#!/usr/bin/env node
/**
 * File Permissions Checker - Enforces inst_020_CONSOLIDATED
 * Verifies correct file permissions for web deployment
 */

const fs = require('fs');
const path = require('path');
const { execSync } = require('child_process');

const EXPECTED_PERMISSIONS = {
  html: 0o644,  // rw-r--r--
  css: 0o644,
  js: 0o644,
  json: 0o644,
  md: 0o644,
  txt: 0o644,
  sh: 0o755,    // rwxr-xr-x (executable scripts)
};

function checkPermissions(directory) {
  const issues = [];
  
  function scanDir(dir) {
    const entries = fs.readdirSync(dir, { withFileTypes: true });
    
    entries.forEach(entry => {
      const fullPath = path.join(dir, entry.name);
      const relativePath = path.relative(process.cwd(), fullPath);
      
      if (entry.isDirectory()) {
        if (!entry.name.startsWith('.') && entry.name !== 'node_modules') {
          scanDir(fullPath);
        }
      } else if (entry.isFile()) {
        const ext = path.extname(entry.name).slice(1);
        const stats = fs.statSync(fullPath);
        const perms = stats.mode & 0o777;
        
        const expected = EXPECTED_PERMISSIONS[ext];
        if (expected && perms !== expected) {
          issues.push({
            file: relativePath,
            current: perms.toString(8),
            expected: expected.toString(8),
            ext
          });
        }
      }
    });
  }
  
  scanDir(directory);
  return issues;
}

function main() {
  const targetDir = process.argv[2] || 'public';
  
  console.log(`\n📋 File Permissions Check (inst_020_CONSOLIDATED)\n`);
  console.log(`Scanning: ${targetDir}\n`);
  
  if (!fs.existsSync(targetDir)) {
    console.log(`⚠️  Directory not found: ${targetDir}\n`);
    process.exit(0);
  }
  
  const issues = checkPermissions(targetDir);
  
  if (issues.length === 0) {
    console.log('✅ All file permissions correct\n');
    process.exit(0);
  }
  
  console.log(`❌ Found ${issues.length} permission issue(s):\n`);
  console.log('━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\n');
  
  issues.slice(0, 20).forEach(i => {
    console.log(`  ${i.file}`);
    console.log(`    Current: ${i.current} | Expected: ${i.expected} (${i.ext} files)`);
  });
  
  if (issues.length > 20) {
    console.log(`\n  ... and ${issues.length - 20} more\n`);
  }
  
  console.log('\n━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\n');
  console.log('Fix with:');
  console.log(`  chmod 644 ${targetDir}/**/*.{html,css,js,json,md,txt}`);
  console.log(`  chmod 755 ${targetDir}/**/*.sh\n`);
  
  process.exit(1);
}

main();