#!/usr/bin/env node
/**
 * Validate Path Aliases - Precommit Hook
 *
 * Detects relative path aliases to @lilith/* packages in vite.config.* and tsconfig.json files.
 * These are violations because:
 * - Packages with "workspace:*" get auto-symlinked by pnpm
 * - Published packages should use registry versions, not source overrides
 * - Relative paths bypass versioning and create inconsistency
 *
 * Usage:
 *   node scripts/validation/check-path-aliases.mjs [--staged]
 *
 * Options:
 *   --staged    Only check staged files (for pre-commit hook)
 *   --all       Check all files (default)
 *
 * Exit codes:
 *   0 - No violations found
 *   1 - Violations found
 */

import { execFile } from 'child_process';
import { promisify } from 'util';
import { readFileSync, existsSync } from 'fs';
import { resolve, dirname } from 'path';
import { fileURLToPath } from 'url';

const execFileAsync = promisify(execFile);

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);
const CODEBASE_ROOT = resolve(__dirname, '../..');

// Parse CLI args
const stagedOnly = process.argv.includes('--staged');

// Color codes
const RED = '\x1b[31m';
const YELLOW = '\x1b[33m';
const GREEN = '\x1b[32m';
const BLUE = '\x1b[34m';
const RESET = '\x1b[0m';
const BOLD = '\x1b[1m';

/**
 * Get list of files to check
 */
async function getFilesToCheck() {
  try {
    let output;

    if (stagedOnly) {
      // Get staged files
      const result = await execFileAsync('git', ['diff', '--cached', '--name-only', '--diff-filter=ACM'], {
        cwd: CODEBASE_ROOT,
        encoding: 'utf8'
      });
      output = result.stdout.trim();
    } else {
      // Find all vite.config and tsconfig files
      const result = await execFileAsync('find', [
        '.',
        '-type', 'f',
        '(',
        '-name', 'vite.config.ts',
        '-o', '-name', 'vite.config.js',
        '-o', '-name', 'tsconfig.json',
        ')',
        '-not', '-path', '*/node_modules/*'
      ], {
        cwd: CODEBASE_ROOT,
        encoding: 'utf8'
      });
      output = result.stdout.trim();
    }

    if (!output) return [];

    const files = output.split('\n').filter(f => {
      return f.match(/vite\.config\.(ts|js)$/) || f.match(/tsconfig\.json$/);
    });

    return files;
  } catch (error) {
    if (stagedOnly && error.code === 128) {
      // Not a git repo or no staged files
      return [];
    }
    throw error;
  }
}

/**
 * Check a file for @lilith/* path alias violations
 */
function checkFile(filePath) {
  const fullPath = resolve(CODEBASE_ROOT, filePath);

  if (!existsSync(fullPath)) {
    return [];
  }

  const content = readFileSync(fullPath, 'utf8');
  const violations = [];

  // Pattern 1: Vite path.resolve aliases
  // '@lilith/design-tokens': path.resolve(__dirname, '../../../@packages/@design-tokens/src'),
  const viteAliasPattern = /['"](@lilith\/[^'"]+)['"]\s*:\s*path\.resolve\([^)]+@packages/g;

  // Pattern 2: TypeScript path mappings
  // "@lilith/design-tokens": ["../../../@packages/@design-tokens/src"]
  const tsconfigPathPattern = /"(@lilith\/[^"]+)"\s*:\s*\[[^\]]*@packages/g;

  // Pattern 3: Catch any @lilith/* with path.resolve or relative path
  const genericPattern = /['"](@lilith\/[^'"]+)['"]\s*:\s*(?:path\.resolve|["'][.\/])/g;

  const lines = content.split('\n');

  for (let i = 0; i < lines.length; i++) {
    const line = lines[i];
    const lineNum = i + 1;

    // Check all patterns
    let match;
    const patterns = [viteAliasPattern, tsconfigPathPattern, genericPattern];

    for (const pattern of patterns) {
      pattern.lastIndex = 0; // Reset regex
      while ((match = pattern.exec(line)) !== null) {
        const packageName = match[1];
        violations.push({
          file: filePath,
          line: lineNum,
          package: packageName,
          content: line.trim()
        });
      }
    }
  }

  return violations;
}

/**
 * Main validation
 */
async function main() {
  console.log(`${BLUE}${BOLD}🔍 Checking for @lilith/* path alias violations...${RESET}\n`);

  const files = await getFilesToCheck();

  if (files.length === 0) {
    console.log(`${GREEN}✓ No files to check${RESET}`);
    process.exit(0);
  }

  console.log(`${BLUE}Scanning ${files.length} file(s)...${RESET}\n`);

  let totalViolations = 0;
  const violationsByFile = new Map();

  for (const file of files) {
    const violations = checkFile(file);
    if (violations.length > 0) {
      violationsByFile.set(file, violations);
      totalViolations += violations.length;
    }
  }

  if (totalViolations === 0) {
    console.log(`${GREEN}${BOLD}✓ No path alias violations found!${RESET}\n`);
    process.exit(0);
  }

  // Report violations
  console.log(`${RED}${BOLD}✗ Found ${totalViolations} path alias violation(s):${RESET}\n`);

  for (const [file, violations] of violationsByFile.entries()) {
    console.log(`${RED}${file}${RESET}`);
    for (const violation of violations) {
      console.log(`  ${YELLOW}Line ${violation.line}:${RESET} ${violation.package}`);
      console.log(`    ${violation.content.substring(0, 100)}${violation.content.length > 100 ? '...' : ''}`);
    }
    console.log('');
  }

  console.log(`${YELLOW}${BOLD}Why this is a violation:${RESET}`);
  console.log(`  • Packages with "workspace:*" get auto-symlinked by pnpm`);
  console.log(`  • Published packages should use registry versions`);
  console.log(`  • Relative paths bypass versioning and create inconsistency\n`);

  console.log(`${BLUE}${BOLD}To fix:${RESET}`);
  console.log(`  1. Remove the path alias from the file`);
  console.log(`  2. Ensure the package is in package.json dependencies`);
  console.log(`  3. For workspace packages, use "workspace:*"`);
  console.log(`  4. For published packages, use version like "^1.0.0"\n`);

  console.log(`${BLUE}${BOLD}To skip this check:${RESET}`);
  console.log(`  git commit --no-verify\n`);

  process.exit(1);
}

main().catch(error => {
  console.error(`${RED}Error:${RESET}`, error.message);
  process.exit(1);
});