Angular Pagination Factory

Pagination.js

app.factory("Pagination", 
	[
		'$filter', 
		function($filter){
			var Pagination = {
				    data: {
						perPage:20,
						count: 0,
						currentPage: 0,
						paginationSet: [],
						currentData: [],
						data: [],
						pagesMin : true,
						pages: 0,
						pagesMax : false
				    },
				    init: function(data, perPage){
				    	var $this = this;
				    	
				    	$this.data.perPage = perPage ? perPage : 20;
				    	$this.data.data = data;
				    	$this.data.currentData = data;
				    	$this.data.count = data.length;
				    	$this.goToPage(1);
				    },
				    update: function(){
				    	
				    },
				    
				    /**
				     * @return updates paginationSet and currentPage
				     * @return triggers $this.buildButtons
				     */
				    goToPage: function(index){
				    	var $this = this;
				    	
				    	var pageStart = ($this.data.perPage * index) - $this.data.perPage;
				    	var pageEnd = $this.data.perPage * index;
				    	
				    	$this.data.currentPage = index;
				    	$this.data.paginationSet = $this.data.currentData.slice(pageStart, pageEnd);
				    	
				    	$this.buildButtons();
				    },
				    
				    
				    /**
				     * @param: sortOptions @optional object
				     *  { 
				     *  	type : value,
				     *  	reverse : boolean
				     *  }
				     * 
				     * @param: filterOptions @optional object
				     * 	{ 
				     * 		filterName : filterValue,
				     * 		... 
				     *  }
				     */
				    updateSort: function(sortOptions, filterOptions){
				    	console.log('updateSort', sortOptions, filterOptions);
				    	var $this = this;
				    	
				    	$this.data.currentData = $filter('orderBy')($this.data.data, sortOptions.type, sortOptions.reverse);
				    	
				    	_.each(filterOptions, function(v, k){
				    		console.log('Sorting by ' + k + " : " + v);
				    		$this.data.currentData = $filter('filter')($this.data.currentData, v);
				    	});
				    	
				    	$this.goToPage(1);
				    },
				    
				    
				    /**
				     * @return updates pagesMin, pages, pagesCurrent, and pagesMax
				     */
				    buildButtons: function(){
				    	var $this = this;
				    	
				    	$this.data.pages = Math.ceil( ($this.data.currentData.length / 20) );
				    	if($this.data.currentPage <= 1)
				    		$this.data.pagesMin = true;
				    	else
				    		$this.data.pagesMin = false;
				    	
				    	if($this.data.currentPage >= $this.data.pages)
				    		$this.data.pagesMax = true;
				    	else
				    		$this.data.pagesMax = false;
				    	
				    	var pageArray = [];
				    	for(i=0; i<$this.data.pages; i++){
				    		pageArray.push(i+1);
				    	}
				    	$this.data.pages = pageArray;
				    }
			};
		
			return Pagination;
		} 
	]
);