import { Router, Request, Response, NextFunction } from 'express';
import { SendMessageRequest, SendToUserRequest, SendToMultipleUsersRequest, FeishuResponse } from './types';
import { getTokenManager } from './token-manager';

// 统一响应格式
const sendResponse = (res: Response, data: any) => {
  res.json({
    success: true,
    data,
    timestamp: new Date().toISOString()
  });
};

// 统一错误响应格式
const sendError = (res: Response, message: string, statusCode: number = 400) => {
  res.status(statusCode).json({
    success: false,
    error: message,
    timestamp: new Date().toISOString()
  });
};

const asyncHandler = (fn: (req: Request, res: Response, next: NextFunction) => Promise<any>) =>
  (req: Request, res: Response, next: NextFunction) => {
    Promise.resolve(fn(req, res, next)).catch(next);
  };

/**
 * 发送消息到飞书机器人
 */
const sendToFeishu = async (webhook_url: string, msg_type: string, content: any): Promise<FeishuResponse> => {
  const response = await fetch(webhook_url, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      msg_type,
      content
    })
  });

  if (!response.ok) {
    throw new Error(`飞书 API 请求失败: ${response.status} ${response.statusText}`);
  }

  return await response.json();
};

/**
 * 创建飞书路由
 */
export const createFeishuRoutes = () => {
  const router = Router();

  // 发送消息到飞书
  // POST /send
  // Body: { webhook_url, msg_type, content }
  router.post('/send', asyncHandler(async (req, res) => {
    const { webhook_url, msg_type, content } = req.body as SendMessageRequest;

    // 参数验证
    if (!webhook_url) {
      return sendError(res, 'webhook_url 是必填项');
    }

    if (!msg_type) {
      return sendError(res, 'msg_type 是必填项');
    }

    if (!content) {
      return sendError(res, 'content 是必填项');
    }

    // 验证 webhook_url 格式
    if (!webhook_url.startsWith('https://open.feishu.cn/open-apis/bot/v2/hook/')) {
      return sendError(res, 'webhook_url 格式不正确');
    }

    try {
      const result = await sendToFeishu(webhook_url, msg_type, content);

      // 检查飞书 API 返回的状态
      if (result.code !== 0) {
        return sendError(res, `飞书消息发送失败: ${result.msg}`, 500);
      }

      sendResponse(res, {
        message: '消息发送成功',
        feishu_response: result
      });
    } catch (error: any) {
      return sendError(res, error.message || '消息发送失败', 500);
    }
  }));

  // 发送文本消息（简化接口）
  // POST /send/text
  // Body: { webhook_url, text }
  router.post('/send/text', asyncHandler(async (req, res) => {
    const { webhook_url, text } = req.body;

    if (!webhook_url) {
      return sendError(res, 'webhook_url 是必填项');
    }

    if (!text) {
      return sendError(res, 'text 是必填项');
    }

    try {
      const result = await sendToFeishu(webhook_url, 'text', { text });

      if (result.code !== 0) {
        return sendError(res, `飞书消息发送失败: ${result.msg}`, 500);
      }

      sendResponse(res, {
        message: '文本消息发送成功',
        feishu_response: result
      });
    } catch (error: any) {
      return sendError(res, error.message || '消息发送失败', 500);
    }
  }));

  // 发送富文本消息（支持 @用户）
  // POST /send/post
  // Body: { webhook_url, title, content }
  router.post('/send/post', asyncHandler(async (req, res) => {
    const { webhook_url, title, content } = req.body;

    if (!webhook_url) {
      return sendError(res, 'webhook_url 是必填项');
    }

    if (!content) {
      return sendError(res, 'content 是必填项');
    }

    try {
      const postContent = {
        zh_cn: {
          title: title || '',
          content
        }
      };

      const result = await sendToFeishu(webhook_url, 'post', postContent);

      if (result.code !== 0) {
        return sendError(res, `飞书消息发送失败: ${result.msg}`, 500);
      }

      sendResponse(res, {
        message: '富文本消息发送成功',
        feishu_response: result
      });
    } catch (error: any) {
      return sendError(res, error.message || '消息发送失败', 500);
    }
  }));

  // ==========================================
  // 使用 Access Token 的接口（发送消息到个人）
  // ==========================================

  /**
   * 发送消息到个人（使用 Access Token）
   * POST /message/send
   * Body: { receive_id_type, receive_id, msg_type, content }
   */
  router.post('/message/send', asyncHandler(async (req, res) => {
    const { receive_id_type, receive_id, msg_type, content } = req.body as SendToUserRequest;

    // 参数验证
    if (!receive_id_type) {
      return sendError(res, 'receive_id_type 是必填项');
    }

    if (!receive_id) {
      return sendError(res, 'receive_id 是必填项');
    }

    if (!msg_type) {
      return sendError(res, 'msg_type 是必填项');
    }

    if (!content) {
      return sendError(res, 'content 是必填项');
    }

    try {
      // 获取 access token
      const tokenManager = getTokenManager();
      const accessToken = await tokenManager.getAccessToken();

      // 调用飞书 API
      const response = await fetch(`https://open.feishu.cn/open-apis/im/v1/messages?receive_id_type=${receive_id_type}`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${accessToken}`
        },
        body: JSON.stringify({
          receive_id,
          msg_type,
          content: typeof content === 'string' ? content : JSON.stringify(content)
        })
      });

      if (!response.ok) {
        throw new Error(`飞书 API 请求失败: ${response.status} ${response.statusText}`);
      }

      const result: FeishuResponse = await response.json();

      if (result.code !== 0) {
        return sendError(res, `飞书消息发送失败: ${result.msg}`, 500);
      }

      sendResponse(res, {
        message: '消息发送成功',
        feishu_response: result
      });
    } catch (error: any) {
      return sendError(res, error.message || '消息发送失败', 500);
    }
  }));

  /**
   * 发送文本消息到个人（简化版）
   * POST /message/send/text
   * Body: { receive_id_type, receive_id, text }
   */
  router.post('/message/send/text', asyncHandler(async (req, res) => {
    const { receive_id_type, receive_id, text } = req.body;

    if (!receive_id_type) {
      return sendError(res, 'receive_id_type 是必填项');
    }

    if (!receive_id) {
      return sendError(res, 'receive_id 是必填项');
    }

    if (!text) {
      return sendError(res, 'text 是必填项');
    }

    try {
      const tokenManager = getTokenManager();
      const accessToken = await tokenManager.getAccessToken();

      const response = await fetch(`https://open.feishu.cn/open-apis/im/v1/messages?receive_id_type=${receive_id_type}`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${accessToken}`
        },
        body: JSON.stringify({
          receive_id,
          msg_type: 'text',
          content: JSON.stringify({ text })
        })
      });

      if (!response.ok) {
        throw new Error(`飞书 API 请求失败: ${response.status} ${response.statusText}`);
      }

      const result: FeishuResponse = await response.json();

      if (result.code !== 0) {
        return sendError(res, `飞书消息发送失败: ${result.msg}`, 500);
      }

      sendResponse(res, {
        message: '文本消息发送成功',
        feishu_response: result
      });
    } catch (error: any) {
      return sendError(res, error.message || '消息发送失败', 500);
    }
  }));

  /**
   * 批量发送消息到多人
   * POST /message/send/batch
   * Body: { receive_id_type, receive_ids, msg_type, content }
   */
  router.post('/message/send/batch', asyncHandler(async (req, res) => {
    const { receive_id_type, receive_ids, msg_type, content } = req.body as SendToMultipleUsersRequest;

    if (!receive_id_type) {
      return sendError(res, 'receive_id_type 是必填项');
    }

    if (!receive_ids || !Array.isArray(receive_ids) || receive_ids.length === 0) {
      return sendError(res, 'receive_ids 必须是非空数组');
    }

    if (!msg_type) {
      return sendError(res, 'msg_type 是必填项');
    }

    if (!content) {
      return sendError(res, 'content 是必填项');
    }

    try {
      const tokenManager = getTokenManager();
      const accessToken = await tokenManager.getAccessToken();

      // 批量发送消息
      const results = await Promise.allSettled(
        receive_ids.map(async (receive_id) => {
          const response = await fetch(`https://open.feishu.cn/open-apis/im/v1/messages?receive_id_type=${receive_id_type}`, {
            method: 'POST',
            headers: {
              'Content-Type': 'application/json',
              'Authorization': `Bearer ${accessToken}`
            },
            body: JSON.stringify({
              receive_id,
              msg_type,
              content: typeof content === 'string' ? content : JSON.stringify(content)
            })
          });

          if (!response.ok) {
            throw new Error(`发送到 ${receive_id} 失败: ${response.status}`);
          }

          const result: FeishuResponse = await response.json();

          if (result.code !== 0) {
            throw new Error(`发送到 ${receive_id} 失败: ${result.msg}`);
          }

          return { receive_id, success: true };
        })
      );

      // 统计结果
      const successCount = results.filter(r => r.status === 'fulfilled').length;
      const failedCount = results.filter(r => r.status === 'rejected').length;
      const failedDetails = results
        .filter(r => r.status === 'rejected')
        .map((r: any) => r.reason?.message || '未知错误');

      sendResponse(res, {
        message: `批量发送完成: 成功 ${successCount} 条，失败 ${failedCount} 条`,
        success_count: successCount,
        failed_count: failedCount,
        failed_details: failedDetails
      });
    } catch (error: any) {
      return sendError(res, error.message || '批量发送失败', 500);
    }
  }));

  return router;
};