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;
}

// Extend Express Request type to add user information
declare global {
  namespace Express {
    interface Request {
      userInfo?: UserInfo;
    }
  }
}

/**
 * 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 userInfo = await getUserInfoByToken(token);
    req.userInfo = userInfo;

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

/**
 * Optional user information middleware
 * If there is a token, get user information; if there is no token, the request will not be blocked
 */
export const optionalUserInfoMiddleware = async (
  req: Request,
  res: Response,
  next: NextFunction
): Promise<void> => {
  try {
    const authHeader = req.headers.authorization;
    const token = extractTokenFromHeader(authHeader);

    if (token) {
      try {
        const userInfo = await getUserInfoByToken(token);
        req.userInfo = userInfo;
      } catch (error) {
        // If getting user information fails, do not block the request from continuing, but do not set userInfo
        console.warn("Failed to get user information:", error);
      }
    }

    next();
  } catch (error) {
    // If the middleware itself encounters an error, do not block the request from continuing
    console.error("User information middleware error:", error);
    next();
  }
};