var jwt = require('jsonwebtoken'); // used to create, sign, and verify tokens
var express = require("express");
var app = express();
var config = require('../config'); // get our config file
app.set('superSecret', config.secret); // secret variable
var crypto = require('crypto');
var mongoose = require('mongoose');

var userModel = mongoose.model('userModel');

var pageSize = config.pageSize;

exports.signup = function (req, res) {
    var user = new userModel({
        username: req.body.username,
        password: crypto.createHash('sha256').update(req.body.password).digest('base64'),
        shortDescription: req.body.shortDescription,
        description: req.body.description,
        email: req.body.email
    });

    user.save(function (err, user) {
        if (err) return res.status(500).send(err.message);
        //res.status(200).jsonp(user); en comptes de retoranr la data del signup, fem el login directament
        console.log("signup fet correctament, redirigint al login internament automàtic");
        exports.login(req, res);
    });
};


exports.login = function (req, res) {
    userModel.findOne({
        email: req.body.email
    })
    .select('+password')
    .exec(function (err, user) {
        if (err) throw err;
        if (!user) {
            res.json({success: false, message: 'Authentication failed. User not found.'});
        } else if (user) {
            req.body.password = crypto.createHash('sha256').update(req.body.password).digest('base64');
            if (user.password != req.body.password) {
                res.json({success: false, message: 'Authentication failed. Wrong password.'});
            } else {
                var indexToken = -1;
                for (var i = 0; i < user.tokens.length; i++) {
                    if (user.tokens[i].userAgent == req.body.userAgent) {
                        indexToken = JSON.parse(JSON.stringify(i));//stringify i parse pq es faci una còpia de la variable i, enlloc de una referència
                    }
                }
                console.log(indexToken);
                if (indexToken == -1) {//userAgent no exist
                    var tokenGenerated = jwt.sign({foo: 'bar'}, app.get('superSecret'), {
                        //  expiresIn: 86400 // expires in 24 hours
                    });
                    var newToken = {
                        userAgent: req.body.userAgent,
                        token: tokenGenerated,
                        os: req.body.os,
                        browser: req.body.browser,
                        device: req.body.device,
                        os_version: req.body.os_version,
                        browser_version: req.body.browser_version,
                        ip: req.body.ip,
                        lastLogin: Date()
                    };
                    user.tokens.push(newToken);
                } else {//userAgent already exist
                    user.tokens[indexToken].token = "";
                    var tokenGenerated = jwt.sign({foo: 'bar'}, app.get('superSecret'), {
                        //  expiresIn: 86400 // expires in 24 hours
                    });
                    user.tokens[indexToken].token = tokenGenerated;
                    user.tokens[indexToken].ip = req.body.ip;
                    user.tokens[indexToken].lastLogin = Date();
                }
                user.save(function (err, user) {
                    if (err) return res.send(500, err.message);
                    // return the information including token as JSON
                    user.password = "";
                    res.json({
                        user: user,
                        success: true,
                        message: 'Enjoy your token!',
                        token: tokenGenerated
                    });
                });
            }
        }
    });
};


exports.getAllUsers = function(req, res) {
    userModel.find()
        .limit(Number(req.query.pageSize))
        .skip(pageSize * Number(req.query.page))
        .exec(function (err, users) {
            if (err) return res.send(500, err.message);
            res.status(200).jsonp(users);
        });
};

exports.getUserById = function (req, res) {
    userModel.findOne({_id: req.params.userid})
    .lean()
    .populate('events', 'title shortDescription description img date')
    .exec(function (err, user) {
        if (err) return res.send(500, err.message);
        if (!user) {
            res.json({success: false, message: 'User not found.'});
        } else if (user) {

            res.status(200).jsonp(user);
        }
    });
};