var Backbone = require('backbone'),
    Item = require('./item'),
    Globals = require('../globals');

var ItemCollection = Backbone.Collection.extend({

    initialize: function() {
        $.ajaxPrefilter(
            function(options, originalOptions, jqXHR) {
                options.xhrFields = {
                    withCredentials: true
                }
            }
        );
    },
    setTotalCount: function(total) {
        this.totalCount = total;
    },
    addFilter: function(name, value) {
        this.filters = this.filters || {};
        this.filters[name] = value;
    },
    clearFilter: function() {
        this.filters = [];
    },
    setLimit: function(limit) {
        this.queryLimit = limit;
    },

    setOffset: function(offset) {
        this.offset = offset;
    },

    classificationTypeUrlParts: ['', 'section', 'category', 'sub_category', 'item_group'],

    setClassificationType: function(type) {
        this.classificationType = type;
    },

    setClassificationId: function(id) {
        this.classificationId = id;
    },

    setFromCart: function(fromCart) {
        this.fromCart = fromCart;
    },

    model: Item,
    url: function() {
        if (this.fromCart === true) {
            return Globals.ApiUrl + "/cart/item/display";
        }

        var path = '/item';

        if (this.classificationType > 0) {
            // eg. http://localhost:4567/item/section/1/offset/0/limit/10
            var urlPart = this.classificationTypeUrlParts[this.classificationType];
            path += "/" + urlPart + "/" + this.classificationId;
        } // else eg. http://localhost:4567/item/offset/0/limit/10
        path += "/offset/" + this.offset + "/limit/" + this.queryLimit;

        var queryParts = [];

        for (var key in this.filters) {
            if (this.filters.hasOwnProperty(key)) {
                queryParts.push(key + '=' + this.filters[key]);
            }
        }
        var query = '';

        if (queryParts.length > 0) {
            query = '?' + queryParts.join('&');
        }

        return Globals.ApiUrl + path + query;
    }
});

module.exports = ItemCollection;