const testPassword = require('model').PasswordField.testSync;
const User = require('./models.js');
const getUrl = require('create-url').getUrl;
const mail = require('mail');
const pug = require('pug');
const config = require('settings/config');

let SIGNUP_ERRORS = {
    USERNAME_ALREADY_EXISTS: "The username you want is already used.",
    EMAIL_ALREADY_EXISTS: "The email you want is already used.",
    UNKOWN_ERROR: "Something weird happened, i'm sorry :'(",
};

module.exports.redirectIfNotLogged = function(redirectionPage, toDecorate) {
    return function(req, res, render) {
        if (req.session.user === undefined) {
            req.session.redirectAfterLog = redirectionPage;
            req.session.save();
            res.redirect(getUrl('login'));
            return;
        }

        return toDecorate(...arguments);
    };
}

module.exports.login = function(req, res, render) {
    if (req.session.loginFailed !== undefined) {
        res.locals.loginFailed = req.session.loginFailed;
        req.session.loginFailed = undefined;
        req.session.save();
    }
    render('login.pug');
}

module.exports.signup = function(req, res, render) {
    if (req.session.signupFailed !== undefined) {
        res.locals.signupFailed = req.session.signupFailed;
        req.session.signupFailed = undefined;
        req.session.save();
    }
    render('signup.pug');
}

module.exports.logout = function(req, res, render) {
    req.session.user = undefined;
    req.session.save();
    res.redirect(getUrl("index"));
}

function logUser(user, password, req, res, render) {
    if (testPassword(password, user.password)) {
        req.session.user = user;

        let redirection = req.session.redirectAfterLog || 'index';
        req.session.redirectAfterLog = undefined;
        req.session.save();

        res.redirect(getUrl(redirection));
    } else {
        req.session.loginFailed = true;
        req.session.save();
        res.redirect(getUrl('login'));
    }

}

module.exports.loginTarget = function(req, res, render) {
    User.getByUsername(req.body.username, (err, user) => {
        if (user === undefined || !user.active) {
            // Try with email address
            User.getByEmail(req.body.username, (err, user) => {
                if (user === undefined || !user.active) {
                    res.redirect(getUrl('login'));
                } else {
                    return logUser(user, req.body.password, req, res, render);
                }
            });
        } else {
            return logUser(user, req.body.password, req, res, render);
        }
    });
}

module.exports.signupTarget = function(req, res, render) {
    let user = new User();
    user.username = req.body.username;
    user.email = req.body.email;
    user.password = req.body.password;

    require('crypto').randomBytes(48, function(err, buffer) {
        user.activationKey = buffer.toString('hex');
        user.save((err) => {

            if (err !== undefined) {

                let error = SIGNUP_ERRORS.UNKOWN_ERROR;
                switch (err.constraint) {
                    case 'auth_user_email_key':
                        error = SIGNUP_ERRORS.EMAIL_ALREADY_EXISTS;
                        break;
                    case 'auth_user_username_key':
                        error = SIGNUP_ERRORS.USERNAME_ALREADY_EXISTS;
                        break;

                }

                req.session.signupFailed = error;
                req.session.save();

                return res.redirect(getUrl('signup'));
            }

            res.locals.user = user;

            let baseUrl =
                req.headers.referer.split('/').slice(0, 3).join('/') + '/'

            res.locals.activationUrl =
                baseUrl + 'activate/' + user.activationKey;

            let html = pug.renderFile(
                __dirname + '/templates/validationMail.pug',
                res.locals,
            );

            mail({
                from: config.MAIL.FROM,
                to: user.username + ' <' + user.email + '>',
                subject: 'Welcome on ADEjs!',
                text:'',
                attachment: [
                    {data: html, alternative: true}
                ]
            }, (err, result) => {
                res.redirect(getUrl('mailWasSent'));
            });

        });
    });
}

module.exports.mailWasSent = function(req, res, render) {
    render('mailWasSent.pug');
}

module.exports.activate = function(req, res, render, next) {
    User.getByActivationKey(req.params.activationKey, (err, user) => {
        if (user === undefined || user.active) {
            return next();
        }

        user.active = true;
        user.activationKey = undefined;
        user.save((err, user) => {
            req.session.user = user;
            req.session.save();
            res.redirect(getUrl('calendarSettings'));
        });
    });
}

module.exports.passwordForgotten = function(req, res, render, next) {
    if (req.session.passwordForgottenFailed) {
        res.locals.passwordForgottenFailed = req.session.passwordForgottenFailed;
        req.session.passwordForgottenFailed = undefined;
        req.session.save();
    }
    render('passwordForgotten.pug');
}

module.exports.passwordForgottenTarget = function(req, res, render, next) {
    User.getByEmail(req.body.email, (err, user) => {
        if (err !== undefined) {
            req.session.passwordForgottenFailed = true;
            req.session.save();
            return res.redirect(getUrl('passwordForgotten'));
        }

        require('crypto').randomBytes(48, function(err, buffer) {
            user.activationKey = buffer.toString('hex');
            user.save();

            if (!user.active) {
                req.session.passwordForgottenFailed = true;
                req.session.save();
                return res.redirect(getUrl('passwordForgotten'));
            }

            res.locals.user = user;

            let baseUrl =
                req.headers.referer.split('/').slice(0, 3).join('/') + '/'

            res.locals.resetUrl =
                baseUrl + 'reset-password/' + user.activationKey;

            let html = pug.renderFile(
                __dirname + '/templates/resetPasswordMail.pug',
                res.locals,
            );

            mail({
                from: config.MAIL.FROM,
                to: user.username + ' <' + user.email + '>',
                subject: 'Welcome on ADEjs!',
                text:'',
                attachment: [
                    {data: html, alternative: true}
                ]
            }, (err, result) => {
                res.redirect(getUrl('resetPasswordMailWasSent'));
            });

        });

    });
}

module.exports.resetPasswordMailWasSent = function(req, res, render, next) {
    render('resetPasswordMailWasSent.pug');
}

module.exports.resetPassword = function(req, res, render, next) {

    User.getByActivationKey(req.params.activationKey, (err, user) => {
        if (user === undefined || !user.active) {
            return next();
        }

        res.locals.user = user;
        render('resetPassword.pug');
    });

}

module.exports.resetPasswordTarget = function(req, res, render, next) {

    User.getByActivationKey(req.body.activationKey, (err, user) => {

        if (user === undefined || !user.active) {
            return next();
        }

        user.password = req.body.password;
        user.activationKey = undefined;
        user.save(() => {
            req.session.user = user;
            req.session.save();
            res.redirect(getUrl('index'));
        });
    });
}