/**
 * This jQuery plugin displays pagination links inside the selected elements.
 *
 * @author Gabriel Birke (birke *at* d-scribe *dot* de)
 * @version 1.1
 * @param {int}
 *            maxentries Number of entries to paginate
 * @param {Object}
 *            opts Several options (see README for documentation)
 * @return {Object} jQuery Object
 */
/* this plugin has been heavily modified by Chris Hiester to make a customized
 * "wizard" form for the Thomas Jefferson Universtiy Hospital online appointment request form
 * christopher.hiester@jeffersonhospital.org, 2/6/2009
 */
jQuery.fn.pagination = function(maxentries, opts, position) {
	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 :"...",
		prev_show_always :true,
		next_show_always :true,
		callback : function() {
			return false;
		}
	}, opts || {});

	return this.each( function() {
		/**
		 * Calculate the maximum number of pages
		 */
		function numPages() {
			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}
		 */
		function getInterval() {
			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 ];
		}

		/**
		 * 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);
			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) {
				//alert(opts.caller);
				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 || {});

				// added by Chris Hiester for TJUH Online Appointment Request
				// Form 1/20/2009
				//alert(appendopts.classes + ' | '+ opts.caller);
				//if(appendopts.classes == "prev" || appendopts.classes == "next"){
				if(opts.caller == "#bottom_pagination"){
					appendopts.text == "";
				} else {
				appendopts.text = "Step " + appendopts.text;
				}

				if (page_id == current_page) {
					// var lnk = $("<span
					// class='current'>"+(appendopts.text)+"</span>");

					// Changed for TJUH Appointment Request Form, Chris Hiester,
					// 1/20/2009
						if(appendopts.classes == "prev"){
							if(page_id == 0){
							var lnk = $("<button disabled='disabled' name='back1' class='prev ui-corner-all ui-state-default ui-state-disabled' id='back1'>"+opts.prev_text+"</button>")
							.bind("click", getClickHandler(page_id)).attr('href',
									opts.link_to.replace(/__id__/, page_id));
							} else {
								var lnk = $("<button  name='back1' class='prev ui-corner-all ui-state-default' id='back1'>"+opts.prev_text+"</button>")
								.bind("click", getClickHandler(page_id)).attr('href',
										opts.link_to.replace(/__id__/, page_id));

							}

						} else if (appendopts.classes == "next") {
						var lnk = $("<button name='next1' class='next ui-state-default ui-corner-all ui-priority-primary' id='next1' >"+opts.next_text+"</button><input class='submitform' id='submitform' name='submitform ui-state-default ui-corner-all ui-priority-primary' type='submit' value='Submit Form'/>")
						.bind("click", getClickHandler(page_id)).attr('href',
								opts.link_to.replace(/__id__/, page_id));
						} else {
							if(opts.caller == "#bottom_pagination"){
								var lnk = null;
							} else {

								 if(page_id == 2){

									var lnk = $("<li id='link"+page_id+"'><a class='current thirdstep' href='javascript:void(0)'>" + (appendopts.text) + "</a></li>")
									.bind("click", getClickHandler(page_id)).attr('href',
									opts.link_to.replace(/__id__/, page_id));
									$('.prev').removeClass('ui-state-disabled');
									$('.prev').removeAttr('disabled');
									$('.prev').addClass('ui-priority-secondary');
									if(current_page == 2){
										$('.secondstep').addClass("follower");
										$('.firststep').addClass("notfollower");
										}
								} else if(page_id ==1){

									var lnk = $("<li id='link"+page_id+"'><a class='current' href='javascript:void(0)'>" + (appendopts.text) + "</a></li>")
									.bind("click", getClickHandler(page_id)).attr('href',
									opts.link_to.replace(/__id__/, page_id));
									$('.prev').removeClass('ui-state-disabled');
									$('.prev').removeAttr('disabled');
									$('.prev').addClass('ui-priority-secondary');
								} else {

									var lnk = $("<li id='link"+page_id+"'><a class='current' href='javascript:void(0)'>" + (appendopts.text) + "</a></li>")
									.bind("click", getClickHandler(page_id)).attr('href',
									opts.link_to.replace(/__id__/, page_id));
									$('.prev').addClass('ui-state-disabled');
									$('.prev').attr('disabled','disabled');
									$('.prev').removeClass('ui-priority-secondary');

								}

							}

						}



				} else {

					// var lnk = $("<a>"+(appendopts.text)+"</a>")

					// Changed for TJUH Appointment Request Form, Chris Hiester,
					// 1/20/2009



					if(appendopts.classes == "prev"){
							if(page_id == 1){
								var lnk = $("<button disabled='disabled' name='back2' class='prev ui-state-disabled ui-state-default ui-corner-all ui-priority-secondary' id='back2'>"+opts.prev_text+"</button>")
								.bind("click", getClickHandler(page_id)).attr('href',
									opts.link_to.replace(/__id__/, page_id));
							} else {
							var lnk = $("<button name='back2' class='prev ui-state-default ui-corner-all ui-priority-secondary' id='back2'>"+opts.prev_text+"</button>")
							.bind("click", getClickHandler(page_id)).attr('href',
								opts.link_to.replace(/__id__/, page_id));
							}

					} else if (appendopts.classes == "next") {

						var lnk = $("<button name='next2' class='next ui-state-default ui-corner-all ui-priority-primary' id='next2'>"+opts.next_text+"</button><input class='submitform' id='submitform ui-state-default ui-corner-all ui-priority-primary' name='submitform' type='submit' value='Submit Form'/>")
						.bind("click", getClickHandler(page_id)).attr('href',
						opts.link_to.replace(/__id__/, page_id));
					} else {
						if(opts.caller == "#bottom_pagination"){
						var lnk = null;

						}else {
							if(page_id == 2){
							var lnk = $("<li id='link"+page_id+"'><a class='thirdstep notcurrent'>" + (appendopts.text) + "</a></li>")
							.bind("click", getClickHandler(page_id)).attr('href',
							opts.link_to.replace(/__id__/, page_id));
							}else if(page_id == 1) {

								var lnk = $("<li id='link"+page_id+"'><a class='secondstep notcurrent'>" + (appendopts.text) + "</a></li>")
								.bind("click", getClickHandler(page_id)).attr('href',
								opts.link_to.replace(/__id__/, page_id));
							} else {
								var lnk = $("<li id='link"+page_id+"'><a class='firststep notcurrent'>" + (appendopts.text) + "</a></li>")
								.bind("click", getClickHandler(page_id)).attr('href',
								opts.link_to.replace(/__id__/, page_id));

							}
							if(current_page == 0 ){
								$('.secondstep').addClass("notfollower");
								}
						}

					}
				}
				if (appendopts.classes) {
					if(lnk) {
					//lnk.addClass(appendopts.classes);
					}
				}
				panel.append(lnk);
			} /* end appendItem function */

			// 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);
				}
			}
			// Generate interval links
			for ( var i = interval[0]; i < interval[1]; i++) {
				appendItem(i);
			}
			// 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 "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();
	});
}