import { Request, Response } from "express";
import jwt from "jsonwebtoken";
import BadRequestException from "../exceptions/badRequestException";
import UnauthorizedRequestException from "../exceptions/unauthorizedRequestException";
import InternalException from "../exceptions/internalException";
import { JWTHelper } from "../helpers/jwtHelper";

export default async function authenticate(req: Request, res: Response, next: Function) {
  const bearer = req.headers.authorization?.split(" ")?.[1] ?? undefined;

  if (!bearer) {
    throw new BadRequestException("Provide valid Authorization Header");
  }

  let decoded: string | jwt.JwtPayload;
  await JWTHelper.validate(bearer)
    .then((result) => {
      decoded = result;
    })
    .catch((err) => {
      if (err == "jwt expired") {
        throw new UnauthorizedRequestException("Token expired");
      } else {
        throw new BadRequestException("Failed Authorization Header decoding");
      }
    });

  if (typeof decoded == "string" || !decoded) {
    throw new InternalException("process failed");
  }

  req.userId = decoded.userId;
  req.username = decoded.username;
  req.rights = decoded.rights;

  next();
}