import express = require('express');
import Security from '../src/Security';
import { SessionManager } from '../src/Session';
const router = express.Router();

function requestIsPost(req: express.Request): boolean {
    return req.method.toUpperCase() === 'POST' &&
        req.body["redirect"] &&
        req.body["username"] &&
        req.body["password"] !== undefined;
}

function extractRedirection(req: express.Request): string {
    let redir: string | undefined = undefined;

    if (requestIsPost(req))
        redir = req.body["redirect"] || undefined;
    if (!redir && req.query["redirect"]) {
        if (Array.isArray(req.query["redirect"]))
            redir = req.query["redirect"][0].toString() || undefined;
        else
            redir = req.query["redirect"]?.toString() || undefined;
	}
    return redir || "/";
}

router.all('/', async (req: express.Request, res: express.Response) => {
    let redir = extractRedirection(req);
    let loginFailed = false;

    if (requestIsPost(req)) {
        try {
            await Security.TryLogin(req.mSession, req.body["username"], req.body["password"]);
        }
        catch (err) {
            loginFailed = true;
        }
        if (!loginFailed) {
            SessionManager.Write(res, req.mSession);
            res.redirect(302, redir);
            return;
        }
	}
    res.render('login', {
        username: req.mSession.GetUsername(),
        failed: loginFailed,
        redirect: redir
    });
});

export default router;