import jwt from "jsonwebtoken";
import { UserInterface } from "../models/user-model";
import env from "../enviroment/env";
import { Request, Response, NextFunction } from "express";
import { getUserDB } from "../db/dbFactory";

const userDB = getUserDB();

interface RequestType extends Request {
  user?: UserInterface;
  token?: string;
  encryptedToken?: string;
}

type jwtType = {
  iv: Buffer;
  _id: string;
  time: number;
};

const removeOldTokens = async (
  userID: string,
  uuid: string | undefined,
  oldTime: number
) => {
  try {
    const minusTime = oldTime - 1000 * 60 * 60;

    await userDB.removeOldTokens(userID, uuid, minusTime, false);
  } catch (e) {
    console.log("cannot remove old tokens", e);
  }
};

const authRefresh = async (
  req: RequestType,
  res: Response,
  next: NextFunction
) => {
  try {
    const refreshToken = req.cookies["refresh-token"];
    const currentUUID = req.headers.uuid as string;

    if (!refreshToken) throw new Error("No Refresh Token");

    const decoded = jwt.verify(refreshToken, env.passwordRefresh!) as jwtType;

    const time = decoded.time;

    const user = await userDB.getUserInfo(decoded._id);

    if (!user) throw new Error("No User");

    const encrpytionKey = user.getEncryptionKey();
    const encryptedToken = user.encryptToken(
      refreshToken,
      encrpytionKey,
      decoded.iv
    );

    let tokenFound = false;

    for (let i = 0; i < user.tokens.length; i++) {
      const currentEncryptedToken = user.tokens[i].token;

      if (currentEncryptedToken === encryptedToken) {
        tokenFound = true;
        removeOldTokens(user._id.toString(), currentUUID, time);
        break;
      }
    }

    if (!tokenFound) throw new Error("Refresh Token Not Found");

    req.user = user;

    next();
  } catch (e) {
    if (
      e instanceof Error &&
      e.message !== "No Refresh Token" &&
      e.message !== "No User" &&
      e.message !== "Refresh Token Not Found"
    ) {
      console.log("\nAuthorization Refresh Middleware Error:", e.message);
    }

    res.status(401).send("Error Refreshing Token");
  }
};

export default authRefresh;