// Auto-build script that watches for file changes and runs build-installer.bat
// Note: Using CommonJS require() - rename to .cjs if package.json has "type": "module"
const { spawn } = require('child_process');
const fs = require('fs');
const path = require('path');

// Directories/files to watch
const watchPaths = [
  'app.js',
  'main.cjs',
  'main.js',
  'preload.cjs',
  'preload.js',
  'server.js',
  'index.html',
  'styles.css',
  'init.js',
  '*.js',
  '*.html',
  '*.css',
  '*.json'
];

// Directories to ignore
const ignorePaths = [
  'node_modules',
  'dist',
  'dist-installer',
  '.git',
  'Notes',
  'Graphics',
  'Announcements'
];

let buildTimeout = null;
let isBuilding = false;
const DEBOUNCE_MS = 3000; // Wait 3 seconds after last change before building

console.log('=== Bible App Auto-Builder ===');
console.log('Watching for file changes...');
console.log('Press Ctrl+C to stop\n');

// Simple file watcher using fs.watch
function watchDirectory(dir) {
  try {
    const watcher = fs.watch(dir, { recursive: true }, (eventType, filename) => {
      if (!filename) return;
      
      const fullPath = path.join(dir, filename);
      
      // Check if path should be ignored
      const shouldIgnore = ignorePaths.some(ignore => 
        fullPath.includes(ignore) || filename.includes(ignore)
      );
      
      if (shouldIgnore) return;
      
      // Only watch for changes to relevant files
      const ext = path.extname(filename).toLowerCase();
      const isRelevantFile = ['.js', '.html', '.css', '.json', '.cjs'].includes(ext) ||
                             ['app.js', 'main.cjs', 'main.js', 'server.js', 'index.html', 'styles.css'].includes(filename);
      
      if (!isRelevantFile && ext !== '') return;
      
      // Ignore temporary files
      if (filename.includes('~') || filename.startsWith('.')) return;
      
      console.log(`\n[${new Date().toLocaleTimeString()}] Change detected: ${filename}`);
      
      // Debounce: clear previous timeout and set new one
      if (buildTimeout) {
        clearTimeout(buildTimeout);
      }
      
      buildTimeout = setTimeout(() => {
        if (!isBuilding) {
          runBuild();
        }
      }, DEBOUNCE_MS);
    });
    
    return watcher;
  } catch (err) {
    // Directory might not exist or not accessible
    return null;
  }
}

function runBuild() {
  if (isBuilding) {
    console.log('Build already in progress, skipping...');
    return;
  }
  
  isBuilding = true;
  console.log('\n=== Starting automatic build ===');
  console.log(`[${new Date().toLocaleTimeString()}] Running build-installer.bat...\n`);
  
  const buildProcess = spawn('build-installer.bat', [], {
    cwd: __dirname,
    shell: true,
    stdio: 'inherit'
  });
  
  buildProcess.on('close', (code) => {
    isBuilding = false;
    if (code === 0) {
      console.log(`\n[${new Date().toLocaleTimeString()}] Build completed successfully!`);
    } else {
      console.log(`\n[${new Date().toLocaleTimeString()}] Build failed with code ${code}`);
    }
    console.log('Watching for more changes...\n');
  });
  
  buildProcess.on('error', (err) => {
    isBuilding = false;
    console.error(`\n[${new Date().toLocaleTimeString()}] Build error:`, err.message);
    console.log('Watching for more changes...\n');
  });
}

// Start watching the current directory
const watcher = watchDirectory(__dirname);

if (!watcher) {
  console.error('Failed to start file watcher');
  process.exit(1);
}

// Handle cleanup
process.on('SIGINT', () => {
  console.log('\n\nStopping file watcher...');
  if (watcher) watcher.close();
  if (buildTimeout) clearTimeout(buildTimeout);
  process.exit(0);
});

console.log('File watcher started. Make changes to your files to trigger automatic builds.');
console.log('(Changes are debounced - build starts 3 seconds after last change)\n');