var lastUpdatedStyleId = null;
var installed;

var appliesToExtraTemplate = document.createElement("span");
appliesToExtraTemplate.className = "applies-to-extra";
appliesToExtraTemplate.innerHTML = " " + t('appliesDisplayTruncatedSuffix');

chrome.runtime.sendMessage({method: "getStyles"}, showStyles);

function showStyles(styles) {
	if (!styles) { // Chrome is starting up
		chrome.runtime.sendMessage({method: "getStyles"}, showStyles);
		return;
	}
	if (!installed) {
		// "getStyles" message callback is invoked before document is loaded,
		// postpone the action until DOMContentLoaded is fired
		document.stylishStyles = styles;
		return;
	}
	styles.sort(function(a, b) { return a.name.localeCompare(b.name)});
	styles.map(createStyleElement).forEach(function(e) {
		installed.appendChild(e);
	});
	if (history.state) {
		window.scrollTo(0, history.state.scrollY);
	}
}

function createStyleElement(style) {
	var e = template.style.cloneNode(true);
	e.setAttribute("class", style.enabled ? "enabled" : "disabled");
	e.setAttribute("style-id", style.id);
	if (style.updateUrl) {
		e.setAttribute("style-update-url", style.updateUrl);
	}
	if (style.md5Url) {
		e.setAttribute("style-md5-url", style.md5Url);
	}
	if (style.originalMd5) {
		e.setAttribute("style-original-md5", style.originalMd5);
	}

	var styleName = e.querySelector(".style-name");
	styleName.appendChild(document.createTextNode(style.name));
	if (style.url) {
		var homepage = template.styleHomepage.cloneNode(true)
		homepage.setAttribute("href", style.url);
		styleName.appendChild(document.createTextNode(" " ));
		styleName.appendChild(homepage);
	}
	var domains = [];
	var urls = [];
	var urlPrefixes = [];
	var regexps = [];
	function add(array, property) {
		style.sections.forEach(function(section) {
			if (section[property]) {
				section[property].filter(function(value) {
					return array.indexOf(value) == -1;
				}).forEach(function(value) {
					array.push(value);
				});;
			}
		});
	}
	add(domains, 'domains');
	add(urls, 'urls');
	add(urlPrefixes, 'urlPrefixes');
	add(regexps, 'regexps');
	var appliesToToShow = [];
	if (domains)
		appliesToToShow = appliesToToShow.concat(domains);
	if (urls)
		appliesToToShow = appliesToToShow.concat(urls);
	if (urlPrefixes)
		appliesToToShow = appliesToToShow.concat(urlPrefixes.map(function(u) { return u + "*"; }));
	if (regexps)
		appliesToToShow = appliesToToShow.concat(regexps.map(function(u) { return "/" + u + "/"; }));
	var appliesToString = "";
	var showAppliesToExtra = false;
	if (appliesToToShow.length == "")
		appliesToString = t('appliesToEverything');
	else if (appliesToToShow.length <= 10)
		appliesToString = appliesToToShow.join(", ");
	else {
		appliesToString = appliesToToShow.slice(0, 10).join(", ");
		showAppliesToExtra = true;
	}
	e.querySelector(".applies-to").appendChild(document.createTextNode(t('appliesDisplay', [appliesToString])));
	if (showAppliesToExtra) {
		e.querySelector(".applies-to").appendChild(appliesToExtraTemplate.cloneNode(true));
	}
	var editLink = e.querySelector(".style-edit-link");
	editLink.setAttribute("href", editLink.getAttribute("href") + style.id);
	editLink.addEventListener("click", function(event) {
		if (!event.altKey) {
			var left = event.button == 0, middle = event.button == 1,
				shift = event.shiftKey, ctrl = event.ctrlKey;
			var openWindow = left && shift && !ctrl;
			var openBackgroundTab = (middle && !shift) || (left && ctrl && !shift);
			var openForegroundTab = (middle && shift) || (left && ctrl && shift);
			var url = event.target.href || event.target.parentNode.href;
			event.preventDefault();
			event.stopPropagation();
			if (openWindow || openBackgroundTab || openForegroundTab) {
				if (openWindow) {
					var options = prefs.get("windowPosition");
					options.url = url;
					chrome.windows.create(options);
				} else {
					chrome.runtime.sendMessage({
						method: "openURL",
						url: url,
						active: openForegroundTab
					});
				}
			} else {
				history.replaceState({scrollY: window.scrollY}, document.title);
				getActiveTab(function(tab) {
					sessionStorageHash("manageStylesHistory").set(tab.id, url);
					location.href = url;
				});
			}
		}
	});
	e.querySelector(".enable").addEventListener("click", function(event) { enable(event, true); }, false);
	e.querySelector(".disable").addEventListener("click", function(event) { enable(event, false); }, false);
	e.querySelector(".check-update").addEventListener("click", doCheckUpdate, false);
	e.querySelector(".update").addEventListener("click", doUpdate, false);
	e.querySelector(".delete").addEventListener("click", doDelete, false);
	return e;
}

function enable(event, enabled) {
	var id = getId(event);
	enableStyle(id, enabled);
}

function doDelete() {
	if (!confirm(t('deleteStyleConfirm'))) {
		return;
	}
	var id = getId(event);
	deleteStyle(id);
}

function getId(event) {
	return getStyleElement(event).getAttribute("style-id");
}

function getStyleElement(event) {
	var e = event.target;
	while (e) {
		if (e.hasAttribute("style-id")) {
			return e;
		}
		e = e.parentNode;
	}
	return null;
}

chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) {
	switch (request.method) {
		case "styleUpdated":
			handleUpdate(request.style);
			break;
		case "styleAdded":
			installed.appendChild(createStyleElement(request.style));
			break;
		case "styleDeleted":
			handleDelete(request.id);
			break;
	}
});

function handleUpdate(style) {
	var element = createStyleElement(style);
	installed.replaceChild(element, installed.querySelector("[style-id='" + style.id + "']"));
	if (style.id == lastUpdatedStyleId) {
		lastUpdatedStyleId = null;
		element.className = element.className += " update-done";
		element.querySelector(".update-note").innerHTML = t('updateCompleted');
	};
}

function handleDelete(id) {
	var node = installed.querySelector("[style-id='" + id + "']");
	if (node) {
		installed.removeChild(node);
	}
}

function doCheckUpdate(event) {
	checkUpdate(getStyleElement(event));
}

function applyUpdateAll() {
	var btnApply = document.getElementById("apply-all-updates");
	btnApply.disabled = true;
	setTimeout(function() {
		btnApply.style.display = "none";
		btnApply.disabled = false;
	}, 1000);

	Array.prototype.forEach.call(document.querySelectorAll(".can-update .update"), function(button) {
		button.click();
	});
}

function checkUpdateAll() {
	var btnCheck = document.getElementById("check-all-updates");
	var btnApply = document.getElementById("apply-all-updates");
	var noUpdates = document.getElementById("update-all-no-updates");

	btnCheck.disabled = true;
	btnApply.classList.add("hidden");
	noUpdates.classList.add("hidden");

	var elements = document.querySelectorAll("[style-update-url]");
	var toCheckCount = elements.length;
	var updatableCount = 0;
	Array.prototype.forEach.call(elements, function(element) {
		checkUpdate(element, function(success) {
			if (success) {
				++updatableCount;
			}
			if (--toCheckCount == 0) {
				btnCheck.disabled = false;
				if (updatableCount) {
					btnApply.classList.remove("hidden");
				} else {
					noUpdates.classList.remove("hidden");
					setTimeout(function() {
						noUpdates.classList.add("hidden");
					}, 10000);
				}
			}
		});
	});
}

function checkUpdate(element, callback) {
	element.querySelector(".update-note").innerHTML = t('checkingForUpdate');
	element.className = element.className.replace("checking-update", "").replace("no-update", "").replace("can-update", "") + " checking-update";
	var id = element.getAttribute("style-id");
	var url = element.getAttribute("style-update-url");
	var md5Url = element.getAttribute("style-md5-url");
	var originalMd5 = element.getAttribute("style-original-md5");

	function handleSuccess(forceUpdate, serverJson) {
		chrome.runtime.sendMessage({method: "getStyles", id: id}, function(styles) {
			var style = styles[0];
			var needsUpdate = false;
			if (!forceUpdate && codeIsEqual(style.sections, serverJson.sections)) {
				handleNeedsUpdate("no", id, serverJson);
			} else {
				handleNeedsUpdate("yes", id, serverJson);
				needsUpdate = true;
			}
			if (callback) {
				callback(needsUpdate);
			}
		});
	}

	function handleFailure(status) {
		if (status == 0) {
			handleNeedsUpdate(t('updateCheckFailServerUnreachable'), id, null);
		} else {
			handleNeedsUpdate(t('updateCheckFailBadResponseCode', [status]), id, null);
		}
		if (callback) {
			callback(false);
		}
	}

	if (!md5Url || !originalMd5) {
		checkUpdateFullCode(url, false, handleSuccess, handleFailure)
	} else {
		checkUpdateMd5(originalMd5, md5Url, function(needsUpdate) {
			if (needsUpdate) {
				// If the md5 shows a change we will update regardless of whether the code looks different
				checkUpdateFullCode(url, true, handleSuccess, handleFailure);
			} else {
				handleNeedsUpdate("no", id, null);
				if (callback) {
					callback(false);
				}
			}
		}, handleFailure);
	}
}

function checkUpdateFullCode(url, forceUpdate, successCallback, failureCallback) {
	download(url, function(responseText) {
		successCallback(forceUpdate, JSON.parse(responseText));
	}, failureCallback);
}

function checkUpdateMd5(originalMd5, md5Url, successCallback, failureCallback) {
	download(md5Url, function(responseText) {
		if (responseText.length != 32) {
			failureCallback(-1);
			return;
		}
		successCallback(responseText != originalMd5);
	}, failureCallback);
}

function download(url, successCallback, failureCallback) {
	var xhr = new XMLHttpRequest();
	xhr.onreadystatechange = function (aEvt) {
		if (xhr.readyState == 4) {
			if (xhr.status == 200) {
				successCallback(xhr.responseText)
			} else {
				failureCallback(xhr.status);
			}
		}
	}
	if (url.length > 2000) {
		var parts = url.split("?");
		xhr.open("POST", parts[0], true);
		xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");
		xhr.send(parts[1]);
	} else {
		xhr.open("GET", url, true);
		xhr.send();
	}
}

function handleNeedsUpdate(needsUpdate, id, serverJson) {
	var e = document.querySelector("[style-id='" + id + "']");
	e.className = e.className.replace("checking-update", "");
	switch (needsUpdate) {
		case "yes":
			e.className += " can-update";
			e.updatedCode = serverJson;
			e.querySelector(".update-note").innerHTML = '';
			break;
		case "no":
			e.className += " no-update";
			e.querySelector(".update-note").innerHTML = t('updateCheckSucceededNoUpdate');
			break;
		default:
			e.className += " no-update";
			e.querySelector(".update-note").innerHTML = needsUpdate;
	}
}

function doUpdate(event) {
	var element = getStyleElement(event);

	var updatedCode = element.updatedCode;
	// update everything but name
	delete updatedCode.name;
	updatedCode.id = element.getAttribute('style-id');
	updatedCode.method = "saveStyle";

	// updating the UI will be handled by the general update listener
	lastUpdatedStyleId = updatedCode.id;
	chrome.runtime.sendMessage(updatedCode, function () {});
}

function codeIsEqual(a, b) {
	if (a.length != b.length) {
		return false;
	}
	var properties = ["code", "urlPrefixes", "urls", "domains", "regexps"];
	for (var i = 0; i < a.length; i++) {
		var found = false;
		for (var j = 0; j < b.length; j++) {
			var allEquals = properties.every(function(property) {
				return jsonEquals(a[i], b[j], property);
			});
			if (allEquals) {
				found = true;
				break;
			}
		}
		if (!found) {
			return false;
		}
	}
	return true;
}

function jsonEquals(a, b, property) {
	var aProp = a[property], typeA = getType(aProp);
	var bProp = b[property], typeB = getType(bProp);
	if (typeA != typeB) {
		// consider empty arrays equivalent to lack of property
		if ((typeA == "undefined" || (typeA == "array" && aProp.length == 0)) && (typeB == "undefined" || (typeB == "array" && bProp.length == 0))) {
			return true;
		}
		return false;
	}
	if (typeA == "undefined") {
		return true;
	}
	if (typeA == "array") {
		if (aProp.length != bProp.length) {
			return false;
		}
		for (var i = 0; i < aProp.length; i++) {
			if (bProp.indexOf(aProp[i]) == -1) {
				return false;
			}
		}
		return true;
	}
	if (typeA == "string") {
		return aProp == bProp;
	}
}

function searchStyles(immediately) {
	var query = document.getElementById("search").value.toLocaleLowerCase();
	if (query == (searchStyles.lastQuery || "")) {
		return;
	}
	searchStyles.lastQuery = query;
	if (immediately) {
		doSearch();
	} else {
		clearTimeout(searchStyles.timeout);
		searchStyles.timeout = setTimeout(doSearch, 100);
	}
	function doSearch() {
		chrome.runtime.sendMessage({method: "getStyles"}, function(styles) {
			styles.forEach(function(style) {
				var el = document.querySelector("[style-id='" + style.id + "']");
				if (el) {
					el.style.display = !query || isMatchingText(style.name) || isMatchingStyle(style) ? "" : "none";
				}
			});
		});
	}
	function isMatchingStyle(style) {
		return style.sections.some(function(section) {
			return Object.keys(section).some(function(key) {
				var value = section[key];
				switch (typeof value) {
					case "string": return isMatchingText(value);
					case "object": return value.some(isMatchingText);
				}
			});
		});
	}
	function isMatchingText(text) {
		return text.toLocaleLowerCase().indexOf(query) >= 0;
	}
}

function onFilterChange (className, event) {
	installed.classList.toggle(className, event.target.checked);
}
function initFilter(className, node) {
	node.addEventListener("change", onFilterChange.bind(undefined, className), false);
	onFilterChange(className, {target: node});
}

function importStyles (e) {
	var file = e.target.files[0];
	var reader = new FileReader();
	var styles = [];

	function save () {
		var style = styles.shift();
		if (style) {
			delete style.id;
			saveStyle(style, save);
		}
		else {
			window.location.reload()
		}
	}

  reader.onloadend = function (evt) {
    try {
    	styles = JSON.parse(evt.target.result);
    	save();
    }
    catch (e) {
    	window.alert(e.message);
    }
  };
  reader.onerror = function (e) {
  	window.alert(e.message);
  }
  reader.readAsText(file)
}

function selectAll () {
	document.execCommand('selectAll');
}

document.addEventListener("DOMContentLoaded", function() {
	installed = document.getElementById("installed");
	if (document.stylishStyles) {
		showStyles(document.stylishStyles);
		delete document.stylishStyles;
	}

	document.getElementById("check-all-updates").addEventListener("click", checkUpdateAll);
	document.getElementById("apply-all-updates").addEventListener("click", applyUpdateAll);
	document.getElementById("search").addEventListener("input", searchStyles);
	searchStyles(true); // re-apply filtering on history Back

	document.querySelector('input[type=file]').addEventListener('change', importStyles);
	document.querySelector('#import pre').addEventListener('click', selectAll);

	setupLivePrefs([
		"manage.onlyEnabled",
		"manage.onlyEdited",
		"show-badge",
		"popup.stylesFirst"
	]);
	initFilter("enabled-only", document.getElementById("manage.onlyEnabled"));
	initFilter("edited-only", document.getElementById("manage.onlyEdited"));

});