$.extend({
	lock: function(count, callback) {		
		var count = count;
		return function(e) {if (--count == 0) callback();}
	},
	isIE6: function() {return (($.browser.msie) && ($.browser.version == 6.0));}
});

$.fn.extend({
	ie6TransparentImage: function() {
		return this.each(function() {
			var div = $(document.createElement('div'));
			div.css({
				'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + $(this).attr('src') + "', sizingMethod='crop');",
				'width': $(this).attr('width') + 'px',
				'height': $(this).attr('height') + 'px'
			}).attr('id', $(this).attr('id'));
			$(this).replaceWith(div);
		});
	},
	ie6TransparentBackground: function() {
		return this.each(function() {
        	        var re = /url\("http:\/\/[^\/]*([^"]*)"\)/;
	                m = re.exec($(this).css('background-image'));
	                if (m != null) {
	                        $(this).css({
					'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + m[1] + "', sizingMethod='crop');",
					'backgroundImage': 'none'
				});
	                }
		});
	}
});

var swapper = function() {
	var sw_url = null;
	var sw_stem = '';
	var sw_callback = null;
	var sw_complete = null;
	var data = null;
	var current = 0;
	var sw_links_per_item = 1;

	function init(url, stem, callback, completed_callback, links_per_item) {
		sw_url = url;
		sw_stem = stem;
		sw_callback = callback;
		sw_complete = completed_callback;

		if (links_per_item)
			sw_links_per_item = links_per_item;

		selectLink();

		$('#' + sw_stem).hide();
		$('#panel.' + sw_stem + 's li a').each(updateLink);
		$.getJSON(sw_url, function(d) {
			data = d;
			update();
		});
	}
	function click(e, index) {
		current = Math.floor(index / sw_links_per_item);
		selectLink();

		$('#reg_form').fadeOut('slow');

		if ($('#reg').length > 0) {
			var lk = $.lock(2, update);
			$('#reg').fadeOut('slow', lk);
			$('#' + sw_stem).fadeOut('slow', lk);
		} else {
			$('#' + sw_stem).fadeOut('slow', update);
		}
	}
	function updateLink(index) {
		$(this).attr('href', 'javascript:void(0);')
			.bind('click', function(e) {click(e, index);});
	}
	function selectLink() {
		$('#panel.' + sw_stem + 's li').removeClass('selected');
		$($('#panel.' + sw_stem + 's li')[current]).addClass('selected');
	}
	function update() {
		if (data == null) return;
		var c = sw_callback(data, current);
		$('#' + sw_stem).html(c);

		if (sw_complete) sw_complete();
		else $('#' + sw_stem).fadeIn('slow');
	}
	return {
		init: init
	}
}();

var RegForm = function() {
	var vis = false;

	function set_current(c) {
		$('#reg_form .dev_id').attr('value', c);
	}

	function toggle() {
		if (vis) {
			vis = false;
			$('#reg_form').fadeOut('slow');
		} else {
			vis = true;
			$('#reg_form').fadeIn('slow');
		}
	}

	return {
		toggle: toggle,
		set_current: set_current
	}
}();

$(function(){
	function checkInput(id) {
		var x = $($(id).get(0));
		var y = $(x.closest('div').get(0));
		if (x.val() == '') {
			y.addClass('error');
			return false;
		}
		y.removeClass('error');
		return true;
	}

	function checkForm() {
		var valid = true;
		if ($('#reg_form .dev_id').length == 0) {
			if ($('#register .checkbox input:checked').length == 0) {
				$('#register .checkbox').addClass('error');
				valid = false;
			} else $('#register .checkbox').removeClass('error');
		}
		valid = (checkInput('#name') && valid);
		valid = (checkInput('#email') && valid);

		return valid;
	}

	if ($.isIE6()) $('.filter').ie6TransparentBackground();
	if ($('#content.c_directors').length) {
		swapper.init('assets/data/directors.json', 'director', function(data, current) {
			return	'<div class="name">' + data[current].name + '</div>' +
				'<div class="title">' + data[current].title + '</div>' +
				'<div class="prose">' + data[current].prose + '</div>';
		}, null, 2);
	}
	if ($('#content.c_past').length) {
		swapper.init('assets/data/past_developments.json', 'development', function(data, current) {
			var image_link = data[current].slug.toLowerCase().replace(/ /g, '_');

			return	'<div class="details"><div class="inner">' + 
				'<div class="name">' + data[current].name + '</div>' +
				'<div class="address">' + data[current].address + '</div>' +
				'<div class="prose">' + data[current].prose + '</div>' +
				'</div></div>' +
				'<img src="assets/images/past/' + image_link + '.jpg" />';
		});
	}
	if ($('#content.c_northern').length) {
		swapper.init('assets/data/northern.json', 'development', function(data, current) {
			var image_link = data[current].slug.toLowerCase().replace(/ /g, '_');

			return	'<div class="details"><div class="inner">' + 
				'<div class="name">' + data[current].name + '</div>' +
				'<div class="prose">' + data[current].prose + '</div>' +
				'</div></div>' +
				'<img src="assets/images/northern/' + image_link + '.jpg" />';
		}, function() {
			$('#reg').hide().html('<a href="assets/pdf/Shillington Grove.pdf">View the Shillington Grove brochure</a>');
			$('#development').fadeIn('slow');
			$('#reg').fadeIn('slow');
		});
	}
	if ($('#content.c_london').length) {
		swapper.init('assets/data/london.json', 'development', function(data, current) {
			RegForm.set_current(current);

			var image_link = data[current].slug.toLowerCase().replace(/ /g, '_');

			return	'<div class="details"><div class="inner">' + 
				'<div class="name">' + data[current].name + '</div>' +
				'<div class="prose">' + data[current].prose + '</div>' +
				'</div></div>' +
				'<img src="assets/images/london/' + image_link + '.jpg" />';
		}, function() {
			$('#development').fadeIn('slow');
			$('#reg').hide().fadeIn('slow');
		});

		var a = $(document.createElement('a'));
		a.text('Click here to register interest');
		a.attr('href', 'javascript:void(0);');
		a.bind('click', function(e) {
			RegForm.toggle();
		});
		$('#reg').html(a);

		$('form').bind('submit', checkForm);
	}
	if ($('#content.c_terms').length) {
		$('#terms .inner').jScrollPane();
	}
	if ($('#content.c_home').length) {
		var lh = $('#news .left').height();
		var rh = $('#news .right').height();
		var mh = (lh>rh)?lh:rh;

		$('#newsbg').height(mh + 40);

		$('form').bind('submit', checkForm);
	}
});