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

var ItemCollection = Backbone.Collection.extend({

  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'],

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

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

    model: Item,
    url: function() {  
      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;