var Gallery = {};

  Gallery.images = [];
  Gallery.currentAlbum = '';

  Gallery.users = [];

  Gallery.albumMap = {};
  Gallery.imageMap = {};

  Gallery.getAlbum = function (path) {
  	if (!Gallery.albumMap[path]) {
  		Gallery.albumMap[path] = new Album(path, [], [], OC.basename(path));
  		if (path !== '') {
  			var parent = OC.dirname(path);
  			if (parent === path) {
  				parent = '';
  			}
  			Gallery.getAlbum(parent).subAlbums.push(Gallery.albumMap[path]);
  		}
  	}
  	return Gallery.albumMap[path];

  };
  
  // fill the albums from Gallery.images
  Gallery.fillAlbums = function () {

  	var sortFunction = function (a, b) {
  		return a.path.toLowerCase().localeCompare(b.path.toLowerCase());
  	};

  	var token = $('#gallery').data('token');

  	var album, image;
  	return $.getJSON(OC.filePath('gallery', 'ajax', 'getimages.php'), {token: token}).then(function (data) {

  		Gallery.users = data.users;
  		Gallery.displayNames = data.displayNames;

  		Gallery.images = data.images;

  		for (var i = 0; i < Gallery.images.length; i++) {
  			var parts = Gallery.images[i].split('/');
  			parts.shift();
  			var path = parts.join('/');
  			image = new GalleryImage(Gallery.images[i], path);
  			var dir = OC.dirname(Gallery.images[i]);
  			parts = dir.split('/');
  			parts.shift();
  			dir = parts.join('/');
  			album = Gallery.getAlbum(dir);
  			album.images.push(image);
  			Gallery.imageMap[image.path] = image;

  		}

  
  		for (path in Gallery.albumMap) {
  			Gallery.albumMap[path].images.sort(sortFunction);
  			Gallery.albumMap[path].subAlbums.sort(sortFunction);

  		}

  	});

  };
  
  Gallery.getAlbumInfo = function (album) {
  	if (album === $('#gallery').data('token')) {
  		return [];
  	}
  	if (!Gallery.getAlbumInfo.cache[album]) {
  		var def = new $.Deferred();
  		Gallery.getAlbumInfo.cache[album] = def;
  		$.getJSON(OC.filePath('gallery', 'ajax', 'gallery.php'), {gallery: album}, function (data) {
  			def.resolve(data);
  		});
  	}
  	return Gallery.getAlbumInfo.cache[album];
  };
  Gallery.getAlbumInfo.cache = {};
  Gallery.getImage = function (image) {
  	return OC.filePath('gallery', 'ajax', 'image.php') + '?file=' + encodeURIComponent(image);
  };

  Gallery.share = function (event) {
  	if (!OC.Share.droppedDown) {
  		event.preventDefault();
  		event.stopPropagation();
  
  		(function () {
  			var target = OC.Share.showLink;
  			OC.Share.showLink = function () {
  				var r = target.apply(this, arguments);
  				$('#linkText').val($('#linkText').val().replace('service=files', 'service=gallery'));
  				return r;
  			};
  		})();
  
  		Gallery.getAlbumInfo(Gallery.currentAlbum).then(function (info) {
  			$('a.share').data('item', info.fileid).data('link', true)
  				.data('possible-permissions', info.permissions).
  				click();
  			if (!$('#linkCheckbox').is(':checked')) {
  				$('#linkText').hide();
  			}
  		});
  	}
  };
  Gallery.view = {};
  Gallery.view.element = null;
  Gallery.view.clear = function () {
  	Gallery.view.element.empty();

  	Gallery.showLoading();

  };
  Gallery.view.cache = {};

  
  Gallery.view.viewAlbum = function (albumPath) {

  	var i, crumbs, path;
  	albumPath = albumPath || '';
  	if (!Gallery.albumMap[albumPath]) {
  		return;

  	}

  	Gallery.view.clear();
  	if (albumPath !== Gallery.currentAlbum) {
  		Gallery.view.loadVisibleRows.loading = false;

  	}

  	Gallery.currentAlbum = albumPath;

  	if (albumPath === '' || $('#gallery').data('token')) {

  		$('button.share').hide();
  	} else {
  		$('button.share').show();
  	}
  
  	OC.Breadcrumb.clear();
  	var albumName = $('#content').data('albumname');
  	if (!albumName) {
  		albumName = t('gallery', 'Pictures');
  	}
  	OC.Breadcrumb.push(albumName, '#').click(function () {

  		Gallery.view.viewAlbum('');

  	});

  	path = '';

  	crumbs = albumPath.split('/');

  	for (i = 0; i < crumbs.length; i++) {
  		if (crumbs[i]) {

  			if (path) {
  				path += '/' + crumbs[i];
  			} else {
  				path += crumbs[i];
  			}

  			Gallery.view.pushBreadCrumb(crumbs[i], path);
  		}
  	}

  	Gallery.getAlbumInfo(Gallery.currentAlbum); //preload album info

  
  	Gallery.albumMap[albumPath].viewedItems = 0;
  	setTimeout(function () {
  		Gallery.view.loadVisibleRows.activeIndex = 0;
  		Gallery.view.loadVisibleRows(Gallery.albumMap[Gallery.currentAlbum], Gallery.currentAlbum);
  	}, 0);
  };
  
  Gallery.view.loadVisibleRows = function (album, path) {
  	if (Gallery.view.loadVisibleRows.loading && Gallery.view.loadVisibleRows.loading.state() !== 'resolved') {
  		return Gallery.view.loadVisibleRows.loading;
  	}
  	// load 2 windows worth of rows
  	var scroll = $('#content-wrapper').scrollTop() + $(window).scrollTop();
  	var targetHeight = ($(window).height() * 2) + scroll;
  	var showRows = function (album) {
  		if (!(album.viewedItems < album.subAlbums.length + album.images.length)) {
  			Gallery.view.loadVisibleRows.loading = null;
  			return;
  		}
  		return album.getNextRow(Gallery.view.element.width()).then(function (row) {
  			return row.getDom().then(function (dom) {
  				if (Gallery.currentAlbum !== path) {
  					Gallery.view.loadVisibleRows.loading = null;
  					return; //throw away the row if the user has navigated away in the meantime
  				}
  				if (Gallery.view.element.length == 1) {
  					Gallery.showNormal();
  				}
  				Gallery.view.element.append(dom);
  				if (album.viewedItems < album.subAlbums.length + album.images.length && Gallery.view.element.height() < targetHeight) {
  					return showRows(album);
  				} else {
  					Gallery.view.loadVisibleRows.loading = null;
  				}
  			}, function () {
  				Gallery.view.loadVisibleRows.loading = null;
  			});
  		});
  	};
  	if (Gallery.view.element.height() < targetHeight) {
  		Gallery.view.loadVisibleRows.loading = true;
  		Gallery.view.loadVisibleRows.loading = showRows(album);
  		return Gallery.view.loadVisibleRows.loading;
  	}

  };

  Gallery.view.loadVisibleRows.loading = false;

  
  Gallery.view.pushBreadCrumb = function (text, path) {
  	OC.Breadcrumb.push(text, '#' + path).click(function () {
  		Gallery.view.viewAlbum(path);
  	});
  };

  Gallery.showEmpty = function () {
  	$('#controls').addClass('hidden');
  	$('#emptycontent').removeClass('hidden');
  	$('#loading').addClass('hidden');
  };
  
  Gallery.showLoading = function () {
  	$('#emptycontent').addClass('hidden');
  	$('#controls').removeClass('hidden');
  	$('#loading').removeClass('hidden');
  };
  
  Gallery.showNormal = function () {
  	$('#emptycontent').addClass('hidden');
  	$('#controls').removeClass('hidden');
  	$('#loading').addClass('hidden');

  };
  
  $(document).ready(function () {

  	Gallery.showLoading();
  
  	Gallery.view.element = $('#gallery');

  	Gallery.fillAlbums().then(function () {

  		if(Gallery.images.length === 0) {
  			Gallery.showEmpty();
  		}

  		OC.Breadcrumb.container = $('#breadcrumbs');
  		window.onhashchange();
  		$('button.share').click(Gallery.share);
  	});

  	Gallery.view.element.on('click', 'a.image', function (event) {

  		event.preventDefault();

  		var path = $(this).data('path');
  		var album = Gallery.albumMap[Gallery.currentAlbum];
  		if (location.hash !== encodeURI(path)) {
  			location.hash = encodeURI(path);

  			Thumbnail.paused = true;

  			var images = album.images.map(function (image) {
  				return Gallery.getImage(image.src);
  			});
  			var clickedImage = Gallery.imageMap[path];
  			var i = images.indexOf(Gallery.getImage(clickedImage.src));

  			Slideshow.start(images, i);
  		}
  	});
  
  	$('#openAsFileListButton').click(function (event) {
  		window.location.href = window.location.href.replace('service=gallery', 'service=files');
  	});
  
  	jQuery.fn.slideShow.onstop = function () {
  		$('#content').show();
  		Thumbnail.paused = false;

  		location.hash = encodeURI(Gallery.currentAlbum);

  		Thumbnail.concurrent = 3;
  	};

  
  	$(window).scroll(function () {
  		Gallery.view.loadVisibleRows(Gallery.albumMap[Gallery.currentAlbum], Gallery.currentAlbum);
  	});
  	$('#content-wrapper').scroll(function () {
  		Gallery.view.loadVisibleRows(Gallery.albumMap[Gallery.currentAlbum], Gallery.currentAlbum);
  	});
  
  	$(window).resize(_.throttle(function () {
  		Gallery.view.viewAlbum(Gallery.currentAlbum);
  	}, 500));

  });
  
  window.onhashchange = function () {

  	var album = decodeURI(location.hash).substr(1);
  	if (!Gallery.imageMap[album]) {

  		Slideshow.end();

  		album = decodeURIComponent(album);
  		if (Gallery.currentAlbum !== album || album == '') {
  			Gallery.view.viewAlbum(album);
  		}

  	} else {
  		Gallery.view.viewAlbum(OC.dirname(album));
  		$('#gallery').find('a.image[data-path="' + album + '"]').click();
  	}
  };