import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';
import mysql from 'mysql2/promise';
import dotenv from 'dotenv';
import bcrypt from 'bcryptjs';

dotenv.config();

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

const dbConfig = {
  host: process.env.DB_HOST,
  port: parseInt(process.env.DB_PORT),
  user: process.env.DB_USER,
  password: process.env.DB_PASSWORD,
  database: process.env.DB_NAME,
  multipleStatements: true
};

async function initDatabase() {
  let connection;

  try {
    console.log('\n╔════════════════════════════════════════════╗');
    console.log('║  5 Why Analyzer - Database Initialization ║');
    console.log('╚════════════════════════════════════════════╝\n');

    console.log('🔄 Connecting...');
    connection = await mysql.createConnection(dbConfig);
    console.log('✅ Connected\n');

    // 生成密碼 hash
    const adminPassword = process.env.ADMIN_PASSWORD || 'Admin@123456';
    const adminHash = await bcrypt.hash(adminPassword, 10);

    // 讀取並執行 SQL
    const sqlPath = path.join(__dirname, '../docs/db_schema.sql');
    let sqlContent = fs.readFileSync(sqlPath, 'utf8');
    sqlContent = sqlContent.replace(/\$2a\$10\$YourBcryptHashHere/g, adminHash);

    console.log('📝 Executing SQL statements...\n');
    await connection.query(sqlContent);

    console.log('\n✅ Database initialized successfully!\n');

    // 列出資料表
    const [tables] = await connection.execute(
      "SELECT table_name FROM information_schema.tables WHERE table_schema = ? AND table_name LIKE '%' ORDER BY table_name",
      [dbConfig.database]
    );

    const fiveWhyTables = tables.filter(t => !t.table_name.startsWith('hr_') && !t.table_name.startsWith('pm_'));

    if (fiveWhyTables.length > 0) {
      console.log('📊 5 Why Analyzer Tables:');
      fiveWhyTables.forEach((table, index) => {
        console.log(`   ${index + 1}. ${table.table_name}`);
      });
    }

    console.log(`\n🔐 Admin credentials:`);
    console.log(`   Email: ${process.env.ADMIN_EMAIL || 'admin@example.com'}`);
    console.log(`   Password: ${adminPassword}\n`);

  } catch (error) {
    console.error('\n❌ Error:', error.message);
    process.exit(1);
  } finally {
    if (connection) await connection.end();
  }
}

initDatabase();