const pool = require('../config/database');
const crypto = require('crypto');

class OAuthClient {
  // 创建OAuth客户端表
  static async createTable() {
    const query = `
      CREATE TABLE IF NOT EXISTS oauth_clients (
        id SERIAL PRIMARY KEY,
        client_id VARCHAR(100) UNIQUE NOT NULL,
        client_secret VARCHAR(255) NOT NULL,
        name VARCHAR(100) NOT NULL,
        description TEXT,
        redirect_uris TEXT[] NOT NULL,
        scopes TEXT[] DEFAULT ARRAY['read', 'write'],
        user_id INTEGER REFERENCES users(id) ON DELETE CASCADE,
        is_active BOOLEAN DEFAULT true,
        created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
        updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
      );
    `;
    
    try {
      await pool.query(query);
      console.log('OAuth客户端表创建成功');
    } catch (error) {
      console.error('创建OAuth客户端表失败:', error);
      throw error;
    }
  }

  // 创建授权码表
  static async createAuthCodeTable() {
    const query = `
      CREATE TABLE IF NOT EXISTS oauth_auth_codes (
        id SERIAL PRIMARY KEY,
        code VARCHAR(100) UNIQUE NOT NULL,
        client_id VARCHAR(100) NOT NULL,
        user_id INTEGER NOT NULL,
        redirect_uri VARCHAR(255) NOT NULL,
        scopes TEXT[],
        expires_at TIMESTAMP WITH TIME ZONE NOT NULL,
        created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
      );
    `;
    
    try {
      await pool.query(query);
      console.log('OAuth授权码表创建成功');
    } catch (error) {
      console.error('创建OAuth授权码表失败:', error);
      throw error;
    }
  }

  // 创建访问令牌表
  static async createAccessTokenTable() {
    const query = `
      CREATE TABLE IF NOT EXISTS oauth_access_tokens (
        id SERIAL PRIMARY KEY,
        token VARCHAR(255) UNIQUE NOT NULL,
        client_id VARCHAR(100) NOT NULL,
        user_id INTEGER NOT NULL,
        scopes TEXT[],
        expires_at TIMESTAMP WITH TIME ZONE NOT NULL,
        created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
      );
    `;
    
    try {
      await pool.query(query);
      console.log('OAuth访问令牌表创建成功');
    } catch (error) {
      console.error('创建OAuth访问令牌表失败:', error);
      throw error;
    }
  }

  // 创建刷新令牌表
  static async createRefreshTokenTable() {
    const query = `
      CREATE TABLE IF NOT EXISTS oauth_refresh_tokens (
        id SERIAL PRIMARY KEY,
        token VARCHAR(255) UNIQUE NOT NULL,
        access_token_id INTEGER REFERENCES oauth_access_tokens(id) ON DELETE CASCADE,
        client_id VARCHAR(100) NOT NULL,
        user_id INTEGER NOT NULL,
        is_revoked BOOLEAN DEFAULT FALSE,
        expires_at TIMESTAMP WITH TIME ZONE NOT NULL,
        created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
      );
    `;
    
    try {
      await pool.query(query);
      console.log('OAuth刷新令牌表创建成功');
    } catch (error) {
      console.error('创建OAuth刷新令牌表失败:', error);
      throw error;
    }
  }

  // 生成客户端ID和密钥
  static generateClientCredentials() {
    const clientId = crypto.randomBytes(32).toString('hex');
    const clientSecret = crypto.randomBytes(64).toString('hex');
    return { clientId, clientSecret };
  }

  // 创建新的OAuth客户端
  static async create(clientData) {
    const { name, description, redirectUris, scopes, userId } = clientData;
    const { clientId, clientSecret } = this.generateClientCredentials();
    
    const query = `
      INSERT INTO oauth_clients (client_id, client_secret, name, description, redirect_uris, scopes, user_id)
      VALUES ($1, $2, $3, $4, $5, $6, $7)
      RETURNING id, client_id, client_secret, name, description, redirect_uris, scopes, created_at
    `;
    
    try {
      const result = await pool.query(query, [
        clientId, 
        clientSecret, 
        name, 
        description, 
        redirectUris, 
        scopes || ['read', 'write'], 
        userId
      ]);
      return result.rows[0];
    } catch (error) {
      console.error('创建OAuth客户端失败:', error);
      throw error;
    }
  }

  // 重置客户端密钥
  static async resetClientSecret(clientId) {
    const newSecret = crypto.randomBytes(64).toString('hex');
    const query = 'UPDATE oauth_clients SET client_secret = $1 WHERE client_id = $2 AND is_active = true';
    
    try {
      const result = await pool.query(query, [newSecret, clientId]);
      if (result.rowCount === 0) {
        throw new Error('客户端不存在或已禁用');
      }
      return newSecret;
    } catch (error) {
      console.error('重置客户端密钥失败:', error);
      throw error;
    }
  }

  // 根据客户端ID查找客户端
  static async findByClientId(clientId) {
    const query = 'SELECT * FROM oauth_clients WHERE client_id = $1 AND is_active = true';
    try {
      const result = await pool.query(query, [clientId]);
      return result.rows[0];
    } catch (error) {
      console.error('查找OAuth客户端失败:', error);
      throw error;
    }
  }

  // 验证客户端密钥
  static async validateClient(clientId, clientSecret) {
    const client = await this.findByClientId(clientId);
    if (!client) return false;
    return client.client_secret === clientSecret;
  }

  // 验证重定向URI
  static async validateRedirectUri(clientId, redirectUri) {
    const client = await this.findByClientId(clientId);
    if (!client) return false;
    // console.log(client.redirect_uris)
    console.log("请求 redirect_uri: ", redirectUri);
console.log("允许 redirect_uris: ", client.redirect_uris);
console.log("是否包含: ", client.redirect_uris.includes(redirectUri));

    return client.redirect_uris.includes(redirectUri);
  }

  // 获取用户的所有客户端
  static async findByUserId(userId) {
    const query = 'SELECT id, client_id, name, description, redirect_uris, scopes, created_at FROM oauth_clients WHERE user_id = $1 AND is_active = true';
    try {
      const result = await pool.query(query, [userId]);
      return result.rows;
    } catch (error) {
      console.error('查找用户客户端失败:', error);
      throw error;
    }
  }

  // 删除客户端
  static async delete(clientId, userId) {
    const query = 'UPDATE oauth_clients SET is_active = false WHERE client_id = $1 AND user_id = $2';
    try {
      const result = await pool.query(query, [clientId, userId]);
      return result.rowCount > 0;
    } catch (error) {
      console.error('删除OAuth客户端失败:', error);
      throw error;
    }
  }
}

module.exports = OAuthClient;