var mongoose = require('mongoose');
var uniqueValidator = require('mongoose-unique-validator');
var slug = require('slug');
var User = mongoose.model('User');

var ProductSchema = new mongoose.Schema({
    ordering: Number,
    title: String,
    slug: { type: String, lowercase: true, unique: true },
    prime_achat: Number,
    prime_vente: Number,
    metal: { type: mongoose.Schema.Types.ObjectId, ref: 'Metal' },
    poids: Number,
    author: { type: mongoose.Schema.Types.ObjectId, ref: 'User' },
    favoritesCount: { type: Number, default: 0 }
}, {timestamps: true, toJSON: {virtuals: true}});

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

ProductSchema.pre('validate', function (next) {
    if (!this.slug) {
        this.slugify();
    }
    next();
});

ProductSchema.methods.slugify = function () {
    this.slug = slug(this.title) + '-' + (Math.random() * Math.pow(36, 6) | 0).toString(36);
};

ProductSchema.methods.updateFavoriteCount = function () {
    var product = this;

    return User.count({ favorites: { $in: [product._id] } }).then(function (count) {
        product.favoritesCount = count;

        return product.save();
    });
};

ProductSchema.methods.toJSONFor = function(user){
    return {
        ordering: this.ordering,
        title: this.title,
        slug: this.slug,
        prime_achat: this.prime_achat,
        prime_vente: this.prime_vente,
        metal: this.metal.toJSONFor(),
        poids: this.poids,
        createdAt: this.createdAt,
        updatedAt: this.updatedAt,
        favorited: user ? user.isFavorite(this._id) : false,
        favoritesCount: this.favoritesCount,
        author: this.author.toProfileJSONFor(user)
    };
};

mongoose.model('Product', ProductSchema);