import {Request, Response, NextFunction} from "express";
import axios from "axios";

export type UserInfo = {
  userId: number;
  nickname: string;
  avatarUrl: string;
  gender: 'MALE' | 'FEMALE' | 'UNKNOWN';
  nimToken: string; // NetEase Cloud Communication token
  nimAccountId: string; // NetEase Cloud Communication account ID
  createdAt: string;
  updatedAt: string;
}

declare global {
  namespace Express {
    interface Request {
      userInfo?: UserInfo | null;
      groupInfo?: {
        groupId: number;
        users: UserInfo[];
      } | null;
    }
  }
}

/**
 * Extract Bearer token from request header
 */
export const extractTokenFromHeader = (authHeader: string | undefined): string | null => {
  if (!authHeader) {
    return null;
  }

  const parts = authHeader.split(" ");
  if (parts.length !== 2 || parts[0] !== "Bearer") {
    return null;
  }

  return parts[1];
};

/**
 * Get user information by token
 */
export const getUserInfoByToken = async (token: string): Promise<any> => {
  try {
    const response = await axios.post(
      "https://egret.byteawake.com/api/user/info",
      {}, // 请求体数据，这里为空对象
      {
        headers: {
          Authorization: `Bearer ${token}`,
        },
        timeout: 10000, // 10 second timeout
      }
    );

    return response.data;
  } catch (error: any) {
    if (error.response) {
      // API returned error response
      throw new Error(`Failed to get user information: ${error.response.status} ${error.response.statusText}`);
    } else if (error.request) {
      // Request was sent but no response received
      throw new Error("Failed to get user information: timeout or network error");
    } else {
      // Other errors
      throw new Error(`Failed to get user information: ${error.message}`);
    }
  }
};

/**
 * User information middleware
 * Automatically extract token from request header and get user information, store result in req.userInfo
 */
export const userInfoMiddleware = async (
  req: Request,
  res: Response,
  next: NextFunction
): Promise<void> => {
  try {
    const authHeader = req.headers.authorization;
    const token = extractTokenFromHeader(authHeader);

    if (!token) {
      res.status(401).json({
        error: "No valid access token provided",
        message: "Missing Bearer token in Authorization header",
      });
      return;
    }

    // Get user information
    const userInfoRes = await getUserInfoByToken(token);
    req.userInfo = userInfoRes.code === 200 ? userInfoRes.data : null;

    next();
  } catch (error: any) {
    res.status(401).json({
      error: "User authentication failed",
      message: error.message,
    });
  }
};

//////// group

/**
 * Get group users
 */
export const getGroupUsers = async (groupId: number, token: string): Promise<any> => {
  try {
    const response = await axios.post<UserInfo[]>(
      "https://egret.byteawake.com/api/group/members",
      {groupId},
      {
        headers: {
          Authorization: `Bearer ${token}`,
        },
        timeout: 10000, // 10 second timeout
      }
    );

    return response.data;
  } catch (error: any) {
    if (error.response) {
      // API returned error response
      throw new Error(`Failed to get user information: ${error.response.status} ${error.response.statusText}`);
    } else if (error.request) {
      // Request was sent but no response received
      throw new Error("Failed to get user information: timeout or network error");
    } else {
      // Other errors
      throw new Error(`Failed to get user information: ${error.message}`);
    }
  }
};


/**
 * group information middleware
 */
export const groupInfoMiddleware = async (
  req: Request,
  res: Response,
  next: NextFunction
): Promise<void> => {
  try {
    const authHeader = req.headers.authorization;
    const token = extractTokenFromHeader(authHeader);
    const groupId = req.headers.groupid;

    if (token && groupId) {
      try {
        const usersRes = await getGroupUsers(Number(groupId), token);
        const users: UserInfo[] = usersRes.code === 200 ? usersRes.data : [];
        req.groupInfo = {
          groupId: Number(groupId),
          users,
        }
      } catch (error) {
        // If getting user information fails, do not block the request from continuing, but do not set userInfo
        console.warn("Failed to get group user information:", error);
      }
    }

    next();
  } catch (error: any) {
    res.status(400).json({
      error: "Get Group Users failed",
      message: error.message,
    });
  }
};