#!/usr/bin/env node

/**
 * Environment Variable Validation Script
 * Checks your .env file for production deployment without exposing secrets
 */

import dotenv from 'dotenv';
import { fileURLToPath } from 'url';
import { dirname, join } from 'path';
import { existsSync } from 'fs';

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

// Colors for terminal output
const colors = {
  reset: '\x1b[0m',
  red: '\x1b[31m',
  green: '\x1b[32m',
  yellow: '\x1b[33m',
  blue: '\x1b[34m',
  magenta: '\x1b[35m',
  cyan: '\x1b[36m',
};

const log = {
  error: (msg) => console.log(`${colors.red}❌ ${msg}${colors.reset}`),
  success: (msg) => console.log(`${colors.green}✅ ${msg}${colors.reset}`),
  warning: (msg) => console.log(`${colors.yellow}⚠️  ${msg}${colors.reset}`),
  info: (msg) => console.log(`${colors.blue}ℹ️  ${msg}${colors.reset}`),
  header: (msg) => console.log(`\n${colors.cyan}${'='.repeat(60)}${colors.reset}`),
  title: (msg) => console.log(`${colors.magenta}${msg}${colors.reset}`),
};

// Load environment variables
const envPath = join(__dirname, '..', '.env');
const envLocalPath = join(__dirname, '..', '.env.local');

console.clear();
log.header();
log.title('🔍 Environment Configuration Validator');
log.header();

// Check if .env files exist
console.log('\n📁 Checking .env files...\n');

if (!existsSync(envPath)) {
  log.error('.env file not found!');
  process.exit(1);
}
log.success('.env file exists');

if (existsSync(envLocalPath)) {
  log.info('.env.local file exists (will override .env values)');
  dotenv.config({ path: envLocalPath });
}

dotenv.config({ path: envPath });

// Validation rules
const issues = [];
const warnings = [];
let passedChecks = 0;
const totalChecks = 15;

console.log('\n🔍 Validating configuration...\n');

// Helper functions
const checkRequired = (key, name) => {
  if (!process.env[key]) {
    issues.push(`Missing required variable: ${key} (${name})`);
    return false;
  }
  passedChecks++;
  return true;
};

const checkUrl = (key, expectedProtocol, expectedDomain) => {
  const value = process.env[key];
  if (!value) {
    issues.push(`Missing ${key}`);
    return false;
  }

  if (value.includes('localhost') || value.includes('127.0.0.1')) {
    issues.push(`${key} contains localhost/127.0.0.1 - should be production domain`);
    log.error(`${key}: Uses localhost (should be ${expectedDomain})`);
    return false;
  }

  if (!value.startsWith(expectedProtocol)) {
    warnings.push(`${key} should start with ${expectedProtocol}`);
    log.warning(`${key}: Should start with ${expectedProtocol}`);
  }

  if (expectedDomain && !value.includes(expectedDomain)) {
    issues.push(`${key} should contain ${expectedDomain}`);
    log.error(`${key}: Should contain ${expectedDomain}`);
    return false;
  }

  log.success(`${key}: Correctly configured`);
  passedChecks++;
  return true;
};

const checkValue = (key, expectedValue, description) => {
  const value = process.env[key];
  if (!value) {
    warnings.push(`${key} not set (${description})`);
    return false;
  }

  if (value !== expectedValue) {
    issues.push(`${key} should be "${expectedValue}" but is "${value}"`);
    log.error(`${key}: Should be "${expectedValue}"`);
    return false;
  }

  log.success(`${key}: Correctly set to "${expectedValue}"`);
  passedChecks++;
  return true;
};

const checkBoolean = (key, expectedValue) => {
  const value = process.env[key];
  if (!value) {
    warnings.push(`${key} not set`);
    return false;
  }

  if (value !== expectedValue) {
    issues.push(`${key} should be "${expectedValue}" but is "${value}"`);
    log.error(`${key}: Should be "${expectedValue}" for production`);
    return false;
  }

  log.success(`${key}: Correctly set to "${expectedValue}"`);
  passedChecks++;
  return true;
};

const maskSecret = (value) => {
  if (!value || value.length < 8) return '***';
  return value.substring(0, 4) + '...' + value.substring(value.length - 4);
};

// Run validations
console.log('🌐 Network Configuration:');
checkUrl('STEAM_REALM', 'https://', 'api.turbotrades.dev');
checkUrl('STEAM_RETURN_URL', 'https://', 'api.turbotrades.dev');
checkUrl('CORS_ORIGIN', 'https://', 'turbotrades.dev');

// Check CORS_ORIGIN is NOT the API domain
if (process.env.CORS_ORIGIN && process.env.CORS_ORIGIN.includes('api.turbotrades.dev')) {
  issues.push('CORS_ORIGIN should be the FRONTEND domain (turbotrades.dev), not the API domain');
  log.error('CORS_ORIGIN: Should be https://turbotrades.dev (frontend domain)');
  log.info('  CORS_ORIGIN = where requests COME FROM (frontend)');
  log.info('  STEAM_REALM = where requests GO TO (backend)');
} else if (process.env.CORS_ORIGIN && !process.env.CORS_ORIGIN.includes('localhost')) {
  passedChecks++;
}

console.log('\n🔒 Security Configuration:');
checkBoolean('COOKIE_SECURE', 'true');
checkValue('COOKIE_SAME_SITE', 'none', 'for cross-domain cookies');
checkValue('NODE_ENV', 'production', 'production environment');

// Check cookie domain
if (process.env.COOKIE_DOMAIN) {
  if (process.env.COOKIE_DOMAIN.includes('localhost')) {
    issues.push('COOKIE_DOMAIN contains localhost - should be .turbotrades.dev');
    log.error('COOKIE_DOMAIN: Contains localhost');
  } else if (process.env.COOKIE_DOMAIN === '.turbotrades.dev' || process.env.COOKIE_DOMAIN === 'turbotrades.dev') {
    log.success('COOKIE_DOMAIN: Correctly set');
    passedChecks++;
  } else {
    warnings.push('COOKIE_DOMAIN might be incorrect');
    log.warning(`COOKIE_DOMAIN: Set to "${process.env.COOKIE_DOMAIN}" (should be .turbotrades.dev)`);
  }
}

console.log('\n🔑 Required Secrets:');

// Check Steam API Key
if (checkRequired('STEAM_API_KEY', 'Steam API Key')) {
  const key = process.env.STEAM_API_KEY;
  if (key.length === 32 && /^[A-F0-9]{32}$/i.test(key)) {
    log.success(`STEAM_API_KEY: Valid format (${maskSecret(key)})`);
  } else {
    warnings.push('STEAM_API_KEY format looks unusual (should be 32 hex characters)');
    log.warning(`STEAM_API_KEY: Unusual format (${maskSecret(key)})`);
  }
}

// Check MongoDB URI
if (checkRequired('MONGODB_URI', 'MongoDB connection string')) {
  const uri = process.env.MONGODB_URI;
  if (uri.includes('localhost') || uri.includes('127.0.0.1')) {
    issues.push('MONGODB_URI contains localhost - should be production database');
    log.error('MONGODB_URI: Uses localhost (should be production database)');
  } else {
    log.success('MONGODB_URI: Points to remote database');
  }
}

// Check JWT secrets
console.log('\n🎫 JWT Configuration:');
['JWT_ACCESS_SECRET', 'JWT_REFRESH_SECRET', 'SESSION_SECRET'].forEach((key) => {
  if (process.env[key]) {
    const value = process.env[key];
    if (value.includes('your-') || value.includes('change-this') || value.length < 16) {
      warnings.push(`${key} appears to be a default/weak value - generate a secure one!`);
      log.warning(`${key}: Using default/weak value (${maskSecret(value)})`);
    } else {
      log.success(`${key}: Set (${maskSecret(value)})`);
      passedChecks++;
    }
  } else {
    warnings.push(`${key} not set - will use default`);
    log.warning(`${key}: Not set (will use default)`);
  }
});

// Summary
log.header();
console.log('\n📊 Validation Summary:\n');

const score = Math.round((passedChecks / totalChecks) * 100);

if (issues.length === 0 && warnings.length === 0) {
  log.success(`Perfect! All checks passed (${passedChecks}/${totalChecks})`);
  log.success('Your .env file is correctly configured for production! 🎉');
  process.exit(0);
}

console.log(`Checks passed: ${passedChecks}/${totalChecks} (${score}%)\n`);

if (issues.length > 0) {
  log.error(`Found ${issues.length} critical issue(s):\n`);
  issues.forEach((issue, i) => {
    console.log(`  ${i + 1}. ${issue}`);
  });
  console.log();
}

if (warnings.length > 0) {
  log.warning(`Found ${warnings.length} warning(s):\n`);
  warnings.forEach((warning, i) => {
    console.log(`  ${i + 1}. ${warning}`);
  });
  console.log();
}

// Recommendations
if (issues.length > 0) {
  log.header();
  log.title('🔧 Recommended Fixes:');
  log.header();
  console.log('\n1. Edit your .env file:');
  console.log('   nano .env  # or vim .env\n');
  console.log('2. Update the following values:\n');

  if (issues.some(i => i.includes('CORS_ORIGIN'))) {
    console.log('   CORS_ORIGIN=https://turbotrades.dev');
  }
  if (issues.some(i => i.includes('STEAM_REALM'))) {
    console.log('   STEAM_REALM=https://api.turbotrades.dev');
  }
  if (issues.some(i => i.includes('STEAM_RETURN_URL'))) {
    console.log('   STEAM_RETURN_URL=https://api.turbotrades.dev/auth/steam/return');
  }
  if (issues.some(i => i.includes('COOKIE_DOMAIN'))) {
    console.log('   COOKIE_DOMAIN=.turbotrades.dev');
  }
  if (issues.some(i => i.includes('COOKIE_SECURE'))) {
    console.log('   COOKIE_SECURE=true');
  }
  if (issues.some(i => i.includes('MONGODB_URI'))) {
    console.log('   MONGODB_URI=mongodb+srv://...(your production database)');
  }

  console.log('\n3. Restart PM2:');
  console.log('   pm2 restart turbotrades-backend --update-env\n');

  log.header();
  process.exit(1);
}

if (warnings.length > 0) {
  log.info('Configuration is functional but has some warnings.');
  log.info('Consider addressing the warnings above for better security.');
  process.exit(0);
}