const express = require('express');

const userApp = express();

const libs = `${process.cwd()}/libs`;

const config = require(`${libs}/config`);

const log = require(`${libs}/log`)(module);

const User = require(`${libs}/models/user`);

const jwt = require('jwt-simple');

const required_fields = ["email", "password", "name", "cpf", "schooling", "segment", "role", "institution_name", "state", "city"];


function emailSyntax(email) {
    const regex = /^(([^<>()\[\]\.,;:\s@\"]+(\.[^<>()\[\]\.,;:\s@\"]+)*)|(\".+\"))@(([^<>()[\]\.,;:\s@\"]+\.)+[^<>()[\]\.,;:\s@\"]{2,})$/i;
    return regex.test(email);
}

userApp.post('/', (req, res, next) => {
    if(req.body.email){
        if(!emailSyntax(req.body.email)){
            res.status(400);
            res.json({success: false, msg: 'O email informado é inválido.'});
        } else {
            next();
        }
    } else {
        next();
    }
},
 (req, res, next) => {
    User.count({'email': req.body.email}, function(err, count){
        if (err){
            log.error('MongoDB error: ' + err);
            res.status(500);
            res.json({success: false, msg: ['Um erro ocorreu no banco de dados.']});
        }
        if(count){
            res.status(400);
            res.json({success: false, msg: 'O email informado já está cadastrado.'});
        } else {
            next();
        }
    });

}, (req, res, next) => {
    User.count({'cpf': req.body.cpf}, function(err, count){
        if (err){
            log.error('MongoDB error: ' + err);
            res.status(500);
            res.json({success: false, msg: ['Um erro ocorreu no banco de dados.']});
        }
        if(count){
            res.status(400);
            res.json({success: false, msg: 'O CPF informado já está cadastrado.'});

        } else {
            next();
        }
    });

}, (req, res, next) => {
    var newUser = new User({
        email: req.body.email,
        password: req.body.password,
        name: req.body.name,
        cpf: req.body.cpf,
        schooling: req.body.schooling,
        course: req.body.course,
        segment: req.body.segment,
        role: req.body.role,
        institution_name: req.body.institution_name,
        state: req.body.state,
        city: req.body.city,
        receive_emails: req.body.receive_emails
    });

    // save the user
    newUser.save((err) => {
        if (err){
            let errArray = [];
            let errMsg = '';
            for (var e in err.errors) {
                    errArray.push(err.errors[`${e}`].message);
            }
            res.status(400);
            res.json({success: false, msg: errArray});
        }
         else {
            res.status(201);
            res.json({success: true, msg: 'Usuário cadastrado com sucesso!'});
        }
    });
});

userApp.post('/authenticate', (req, res, next) => {
    if (!req.body.email) {
        res.status(400);
        res.json({success: false, msg: 'O campo Email é obrigatório.'});
    } else {
        next();
    }

}, (req, res, next) => {
    if (!req.body.password) {
        res.status(400);
        res.json({success: false, msg: 'O campo Senha é obrigatório.'});
    } else {
        next();
    }

}, (req, res, next) => {
    User.findOne({
        email: req.body.email
    }, (err, user) => {
        if (err) throw err;

        if(!user){
            res.status(400);
            res.json({success: false, msg: ['O Email informado não está cadastrado.']});
        }
        else {
            user.comparePassword(req.body.password, (err, isMatch) => {
                if (isMatch && !err) {
                    var secret = config.mongodb.secret;

                    // if user is found and password is right create a token
                    var token = jwt.encode(user, secret);

                    //returns user info including token as json
                    res.json({success: true, token: 'JWT ' + token, msg: 'Usuário autenticado com sucesso'});
                }
                else {
                    res.status(400);
                    res.json({success: false, msg: ['A Senha informada é inválida.']});
                }
            });
        }
    });
});

module.exports = userApp;