import { default as User, DashUserModel } from './DashUserModel';
import { Request, Response, NextFunction } from 'express';
import * as passport from 'passport';
import { IVerifyOptions } from 'passport-local';
import './Passport';
import flash = require('express-flash');
import * as async from 'async';
import * as nodemailer from 'nodemailer';
import c = require('crypto');
import { emptyFunction, Utils } from '../../Utils';
import { MailOptions } from 'nodemailer/lib/stream-transport';

/**
 * GET /signup
 * Directs user to the signup page
 * modeled by signup.pug in views
 */
export let getSignup = (req: Request, res: Response) => {
    if (req.user) {
        return res.redirect('/home');
    }
    res.render('signup.pug', {
        title: 'Sign Up',
        user: req.user,
    });
};

/**
 * POST /signup
 * Create a new local account.
 */
export let postSignup = (req: Request, res: Response, next: NextFunction) => {
    req.assert('email', 'Email is not valid').isEmail();
    req.assert('password', 'Password must be at least 4 characters long').len({ min: 4 });
    req.assert('confirmPassword', 'Passwords do not match').equals(req.body.password);
    req.sanitize('email').normalizeEmail({ gmail_remove_dots: false });

    const errors = req.validationErrors();

    if (errors) {
        return res.redirect('/signup');
    }

    const email = req.body.email as String;
    const password = req.body.password;

    const model = {
        email,
        password,
        userDocumentId: Utils.GenerateGuid(),
        sharingDocumentId: Utils.GenerateGuid(),
        linkDatabaseId: Utils.GenerateGuid(),
        cacheDocumentIds: '',
    } as Partial<DashUserModel>;

    const user = new User(model);

    User.findOne({ email }, (err: any, existingUser: any) => {
        if (err) {
            return next(err);
        }
        if (existingUser) {
            return res.redirect('/login');
        }
        user.save((err: any) => {
            if (err) {
                return next(err);
            }
            req.logIn(user, err => {
                if (err) {
                    return next(err);
                }
                tryRedirectToTarget(req, res);
            });
        });
    });
};

const tryRedirectToTarget = (req: Request, res: Response) => {
    const target = (req.session as any)?.target;
    if (req.session && target) {
        res.redirect(target);
    } else {
        res.redirect('/home');
    }
};

/**
 * GET /login
 * Login page.
 */
export let getLogin = (req: Request, res: Response) => {
    if (req.user) {
        //req.session.target = undefined;
        return res.redirect('/home');
    }
    res.render('login.pug', {
        title: 'Log In',
        user: req.user,
    });
};

/**
 * POST /login
 * Sign in using email and password.
 * On failure, redirect to signup page
 */
export let postLogin = (req: Request, res: Response, next: NextFunction) => {
    req.assert('email', 'Email is not valid').isEmail();
    req.assert('password', 'Password cannot be blank').notEmpty();
    req.sanitize('email').normalizeEmail({ gmail_remove_dots: false });

    const errors = req.validationErrors();

    if (errors) {
        req.flash('errors', 'Unable to login at this time. Please try again.');
        return res.redirect('/signup');
    }

    passport.authenticate('local', (err: Error, user: DashUserModel, _info: IVerifyOptions) => {
        if (err) {
            next(err);
            return;
        }
        if (!user) {
            return res.redirect('/signup');
        }
        req.logIn(user, err => {
            if (err) {
                next(err);
                return;
            }
            tryRedirectToTarget(req, res);
        });
    })(req, res, next);
};

/**
 * GET /logout
 * Invokes the logout function on the request
 * and destroys the user's current session.
 */
export let getLogout = (req: Request, res: Response) => {
    req.logout(emptyFunction);
    const sess = req.session;
    if (sess) {
        sess.destroy(err => {
            if (err) {
                console.log(err);
            }
        });
    }
    res.redirect('/login');
};

export let getForgot = function (req: Request, res: Response) {
    res.render('forgot.pug', {
        title: 'Recover Password',
        user: req.user,
    });
};

export let postForgot = function (req: Request, res: Response, next: NextFunction) {
    const email = req.body.email;
    async.waterfall(
        [
            function (done: any) {
                c.randomBytes(20, function (err: any, buffer: Buffer) {
                    if (err) {
                        done(null);
                        return;
                    }
                    done(null, buffer.toString('hex'));
                });
            },
            function (token: string, done: any) {
                User.findOne({ email }, function (err: any, user: DashUserModel) {
                    if (!user) {
                        // NO ACCOUNT WITH SUBMITTED EMAIL
                        res.redirect('/forgotPassword');
                        return;
                    }
                    user.passwordResetToken = token;
                    user.passwordResetExpires = new Date(Date.now() + 3600000); // 1 HOUR
                    user.save(function (err: any) {
                        done(null, token, user);
                    });
                });
            },
            function (token: Uint16Array, user: DashUserModel, done: any) {
                const smtpTransport = nodemailer.createTransport({
                    service: 'Gmail',
                    auth: {
                        user: 'browndashptc@gmail.com',
                        pass: 'TsarNicholas#2',
                    },
                });
                const mailOptions = {
                    to: user.email,
                    from: 'browndashptc@gmail.com',
                    subject: 'Dash Password Reset',
                    text:
                        'You are receiving this because you (or someone else) have requested the reset of the password for your account.\n\n' +
                        'Please click on the following link, or paste this into your browser to complete the process:\n\n' +
                        'http://' +
                        req.headers.host +
                        '/resetPassword/' +
                        token +
                        '\n\n' +
                        'If you did not request this, please ignore this email and your password will remain unchanged.\n',
                } as MailOptions;
                smtpTransport.sendMail(mailOptions, function (err: Error | null) {
                    // req.flash('info', 'An e-mail has been sent to ' + user.email + ' with further instructions.');
                    done(null, err, 'done');
                });
            },
        ],
        function (err) {
            if (err) return next(err);
            res.redirect('/forgotPassword');
        }
    );
};

export let getReset = function (req: Request, res: Response) {
    User.findOne({ passwordResetToken: req.params.token, passwordResetExpires: { $gt: Date.now() } }, function (err: any, user: DashUserModel) {
        if (!user || err) {
            return res.redirect('/forgotPassword');
        }
        res.render('reset.pug', {
            title: 'Reset Password',
            user: req.user,
        });
    });
};

export let postReset = function (req: Request, res: Response) {
    async.waterfall(
        [
            function (done: any) {
                User.findOne({ passwordResetToken: req.params.token, passwordResetExpires: { $gt: Date.now() } }, function (err: any, user: DashUserModel) {
                    if (!user || err) {
                        return res.redirect('back');
                    }

                    req.assert('password', 'Password must be at least 4 characters long').len({ min: 4 });
                    req.assert('confirmPassword', 'Passwords do not match').equals(req.body.password);

                    if (req.validationErrors()) {
                        return res.redirect('back');
                    }

                    user.password = req.body.password;
                    user.passwordResetToken = undefined;
                    user.passwordResetExpires = undefined;

                    user.save(function (err) {
                        if (err) {
                            res.redirect('/login');
                            return;
                        }
                        req.logIn(user, function (err) {
                            if (err) {
                                return;
                            }
                        });
                        done(null, user);
                    });
                });
            },
            function (user: DashUserModel, done: any) {
                const smtpTransport = nodemailer.createTransport({
                    service: 'Gmail',
                    auth: {
                        user: 'browndashptc@gmail.com',
                        pass: 'TsarNicholas#2',
                    },
                });
                const mailOptions = {
                    to: user.email,
                    from: 'browndashptc@gmail.com',
                    subject: 'Your password has been changed',
                    text: 'Hello,\n\n' + 'This is a confirmation that the password for your account ' + user.email + ' has just been changed.\n',
                } as MailOptions;
                smtpTransport.sendMail(mailOptions, function (err) {
                    done(null, err);
                });
            },
        ],
        function (err) {
            res.redirect('/login');
        }
    );
};