function setCookie(name, value, exdays)
{
	var exdate = new Date();
	exdate.setDate(exdate.getDate() + exdays);
	value = escape(value) + '; path=/' + ((exdays == null) ? '' : '; expires=' + exdate.toUTCString());
	document.cookie = name + '=' + value;
}

function getCookie(name)
{
	var value = document.cookie;
	var start = value.indexOf(' ' + name + '=');

	if (start == -1)
		start = value.indexOf(name + '=');

	if (start == -1)
		return null;

	start = value.indexOf('=', start) + 1;
	var end = value.indexOf(';', start);
	if (end == -1)
		end = value.length;

	return unescape(value.substring(start, end));
}

function rememberLastSearchQuery()
{
	//lastSearchQuery variable is obtained from layout
	setCookie('last-search-query', lastSearchQuery);
}

//core functionalities, prototypes
function getJSON(data)
{
	if (typeof(data.headers) === 'undefined')
		data.headers = {};
	data.headers['X-Ajax'] = '1';
	data.type = 'GET';
	return $.ajax(data);
};

function postJSON(data)
{
	if (typeof(data.headers) === 'undefined')
		data.headers = {};
	data.headers['X-Ajax'] = '1';
	data.type = 'POST';
	return $.ajax(data);
};

$.fn.hasAttr = function(name)
{
	return this.attr(name) !== undefined;
};

$.fn.bindOnce = function(name, eventName, callback)
{
	$.each(this, function(i, item)
	{
		if ($(item).data(name) == name)
			return;
		$(item).data(name, name);
		$(item).on(eventName, callback);
	});
};



//basic event listeners
$(function()
{
	$('body').bind('dom-update', function()
	{
		//event confirmations
		function confirmEvent(e)
		{
			if (!confirm($(this).attr('data-confirm-text')))
			{
				e.preventDefault();
				e.stopPropagation();
				e.stopImmediatePropagation();
			}
		}

		$('form.confirmable').bindOnce('confirmation', 'submit', confirmEvent);
		$('a.confirmable').bindOnce('confirmation', 'click', confirmEvent);


		//simple action buttons
		$('a.simple-action').bindOnce('simple-action', 'click', function(e)
		{
			if (e.isPropagationStopped())
				return;

			e.preventDefault();
			rememberLastSearchQuery();

			var aDom = $(this);
			if (aDom.hasClass('inactive'))
				return;
			aDom.addClass('inactive');

			var url = $(this).attr('href');
			postJSON({ url: url }).success(function(data)
			{
				if (aDom.hasAttr('data-redirect-url'))
					window.location.href = aDom.attr('data-redirect-url');
				else if (aDom.data('callback'))
					aDom.data('callback')();
				else
					window.location.reload();
			}).error(function(xhr)
			{
				alert(xhr.responseJSON
					? xhr.responseJSON.message
					: 'Fatal error');
				aDom.removeClass('inactive');
			});
		});


		//simple action forms
		$('form.simple-action').bindOnce('simple-action', 'submit', function(e)
		{
			e.preventDefault();
			rememberLastSearchQuery();

			var formDom = $(this);
			if (formDom.hasClass('inactive'))
				return;
			formDom.addClass('inactive');
			formDom.find(':input').attr('readonly', true);

			var url = formDom.attr('action');
			var fd = new FormData(formDom[0]);

			var ajaxData =
			{
				url: url,
				data: fd,
				processData: false,
				contentType: false,
			};

			postJSON(ajaxData)
				.success(function(data)
				{
					if (data.message)
						alert(data.message);
					console.log(data);
					disableExitConfirmation();
					formDom.find(':input').attr('readonly', false);
					formDom.removeClass('inactive');
					if (data.redirectUrl)
						window.location.href = data.redirectUrl;
					else
						window.location.reload();
				})
				.error(function(xhr)
				{
					alert(xhr.responseJSON
						? xhr.responseJSON.message
						: 'Fatal error');
					formDom.find(':input').attr('readonly', false);
					formDom.removeClass('inactive');
				});
		});


		//attach data from submit buttons to forms before .submit() gets called
		$('.submit').each(function()
		{
			$(this).bindOnce('submit-faux-input', 'click', function()
			{
				var form = $(this).closest('form');
				form.find('.faux-submit').remove();
				var input = $('<input class="faux-submit" type="hidden"/>').attr({
					name: $(this).attr('name'),
					value: $(this).val()
				});
				form.append(input);
			});
		});
	});


	//try to remember last search query
	window.onbeforeunload = rememberLastSearchQuery;
});



//modify DOM on small viewports
function processSidebar()
{
	if ($('#small-screen').is(':visible'))
		$('#sidebar').insertAfter($('#inner-content'));
	else
		$('#sidebar').insertBefore($('#inner-content'));
}
$(function()
{
	$(window).resize(function()
	{
		fixSize();
		if ($('body').width() == $('body').data('last-width'))
			return;
		$('body').data('last-width', $('body').width());
		$('body').trigger('dom-update');
	});
	$('body').bind('dom-update', processSidebar);
	fixSize();
});

var fixedEvenOnce = false;
function fixSize()
{
	if ($('#small-screen').is(':visible'))
		return;
	var multiply = 168;
	var oldWidth = $('.main-wrapper:eq(0)').width();
	$('.main-wrapper:eq(0)').width('');
	var newWidth = $('.main-wrapper:eq(0)').width();
	if (oldWidth != newWidth || !fixedEvenOnce)
	{
		$('.main-wrapper').width(multiply * Math.floor(newWidth / multiply));
		fixedEvenOnce = true;
	}
}



//autocomplete
function split(val)
{
    return val.split(/\s+/);
}

function retrieveTags(searchTerm, cb)
{
	var options =
	{
		url: '/tags-autocomplete',
		data: { search: searchTerm }
	};
	getJSON(options)
		.success(function(data)
		{
			var tags = $.map(data.tags.slice(0, 15), function(tag)
			{
				var ret =
				{
					label: tag.name + ' (' + tag.count + ')',
					value: tag.name,
				};
				return ret;
			});

			cb(tags);
		});
}

$(function()
{
	$('.autocomplete').each(function()
	{
		var options =
		{
			minLength: 1,
			source: function(request, response)
			{
				var terms = split(request.term);
				var term = terms.pop();
				if (term != '')
					retrieveTags(term, response);
			},
			focus: function(e)
			{
				// prevent value inserted on focus
				e.preventDefault();
			},
			select: function(e, ui)
			{
				e.preventDefault();
				var terms = split(this.value);
				terms.pop();
				terms.push(ui.item.value);
				terms.push('');
				this.value = terms.join(' ');
			}
		};

		if ($(this).parents('#top-nav').length != 0)
		{
			options['position'] =
			{
				my: 'right top',
				at: 'right bottom'
			};
		}

		var searchInput = $(this);
		searchInput
		// don't navigate away from the field on tab when selecting an item
		.bind('keydown', function(e)
		{
			if (e.keyCode === $.ui.keyCode.TAB && $(this).data('autocomplete').menu.active)
				e.preventDefault();
		}).autocomplete(options);
	});
});

function attachTagIt(target)
{
	var tagItOptions =
	{
		caseSensitive: false,
		onTagClicked: function(e, ui)
		{
			var targetTagit = ui.tag.parents('.tagit');
			var context = target.tagit('assignedTags');
			var options =
			{
				url: '/tags-related',
				data:
				{
					context: context,
					tag: ui.tagLabel
				}
			};

			if (targetTagit.siblings('.related-tags:eq(0)').data('for') == options.data.tag)
			{
				targetTagit.siblings('.related-tags').slideUp(function()
				{
					$(this).remove();
				});
				return;
			}

			getJSON(options).success(function(data)
			{
				var list = $('<ul>');
				$.each(data.tags, function(i, tag)
				{
					var link = $('<a>');
					link.attr('href', tag['search-link']);
					link.text('#' + tag.name);
					link.click(function(e)
					{
						e.preventDefault();
						target.tagit('createTag', tag.name);
					});
					list.append(link.wrap('<li/>').parent());
				});
				targetTagit.siblings('.related-tags').slideUp(function()
				{
					$(this).remove();
				});
				var div = $('<div>');
				div.data('for', options.tag);
				div.addClass('related-tags');
				div.append('<p>Related tags:</p>');
				div.append(list);
				div.append('<div class="clear"></div>');
				div.insertAfter(targetTagit).hide().slideDown();
			});
		},

		autocomplete:
		{
			source:
				function(request, response)
				{
					var tagit = this;
					//var context = tagit.element.tagit('assignedTags');
					retrieveTags(request.term.toLowerCase(), function(tags)
					{
						if (!tagit.options.allowDuplicates)
						{
							tags = $.grep(tags, function(tag)
							{
								return tagit.assignedTags().indexOf(tag.value) == -1;
							});
						}
						response(tags);
					});
				},
		}
	};

	tagItOptions.placeholderText = target.attr('placeholder');
	target.tagit(tagItOptions);
}



//prevent keybindings from executing when flash posts are focused
var oldMousetrapBind = Mousetrap.bind;
Mousetrap.bind = function(key, func, args)
{
	oldMousetrapBind(key, function()
	{
		if ($(document.activeElement).parents('.post-type-flash').length > 0)
			return false;

		func();
	}, args);
};



//hotkeys
$(function()
{
	Mousetrap.bind('q', function()
		{
			$('#top-nav input').focus();
			return false;
		}, 'keyup');

	Mousetrap.bind('w', function()
		{
			$('body,html').animate({scrollTop: '-=150px'}, 200);
		});

	Mousetrap.bind('s', function()
		{
			$('body,html').animate({scrollTop: '+=150px'}, 200);
		});

	Mousetrap.bind('a', function()
		{
			var url = $('.paginator:visible .prev:not(.disabled) a').attr('href');
			if (typeof url !== 'undefined')
				window.location.href = url;
		}, 'keyup');

	Mousetrap.bind('d', function()
		{
			var url = $('.paginator:visible .next:not(.disabled) a').attr('href');
			if (typeof url !== 'undefined')
				window.location.href = url;
		}, 'keyup');

	Mousetrap.bind('p', function()
		{
			$('.post a').eq(0).focus();
			return false;
		}, 'keyup');
});



function enableExitConfirmation()
{
	$(window).bind('beforeunload', function(e)
	{
		return 'There are unsaved changes.';
	});
}

function disableExitConfirmation()
{
	$(window).unbind('beforeunload');
}