/* jshint esnext: true */
/* global require: false */

// Import the APIs we need.
let pageMod = require("page-mod");
let Request = require("request").Request;
let self = require("self");
let tabs = require("tabs");
let ss = require("simple-storage");
let priv = require("private-browsing");
let windows = require("sdk/windows").browserWindows;

// require chrome allows us to use XPCOM objects...
const {Cc,Ci,Cu,components} = require("chrome");
let historyService = Cc["@mozilla.org/browser/history;1"].getService(Ci.mozIAsyncHistory);

// Cookie manager for new API login
let cookieManager = Cc["@mozilla.org/cookiemanager;1"].getService().QueryInterface(Ci.nsICookieManager2);
components.utils.import("resource://gre/modules/NetUtil.jsm");

// Preferences
let prefs = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefBranch);

// this function takes in a string (and optional charset, paseURI) and creates an nsURI object, which is required by historyService.addURI...
function makeURI(aURL, aOriginCharset, aBaseURI) {
	let ioService = Cc["@mozilla.org/network/io-service;1"].getService(Ci.nsIIOService);
	return ioService.newURI(aURL, aOriginCharset, aBaseURI);
}

let workers = [];
function detachWorker(worker, workerArray) {
	let index = workerArray.indexOf(worker);
	if (index !== -1) {
		workerArray.splice(index, 1);
	}
}

let localStorage = ss.storage;

localStorage.getItem = function(key) {
	return ss.storage[key];
};
localStorage.setItem = function(key, value) {
	ss.storage[key] = value;
};
localStorage.removeItem = function(key) {
	delete ss.storage[key];
};

let XHRCache = {
	forceCache: false,
	capacity: 250,
	entries: {},
	count: 0,
	check: function(key) {
		if (key in this.entries) {
//			console.log("hit");
			this.entries[key].hits++;
			return this.entries[key].data;
		} else {
//			console.log("miss");
			return null;
		}
	},
	add: function(key, value) {
		if (key in this.entries) {
			return;
		} else {
//			console.log("add");
			this.entries[key] = {data: value, timestamp: Date.now(), hits: 1};
			this.count++;
		}
		if (this.count > this.capacity) {
			this.prune();
		}
	},
	prune: function() {
		let now = Date.now();
		let bottom = [];
		for (let key in this.entries) {
//			if (this.entries[key].hits === 1) {
//				delete this.entries[key];
//				this.count--;
//				continue;
//			}

			//Weight by hits/age which is similar to reddit's hit/controversial sort orders
			bottom.push({
				key: key,
				weight: this.entries[key].hits/(now - this.entries[key].timestamp)
			});
		}
		bottom.sort(function(a,b){return a.weight-b.weight;});
		let count = this.count - Math.floor(this.capacity / 2);
		for (let i = 0; i < count; i++) {
			delete this.entries[bottom[i].key];
			this.count--;
		}
//		console.log("prune");
	},
	clear: function() {
		this.entries = {};
		this.count = 0;
	}
};
tabs.on('activate', function(tab) {
	// find this worker...
	for (let i in workers) {
		if ((typeof workers[i].tab !== 'undefined') && (tab.title === workers[i].tab.title)) {
			workers[i].postMessage({ name: "getLocalStorage", message: localStorage });
		}
	}
});


pageMod.PageMod({
	include: ["*.reddit.com"],
	contentScriptWhen: 'start',
	contentScriptFile: [
		self.data.url('jquery-1.10.2.min.js'),
		self.data.url('guiders-1.2.8.js'),
		self.data.url('jquery.dragsort-0.6.js'),
		self.data.url('jquery-fieldselection.min.js'),
		self.data.url('tinycon.js'),
		self.data.url('jquery.tokeninput.js'),
		self.data.url('snuownd.js'),
		self.data.url('utils.js'),
		self.data.url('browsersupport.js'),
		self.data.url('console.js'),
		self.data.url('alert.js'),
		self.data.url('storage.js'),
		self.data.url('template.js'),
		self.data.url('konami.js'),
		self.data.url('mediacrush.js'),
		self.data.url('hogan-2.0.0.js'),
		self.data.url('reddit_enhancement_suite.user.js'),
		self.data.url('modules/betteReddit.js'),
		self.data.url('modules/userTagger.js'),
		self.data.url('modules/keyboardNav.js'),
		self.data.url('modules/commandLine.js'),
		self.data.url('modules/about.js'),
		self.data.url('modules/hover.js'),
		self.data.url('modules/subredditTagger.js'),
		self.data.url('modules/uppersAndDowners.js'),
		self.data.url('modules/singleClick.js'),
		self.data.url('modules/commentPreview.js'),
		self.data.url('modules/commentTools.js'),
		self.data.url('modules/sortCommentsTemporarily.js'),
		self.data.url('modules/usernameHider.js'),
		self.data.url('modules/showImages.js'),
		self.data.url('modules/showKarma.js'),
		self.data.url('modules/hideChildComments.js'),
		self.data.url('modules/showParent.js'),
		self.data.url('modules/neverEndingReddit.js'),
		self.data.url('modules/saveComments.js'),
		self.data.url('modules/userHighlight.js'),
		self.data.url('modules/styleTweaks.js'),
		self.data.url('modules/accountSwitcher.js'),
		self.data.url('modules/filteReddit.js'),
		self.data.url('modules/newCommentCount.js'),
		self.data.url('modules/spamButton.js'),
		self.data.url('modules/commentNavigator.js'),
		self.data.url('modules/subredditManager.js'),
		self.data.url('modules/RESTips.js'),
		self.data.url('modules/settingsNavigation.js'),
		self.data.url('modules/dashboard.js'),
		self.data.url('modules/notifications.js'),
		self.data.url('modules/subredditInfo.js'),
		self.data.url('modules/commentHidePersistor.js'),
		self.data.url('modules/bitcointip.js'),
		self.data.url('modules/troubleshooter.js'),
		self.data.url('modules/tests.js'),
		self.data.url('init.js')
	],
	contentStyleFile: [
		self.data.url('nightmode.css'),
		self.data.url('commentBoxes.css'),
		self.data.url('res.css'),
		self.data.url('guiders.css'),
		self.data.url('tokenize.css'),
		self.data.url('fitbamob.css'),
		self.data.url("batch.css")
	],
	onAttach: function(worker) {
		// when a tab is activated, repopulate localStorage so that changes propagate across tabs...
		workers.push(worker);
		worker.on('detach', function () {
			detachWorker(this, workers);
		});
		worker.on('message', function(data) {
			let request = data,
				inBackground = prefs.getBoolPref('browser.tabs.loadInBackground') || true,
				isPrivate, thisLinkURL;

			switch (request.requestType) {
				case 'readResource':
					let fileData = self.data.load(request.filename);
					worker.postMessage({ name: 'readResource', data: fileData, transaction: request.transaction });
					break;
				case 'deleteCookie':
					cookieManager.remove('.reddit.com', request.cname, '/', false);
					break;
				case 'GM_xmlhttpRequest':
					let responseObj = {
						XHRID: request.XHRID,
						name: request.requestType
					};
					if (request.aggressiveCache || XHRCache.forceCache) {
						let cachedResult = XHRCache.check(request.url);
						if (cachedResult) {
							responseObj.response = cachedResult;
							worker.postMessage(responseObj);
							return;
						}
					}
					if (request.method === 'POST') {
						Request({
							url: request.url,
							onComplete: function(response) {
								responseObj.response = {
									responseText: response.text,
									status: response.status
								};
								//Only cache on HTTP OK and non empty body
								if ((request.aggressiveCache || XHRCache.forceCache) && (response.status === 200 && response.text)) {
									XHRCache.add(request.url, responseObj.response);
								}
								worker.postMessage(responseObj);
							},
							headers: request.headers,
							content: request.data
						}).post();
					} else {
						Request({
							url: request.url,
							onComplete: function(response) {
								responseObj.response = {
									responseText: response.text,
									status: response.status
								};
								if ((request.aggressiveCache || XHRCache.forceCache) && (response.status === 200 && response.text)) {
									XHRCache.add(request.url, responseObj.response);
								}
								worker.postMessage(responseObj);
							},
							headers: request.headers,
							content: request.data
						}).get();
					}

					break;
				case 'singleClick':
					inBackground = ((request.button === 1) || (request.ctrl === 1));
					isPrivate = priv.isPrivate(windows.activeWindow);

					// handle requests from singleClick module
					if (request.openOrder === 'commentsfirst') {
						// only open a second tab if the link is different...
						if (request.linkURL !== request.commentsURL) {
							tabs.open({url: request.commentsURL, inBackground: inBackground, isPrivate: isPrivate });
						}
						tabs.open({url: request.linkURL, inBackground: inBackground, isPrivate: isPrivate });
					} else {
						tabs.open({url: request.linkURL, inBackground: inBackground, isPrivate: isPrivate });
						// only open a second tab if the link is different...
						if (request.linkURL !== request.commentsURL) {
							tabs.open({url: request.commentsURL, inBackground: inBackground, isPrivate: isPrivate });
						}
					}
					worker.postMessage({status: "success"});
					break;
				case 'keyboardNav':
					isPrivate = priv.isPrivate(windows.activeWindow);

					// handle requests from keyboardNav module
					thisLinkURL = request.linkURL;
					if (thisLinkURL.toLowerCase().substring(0, 4) !== 'http') {
						thisLinkURL = (thisLinkURL.substring(0, 1) === '/') ? 'http://www.reddit.com' + thisLinkURL : location.href + thisLinkURL;
					}
					// Get the selected tab so we can get the index of it.  This allows us to open our new tab as the "next" tab.
					tabs.open({url: thisLinkURL, inBackground: inBackground, isPrivate: isPrivate });
					worker.postMessage({status: "success"});
					break;
				case 'openLinkInNewTab':
					inBackground = (request.focus !== true);
					isPrivate = priv.isPrivate(windows.activeWindow);

					thisLinkURL = request.linkURL;
					if (thisLinkURL.toLowerCase().substring(0, 4) !== 'http') {
						thisLinkURL = (thisLinkURL.substring(0, 1) === '/') ? 'http://www.reddit.com' + thisLinkURL : location.href + thisLinkURL;
					}
					// Get the selected tab so we can get the index of it.  This allows us to open our new tab as the "next" tab.
					tabs.open({url: thisLinkURL, inBackground: inBackground, isPrivate: isPrivate });
					worker.postMessage({status: "success"});
					break;
				case 'loadTweet':
					Request({
						url: request.url,
						onComplete: function(response) {
							let resp = JSON.parse(response.text);
							let responseObj = {
								name: 'loadTweet',
								response: resp
							};
							worker.postMessage(responseObj);
						},
						headers: request.headers,
						content: request.data
					}).get();
					break;
				case 'getLocalStorage':
					worker.postMessage({ name: 'getLocalStorage', message: localStorage });
					break;
				case 'saveLocalStorage':
					for (let key in request.data) {
						localStorage.setItem(key,request.data[key]);
					}
					localStorage.setItem('importedFromForeground', true);
					worker.postMessage({ name: 'saveLocalStorage', message: localStorage });
					break;
				case 'localStorage':
					switch (request.operation) {
						case 'getItem':
							worker.postMessage({status: true, value: localStorage.getItem(request.itemName)});
							break;
						case 'removeItem':
							localStorage.removeItem(request.itemName);
							// worker.postMessage({status: true, value: null});
							break;
						case 'setItem':
							localStorage.setItem(request.itemName, request.itemValue);
							break;
					}
					break;
				case 'XHRCache':
					switch (request.operation) {
						case 'clear':
							XHRCache.clear();
							break;
					}
					break;
				case 'addURLToHistory':
					isPrivate = priv.isPrivate(windows.activeWindow);
					if (isPrivate) {
						// do not add to history if in private browsing mode!
						return false;
					}
					let uri = makeURI(request.url);
					historyService.updatePlaces({
						uri: uri,
						visits: [{
							transitionType: Ci.nsINavHistoryService.TRANSITION_LINK,
							visitDate: Date.now() * 1000
						}]
					});
					break;
				default:
					worker.postMessage({status: "unrecognized request type"});
					break;
			}
		});
	}
});