/**
 * Build Verification Script
 *
 * Extracts and validates environment variables embedded in the built bundle.
 * Ensures redirect URIs match the expected deployment target.
 *
 * Usage:
 *   BUILD_TARGET=docker-local npm run build:verify
 *   BUILD_TARGET=production npm run build:verify
 */
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

// Expected redirect URIs for each deployment target
const EXPECTED_URIS = {
  'docker-local': 'http://localhost:8099/oauth/callback',
  production: 'https://app.pokedex.online/oauth/callback'
};

// ANSI colors
const colors = {
  red: '\x1b[31m',
  green: '\x1b[32m',
  yellow: '\x1b[33m',
  blue: '\x1b[34m',
  reset: '\x1b[0m'
};

function log(color, symbol, message) {
  console.log(`${colors[color]}${symbol}${colors.reset} ${message}`);
}

function findBuiltAssets() {
  const distPath = path.resolve(__dirname, '../dist/assets');

  if (!fs.existsSync(distPath)) {
    throw new Error('dist/assets directory not found. Run build first.');
  }

  const files = fs.readdirSync(distPath);
  const jsFiles = files.filter(
    f => f.endsWith('.js') && f.startsWith('index-')
  );

  if (jsFiles.length === 0) {
    throw new Error('No built JavaScript files found in dist/assets/');
  }

  return jsFiles.map(f => path.join(distPath, f));
}

function extractRedirectUri(content) {
  // Look for the Discord redirect URI in the built bundle
  const patterns = [
    /VITE_DISCORD_REDIRECT_URI[\"']?\s*[:=]\s*[\"']([^\"']+)[\"']/,
    /discord_redirect_uri[\"']?\s*[:=]\s*[\"']([^\"']+)[\"']/i,
    /redirectUri[\"']?\s*[:=]\s*[\"']([^\"']+oauth\/callback)[\"']/,
    /(https?:\/\/[^\"'\s]+\/oauth\/callback)/
  ];

  for (const pattern of patterns) {
    const match = content.match(pattern);
    if (match && match[1]) {
      return match[1];
    }
  }

  return null;
}

function verifyBuild() {
  console.log('\n🔍 Build Verification\n');

  // Get target from environment variable
  const target = process.env.BUILD_TARGET || 'local';

  if (!EXPECTED_URIS[target]) {
    log('red', '❌', `Invalid BUILD_TARGET: ${target}`);
    log('blue', 'ℹ', 'Valid targets: docker-local, production');
    process.exit(1);
  }

  const expectedUri = EXPECTED_URIS[target];
  log('blue', 'ℹ', `Deployment target: ${target}`);
  log('blue', 'ℹ', `Expected redirect URI: ${expectedUri}`);

  try {
    // Find built assets
    const assetFiles = findBuiltAssets();
    log('green', '✅', `Found ${assetFiles.length} built asset(s)`);

    // Search for redirect URI in all assets
    let foundUri = null;
    for (const assetFile of assetFiles) {
      const content = fs.readFileSync(assetFile, 'utf8');
      const uri = extractRedirectUri(content);

      if (uri) {
        foundUri = uri;
        break;
      }
    }

    if (!foundUri) {
      log('yellow', '⚠', 'Could not find Discord redirect URI in bundle');
      log('blue', 'ℹ', 'This may be OK if OAuth is not used');
      process.exit(0);
    }

    log('blue', 'ℹ', `Found redirect URI: ${foundUri}`);

    // Validate URI matches expected
    if (foundUri === expectedUri) {
      log('green', '✅', 'Redirect URI matches expected value!');
      console.log('\n✅ Build verification passed\n');
      process.exit(0);
    } else {
      log('red', '❌', 'Redirect URI MISMATCH!');
      log('blue', 'ℹ', `Expected: ${expectedUri}`);
      log('blue', 'ℹ', `Found:    ${foundUri}`);
      console.log('\n❌ Build verification failed\n');
      console.log(
        'This usually means the wrong .env.{mode} file was used during build.'
      );
      console.log("Check that you're using the correct Vite mode flag:\n");
      console.log(
        '  vite build --mode docker-local  (for local Docker deployment)'
      );
      console.log(
        '  vite build --mode production    (for Synology deployment)\n'
      );
      process.exit(1);
    }
  } catch (error) {
    log('red', '❌', `Verification error: ${error.message}`);
    process.exit(1);
  }
}

// Run verification
verifyBuild();