const fs = require('fs');
const path = require('path');
const vm = require('vm');
const ejs = require('ejs');

const JS_DIRS = ['server', 'public/js', 'sample-content/plugins', 'test'];
const VIEW_DIR = 'views';
const CSS_DIR = 'public/css';

let jsFilesChecked = 0;
let ejsFilesChecked = 0;
let cssFilesChecked = 0;
let errorCount = 0;

// 1. JavaScript Checker
function checkJsFile(filePath) {
  jsFilesChecked++;
  const code = fs.readFileSync(filePath, 'utf8');

  try {
    new vm.Script(code, { filename: filePath });
  } catch (err) {
    console.error(`❌ Syntax Error in ${filePath}:\n   ${err.message}`);
    errorCount++;
    return;
  }

  if (/\bdebugger\b/.test(code)) {
    console.error(`⚠️ Warning in ${filePath}: Found 'debugger' statement.`);
    errorCount++;
  }

  if (/-----BEGIN (RSA|EC|OPENSSH|PRIVATE) KEY-----/.test(code)) {
    console.error(`🚨 Security Alert in ${filePath}: Found private key pattern!`);
    errorCount++;
  }
}

// 2. EJS Template Checker
function checkEjsFile(filePath) {
  ejsFilesChecked++;
  const content = fs.readFileSync(filePath, 'utf8');

  // Verify EJS syntax compilation
  try {
    ejs.compile(content, { filename: filePath, client: false });
  } catch (err) {
    console.error(`❌ EJS Compilation Error in ${filePath}:\n   ${err.message}`);
    errorCount++;
    return;
  }

  // Prevent inline style anti-patterns that break IDE CSS linters: style="... <%= ... %> ..."
  const styleMatch = content.match(/style="[^"]*<[%#=][\s\S]*?"/g);
  if (styleMatch) {
    console.error(`❌ Linter Error in ${filePath}: Dynamic EJS expression inside style="" attribute causes IDE CSS linter errors. Use CSS utility classes instead:\n   Matched: ${styleMatch[0]}`);
    errorCount++;
  }
}

// 3. CSS Checker (Brace matching)
function checkCssFile(filePath) {
  cssFilesChecked++;
  const content = fs.readFileSync(filePath, 'utf8');
  let openBraces = 0;
  for (let i = 0; i < content.length; i++) {
    if (content[i] === '{') openBraces++;
    if (content[i] === '}') openBraces--;
    if (openBraces < 0) {
      console.error(`❌ CSS Error in ${filePath}: Unexpected closing brace '}' at char ${i}`);
      errorCount++;
      return;
    }
  }
  if (openBraces !== 0) {
    console.error(`❌ CSS Error in ${filePath}: Unclosed brace '{' (mismatched by ${openBraces})`);
    errorCount++;
  }
}

function walkDir(dir, ext, handler) {
  if (!fs.existsSync(dir)) return;
  const entries = fs.readdirSync(dir, { withFileTypes: true });
  for (const entry of entries) {
    const fullPath = path.join(dir, entry.name);
    if (entry.isDirectory()) {
      if (entry.name !== 'node_modules' && entry.name !== '.git') {
        walkDir(fullPath, ext, handler);
      }
    } else if (entry.isFile() && entry.name.endsWith(ext)) {
      handler(fullPath);
    }
  }
}

console.log('🔍 Running comprehensive project linter (JS, EJS templates, CSS)...');
JS_DIRS.forEach(d => walkDir(d, '.js', checkJsFile));
walkDir(VIEW_DIR, '.ejs', checkEjsFile);
walkDir(CSS_DIR, '.css', checkCssFile);

if (errorCount === 0) {
  console.log(`✓ All files passed verification!`);
  console.log(`  - ${jsFilesChecked} JavaScript files`);
  console.log(`  - ${ejsFilesChecked} EJS templates`);
  console.log(`  - ${cssFilesChecked} CSS stylesheets`);
  process.exit(0);
} else {
  console.error(`\n❌ Linting failed with ${errorCount} error(s).`);
  process.exit(1);
}