$(document).ready(function() {
	function cachePath(path) {
		if (path == "")
			return "root";
		if (path[0] == '/')
			path = path.substring(1);
		path = path
			.replace(/ /g, "_")
			.replace(/\//g, "-")
			.replace(/\(/g, "")
			.replace(/\)/g, "")
			.replace(/#/g, "")
			.replace(/&/g, "")
			.replace(/,/g, "")
			.replace(/\[/g, "")
			.replace(/\]/g, "")
			.replace(/"/g, "")
			.replace(/'/g, "")
			.replace(/_-_/g, "-")
			.toLowerCase();
		while (path.indexOf("--") != -1)
			path = path.replace(/--/g, "-");
		while (path.indexOf("__") != -1)
			path = path.replace(/__/g, "_");
		return path;
	}
	function imagePath(image, path, size, square) {
		var suffix;
		if (square)
			suffix = size.toString() + "s";
		else
			suffix = size.toString();
		return "cache/" + cachePath(path + "/" + image + "_" + suffix + ".jpg");
	}
	function properId(path) {
		if (!path[0].match(/[a-zA-Z]/))
			path = "a" + path;
		return path.replace(/[^a-zA-Z0-9_:.\-]/g, "-");
	}
	function escapeId(id) {
		return id.replace(/\./g, "\\.").replace(/,/g, "\\,");
	}
	function loadAlbum() {
		if (current_album_cache in album_cache) {
			albumLoaded(album_cache[current_album_cache]);
			return;
		}
		$("#loading").show();
		$.ajax({
			type: "GET",
			dataType: "json",
			url: "cache/" + current_album_cache + ".json",
			error: die,
			success: albumLoaded
		});
	}
	function albumLoaded(album) {
		var albumCachePath = cachePath(album.path);
		album_cache[albumCachePath] = album;
		if (albumCachePath != current_album_cache)
			return;
		undie();
		$("#loading").hide();
		current_album = album;
		if (current_photo_cache != null)
			showPhoto();
		showAlbum(true);
		setTitle();
	}
	function trimExtension(title) {
		var index = title.lastIndexOf(".");
		if (index != -1)
			return title.substring(0, index)
		return title;
	}
	function setTitle() {
		var title = "";
		var documentTitle = "";
		var components;
		if (current_album.path.length == 0)
			components = [original_title];
		else {
			components = current_album.path.split("/");
			components.unshift(original_title);
		}
		if (current_photo_cache != null)
			documentTitle += trimExtension(current_photo.name);
		var last = "";
		for (var i = 0; i < components.length; ++i) {
			if (i || current_photo_cache != null)
				documentTitle += " \u00ab ";
			if (i)
				last += "/" + components[i];
			if (i < components.length - 1 || current_photo_cache != null)
				title += "<a href=\"#!/" + (i == 0 ? "" : cachePath(last.substring(1))) + "\">";
			title += components[i];
			documentTitle += components[components.length - 1 - i];
			if (i < components.length - 1 || current_photo_cache != null) {
				title += "</a>";
				title += " &raquo; ";
			}
		}
		if (current_photo_cache != null)
			title += trimExtension(current_photo.name);
		$("#title").html(title);
		document.title = documentTitle;
	}
	function showAlbum(populate) {
		if (current_photo_cache == null && previous_photo_cache == null)
			$("html, body").stop().animate({ scrollTop: 0 }, "slow");
		
		if (populate) {
			var photos = "";
			for (var i = 0; i < current_album.photos.length; ++i)
				photos += "<a href=\"#!/" + current_album_cache + "/" + cachePath(current_album.photos[i].name) + "\"><img title=\"" + trimExtension(current_album.photos[i].name) + "\" alt=\"" + trimExtension(current_album.photos[i].name) + "\" id=\"thumb-" + cachePath(current_album.photos[i].name) + "\" src=\"" + imagePath(current_album.photos[i].name, current_album.path, 150, true) + "\" height=\"150\" width=\"150\"></a>";
			$("#thumbs").html(photos);
			
			var subalbums = "";
			var thumbFinderList = new Array();
			for (var i = current_album.albums.length - 1; i >= 0; --i) {
				var path = cachePath(current_album.path + "/" + current_album.albums[i].path);
				var id = properId("album-" + path);
				subalbums += "<a href=\"#!/" + path + "\"><div title=\"" + current_album.albums[i].date + "\" id=\"" + id + "\" class=\"album-button\">" + current_album.albums[i].path + "</div></a>";
				thumbFinderList.push({ path: path, id: escapeId(id) });
			}
			$("#subalbums").html(subalbums);
			for (var i = 0; i < thumbFinderList.length; ++i)
				(function(thumb) {
					albumThumbFinder(thumb.path, function(photo, album) {
						$("#" + thumb.id).css("background-image", "url(" + imagePath(photo.name, album.path, 150, true) + ")");
					});
				})(thumbFinderList[i]);
		}
		
		if (current_photo_cache == null) {
			$("#thumbs img").removeClass("current-thumb");
			$("#album-view").removeClass("photo-view-container");
			$("#subalbums").show();
			$("#photo-view").hide();
		}
		setTimeout(scrollToThumb, 1);
	}
	function getDecimal(fraction) {
		if (fraction[0] < fraction[1])
			return fraction[0] + "/" + fraction[1];
		return (fraction[0] / fraction[1]).toString();
	}
	function scaleImage() {
		var image = $("#photo");
		if (image.get(0) == this)
			$(window).bind("resize", scaleImage);
		var container = $("#photo-view");
		if (image.css("width") != "100%" && container.height() * image.width() / image.height() > container.width())
			image.css("width", "100%").css("height", "auto");
		else if (image.css("height") != "100%")
			image.css("height", "100%").css("width", "auto");
	}
	function showPhoto() {
		currentPhoto();
		if (current_photo == null) {
			die();
			return;
		}
		undie();
		var maxSize = 800;
		var width = current_photo.size[0];
		var height = current_photo.size[1];
		if (width > height) {
			height = height / width * maxSize;
			width = maxSize;
		} else {
			width = width / height * maxSize;
			height = maxSize;
		}
		$(window).unbind("resize", scaleImage);
		$("#photo")
			.attr("width", width).attr("height", height)
			.attr("src", imagePath(current_photo.name, current_album.path, maxSize, false))
			.attr("alt", current_photo.name)
			.attr("title", current_photo.date)
			.load(scaleImage);
		
		var previousPhoto = current_album.photos[
			(current_photo_index - 1 < 0) ? (current_album.photos.length - 1) : (current_photo_index - 1)
		];
		var nextPhoto = current_album.photos[
			(current_photo_index + 1 >= current_album.photos.length) ? 0 : (current_photo_index + 1)
		];
		$.preloadImages(imagePath(nextPhoto.name, current_album.path, maxSize, false), imagePath(previousPhoto.name, current_album.path, maxSize, false));
		
		var nextLink = "#!/" + current_album_cache + "/" + cachePath(nextPhoto.name);
		$("#next-photo").attr("href", nextLink);
		$("#next").attr("href", nextLink);
		$("#back").attr("href", "#!/" + current_album_cache + "/" + cachePath(previousPhoto.name));
		$("#original-link").attr("target", "_blank").attr("href", "albums/" + current_album.path + "/" + current_photo.name);

		var text = "<table>";
		if (current_photo.make != undefined) text += "<tr><td>Camera Maker</td><td>" + current_photo.make + "</td></tr>";
		if (current_photo.model != undefined) text += "<tr><td>Camera Model</td><td>" + current_photo.model + "</td></tr>";
		if (current_photo.date != undefined) text += "<tr><td>Time Taken</td><td>" + current_photo.date + "</td></tr>";
		if (current_photo.size != undefined) text += "<tr><td>Resolution</td><td>" + current_photo.size[0] + " x " + current_photo.size[1] + "</td></tr>";
		if (current_photo.aperture != undefined) text += "<tr><td>Aperture</td><td> f/" + getDecimal(current_photo.aperture) + "</td></tr>";
		if (current_photo.focalLength != undefined) text += "<tr><td>Focal Length</td><td>" + getDecimal(current_photo.focalLength) + " mm</td></tr>";
		if (current_photo.iso != undefined) text += "<tr><td>ISO</td><td>" + current_photo.iso + "</td></tr>";
		if (current_photo.exposureTime != undefined) text += "<tr><td>Exposure Time</td><td>" + getDecimal(current_photo.exposureTime) + " sec</td></tr>";
		if (current_photo.exposureProgram != undefined) text += "<tr><td>Exposure Program</td><td>" + current_photo.exposureProgram + "</td></tr>";
		if (current_photo.exposureCompensation != undefined) text += "<tr><td>Exposure Compensation</td><td>" + getDecimal(current_photo.exposureCompensation) + "</td></tr>";
		if (current_photo.spectralSensitivity != undefined) text += "<tr><td>Spectral Sensitivity</td><td>" + current_photo.spectralSensitivity + "</td></tr>";
		if (current_photo.flash != undefined) text += "<tr><td>Flash</td><td>" + current_photo.flash + "</td></tr>";
		if (current_photo.orientation != undefined) text += "<tr><td>Orientation</td><td>" + current_photo.orientation + "</td></tr>";
		text += "</table>";
		$("#metadata").html(text);
		
		$("#album-view").addClass("photo-view-container");
		$("#subalbums").hide();
		$("#photo-view").show();
	}
	function scrollToThumb() {
		var photo = current_photo_cache
		if (photo == null) {
			photo = previous_photo_cache;
			if (photo == null)
				return;
		}
		var thumb = $("#thumb-" + escapeId(properId(photo)));
		if (!thumb.length)
			return;
		if (current_photo_cache != null) {
			var scroller = $("#album-view");
			scroller.stop().animate({ scrollLeft: thumb.position().left + scroller.scrollLeft() - scroller.width() / 2 + thumb.width() / 2 }, "slow");
		} else
			$("html, body").stop().animate({ scrollTop: thumb.offset().top - $(window).height() / 2 + thumb.height() }, "slow");
		
		if (current_photo_cache != null) {
			$("#thumbs img").removeClass("current-thumb");
			thumb.addClass("current-thumb");
		}
	}
	function currentPhoto() {
		for (current_photo_index = 0; current_photo_index < current_album.photos.length; ++current_photo_index) {
			if (cachePath(current_album.photos[current_photo_index].name) == current_photo_cache)
				break;
		}
		if (current_photo_index >= current_album.photos.length) {
			current_photo = null;
			current_photo_index = -1;
			return;
		}
		current_photo = current_album.photos[current_photo_index];
	}
	
	function albumForThumbIteration(album, callback) {
		album_cache[cachePath(album.path)] = album;
		var index = Math.floor(Math.random() * (album.photos.length + album.albums.length));
		if (index >= album.photos.length) {
			index -= album.photos.length;
			fetchAlbumForThumb(cachePath(album.path + "/" + album.albums[index].path), function(fetchedAlbum) {
				albumForThumbIteration(fetchedAlbum, callback);
			});
		} else
			callback(album.photos[index], album);
	}
	function fetchAlbumForThumb(album, callback) {
		if (album in album_cache) {
			callback(album_cache[album]);
			return;
		}
		$.ajax({
			type: "GET",
			dataType: "json",
			url: "cache/" + album + ".json",
			success: callback
		});
	}
	function albumThumbFinder(album, callback) {
		fetchAlbumForThumb(album, function(fetchedAlbum) { albumForThumbIteration(fetchedAlbum, callback); });
	}

	function die() {
		$("#error-overlay").fadeTo(500, 0.8);
		$("#error-text").fadeIn(2500);
		$("body, html").css("overflow", "hidden");
	}
	function undie() {
		$("#error-text, #error-overlay").fadeOut(500);
		$("body, html").css("overflow", "auto");
	}
	window.hashUrl = function() {
		var new_album_cache = location.hash.substring(1);
		if (new_album_cache.length) {
			if (new_album_cache[0] == "!")
				new_album_cache = new_album_cache.substring(1);
			if (new_album_cache[0] == "/")
				new_album_cache = new_album_cache.substring(1);
			if (new_album_cache[new_album_cache.length - 1] == "/")
				new_album_cache = new_album_cache.substring(0, new_album_cache.length - 1);
		}
		return new_album_cache;
	}
	
	var current_album_cache = null;
	var current_photo_cache = null;
	var previous_photo_cache = null;
	var current_album = null;
	var current_photo = null;
	var current_photo_index = -1;
	var original_title = document.title;
	var album_cache = new Array();
	$(window).hashchange(function() {
		var new_album_cache = window.hashUrl();
		var index = new_album_cache.lastIndexOf("/");
		if (index != -1 && index != new_album_cache.length - 1) {
			previous_photo_cache = current_photo_cache;
			current_photo_cache = new_album_cache.substring(index + 1);
			new_album_cache = new_album_cache.substring(0, index);
		} else {
			previous_photo_cache = current_photo_cache;
			current_photo_cache = null;
		}
		if (!new_album_cache.length)
			new_album_cache = cachePath("root");
		if (new_album_cache != current_album_cache) {
			current_album_cache = new_album_cache;
			previous_photo_cache = null;
			loadAlbum();
		} else if (current_photo_cache != null) {
			showPhoto();
			showAlbum(false);
			setTitle();
		} else {
			showAlbum(false);
			setTitle();
		}
	});
	$(window).hashchange();
	$(document).keydown(function(e){
		if (current_photo_cache == null)
			return true;
		if (e.keyCode == 39) {
			window.location.href = $("#next").attr("href");
			return false;
		} else if (e.keyCode == 37) {
			window.location.href = $("#back").attr("href");
			return false;
		}
		return true;
	});
	$("#photo-box").mouseenter(function() {
		$("#photo-links").stop().fadeTo("slow", 0.50).css("display", "inline");
	});
	$("#photo-box").mouseleave(function() {
		$("#photo-links").stop().fadeOut("slow");
	});
	$("#next, #back").mouseenter(function() {
		$(this).fadeTo("slow", 1);
	});
	$("#next, #back").mouseleave(function() {
		$(this).fadeTo("slow", 0.35);
	});
	$("#metadata-link").click(function() {
		if (!$("#metadata").is(":visible"))
			$("#metadata").stop()
				.css("height", 0)
				.css("padding-top", 0)
				.css("padding-bottom", 0)
				.show()
				.animate({ height: $("#metadata > table").height(), paddingTop: 3, paddingBottom: 3 }, "slow", function() {
					$(this).css("height", "auto");
					$("#metadata-link").text($("#metadata-link").text().replace("show", "hide"));
				});
		else
			$("#metadata").stop().animate({ height: 0, paddingTop: 0, paddingBottom: 0 }, "slow", function() {
				$(this).hide();
				$("#metadata-link").text($("#metadata-link").text().replace("hide", "show"));
			});
	});
});