import ApplicationComponent from "../ApplicationComponent";
import {Express, NextFunction, Request, Response, Router} from "express";
import AuthGuard from "./AuthGuard";
import Controller from "../Controller";
import {ForbiddenHttpError} from "../HttpError";

export default class AuthComponent extends ApplicationComponent<void> {
    private readonly authGuard: AuthGuard<any>;

    public constructor(authGuard: AuthGuard<any>) {
        super();
        this.authGuard = authGuard;
    }

    public async start(app: Express, router: Router): Promise<void> {
        router.use(async (req, res, next) => {
            req.authGuard = this.authGuard;
            res.locals.user = await req.authGuard.getUserForSession(req.session!);
            next();
        });
    }

    public async stop(): Promise<void> {
    }
}

export const REQUIRE_REQUEST_AUTH_MIDDLEWARE = async (req: Request, res: Response, next: NextFunction): Promise<void> => {
    if (!await req.authGuard.isAuthenticatedViaRequest(req)) {
        req.flash('error', `You must be logged in to access ${req.url}.`);
        res.redirect(Controller.route('auth') || '/');
        return;
    }
    
    req.models.user = await req.authGuard.getUserForRequest(req);
    next();
};

export const REQUIRE_AUTH_MIDDLEWARE = async (req: Request, res: Response, next: NextFunction): Promise<void> => {
    if (await req.authGuard.isAuthenticatedViaRequest(req)) {
        req.models.user = await req.authGuard.getUserForRequest(req);
        next();
    } else {
        if (!await req.authGuard.isAuthenticated(req.session!)) {
            req.flash('error', `You must be logged in to access ${req.url}.`);
            res.redirect(Controller.route('auth') || '/');
            return;
        }

        req.models.user = await req.authGuard.getUserForSession(req.session!);
        next();
    }
};
export const REQUIRE_GUEST_MIDDLEWARE = async (req: Request, res: Response, next: NextFunction): Promise<void> => {
    if (await req.authGuard.isAuthenticated(req.session!)) {
        res.redirectBack('/');
        return;
    }

    next();
};
export const REQUIRE_ADMIN_MIDDLEWARE = async (req: Request, res: Response, next: NextFunction): Promise<void> => {
    if (!req.models.user || !req.models.user.isAdmin()) {
        throw new ForbiddenHttpError('secret tool', req.url);
    }

    next();
};