(function (window, $, H5AI, config) {

	H5AI.core = (function () {

		var $window = $(window),
			defaults = {
				store: {
					viewmode: "h5ai.pref.viewmode",
					lang: "h5ai.pref.lang"
				},
				callbacks: {
					pathClick: []
				},

				rootAbsHref: "/",
				h5aiAbsHref: "/_h5ai/",
				customHeader: null,
				customFooter: null,
				viewmodes: ["details", "icons"],
				sortorder: "na",
				showTree: true,
				slideTree: true,
				folderStatus: {},
				lang: "en",
				useBrowserLang: true,
				setParentFolderLabels: true,
				linkHoverStates: true,
				dateFormat: "yyyy-MM-dd HH:mm",
				showThumbs: false,
				thumbTypes: ["bmp", "gif", "ico", "image", "jpg", "png", "tiff"],
				zippedDownload: false,
				qrCodesSize: null,
				showFilter: false
			},
			settings = $.extend({}, defaults, config.options),
			currentDateFormat = settings.dateFormat,
			extToFileType = (function (types) {
				var map = {};
				$.each(types, function (type, exts) {
					$.each(exts, function (idx, ext) {
						map[ext] = type;
					});
				});
				return map;
			}(config.types)),
			api = function () {

				return settings.h5aiAbsHref + "php/api.php";
			},
			image = function (id, noPngExt) {

				return settings.h5aiAbsHref + "images/" + id + (noPngExt ? "" : ".png");
			},
			icon = function (id, big) {

				return settings.h5aiAbsHref + "icons/" + (big ? "48x48" : "16x16") + "/" + id + ".png";
			},
			viewmode = function (viewmode) {

				var $viewDetails = $("#viewdetails"),
					$viewIcons = $("#viewicons"),
					$extended = $("#extended");

				if (viewmode) {
					amplify.store(settings.store.viewmode, viewmode);
				} else {
					viewmode = amplify.store(settings.store.viewmode);
				}
				viewmode = $.inArray(viewmode, settings.viewmodes) >= 0 ? viewmode : settings.viewmodes[0];

				$viewDetails.add($viewIcons).removeClass("current");
				if (viewmode === "details") {
					$viewDetails.addClass("current");
					$extended.addClass("details-view").removeClass("icons-view").show();
				} else if (viewmode === "icons") {
					$viewIcons.addClass("current");
					$extended.removeClass("details-view").addClass("icons-view").show();
				} else {
					$extended.hide();
				}
			},
			initTopSpace = function () {

				var $body = $("body"),
					$tree = $("#tree"),
					adjustTopSpace = function () {

						var winHeight = $window.height(),
							navHeight = $("body > nav").outerHeight(),
							footerHeight = $("body > footer").outerHeight(),
							contentSpacing = 50,
							treeSpacing = 30;

						$body.css({
							"margin-top": navHeight + contentSpacing,
							"margin-bottom": footerHeight + contentSpacing
						});

						$tree.css({
							top: navHeight + treeSpacing,
							height: winHeight - navHeight - footerHeight - 18 - 2 * treeSpacing
						});

						try {
							$tree.get(0).updateScrollbar();
						} catch (err) {}
					};

				$window.resize(function () {
					adjustTopSpace();
				});
				adjustTopSpace();
			},
			initViews = function () {

				var $navbar = $("#navbar"),
					$extended = $("#extended");

				$("#table").remove();

				if (settings.viewmodes.length > 1) {
					if ($.inArray("icons", settings.viewmodes) >= 0) {
						$("<li id='viewicons' class='view'><a href='#'><img alt='view-icons' /><span class='l10n-icons'>icons</span></a></li>")
							.find("img").attr("src", image("view-icons")).end()
							.click(function () { viewmode("icons"); })
							.appendTo($navbar);
					}
					if ($.inArray("details", settings.viewmodes) >= 0) {
						$("<li id='viewdetails' class='view'><a href='#'><img alt='view-details' /><span class='l10n-details'>details</span></a></li>")
							.find("img").attr("src", image("view-details")).end()
							.click(function () { viewmode("details"); })
							.appendTo($navbar);
					}
				}

				// status update
				$extended.find(".entry a").hover(
					function () {
						if ($extended.hasClass("icons-view")) {
							var $this = $(this);
							$(".status.default").hide();
							$(".status.dynamic")
								.empty()
								.append($this.find(".label").clone())
								.append($("<span class='sep'>·</span>"))
								.append($this.find(".date").clone())
								.show();

							if (!$this.closest(".entry").hasClass("folder")) {
								$(".status.dynamic")
									.append($("<span class='sep'>·</span>"))
									.append($this.find(".size").clone());
							}
						}
					},
					function () {
						$(".status.default").show();
						$(".status.dynamic").empty().hide();
					}
				);
			},
			shiftTree = function (forceVisible, dontAnimate) {

				var $tree = $("#tree"),
					$extended = $("#extended");

				if ((settings.slideTree && $tree.outerWidth() < $extended.offset().left) || forceVisible) {
					if (dontAnimate) {
						$tree.stop().css({ left: 0 });
					} else {
						$tree.stop().animate({ left: 0 });
					}
				} else {
					if (dontAnimate) {
						$tree.stop().css({ left: 18 - $tree.outerWidth() });
					} else {
						$tree.stop().animate({ left: 18 - $tree.outerWidth() });
					}
				}
			},
			initTree = function () {

				$("#tree").hover(
					function () { shiftTree(true); },
					function () { shiftTree(); }
				);
				$window.resize(function () { shiftTree(); });
				shiftTree(false, true);
			},
			selectLinks = function (href) {

				var elements = [];
				$("a[href^='/']").each(function () {

					if ($(this).attr("href") === href) {
						elements.push(this);
					}
				});
				return $(elements);
			},
			linkHoverStates = function () {

				if (settings.linkHoverStates) {
					$("a[href^='/']:not(.linkedHoverStates)").each(function () {

						var $a = $(this).addClass("linkedHoverStates"),
							href = $a.attr("href");

						$a.hover(
							function () { selectLinks(href).addClass("hover"); },
							function () { selectLinks(href).removeClass("hover"); }
						);
					});
				}
			},
			formatDates = function (dateFormat) {

				if (dateFormat) {
					currentDateFormat = dateFormat;
				}

				$("#extended .entry .date").each(function () {

					var $this = $(this),
						time = $this.data("time"),
						formattedDate = time ? new Date(time).toString(currentDateFormat) : "";

					$this.text(formattedDate);
				});
			},
			localize = function (langs, lang, useBrowserLang) {

				var storedLang = amplify.store(settings.store.lang),
					browserLang, selected, key;

				if (langs[storedLang]) {
					lang = storedLang;
				} else if (useBrowserLang) {
					browserLang = navigator.language;
					if (langs[browserLang]) {
						lang = browserLang;
					} else if (browserLang.length > 2 && langs[browserLang.substr(0, 2)]) {
						lang = browserLang.substr(0, 2);
					}
				}

				if (!langs[lang]) {
					lang = "en";
				}

				selected = langs[lang];
				if (selected) {
					$.each(selected, function (key, value) {
						$(".l10n-" + key).text(value);
					});
					$(".lang").text(lang);
					$(".langOption").removeClass("current");
					$(".langOption." + lang).addClass("current");
				}

				formatDates(selected.dateFormat || settings.dateFormat);
			},
			initLangSelector = function (langs) {

				var $langOptions = $("#langSelector .langOptions"),
					sortedLangsKeys = [],
					$ul;

				$.each(langs, function (lang) {
					sortedLangsKeys.push(lang);
				});
				sortedLangsKeys.sort();

				$ul = $("<ul />");
				$.each(sortedLangsKeys, function (idx, lang) {
					$("<li class='langOption' />")
						.addClass(lang)
						.text(lang + " - " + langs[lang].lang)
						.appendTo($ul)
						.click(function () {
							amplify.store(settings.store.lang, lang);
							localize(langs, lang, false);
						});
				});
				$langOptions
					.append($ul)
					.scrollpanel();

				$("#langSelector").hover(
					function () {
						$langOptions
							.css("top", "-" + $langOptions.outerHeight() + "px")
							.stop(true, true)
							.fadeIn();
						$langOptions.get(0).updateScrollbar();
					},
					function () {
						$langOptions
							.stop(true, true)
							.fadeOut();
					}
				);
			},
			onIndicatorClick = function (event) {

				var $indicator = $(this),
					$entry = $indicator.closest(".entry"),
					updateTreeScrollbar = $("#tree").get(0).updateScrollbar;

				if ($indicator.hasClass("unknown")) {
					$.get(api(), { "action": "tree", "href": $entry.find("> a").attr("href") }, function (html) {

						var $content = $(html);

						$indicator.removeClass("unknown");
						if ($content.find("> li").size() === 0) {
							$indicator.replaceWith($("<span class='blank' />"));
						} else {
							$indicator.addClass("open");
							$entry.find("> .content").replaceWith($content);
							updateTreeScrollbar();
							$content.find(".indicator:not(.initiated)")
								.click(onIndicatorClick)
								.addClass("initiated");
						}
					});
				} else if ($indicator.hasClass("open")) {
					$indicator.removeClass("open");
					updateTreeScrollbar(true);
					$entry.find("> .content").slideUp(function () {
						updateTreeScrollbar();
					});
				} else {
					$indicator.addClass("open");
					updateTreeScrollbar(true);
					$entry.find("> .content").slideDown(function () {
						updateTreeScrollbar();
					});
				}
			},
			initIndicators = function () {

				$("#tree .entry.folder .indicator:not(.initiated)")
					.click(onIndicatorClick)
					.addClass("initiated");
			},
			getFileType = function (filename) {

				var dotidx = filename.lastIndexOf('.'),
					ext = dotidx >= 0 ? filename.substr(dotidx) : filename;

				return extToFileType[ext.toLowerCase()] || "unknown";
			},
			formatSizes = function () {

				$("#extended .entry .size").each(function () {

					var $this = $(this),
						bytes = $this.data("bytes"),
						formattedSize = bytes >= 0 ? H5AI.util.formatSize(bytes) : "";

					$this.text(formattedSize);
				});
			},
			setTotals = function () {

				var $extended = $("#extended");

				$(".folderTotal").text($extended.find(".entry.folder:not(.folder-parent)").length);
				$(".fileTotal").text($extended.find(".entry.file").length);
			},
			init = function () {

				initViews();
				viewmode();
				initTopSpace();
				initTree();
				linkHoverStates();
				initLangSelector(config.langs);
				localize(config.langs, settings.lang, settings.useBrowserLang);
				formatSizes();
				setTotals();
				initIndicators();
			};

		return {
			settings: settings,
			api: api,
			image: image,
			icon: icon,
			shiftTree: shiftTree,
			linkHoverStates: linkHoverStates,
			initIndicators: initIndicators,
			formatDates: formatDates,
			getFileType: getFileType,
			init: init
		};
	}());

}(window, jQuery, H5AI, H5AI_CONFIG));