/* 
jQuery Ajax Paginator
Author : Simon Ilett
Version 1.22
 
*/

/*
v1.22 changes

defaults.xString 
Allows you to pass extra params through the ajax query at anytime.
*/

function Paginator (url, options) {
	
	// Becomes this.options
	var defaults = {
		xParams : {},
		qString : '?p=',
		items:10,
		controls: 'pagination_control_wrapper',
		content: 'pagination_content_wrapper',
        container: 'pagination_container',
		cache: false,
		duration: 800,
		timer: 500
	}
	
	this.options 	= jQuery.extend(defaults, options);
	
	this.init = function() {
		this.pControls = $('#'+this.options.controls);
		this.lrControls = $('#'+this.options.container+" .lr");		
        this.pContent 	= $('#'+this.options.content);
		this.newRequest = true;	
		this.lastHash 	= false;
		this.lastPage	= 1;
		if (this.options.cache) 
			this.cache 	= $empty;
		// Check Hash
		this.isHashed();
		// Set pagination click events 	
		if(this.pControls) 
			this.paginationEvents(this.pControls);
		if(this.lrControls) 
			this.paginationEvents(this.lrControls);	 
    };
	
	this.paginationEvents = function(controls) {	
		var obj = this;
		controls.click(function(e) {
			e.preventDefault();
			obj.loadPage(e.target);
		});
	};
	
	// Initial load check for a hash to load.
	this.isHashed = function() {	
        
        if (window.location.hash.indexOf('#')>-1){
            this.loadHash(this.stripHash());
        }
        
        //this.loadHash(this.stripHash());
        
		var obj = this;
		setInterval(function () { obj.hashPage(); }, this.options.timer);
	};
	
	// Periodical check for a new hash value to simulate back button ajax action
	this.hashPage = function() {
		var hash = this.stripHash();
		if(this.lastHash && this.lastHash!=hash) {
			this.loadHash(hash);	
		}
	};
	
	this.loadPage = function(el) {
        var tmpURL = (typeof(el)=='object' ? el.href : el),
		dataArray = this.splitURL(tmpURL),
		hash = dataArray[1];
		if (this.lastHash && this.lastHash == hash) return;
		if (this.newRequest) {
			this.newRequest = false;
			this.lastHash = window.location.hash = hash;
			this.getData(tmpURL);
		}
	};
	
	this.getData = function(url) {
		var obj = this;
		var theCallback = function (response) {
			obj.newPagination(response);
		}; 
		//var params =  jQuery.extend({ 'items' : this.options.items, 'current' : this.lastPage, 'qString' : this.options.qString}, this.options.xParams);
        var params =  jQuery.extend({'current' : this.lastPage}, this.options.xParams);
        $.getJSON(url, params, theCallback);
		
	};
	
	this.newPagination = function(res) {
		this.newRequest = true;
		this.pControls.html(res.pagination);
		// Prevents the append bug when multiple requests are fired.
		this.pContent.html('<div style="position:relative;">' + this.pContent.html() + '</div>' + res.page);
		
		var first = this.pContent.find("div:first"),
		last = this.pContent.find("div:last");
        
        // Handle left/right Links
    	var pageright = this.pControls.find("a.right").attr('href')||'';
		var right = $("#pagination_container").find("a.right");
		if (pageright == ''){
			right.hide();
		}
		else{
			right.attr('href',pageright);
			right.show();
		}
    	var pageleft = this.pControls.find("a.left").attr('href')||'';
		var left = $("#pagination_container").find("a.left");
		if (pageleft == ''){
			left.hide();
		}
		else{
			left.attr('href',pageleft);
			left.show();
		}	        
	    
        if (ajaxgetpage_animation = 'fade'){
		    if (first[0]!=last[0]) {
	            // Fade in / out
	            first.fadeOut('fast', function(){
		            last.fadeIn('fast', function(){
		                first.remove();
	                });
	            });            
		    }            
        }
        else{
		    // The previous node (old page) is moving either shift left = -750, shift right = 750;
		    if (first[0]!=last[0]) {
			    var firstLeft = this.convert(last.css("left").replace('px',''));
			    first.animate({'left':firstLeft, opacity:0}, this.options.duration, function() {
				    first.remove();
			    });
		    }
		    last.animate({'left':'0'}, this.options.duration);            
        }
    

		
		this.lastPage = res.current;
	};

	/* Loaders */
	
	// Load a page number 1,2,3 or next, prev, last, first
	this.pLoad = function (n) {
		this.loadPage($('#page_'+n).attr('href'));
	};
	// Load a page by full URL, if known
	this.hLoad = function (n) {
		this.loadPage(this.pUrl + this.options.qString + n);
	};
	// Load the current hashed page
	this.loadHash = function (hash) {
		if (hash) 
			this.loadPage(this.pUrl + '?' + hash);	
		else 
			this.hLoad('1');
	};
	
	/* Helpers */
	this.splitURL = function(o) {
		return o.split('?');
	};
	this.stripHash = function() {
		return window.location.hash.replace('#','');
	};
	this.convert = function(n) {
		return n*-1;
	};
	
    this.pUrl 		= url;
    this.init();
}