var path = require('path'),
	fs = require('fs'),
	nconf = require('nconf'),
	express = require('express'),
	express_namespace = require('express-namespace'),
	WebServer = express(),
	server,
	winston = require('winston'),
	validator = require('validator'),
	async = require('async'),
	S = require('string'),
	qs = require('querystring'),

	pkg = require('../package.json'),

	utils = require('../public/src/utils'),
	db = require('./database'),
	user = require('./user'),
	categories = require('./categories'),
	CategoryTools = require('./categoryTools'),
	posts = require('./posts'),
	topics = require('./topics'),
	ThreadTools = require('./threadTools'),
	notifications = require('./notifications'),
	auth = require('./routes/authentication'),
	meta = require('./meta'),
	plugins = require('./plugins'),
	logger = require('./logger'),
	templates = require('./../public/src/templates'),
	translator = require('./../public/src/translator'),
	controllers = require('./controllers'),

	admin = require('./routes/admin'),
	userRoute = require('./routes/user'),
	apiRoute = require('./routes/api'),
	feedsRoute = require('./routes/feeds'),
	metaRoute = require('./routes/meta');

if(nconf.get('ssl')) {
	server = require('https').createServer({
		key: fs.readFileSync(nconf.get('ssl').key),
		cert: fs.readFileSync(nconf.get('ssl').cert)
	}, WebServer);
} else {
	server = require('http').createServer(WebServer);
}

module.exports.server = server;

// Signals
var	shutdown = function(code) {
		winston.info('[app] Shutdown (SIGTERM/SIGINT) Initialised.');
		db.close();
		winston.info('[app] Database connection closed.');

		winston.info('[app] Shutdown complete.');
		process.exit();
	},
	restart = function() {
		if (process.send) {
			winston.info('[app] Restarting...');
			process.send('nodebb:restart');
		} else {
			winston.error('[app] Could not restart server. Shutting down.');
			shutdown();
		}
	};
process.on('SIGTERM', shutdown);
process.on('SIGINT', shutdown);
process.on('SIGHUP', restart);
process.on('uncaughtException', function(err) {
	winston.error('[app] Encountered Uncaught Exception: ' + err.message);
	console.log(err.stack);
	restart();
});

(function (app) {
	"use strict";

	var	clientScripts;

	plugins.ready(function() {
		// Minify client-side libraries
		meta.js.get(function (err, scripts) {
			clientScripts = scripts.map(function (script) {
				script = {
					script: script
				};

				return script;
			});
		});
	});

	app.prepareAPI = function(req, res, next) {
		res.locals.isAPI = true;
		next();
	};

	app.authenticate = function(req, res, next) {
		if(!req.user) {
			if (res.locals.isAPI) {
				return res.json(403, 'not-allowed');	
			} else {
				return res.redirect('403');
			}
		} else {
			next();
		}
	};

	app.checkGlobalPrivacySettings = function(req, res, next) {
		if(!req.user && !!parseInt(meta.config.privateUserInfo, 10)) {
			if (res.locals.isAPI) {
				return res.json(403, 'not-allowed');
			} else {
				return res.redirect('403');
			}
		}

		next();
	};

	app.buildHeader = function(req, res, next) {
		async.parallel([
			function(next) {
				// temp, don't forget to set metaTags and linkTags to res.locals.header
				app.build_header({
					req: req,
					res: res
				}, function(err, template) {
					res.locals.header = template;
					next(err);
				});
			},
			function(next) {
				app.render('footer', {}, function(err, template) {
					res.locals.footer = template;
					next(err);
				});
			}
		], function(err) {
			next();
		});
	};

	/**
	 *	`options` object	requires:	req, res
	 *						accepts:	metaTags, linkTags
	 */
	app.build_header = function (options, callback) {
		var custom_header = {
			'navigation': []
		};

		plugins.fireHook('filter:header.build', custom_header, function(err, custom_header) {
			var defaultMetaTags = [{
					name: 'viewport',
					content: 'width=device-width, initial-scale=1.0, user-scalable=no'
				}, {
					name: 'content-type',
					content: 'text/html; charset=UTF-8'
				}, {
					name: 'apple-mobile-web-app-capable',
					content: 'yes'
				}, {
					property: 'og:site_name',
					content: meta.config.title || 'NodeBB'
				}, {
					property: 'keywords',
					content: meta.config.keywords || ''
				}],
				defaultLinkTags = [{
					rel: 'apple-touch-icon',
					href: '/apple-touch-icon'
				}],
				templateValues = {
					bootswatchCSS: meta.config['theme:src'],
					pluginCSS: plugins.cssFiles.map(function(file) { return { path: nconf.get('relative_path') + file.replace(/\\/g, '/') }; }),
					title: meta.config.title || '',
					description: meta.config.description || '',
					'brand:logo': meta.config['brand:logo'] || '',
					'brand:logo:display': meta.config['brand:logo']?'':'hide',
					csrf: options.res.locals.csrf_token,
					relative_path: nconf.get('relative_path'),
					clientScripts: clientScripts,
					navigation: custom_header.navigation,
					'cache-buster': meta.config['cache-buster'] ? 'v=' + meta.config['cache-buster'] : '',
					allowRegistration: meta.config.allowRegistration === undefined || parseInt(meta.config.allowRegistration, 10) === 1,
					searchEnabled: plugins.hasListeners('filter:search.query') ? true : false
				},
				escapeList = {
					'&': '&',
					'<': '&lt;',
					'>': '&gt;',
					"'": '&apos;',
					'"': '&quot;'
				};

			var uid = '0';

			// Meta Tags
			/*templateValues.metaTags = defaultMetaTags.concat(options.metaTags || []).map(function(tag) {
				if(!tag || typeof tag.content !== 'string') {
					winston.warn('Invalid meta tag. ', tag);
					return tag;
				}

				tag.content = tag.content.replace(/[&<>'"]/g, function(tag) {
					return escapeList[tag] || tag;
				});
				return tag;
			});*/

			// Link Tags
			/*templateValues.linkTags = defaultLinkTags.concat(options.linkTags || []);
			templateValues.linkTags.push({
				rel: "icon",
				type: "image/x-icon",
				href: nconf.get('relative_path') + '/favicon.ico'
			});*/

			if(options.req.user && options.req.user.uid) {
				uid = options.req.user.uid;
			}

			// Custom CSS
			templateValues.useCustomCSS = false;
			if (meta.config.useCustomCSS === '1') {
				templateValues.useCustomCSS = true;
				templateValues.customCSS = meta.config.customCSS;
			}

			async.parallel([
				function(next) {
					translator.get('pages:' + path.basename(options.req.url), function(translated) {
						/*var	metaTitle = templateValues.metaTags.filter(function(tag) {
								return tag.name === 'title';
							});
						if (translated) {
							templateValues.browserTitle = translated;
						} else if (metaTitle.length > 0 && metaTitle[0].content) {
							templateValues.browserTitle = metaTitle[0].content;
						} else {
							templateValues.browserTitle = meta.config.browserTitle || 'NodeBB';
						}*/

						next();
					});
				},
				function(next) {
					user.isAdministrator(uid, function(err, isAdmin) {
						templateValues.isAdmin = isAdmin || false;
						next();
					});
				}
			], function() {
				/*translator.translate(templates.header.parse(templateValues), function(template) {
					callback(null, template);
				});*/
				app.render('header', templateValues, function(err, template) {
					callback(null, template)
				});
			});
		});
	};

	// Cache static files on production
	if (global.env !== 'development') {
		app.enable('cache');
		app.enable('minification');

		// Configure cache-buster timestamp
		require('child_process').exec('git describe --tags', {
			cwd: path.join(__dirname, '../')
		}, function(err, stdOut) {
			if (!err) {
				meta.config['cache-buster'] = stdOut.trim();
				// winston.info('[init] Cache buster value set to: ' + stdOut);
			} else {
				fs.stat(path.join(__dirname, '../package.json'), function(err, stats) {
					meta.config['cache-buster'] = new Date(stats.mtime).getTime();
				});
			}
		});
	}

	// Middlewares
	app.configure(function() {
		app.engine('tpl', templates.__express);
		app.set('view engine', 'tpl');
		app.set('views', path.join(__dirname, '../public/templates'));

		async.series([
			function(next) {
				// Pre-router middlewares
				app.use(express.compress());

				logger.init(app);

				// favicon & apple-touch-icon middleware
				app.use(express.favicon(path.join(__dirname, '../', 'public', meta.config['brand:favicon'] ? meta.config['brand:favicon'] : 'favicon.ico')));
				app.use('/apple-touch-icon', function(req, res) {
					if (meta.config['brand:logo'] && validator.isURL(meta.config['brand:logo'])) {
						return res.redirect(meta.config['brand:logo']);
					} else {
						return res.sendfile(path.join(__dirname, '../public', meta.config['brand:logo'] || nconf.get('relative_path') + '/logo.png'), {
							maxAge: app.enabled('cache') ? 5184000000 : 0
						});
					}
				});

				app.use(require('less-middleware')({
					src: path.join(__dirname, '../', 'public'),
					prefix: nconf.get('relative_path'),
					yuicompress: app.enabled('minification') ? true : false
				}));
				app.use(express.bodyParser()); // Puts POST vars in request.body
				app.use(express.cookieParser()); // If you want to parse cookies (res.cookies)

				app.use(express.session({
					store: db.sessionStore,
					secret: nconf.get('secret'),
					key: 'express.sid',
					cookie: {
						maxAge: 1000 * 60 * 60 * 24 * parseInt(meta.configs.loginDays || 14, 10)
					}
				}));

				app.use(express.csrf());

				if (nconf.get('port') != 80 && nconf.get('port') != 443 && nconf.get('use_port') === false) {
					winston.info('Enabling \'trust proxy\'');
					app.enable('trust proxy');
				}

				if ((nconf.get('port') == 80 || nconf.get('port') == 443) && process.env.NODE_ENV !== 'development') {
					winston.info('Using ports 80 and 443 is not recommend; use a proxy instead. See README.md');
				}

				// Local vars, other assorted setup
				app.use(function (req, res, next) {
					res.locals.csrf_token = req.session._csrf;

					// Disable framing
					res.setHeader('X-Frame-Options', 'SAMEORIGIN');

					// Log IP address
					db.sortedSetAdd('ip:recent', +new Date(), req.ip || 'Unknown');

					next();
				});

				app.use(function(req, res, next) {
					// res.render post-processing middleware, modified from here: https://gist.github.com/mrlannigan/5051687
					var render = res.render;
					res.render = function(template, options, fn) {
						var self = this,
							options = options || {},
							req = this.req,
							app = req.app,
							defaultFn = function(err, str){
								if (err) {
									return req.next(err);
								}

								self.send(str);
							};

						if ('function' == typeof options) {
							fn = options, options = {};
						}

						if ('function' != typeof fn) {
							fn = defaultFn;
						}

						render.call(self, template, options, function(err, str) {
							if (res.locals.header) {
								str = res.locals.header + str;
							}

							if (res.locals.footer) {
								str = str + res.locals.footer;
							}

							if (str) {
								translator.translate(str, function(translated) {
									fn(err, translated);
								});
							} else {
								fn(err, str);
							}
						});
					};
					next();
				});

				// Authentication Routes
				auth.initialize(app);

				next();
			},
			function(next) {
				async.parallel([
					function(next) {

						db.getObjectFields('config', ['theme:type', 'theme:id', 'theme:staticDir', 'theme:templates'], function(err, themeData) {
							var themeId = (themeData['theme:id'] || 'nodebb-theme-vanilla');

							// Detect if a theme has been selected, and handle appropriately
							if (!themeData['theme:type'] || themeData['theme:type'] === 'local') {
								// Local theme
								if (process.env.NODE_ENV === 'development') {
									winston.info('[themes] Using theme ' + themeId);
								}

								// Theme's static directory
								if (themeData['theme:staticDir']) {
									app.use('/css/assets', express.static(path.join(nconf.get('themes_path'), themeData['theme:id'], themeData['theme:staticDir']), {
										maxAge: app.enabled('cache') ? 5184000000 : 0
									}));
									if (process.env.NODE_ENV === 'development') {
										winston.info('Static directory routed for theme: ' + themeData['theme:id']);
									}
								}

								if (themeData['theme:templates']) {
									app.use('/templates', express.static(path.join(nconf.get('themes_path'), themeData['theme:id'], themeData['theme:templates']), {
										maxAge: app.enabled('cache') ? 5184000000 : 0
									}));
									if (process.env.NODE_ENV === 'development') {
										winston.info('Custom templates directory routed for theme: ' + themeData['theme:id']);
									}
								}

								next();
							} else {
								// If not using a local theme (bootswatch, etc), drop back to vanilla
								if (process.env.NODE_ENV === 'development') {
									winston.info('[themes] Using theme ' + themeId);
								}

								app.use(require('less-middleware')({
									src: path.join(nconf.get('themes_path'), '/nodebb-theme-vanilla'),
									dest: path.join(__dirname, '../public/css'),
									prefix: nconf.get('relative_path') + '/css',
									yuicompress: app.enabled('minification') ? true : false
								}));

								next();
							}
						});

						// Route paths to screenshots for installed themes
						meta.themes.get(function(err, themes) {
							var	screenshotPath;

							async.each(themes, function(themeObj, next) {
								if (themeObj.screenshot) {
									screenshotPath = path.join(nconf.get('themes_path'), themeObj.id, themeObj.screenshot);
									(function(id, path) {
										fs.exists(path, function(exists) {
											if (exists) {
												app.get('/css/previews/' + id, function(req, res) {
													res.sendfile(path);
												});
											}
										});
									})(themeObj.id, screenshotPath);
								} else {
									next(false);
								}
							});
						});
					}
				], next);
			},
			function(next) {
				// Router & post-router middlewares
				app.use(app.router);

				// Static directory /public
				app.use(nconf.get('relative_path'), express.static(path.join(__dirname, '../', 'public'), {
					maxAge: app.enabled('cache') ? 5184000000 : 0
				}));

				// 404 catch-all
				app.use(function (req, res, next) {
					var	isLanguage = new RegExp('^' + nconf.get('relative_path') + '/language/[\\w]{2,}/.*.json'),
						isClientScript = new RegExp('^' + nconf.get('relative_path') + '\\/src\\/forum(\\/admin)?\\/[\\w]+\\.js');

					res.status(404);

					if (isClientScript.test(req.url)) {
						// Handle missing client-side scripts
						res.type('text/javascript').send(200, '');
					} else if (isLanguage.test(req.url)) {
						// Handle languages by sending an empty object
						res.json(200, {});
					} else if (req.accepts('html')) {
						// respond with html page
						if (process.env.NODE_ENV === 'development') {
							winston.warn('Route requested but not found: ' + req.url);
						}

						res.redirect(nconf.get('relative_path') + '/404');
					} else if (req.accepts('json')) {
						// respond with json
						if (process.env.NODE_ENV === 'development') {
							winston.warn('Route requested but not found: ' + req.url);
						}

						res.json({
							error: 'Not found'
						});
					} else {
						// default to plain-text. send()
						res.type('txt').send('Not found');
					}
				});

				app.use(function (err, req, res, next) {

					// we may use properties of the error object
					// here and next(err) appropriately, or if
					// we possibly recovered from the error, simply next().
					console.error(err.stack);
					var status = err.status || 500;
					res.status(status);

					res.json(status, {
						error: err.message
					});
				});

				next();
			}
		], function(err) {
			if (err) {
				winston.error('Errors were encountered while attempting to initialise NodeBB.');
				process.exit();
			} else {
				if (process.env.NODE_ENV === 'development') {
					winston.info('Middlewares loaded.');
				}
			}
		});
	});

	module.exports.init = function () {
		// translate all static templates served by webserver here. ex. footer, logout
		/*plugins.fireHook('filter:footer.build', '', function(err, appendHTML) {
			var footer = templates.footer.parse({
				footerHTML: appendHTML
			});

			translator.translate(footer, function(parsedTemplate) {
				templates.footer = parsedTemplate;
			});
		});*/

		plugins.fireHook('action:app.load', app);

		/*translator.translate(templates.logout.toString(), function(parsedTemplate) {
			templates.logout = parsedTemplate;
		});*/

		server.on("error", function(e){
			if (e.code === 'EADDRINUSE') {
				winston.error('NodeBB address in use, exiting...');
				process.exit(1);
			} else {
				throw e;
			}
		});

		var port = nconf.get('PORT') || nconf.get('port');
		winston.info('NodeBB attempting to listen on: ' + ((nconf.get('bind_address') === "0.0.0.0" || !nconf.get('bind_address')) ? '0.0.0.0' : nconf.get('bind_address')) + ':' + port);
		server.listen(port, nconf.get('bind_address'), function(){
			winston.info('NodeBB Ready');
		});
	};

	app.create_route = function (url, tpl) { // to remove
		var	routerScript = '<script> \
				ajaxify.initialLoad = true; \
				templates.ready(function(){ajaxify.go("' + url + '", null, true);}); \
			</script>';

		return routerScript;
	};

	app.namespace(nconf.get('relative_path'), function () {
		auth.registerApp(app);
		metaRoute.createRoutes(app);
		admin.createRoutes(app);
		userRoute.createRoutes(app);
		apiRoute.createRoutes(app);
		feedsRoute.createRoutes(app);

		// Basic Routes (entirely client-side parsed, goal is to move the rest of the crap in this file into this one section)
		(function () {
			var routes = ['account'],
				loginRequired = ['notifications'];

			async.each(routes.concat(loginRequired), function(route, next) {
				app.get('/' + route, function (req, res) {

					if ((route === 'register' || route === 'login') && (req.user && req.user.uid > 0)) {
						user.getUserField(req.user.uid, 'userslug', function (err, userslug) {
							res.redirect('/user/' + userslug);
						});
						return;
					} else if(route === 'register' && meta.config.allowRegistration !== undefined && parseInt(meta.config.allowRegistration, 10) === 0) {
						return res.redirect('/403');
					} else if (loginRequired.indexOf(route) !== -1 && !req.user) {
						return res.redirect('/403');
					}

					app.build_header({
						req: req,
						res: res
					}, function (err, header) {
						res.send((isNaN(parseInt(route, 10)) ? 200 : parseInt(route, 10)), header + app.create_route(route) + templates.footer);
					});
				});
			});
		}());

		/* Main */
		app.get('/', app.buildHeader, controllers.home);
		app.get('/api/home', app.prepareAPI, controllers.home);

		app.get('/login', app.buildHeader, controllers.login);
		app.get('/api/login', app.prepareAPI, controllers.login);

		app.get('/register', app.buildHeader, controllers.register);
		app.get('/api/register', app.prepareAPI, controllers.register);

		app.get('/confirm/:code', app.buildHeader, controllers.confirmEmail);
		app.get('/api/confirm/:code', app.prepareAPI, controllers.confirmEmail);

		app.get('/sitemap.xml', controllers.sitemap);
		app.get('/robots.txt', controllers.robots);

		app.get('/outgoing', app.buildHeader, controllers.outgoing);
		app.get('/api/outgoing', app.prepareAPI, controllers.outgoing);

		/* Static Pages */
		app.get('/404', app.buildHeader, controllers.static['404']);
		app.get('/api/404', app.prepareAPI, controllers.static['404']);

		app.get('/403', app.buildHeader, controllers.static['403']);
		app.get('/api/403', app.prepareAPI, controllers.static['403']);

		app.get('/500', app.buildHeader, controllers.static['500']);
		app.get('/api/500', app.prepareAPI, controllers.static['500']);

		/* Topics */
		app.get('/topic/:topic_id/:slug?', app.buildHeader, controllers.topics.get);
		app.get('/api/topic/:topic_id/:slug?', app.prepareAPI, controllers.topics.get);

		/* Categories */
		app.get('/popular/:set?', app.buildHeader, controllers.categories.popular);
		app.get('/api/popular/:set?', app.prepareAPI, controllers.categories.popular);

		app.get('/recent/:term?', app.buildHeader, controllers.categories.recent);
		app.get('/api/recent/:term?', app.prepareAPI, controllers.categories.recent);

		app.get('/unread/', app.buildHeader, app.authenticate, controllers.categories.unread);
		app.get('/api/unread/', app.prepareAPI, app.authenticate, controllers.categories.unread);

		app.get('/unread/total', app.buildHeader, app.authenticate, controllers.categories.unreadTotal);
		app.get('/api/unread/total', app.prepareAPI, app.authenticate, controllers.categories.unreadTotal);

		app.get('/category/:category_id/:slug?', app.buildHeader, controllers.categories.get);
		app.get('/api/category/:category_id/:slug?', app.prepareAPI, controllers.categories.get);

		/* Accounts */
		app.get'/user/:userslug', app.buildHeader, app.checkGlobalPrivacySettings, controllers.accounts.getAccount);
		app.get'/api/user/:userslug', app.prepareAPI, app.checkGlobalPrivacySettings controllers.accounts.getAccount);

		app.get'/user/:userslug/following', app.buildHeader, app.checkGlobalPrivacySettings, controllers.accounts.getFollowing);
		app.get'/api/user/:userslug/following', app.prepareAPI, app.checkGlobalPrivacySettings controllers.accounts.getFollowing);

		app.get'/user/:userslug/followers', app.buildHeader, app.checkGlobalPrivacySettings, controllers.accounts.getFollowers);
		app.get'/api/user/:userslug/followers', app.prepareAPI, app.checkGlobalPrivacySettings controllers.accounts.getFollowers);

		app.get'/user/:userslug/favourites', app.buildHeader, app.checkGlobalPrivacySettings, controllers.accounts.getFavourites);
		app.get'/api/user/:userslug/favourites', app.prepareAPI, app.checkGlobalPrivacySettings controllers.accounts.getFavourites);

		app.get'/user/:userslug/posts', app.buildHeader, app.checkGlobalPrivacySettings, controllers.accounts.getPosts);
		app.get'/api/user/:userslug/posts', app.prepareAPI, app.checkGlobalPrivacySettings controllers.accounts.getPosts);

		app.get'/user/:userslug/edit', app.buildHeader, app.checkGlobalPrivacySettings, controllers.accounts.accountEdit);
		app.get'/api/user/:userslug/edit', app.prepareAPI, app.checkGlobalPrivacySettings controllers.accounts.accountEdit);

		app.get'/user/:userslug/settings', app.buildHeader, app.checkGlobalPrivacySettings, controllers.accounts.accountSettings);
		app.get'/api/user/:userslug/settings', app.prepareAPI, app.checkGlobalPrivacySettings controllers.accounts.accountSettings);





		app.get('/search/:term?', function (req, res) {

			if (!req.user && meta.config.allowGuestSearching !== '1') {
				return res.redirect('/403');
			}
			if(!req.params.term) {
				req.params.term = '';
			}
			app.build_header({
				req: req,
				res: res
			}, function (err, header) {
				res.send(header + app.create_route('search/' + req.params.term, null, 'search') + templates.footer);
			});
		});

		// Other routes
		require('./routes/plugins')(app);

		// Debug routes
		if (process.env.NODE_ENV === 'development') {
			require('./routes/debug')(app);
		}

		var custom_routes = {
			'routes': [],
			'api': [],
			'templates': []
		};

		app.get_custom_templates = function() {
			return custom_routes.templates.map(function(tpl) {
				return tpl.template.split('.tpl')[0];
			});
		};

		plugins.ready(function() {
			plugins.fireHook('filter:server.create_routes', custom_routes, function(err, custom_routes) {
				var routes = custom_routes.routes;
				for (var route in routes) {
					if (routes.hasOwnProperty(route)) {
						(function(route) {
							app[routes[route].method || 'get'](routes[route].route, function(req, res) {
								routes[route].options(req, res, function(options) {
									app.build_header({
										req: options.req || req,
										res: options.res || res
									}, function (err, header) {
										res.send(header + options.content + templates.footer);
									});
								});
							});
						}(route));
					}
				}

				var apiRoutes = custom_routes.api;
				for (var route in apiRoutes) {
					if (apiRoutes.hasOwnProperty(route)) {
						(function(route) {
							app[apiRoutes[route].method || 'get']('/api' + apiRoutes[route].route, function(req, res) {
								apiRoutes[route].callback(req, res, function(data) {
									res.json(data);
								});
							});
						}(route));
					}
				}

				var templateRoutes = custom_routes.templates;
				for (var route in templateRoutes) {
					if (templateRoutes.hasOwnProperty(route)) {
						(function(route) {
							app.get('/templates/' + templateRoutes[route].template, function(req, res) {
								res.send(templateRoutes[route].content);
							});
						}(route));
					}
				}

			});
		});


	});
}(WebServer));