/**
 * Required External Modules and Interfaces
 */
import express, {Request, Response} from 'express';
import * as UserService from '../user/user.service';
import logger from '../../../middleware/logger';
import {Guid} from 'guid-typescript';

/**
 * Router Definition
 */
export const loginRouter = express.Router();

loginRouter.post('/:isDevCall', async (req: Request, res: Response) => {
    try {
        let username: string = '';
        let email: string = '';
        let password: string = '';
        let useDev: boolean = (req.params.isDevCall ?? '') === 'dev'; // TBD

        // Send error when content-type header is missing
        if (!req.headers['content-type']) {
            res.status(400).send({
                'status': 'MISSING_CONTENT_TYPE',
                'message': 'Please set the content-type header field'
            });
            return;
        }

        // API accepts both JSON in body and HTTP parameters
        if (req.headers['content-type'] === 'application/json') {
            username = req.body.username;
            email = req.body.email;
            password = req.body.password;
        } else if (req.headers['content-type'] === 'application/x-www-form-urlencoded') {
            username = (req.query.username ?? '').toString();
            email = (req.query.email ?? '').toString();
            password = (req.query.password ?? '').toString();
        } else {
            res.status(400).send({
                'status': 'WRONG_CONTENT_TYPE',
                'message': 'The transmitted content-type is not supported'
            });
            return;
        }
        let userIP = req.socket.remoteAddress ?? '';
        let deviceInfo = req.headers['user-agent'] ?? '';

        if ((username === '' && email === '') || password === '') {
            res.status(400).send({
                'status': 'WRONG_PARAMS',
                'message': 'Missing or wrong parameters'
            });
            return;
        }

        // Check password and create session
        let session = await UserService.loginUser(useDev, username, email, password, userIP, deviceInfo);

        res.status(200).send(session);
    } catch (e) {
        let errorGuid = Guid.create().toString();
        logger.error('Error handling a request: ' + e.message, {reference: errorGuid});
        res.status(500).send({
            'status': 'PROCESSING_ERROR',
            'message': 'Internal Server Error. Try again later.',
            'reference': errorGuid
        });
    }
});