]*)"`, 'm');
    const keyMatch = sectionContent.match(keyRegex);
    return keyMatch ? keyMatch[1] : '';
}
/**
 * Extracts dependencies list from a TOML section (pyproject.toml).
 */
function extractTomlDependencies(content) {
    // Look for dependencies in [project] section
    const depsRegex = /\[project\][\s\S]*?dependencies\s*=\s*\[([\s\S]*?)\]/;
    const match = content.match(depsRegex);
    if (!match)
        return [];
    // Extract package names from the array
    return match[1]
        .split('\n')
        .map(line => line.trim().replace(/^["']/, '').replace(/["'].*$/, ''))
        .filter(line => line.length > 0 && !line.startsWith('#'))
        .map(dep => dep.split(/[>=<!\s]/)[0].toLowerCase());
}
/**
 * Detects project metadata from manifest files and scanned file entries.
 */
export function detectMetadata(projectRoot, files) {
    let name = '';
    let description = '';
    const detectedFrameworks = new Set();
    // 1. Try package.json first (highest priority)
    const packageJsonContent = readFileSafe(path.join(projectRoot, 'package.json'));
    if (packageJsonContent) {
        try {
            const pkg = JSON.parse(packageJsonContent);
            name = pkg.name || '';
            description = pkg.description || '';
            // Detect frameworks from dependencies
            const allDeps = {
                ...(pkg.dependencies || {}),
                ...(pkg.devDependencies || {}),
            };
            for (const [depName, framework] of Object.entries(DEPENDENCY_FRAMEWORK_MAP)) {
                if (depName in allDeps) {
                    detectedFrameworks.add(framework);
                }
            }
            // Detect TypeScript from dependencies
            if ('typescript' in allDeps || Object.keys(allDeps).some(d => d.startsWith('@types/'))) {
                // TypeScript is detected as a language, not a framework — handled in language detection
            }
        }
        catch {
            // Invalid JSON, skip
        }
    }
    // 2. Try pyproject.toml
    if (!name) {
        const pyprojectContent = readFileSafe(path.join(projectRoot, 'pyproject.toml'));
        if (pyprojectContent) {
            name = extractTomlValue(pyprojectContent, 'project', 'name');
            description = extractTomlValue(pyprojectContent, 'project', 'description');
            // Detect Python frameworks from dependencies
            const deps = extractTomlDependencies(pyprojectContent);
            for (const [depName, framework] of Object.entries(PYTHON_FRAMEWORK_MAP)) {
                if (deps.some(d => d === depName || d.startsWith(depName + '['))) {
                    detectedFrameworks.add(framework);
                }
            }
        }
    }
    // 3. Try Cargo.toml
    if (!name) {
        const cargoContent = readFileSafe(path.join(projectRoot, 'Cargo.toml'));
        if (cargoContent) {
            name = extractTomlValue(cargoContent, 'package', 'name');
            description = extractTomlValue(cargoContent, 'package', 'description');
        }
    }
    // 4. Try go.mod
    if (!name) {
        const goModContent = readFileSafe(path.join(projectRoot, 'go.mod'));
        if (goModContent) {
            const moduleMatch = goModContent.match(/^module\s+(.+)$/m);
            if (moduleMatch) {
                name = moduleMatch[1].trim();
            }
        }
    }
    // 5. Try pom.xml
    if (!name) {
        const pomContent = readFileSafe(path.join(projectRoot, 'pom.xml'));
        if (pomContent) {
            const artifactIdMatch = pomContent.match(/<artifactId>([^<]+)<\/artifactId>/);
            const nameMatch = pomContent.match(/<name>([^<]+)<\/name>/);
            name = nameMatch ? nameMatch[1] : (artifactIdMatch ? artifactIdMatch[1] : '');
            const descMatch = pomContent.match(/<description>([^<]+)<\/description>/);
            description = descMatch ? descMatch[1] : '';
        }
    }
    // 6. Detect languages from scanned files
    const languageCounts = new Map();
    for (const file of files) {
        if (file.language && file.language !== 'unknown') {
            languageCounts.set(file.language, (languageCounts.get(file.language) || 0) + 1);
        }
    }
    // Sort by frequency (most common first)
    const languages = [...languageCounts.entries()]
        .sort((a, b) => b[1] - a[1])
        .map(([lang]) => lang);
    // 7. Detect frameworks from file patterns
    for (const file of files) {
        const basename = path.basename(file.relativePath);
        for (const { pattern, framework } of FRAMEWORK_FILE_PATTERNS) {
            if (pattern === basename || basename.startsWith(pattern + '.') || basename.startsWith(pattern)) {
                // Exact match or starts with pattern (e.g., "next.config.mjs" starts with "next.config")
                if (pattern.includes('.') ? basename.startsWith(pattern) : basename === pattern) {
                    detectedFrameworks.add(framework);
                }
            }
        }
    }
    // Check for Flask/FastAPI from app.py or wsgi.py
    const hasAppPy = files.some(f => path.basename(f.relativePath) === 'app.py');
    const hasWsgiPy = files.some(f => path.basename(f.relativePath) === 'wsgi.py');
    if (hasAppPy || hasWsgiPy) {
        // Try to read the file to check imports
        const targetFile = files.find(f => path.basename(f.relativePath) === 'app.py' || path.basename(f.relativePath) === 'wsgi.py');
        if (targetFile) {
            const content = readFileSafe(targetFile.path);
            if (content) {
                if (content.includes('from flask') || content.includes('import flask')) {
                    detectedFrameworks.add('Flask');
                }
                if (content.includes('from fastapi') || content.includes('import fastapi')) {
                    detectedFrameworks.add('FastAPI');
                }
            }
        }
    }
    // Check for Rails from Gemfile
    const gemfileContent = readFileSafe(path.join(projectRoot, 'Gemfile'));
    if (gemfileContent) {
        if (gemfileContent.includes("'rails'") || gemfileContent.includes('"rails"')) {
            detectedFrameworks.add('Ruby on Rails');
        }
    }
    // 8. Get git commit hash
    let gitCommitHash = '';
    try {
        gitCommitHash = execSync('git rev-parse HEAD', {
            cwd: projectRoot,
            encoding: 'utf-8',
            stdio: ['pipe', 'pipe', 'pipe'],
        }).trim();
    }
    catch {
        // Not a git repo or git not available
    }
    return {
        name,
        description,
        languages,
        frameworks: [...detectedFrameworks],
        analyzedAt: new Date().toISOString(),
        gitCommitHash,
    };
}
/**
 * Scans a project directory for source files, excluding common non-source
 * directories and respecting ignore patterns.
 *
 * @param projectRoot - Absolute path to the project root directory
 * @param ignorePatterns - Additional glob patterns to exclude
 * @returns ScanResult with discovered files and detected project metadata
 */
export function scanProject(projectRoot, ignorePatterns = []) {
    // Read .understand-anything/.understandignore patterns
    const understandIgnorePatterns = readUnderstandIgnore(projectRoot);
    // Combine all ignore patterns
    const allIgnorePatterns = [...ignorePatterns, ...understandIgnorePatterns];
    // Scan the directory tree
    const files = [];
    scanDirectory(projectRoot, projectRoot, allIgnorePatterns, files);
    // Detect project metadata from manifest files and scanned files
    const metadata = detectMetadata(projectRoot, files);
    return {
        files,
        metadata,
    };
}