/**
 * jqPageFlow v0.1b - jQuery plugin
 * Copyright (c) 2009 Barry Roodt (http://calisza.wordpress.com)
 *
 * Licensed under the New BSD license.
 *
 * This plugin makes scrolling pagination possible (such as that found on Google Reader and dzone.com).
 * An example can be found at http://flexidev.co.za/projects/jqpageflow
 * Please check http://code.google.com/p/flexidev/downloads/ for the latest version
 *
 * Special thanks to Christopher Mills (http://imod.co.za) for the help with naming and promoting this plugin
 *
 */

;
(function($){
    $.flexiPagination = {

        defaults: {
            url: "",
            currentPage: 1,
            totalResults: 100,
            perPage: 25,
            container: "body",
            pagerVar : "p",
            loaderImgPath: "images/loading11.gif",
            debug : 0
        }

    };
    
    $.fn.extend({
        flexiPagination:function(config) {
            // initialize our config object
            var config = $.extend({}, $.flexiPagination.defaults, config);
            var loading = false;
			
            // create and append our progress indicator div to the body content, then make sure our css is applied
            if ( !$("#jqpageflow-block").length ){
                $("body").append("<div id='jqpageflow-block'><div><span id='jqpageflow-text'></span><br /><img src='" + config.loaderImgPath + "' /></div></div>");
                $("#jqpageflow-block").addClass("jqpageflow-loader");
                var winW = $(window).width();
                $('.jqpageflow-loader').css('left', winW/2-$('.jqpageflow-loader').width()/2);
            }
            
            // set default container element as body if config var is empty
            config.container = (config.container != "") ? config.container : "body";
   			
   			
   			
            //if (config.debug)
            //console.log("Current Page : %s", config.currentPage);
   			
            // bind the window's scroll event to a custom function
            $(window).scroll(function(){
                // work out whether we need to fire our ajax call or not
                var scroll = ($(document).height() - $(window).height()) - 15
                if ( config.currentPage >= 1 && (config.perPage * (config.currentPage) < config.totalResults)  
                    && !loading && $(window).scrollTop() > scroll) {
		           
                    // this automatically prevents any further attempts to execute another ajax call until the current ajax call has returned a result
                    loading = true;
		           
                    // set a default url if none specified. 
                    // Note: this needs to be calculated just before the ajax call since our currentPage counter is updated each time the event is executed 
                    if (config.url != "") {
                        config.url += (config.url.indexOf("?")!==-1 ? "&" : "?") + config.pagerVar + "=" + (config.currentPage + 1);
                    } else {
                        // the default url is the current window location with the pageVar and currentPage values attached
                        config.url = window.location + (window.location.search != '' ? "&" : "?") + config.pagerVar + "=" + ( config.currentPage + 1 );
                    }
					
                    //if (config.debug)
                    //console.log("Generated Url : %s", config.url);
		           
                    // update the loader text and display the loader.
                    $("#jqpageflow-text").text('Carregando resultados ' + (config.perPage * ((config.currentPage > 0) ? config.currentPage : 1)) + ' de ' + config.totalResults);
                    $(".jqpageflow-loader").css('top',$(window).height()-200)
                    $("#jqpageflow-block").show();
		           
                    // execute our ajax call and deal with the result.
                    $.ajax({
                        type: "GET",
                        dataType: "html",
                        url: config.url,
                        success: function( html ){
		               	   
                            html = $.trim( html );
		
                            if ( html ) {
                                $(config.container).append( html );
                                config.currentPage++;
		                       
                            } else {
                                // prevent any further attempts to execute the ajax call since the backend is not returning a useable result.
                                config.currentPage = -1;
                            }
							
                        /* if (config.debug) {
								console.log("Current Page : %s", config.currentPage);
								console.log("Per Page : %s", config.perPage);
								console.log("Total Results : %s", config.totalResults);
							}
							*/
                        },
                        complete: function(){
                            // allow ajax call to be executed again if necessary and hide the loader
                            loading = false;
                            $("#jqpageflow-block").hide();
		                   
                        }
                    });
                }
            });
			
            return this;
        }
    });
	
})(jQuery);