'use strict';

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const MD5 = require('crypto-js/md5');

function setPassword(password) {
    return this.encryptPassword(password);
};

function validateUserNameField(userName, cb) {
    this.model('User').find({ userName: userName }, { _id: 0, userName: 1 }).count((err, val) => {
        cb(val == 0);
    });
};

function validateEmailField(email, cb) {
    this.model('User').find({ email: email }, { _id: 0, email: 1 }).count((err, val) => {
        cb(val == 0);
    });
};

const UserSchema = new Schema({
    userName: {
        type: String,
        required: true,
        validate: {
            validator: validateUserNameField,
            message: 'User with name {VALUE} has been already added.'
        }
    },
    email: {
        type: String,
        required: true,
        validate: {
            validator: validateEmailField,
            message: 'User with email {VALUE} has been already added.'
        }
    },
    password: {
        type: String,
        set: setPassword,
        required: true
    },
    firstName: {
        type: String,
        required: false
    },
    lastName: {
        type: String,
        required: false
    }
});

UserSchema.methods.comparePassword = function (password) {
    return this.password == this.encryptPassword(password);
};

UserSchema.methods.encryptPassword = function (password) {
    return MD5(password);
};

module.exports = mongoose.model('User', UserSchema);