/*Canopy - The next generation of stoner streaming software
Copyright (C) 2024-2025 Rainbownapkin and the TTN Community

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.*/

//Config
const config = require('../../config.json');

//NPM Imports
const {validationResult, matchedData} = require('express-validator');

//Local Imports
const sessionUtils = require('../utils/sessionUtils');
const altchaUtils = require('../utils/altchaUtils');
const csrfUtils = require('../utils/csrfUtils');

//register page functions
module.exports.get = async function(req, res){
    //Check for validation errors
    const validResult = validationResult(req);

    //If this request is coming from someone who's already logged in
    if(req.session.user != null){
        //Redirect them to the homepage
        return res.redirect('/');
    }

    //If there are none
    if(validResult.isEmpty()){
        //Get username from sanatized/validated data
        const {user} = matchedData(req);
        const attempts = sessionUtils.getLoginAttempts(user);

        //if we have previous attempts for this user
        if(attempts != null){
            if(attempts.count > sessionUtils.maxAttempts){
                return res.render('lockedAccount', {instance: config.instanceName, links: config.links, user: req.session.user, csrfToken: csrfUtils.generateToken(req)});
            }

            //If the users login's are being throttled
            if(attempts.count > sessionUtils.throttleAttempts){
                //Get diffuculty based on amount of attempts past the max amount
                const difficulty = attempts.count - sessionUtils.throttleAttempts;
                //Generate challenge unique to specific user, with difficulty set based on failed login attempts
                const challenge = await altchaUtils.genCaptcha(difficulty, user);

                //Render page
                return res.render('login', {instance: config.instanceName, links: config.links, user: req.session.user, challenge, csrfToken: csrfUtils.generateToken(req)});
            }
        //otherwise
        }else{
            //Render generic page
            return res.render('login', {instance: config.instanceName, links: config.links, user: req.session.user, challenge: null, csrfToken: csrfUtils.generateToken(req)});
        }
    //if we received invalid input
    }else{
        //Render pretend nothing happened, send out a generic page
        return res.render('login', {instance: config.instanceName, links: config.links, user: req.session.user, challenge: null, csrfToken: csrfUtils.generateToken(req)});
    }
}