import dotenv from 'dotenv';
import mysql from 'mysql2/promise';

// 載入環境變數
dotenv.config();

// 資料庫配置
export const dbConfig = {
  host: process.env.DB_HOST || 'localhost',
  port: parseInt(process.env.DB_PORT) || 3306,
  user: process.env.DB_USER || 'root',
  password: process.env.DB_PASSWORD || '',
  database: process.env.DB_NAME || 'db_A102',
  waitForConnections: true,
  connectionLimit: 10,
  queueLimit: 0,
  enableKeepAlive: true,
  keepAliveInitialDelay: 0
};

// 建立連線池
export const pool = mysql.createPool(dbConfig);

// 測試資料庫連線
export async function testConnection() {
  try {
    const connection = await pool.getConnection();
    console.log('✅ Database connected successfully');
    console.log(`   Host: ${dbConfig.host}:${dbConfig.port}`);
    console.log(`   Database: ${dbConfig.database}`);
    connection.release();
    return true;
  } catch (error) {
    console.error('❌ Database connection failed:', error.message);
    return false;
  }
}

// 執行查詢的輔助函數
export async function query(sql, params = []) {
  try {
    const [results] = await pool.execute(sql, params);
    return results;
  } catch (error) {
    console.error('Query error:', error.message);
    throw error;
  }
}

// Ollama API 配置
export const ollamaConfig = {
  apiUrl: process.env.OLLAMA_API_URL || 'https://ollama_pjapi.theaken.com',
  model: process.env.OLLAMA_MODEL || 'qwen2.5:3b',
  maxTokens: 6000,
  temperature: 0.7,
  timeout: 120000
};

// 伺服器配置
export const serverConfig = {
  host: process.env.SERVER_HOST || 'localhost',
  port: parseInt(process.env.SERVER_PORT) || 3001,
  clientPort: parseInt(process.env.CLIENT_PORT) || 5173
};

// Session 配置
export const sessionConfig = {
  secret: process.env.SESSION_SECRET || 'change-this-secret-key',
  resave: false,
  saveUninitialized: false,
  cookie: {
    secure: process.env.NODE_ENV === 'production',
    httpOnly: true,
    maxAge: 24 * 60 * 60 * 1000 // 24 hours
  }
};

// 安全配置
export const securityConfig = {
  bcryptRounds: parseInt(process.env.BCRYPT_ROUNDS) || 10,
  rateLimitMax: parseInt(process.env.RATE_LIMIT_MAX) || 100,
  rateLimitWindowMs: parseInt(process.env.RATE_LIMIT_WINDOW_MS) || 900000 // 15 minutes
};

// Gitea 配置
export const giteaConfig = {
  url: process.env.GITEA_URL || 'https://gitea.theaken.com/',
  user: process.env.GITEA_USER || '',
  token: process.env.GITEA_TOKEN || ''
};

export default {
  dbConfig,
  pool,
  testConnection,
  query,
  ollamaConfig,
  serverConfig,
  sessionConfig,
  securityConfig,
  giteaConfig
};