/**
 * This jQuery plugin displays pagination links inside the selected elements.
 *
 * @author Gabriel Birke (birke *at* d-scribe *dot* de)
 * @version 1.2
 * @param {int} maxentries Number of entries to paginate
 * @param {Object} opts Several options (see README for documentation)
 * @return {Object} jQuery Object
 */
jQuery.fn.pagination = function(objToPaginate, opts){
	opts = jQuery.extend({
		items_per_page:10,
		num_display_entries:10,
		current_page:0,
		num_edge_entries:0,
		link_to:"#",
		prev_text:"Prev",
		next_text:"Next",
		ellipse_text:"...",
		qpSeparator:"/",
		counterPage:0,
		prev_show_always:true,
		next_show_always:true,
		callback:function(){return false;}
	},opts||{});
	
	return this.each(function() {
		
		maxentries = objToPaginate.children().length;
		objToPaginate.data('maxentries',maxentries);
			
		/**
		 * Calculate the maximum number of pages
		 */
		function numPages() {
			var maxentries = Number(objToPaginate.data('maxentries'));
			return Math.ceil(maxentries/opts.items_per_page);
		}
		
		/**
		 * Calculate start and end point of pagination links depending on 
		 * current_page and num_display_entries.
		 * @return {Array}
		 */
		/*
		var ne_half = Math.ceil(opts.num_display_entries/2);
			var np = numPages();
			var upper_limit = np-opts.num_display_entries;
			var start = current_page>ne_half?Math.max(Math.min(current_page-ne_half, upper_limit), 0):0;
			var end = current_page>ne_half?Math.min(current_page+ne_half, np):Math.min(opts.num_display_entries, np);
			return [start,end];
		*/
		
		
		function getInterval()  {
			

			var ne_half = Math.ceil(9);
			var np = numPages();
			
			var upper_limit = np-opts.num_display_entries;
			var start = current_page > ne_half ? Math.max( Math.min( current_page-ne_half, upper_limit), 10):0;
			
			if(start > 10 && start < 20){
				start = 20;
			}else if(start > 20 && start < 30){ start = 30; 
			}else if(start > 30 && start < 40){ start = 40; 
			}else if(start > 40 && start < 50){ start = 50; 
			}else if(start > 50 && start < 60){ start = 60; 
			}else if(start > 60 && start < 70){ start = 70; 
			}else if(start > 70 && start < 80){ start = 80; 
			}else if(start > 80 && start < 90){ start = 90; 
			}else if(start > 90 && start < 100){ start = 100; 
			}else if(start > 100 && start < 110){ start = 110; 
			}else if(start > 110 && start < 120){ start = 120; 
			}else if(start > 120 && start < 130){ start = 130; 
			}else if(start > 130 && start < 140){ start = 140; 
			}else if(start > 140 && start < 150){ start = 150; 
			}else if(start > 150 && start < 160){ start = 160; 
			}else if(start > 160 && start < 170){ start = 170; 
			}else if(start > 170 && start < 180){ start = 180; 
			}else if(start > 180 && start < 190){ start = 190; 
			}else if(start > 190 && start < 200){ start = 200; 
			}else if(start > 200 && start < 210){ start = 210; 
			}
			
			debugger;
			
			var end = current_page > ne_half ? Math.min( current_page + ne_half, np) : Math.min( opts.num_display_entries, np);
			
			if( (end - start) == 10 ){
				
			}else{
				//if( start != 0){
					end = start + 10;
				//}
			}
			
			if(end > np){
				end = np;
			}
			
			return [start,end];
		}
		
		/**
		 * This is the event handling function for the pagination links. 
		 * @param {int} page_id The new page number
		 */
		function pageSelected(page_id, evt){
			current_page = page_id;
			drawLinks();
			var continuePropagation = opts.callback(page_id, panel, opts.items_per_page, objToPaginate);
			if (!continuePropagation) {
				if (evt.stopPropagation) {
					evt.stopPropagation();
				}
				else {
					evt.cancelBubble = true;
				}
			}
			return continuePropagation;
		}
		
		/**
		 * This function inserts the pagination links into the container element
		 */
		function drawLinks() {
			panel.empty();
			var interval = getInterval();
			
			var np = numPages();
			
			// This helper function returns a handler function that calls pageSelected with the right page_id
			var getClickHandler = function(page_id) {
				return function(evt){ return pageSelected(page_id,evt); }
			}
			// Helper function for generating a single link (or a span tag if it's the current page)
			var appendItem = function(page_id, appendopts){
				page_id = page_id<0?0:(page_id<np?page_id:np-1); // Normalize page id to sane value
				appendopts = jQuery.extend({text:page_id+1, classes:""}, appendopts||{});
				if(page_id == current_page){
					var lnk = jQuery("<span class='current linkPager'>"+(appendopts.text)+"</span>");
				}
				else
				{
					var lnk = jQuery("<a class='linkPager'>"+(appendopts.text)+"</a>")
						.bind("click", getClickHandler(page_id))
						.attr('href', opts.link_to.replace(/__id__/,page_id));
						
						
				}
				if(appendopts.classes){lnk.addClass(appendopts.classes);}
				panel.append(lnk);
			}
			// Generate "Previous"-Link
			if(opts.prev_text && (current_page > 0 || opts.prev_show_always)){
				appendItem(current_page-1,{text:opts.prev_text, classes:"prev"});
			}
			// Generate starting points
			//if (interval[0] > 0 && opts.num_edge_entries > 0)
			//{
			//	var end = Math.min(opts.num_edge_entries, interval[0]);
			//	for(var i=0; i<end; i++) {
			//		appendItem(i);
			//	}
			//	if(opts.num_edge_entries < interval[0] && opts.ellipse_text)
			//	{
			//		jQuery("<span>"+opts.ellipse_text+"</span>").appendTo(panel);
			//	}
			//}
			
			if(current_page >= 10 ){
				var elRangeStart = '<a href="#" rel="'+ parseInt(interval[0]-1) +'" class="linkRange">'+ parseInt(interval[0]) + '</a>';
				panel.append(elRangeStart);
			}
			/*}else if(current_page >= 20){
				var elRangeStart = '<a href="#" rel="'+ parseInt(interval[0] - 1 ) +'" class="linkRange">'+ parseInt(interval[0]) + '</a>';
				panel.append(elRangeStart);
			}*/
			
			var iCount = 0;
			
			// Generate interval links
			for(var i=interval[0]; i<interval[1]; i++) {
				appendItem(i);
				iCount++;
			}
			
            if (interval[1] == np) {
				
			}else{
				
				var elRangeEnd = '<a href="#" rel="'+ interval[1] +'" class="linkRange">'+ parseInt(interval[1] + 1) + '</a>';
				panel.append(elRangeEnd);
			}
			
			
			
			
			
			
			
			$('a.linkRange').bind('click',function(e){
				
				var iPage = parseInt($(this).attr('rel'));
				
				pageSelected(iPage,e);
				
				return false;
			});
			
			
			// Generate ending points
			//if (interval[1] < np && opts.num_edge_entries > 0)
			//{
			//	if(np-opts.num_edge_entries > interval[1]&& opts.ellipse_text)
			//	{
			//		jQuery("<span>"+opts.ellipse_text+"</span>").appendTo(panel);
			//	}
			//	var begin = Math.max(np-opts.num_edge_entries, interval[1]);
			//	for(var i=begin; i<np; i++) {
			//		appendItem(i);
			//	}
				
			//}
			//GENERATE PAGE SELECTED AND TOTAL PAGES WHEN OPTIONS ARE 0 - ONLY NEXT AND PREV BUTTON
			if (opts.counterPage > 0){
				var setCurrPage = current_page + 1;
				var spanHtml = '<span class="qp_counter">';
				spanHtml += '<span class="qp_pagenumber">'+ setCurrPage +'</span>';
				spanHtml += opts.qpSeparator;
				spanHtml += '<span class="qp_totalnumber">'+ np +'</span>';
				spanHtml += '</span>';
				panel.append(spanHtml);
			}
			// Generate "Next"-Link
			if(opts.next_text && (current_page < np-1 || opts.next_show_always)){
				appendItem(current_page+1,{text:opts.next_text, classes:"next"});
			}
		}
		
		// Extract current_page from options
		var current_page = opts.current_page;
		
		// Create a sane value for maxentries and items_per_page
		maxentries = (!maxentries || maxentries < 0)?1:maxentries;
		opts.items_per_page = (!opts.items_per_page || opts.items_per_page < 0)?1:opts.items_per_page;
		// Store DOM element for easy access from all inner functions
		var panel = jQuery(this);
		// Attach control functions to the DOM element 
		this.selectPage = function(page_id){ pageSelected(page_id);}
		this.prevPage = function(){ 
			if (current_page > 0) {
				pageSelected(current_page - 1);
				return true;
			}
			else {
				return false;
			}
		}
		this.nextPage = function(){ 
			if(current_page < numPages()-1) {
				pageSelected(current_page+1);
				return true;
			}
			else {
				return false;
			}
		}
		// When all initialisation is done, draw the links
		drawLinks();
        // call callback function
        opts.callback(current_page, this, opts.items_per_page, objToPaginate);
	});
}


/**
 * Callback function that displays the content.
 *
 * Gets called every time the user clicks on a pagination link.
 *
 * @param {int}page_index New Page index
 * @param {jQuery} jq the container with the pagination links as a jQuery object
 */
function pageselectCallback(page_index, jq, items_per_page, objToPaginate){
	
	var num_entries = Number(objToPaginate.data('maxentries'));
    var max_elem = Math.min((page_index+1) * items_per_page, num_entries);
    var newcontent = '';
    
	var start_splice = page_index*items_per_page;
	var end_splice = max_elem;
	
	objToPaginate.children().hide().fadeOut("slow");
	objToPaginate.children().slice(start_splice,end_splice).fadeIn("slow");
			
    return false;
	
}