import Controller from "wms-core/Controller";
import AuthComponent, {RequireAuthMiddleware, RequireGuestMiddleware} from "wms-core/auth/AuthComponent";
import {Request, Response} from "express";
import Validator, {InvalidFormatValidationError, ValidationBag} from "wms-core/db/Validator";
import UserPasswordComponent, {PasswordAuthProof} from "../models/UserPasswordComponent";
import UserNameComponent, {USERNAME_REGEXP} from "../models/UserNameComponent";
import _AuthController from "wms-core/auth/AuthController";
import {NotFoundHttpError, ServerError} from "wms-core/HttpError";
import {AuthError, PendingApprovalAuthError, RegisterCallback} from "wms-core/auth/AuthGuard";
import User from "wms-core/auth/models/User";
import Throttler from "wms-core/Throttler";

export default class AuthController extends _AuthController {
    public routes(): void {
        this.get('/login', this.getLogin, 'auth', RequireGuestMiddleware);
        this.post('/login', this.postLogin, 'auth', RequireGuestMiddleware);
        this.get('/register', this.getRegister, 'register', RequireGuestMiddleware);
        this.post('/register', this.postRegister, 'register', RequireGuestMiddleware);
        this.post('/logout', this.postLogout, 'logout', RequireAuthMiddleware);
    }

    protected async getLogin(req: Request, res: Response): Promise<void> {
        res.render('login');
    }

    protected async postLogin(req: Request, res: Response): Promise<void> {
        await this.validate({
            username: new Validator().defined().exists(User, 'name'),
            password: new Validator().acceptUndefined(),
        }, req.body);

        const user = await User.select()
            .where('name', req.body.username)
            .first();

        if (!user) throw new NotFoundHttpError(`Couldn't find a user with name ${req.body.username}`, req.url);

        if (!req.session) throw new ServerError('Session not initialized.');

        const passwordAuthProof = PasswordAuthProof.createProofForLogin(req.session);
        passwordAuthProof.setResource(user);

        await passwordAuthProof.authorize(req.body.password);
        try {
            await this.getApp().as(AuthComponent).getAuthGuard().authenticateOrRegister(req.session, passwordAuthProof);
        } catch (e) {
            if (e instanceof AuthError) {
                Throttler.throttle('login_failed_attempts_user', 3, 180000, <string>user.getOrFail('name'), 1000, 60000);
                Throttler.throttle('login_failed_attempts_ip', 5, 60000, req.ip, 1000, 60000);

                if (e instanceof PendingApprovalAuthError) {
                    req.flash('error', 'Your account is still being reviewed.');
                    res.redirectBack();
                    return;
                } else {
                    const bag = new ValidationBag();
                    const err = new InvalidFormatValidationError('Invalid password.');
                    err.thingName = 'password';
                    bag.addMessage(err);
                    throw bag;
                }
            } else {
                throw e;
            }
        }

        req.flash('success', `Welcome, ${user.name}.`);
        res.redirect(Controller.route('home'));
    }

    protected async getRegister(req: Request, res: Response): Promise<void> {
        res.render('register');
    }

    protected async postRegister(req: Request, res: Response): Promise<void> {
        Throttler.throttle('register_password', 10, 30000, req.ip);

        await this.validate({
            username: new Validator().defined().between(3, 64).regexp(USERNAME_REGEXP).unique(User, 'name'),
            password: new Validator().defined().minLength(8),
            password_confirmation: new Validator().defined().sameAs('password', req.body.password),
            terms: new Validator().defined(),
        }, req.body);

        if(!req.session) throw new ServerError('Session not initialized.');

        const passwordAuthProof = PasswordAuthProof.createAuthorizedProofForRegistration(req.session);
        try {
            await this.getApp().as(AuthComponent).getAuthGuard().authenticateOrRegister(req.session, passwordAuthProof,
                undefined, async (connection, user) => {
                    passwordAuthProof.setResource(user);

                    const callbacks: RegisterCallback[] = [];

                    // Password
                    await user.as(UserPasswordComponent).setPassword(req.body.password);

                    // Username
                    user.as(UserNameComponent).name = req.body.username;

                    return callbacks;
                });
        } catch (e) {
            if (e instanceof PendingApprovalAuthError) {
                req.flash('info', `Your account was successfully created and is pending review from an administrator.`);
                res.redirect(Controller.route('home'));
                return;
            } else {
                throw e;
            }
        }

        const user = await passwordAuthProof.getResource();

        req.flash('success', `Your account was successfully created! Welcome, ${user?.as(UserNameComponent).name}.`);
        res.redirect(Controller.route('home'));
    }

    protected async getCheckAuth(): Promise<void> {
        throw new ServerError('Not implemented.');
    }

    protected async postAuth(): Promise<void> {
        throw new ServerError('Not implemented.');
    }
}