var mongoose = require('mongoose');
var uniqueValidator = require('mongoose-unique-validator');
var crypto = require('crypto');
var jwt = require('jsonwebtoken'),
    secret = require('../../config').secret,
    session_lifetime = require('../../config').session_lifetime;

var UserSchema = new mongoose.Schema({
    email: { type: String, lowercase: true, unique: true, required: [true, "email can't be blank"], match: [/\S+@\S+\.\S+/, 'is invalid'], index: true },
    username: { type: String, lowercase: true, unique: true, required: [true, "username can't be blank"], match: [/^[a-zA-Z0-9_]+$/, 'is invalid'], index: true },
    role: String,
    firstname: { type: String, required: [true, "firstname can't be blank"] },
    lastname: { type: String, required: [true, "lastname can't be blank"] },
    phone: String,
    licence: Number,
    poids: Number,
    image: String,
    bg_image: String,
    favorites: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Product' }],
    following: [{ type: mongoose.Schema.Types.ObjectId, ref: 'User' }],
    hash: String,
    salt: String
}, { timestamps: true, toJSON: { virtuals: true } });

UserSchema.plugin(uniqueValidator, { message: 'is already taken.' });

UserSchema.methods.validPassword = function (password) {
    let hash = crypto.pbkdf2Sync(password, this.salt, 10000, 512, 'sha512').toString('hex');
    return this.hash === hash;
};

UserSchema.methods.setPassword = function (password) {
    this.salt = crypto.randomBytes(16).toString('hex');
    this.hash = crypto.pbkdf2Sync(password, this.salt, 10000, 512, 'sha512').toString('hex');
};

UserSchema.methods.generateJWT = function () {
    var today = new Date();
    var exp = new Date(today.getTime() + (session_lifetime * 1000));

    return jwt.sign({
        id: this._id,
        username: this.username,
        exp: parseInt(exp.getTime() / 1000)
    }, secret, { algorithm: 'HS256' });
};

UserSchema.methods.toAuthJSON = function () {
    return {
        id: this._id,
        email: this.email,
        role: this.role,
        token: this.generateJWT(),
        firstname: this.firstname,
        lastname: this.lastname,
        phone: this.phone,
        licence: this.licence,
        poids: this.poids,
        username: this.username,
        image: this.image || '/assets/images/users/user.jpg',
        bg_image: this.bg_image || '/assets/images/users/bg_user.jpg'
    };
};

UserSchema.methods.toJSONFor = function () {
    return {
        email: this.email,
        role: this.role,
        firstname: this.firstname,
        lastname: this.lastname,
        phone: this.phone,
        licence: this.licence,
        poids: this.poids,
        username: this.username,
        image: this.image || '/assets/images/users/user.jpg',
        bg_image: this.bg_image || '/assets/images/users/bg_user.jpg'
    };
};

UserSchema.methods.toProfileJSONFor = function (user) {
    return {
        email: this.email,
        firstname: this.firstname,
        lastname: this.lastname,
        phone: this.phone,
        licence: this.licence,
        poids: this.poids,
        username: this.username,
        image: this.image || '/assets/images/users/user.jpg',
        bg_image: this.bg_image || '/assets/images/users/bg_user.jpg',
        following: user ? user.isFollowing(this._id) : false
    };
};

UserSchema.methods.favorite = function (id) {
    if (this.favorites.indexOf(id) === -1) {
        this.favorites.push(id);
    }

    return this.save();
};

UserSchema.methods.unfavorite = function (id) {
    this.favorites.remove(id);
    return this.save();
};

UserSchema.methods.isFavorite = function (id) {
    return this.favorites.some(function (favoriteId) {
        return favoriteId.toString() === id.toString();
    });
};

UserSchema.methods.follow = function (id) {
    if (this.following.indexOf(id) === -1) {
        this.following.push(id);
    }

    return this.save();
};

UserSchema.methods.unfollow = function (id) {
    this.following.remove(id);
    return this.save();
};

UserSchema.methods.isFollowing = function (id) {
    return this.following.some(function (followId) {
        return followId.toString() === id.toString();
    });
};

mongoose.model('User', UserSchema);