import 'reflect-metadata';

import { NextFunction, Request, Response } from 'express';

import Scope from '../constants/scope';
import Token from '../model/token';
import Store from '../store/store';

declare module 'express' {
  export interface Request {
     userId?: string;
     scope?: Scope[];
  }
}

export const authorize = (store: Store<Token>): ((req: Request, res: Response, next: NextFunction) => void) => {
  return (req: Request, res: Response, next: NextFunction) => {
    const authHeader = req.headers.authorization;
    if (!authHeader) {
      res.status(401).send({
        error: {
          status: 401,
          message: 'No token provided',
        },
      });
      return;
    }

    const token = store.get(authHeader);
    if (!token) {
      res.status(401).send({
        error: {
          status: 401,
          message: 'Invalid access token',
        },
      });
      return;
    }

    if (token.expiryDate.getTime() < Date.now()) {
      res.status(401).send({
        error: {
          status: 401,
          message: 'The access token expired',
        },
      });
      return;
    }

    req.userId = token.userId;
    req.scope = token.scope;
    next();
  };
};