var path = require('path'),
	nconf = require('nconf'),
	async = require('async'),
	fs = require('fs'),

	db = require('../database'),
	user = require('../user'),
	groups = require('../groups'),
	auth = require('./authentication'),
	topics = require('../topics'),
	ThreadTools = require('../threadTools'),
	posts = require('../posts'),
	categories = require('../categories'),
	categoryTools = require('../categoryTools')
	meta = require('../meta'),
	Plugins = require('../plugins'),
	utils = require('../../public/src/utils'),
	translator = require('../../public/src/translator'),
	pkg = require('../../package.json');


(function (Api) {
	Api.createRoutes = function (app) {

		app.namespace('/api', function () {

			app.all('*', function(req, res, next) {

				if(req.user) {
					user.updateLastOnlineTime(req.user.uid);
				}

				next();
			});

			app.get('/get_templates_listing', function (req, res) {
				utils.walk(path.join(__dirname, '../../', 'public/templates'), function (err, data) {
					res.json(data.concat(app.get_custom_templates()).filter(function(value, index, self) {
						return self.indexOf(value) === index;
					}));
				});
			});

			app.get('/config', function (req, res, next) {
				var config = require('../../public/config.json');

				config.postDelay = meta.config.postDelay;
				config.minimumTitleLength = meta.config.minimumTitleLength;
				config.maximumTitleLength = meta.config.maximumTitleLength;
				config.minimumPostLength = meta.config.minimumPostLength;
				config.hasImageUploadPlugin = Plugins.hasListeners('filter:uploadImage');
				config.maximumProfileImageSize = meta.config.maximumProfileImageSize;
				config.minimumUsernameLength = meta.config.minimumUsernameLength;
				config.maximumUsernameLength = meta.config.maximumUsernameLength;
				config.minimumPasswordLength = meta.config.minimumPasswordLength;
				config.maximumSignatureLength = meta.config.maximumSignatureLength;
				config.useOutgoingLinksPage = parseInt(meta.config.useOutgoingLinksPage, 10) === 1;
				config.allowGuestPosting = parseInt(meta.config.allowGuestPosting, 10) === 1;
				config.allowFileUploads = parseInt(meta.config.allowFileUploads, 10) === 1;
				config.usePagination = parseInt(meta.config.usePagination, 10) === 1;
				config.topicsPerPage = meta.config.topicsPerPage || 20;
				config.postsPerPage = meta.config.postsPerPage || 20;
				config.maximumFileSize = meta.config.maximumFileSize;
				config.defaultLang = meta.config.defaultLang || 'en_GB';
				config.environment = process.env.NODE_ENV;

				if (!req.user) {
					return res.json(200, config);
				}

				if(req.user) {
					user.getSettings(req.user.uid, function(err, settings) {
						if(err) {
							return next(err);
						}

						config.usePagination = settings.usePagination;
						config.topicsPerPage = settings.topicsPerPage;
						config.postsPerPage = settings.postsPerPage;
						res.json(200, config);
					});
				}
			});

			app.get('/home', function (req, res) {
				var uid = (req.user) ? req.user.uid : 0;
				categories.getAllCategories(uid, function (err, data) {

					data.categories = data.categories.filter(function (category) {
						return !category.disabled;
					});

					function canSee(category, next) {
						categoryTools.privileges(category.cid, ((req.user) ? req.user.uid || 0 : 0), function(err, privileges) {
							next(!err && privileges.read);
						});
					}

					function getRecentReplies(category, callback) {
						categories.getRecentReplies(category.cid, uid, parseInt(category.numRecentReplies, 10), function (err, posts) {
							category.posts = posts;
							category.post_count = posts.length > 2 ? 2 : posts.length; // this was a hack to make metro work back in the day, post_count should just = length
							callback(null);
						});
					}

					async.filter(data.categories, canSee, function(visibleCategories) {
						data.categories = visibleCategories;

						async.each(data.categories, getRecentReplies, function (err) {
							res.json(data);
						});
					});
				});
			});

			app.get('/login', function (req, res) {
				var data = {},
					login_strategies = auth.get_login_strategies(),
					num_strategies = login_strategies.length,
					emailersPresent = Plugins.hasListeners('action:email.send');

				if (num_strategies == 0) {
					data = {
						'login_window:spansize': 'col-md-12',
						'alternate_logins': false
					};
				} else {
					data = {
						'login_window:spansize': 'col-md-6',
						'alternate_logins': true
					}
				}

				data.authentication = login_strategies;
				data.token = res.locals.csrf_token;
				data.showResetLink = emailersPresent;

				res.json(data);
			});

			app.get('/register', function (req, res) {
				var data = {},
					login_strategies = auth.get_login_strategies(),
					num_strategies = login_strategies.length;

				if (num_strategies == 0) {
					data = {
						'register_window:spansize': 'col-md-12',
						'alternate_logins': false
					};
				} else {
					data = {
						'register_window:spansize': 'col-md-6',
						'alternate_logins': true
					}
				}

				data.authentication = login_strategies;

				data.token = res.locals.csrf_token;
				data.minimumUsernameLength = meta.config.minimumUsernameLength;
				data.maximumUsernameLength = meta.config.maximumUsernameLength;
				data.minimumPasswordLength = meta.config.minimumPasswordLength;
				data.termsOfUse = meta.config.termsOfUse;
				res.json(data);
			});

			app.get('/topic/:id/:slug?', function (req, res, next) {
				var uid = (req.user) ? req.user.uid : 0;
				var page = 1;
				if(req.query && req.query.page) {
					page = req.query.page;
				}

				if(!utils.isNumber(page) || parseInt(page, 10) < 1) {
					return res.send(404);
				}

				user.getSettings(uid, function(err, settings) {
					if(err) {
						return next(err);
					}

					var start = (page - 1) * settings.postsPerPage;
					var end = start + settings.postsPerPage - 1;

					ThreadTools.privileges(req.params.id, uid, function(err, privileges) {
						if (privileges.read) {
							topics.getTopicWithPosts(req.params.id, uid, start, end, false, function (err, data) {
								if(err) {
									return next(err);
								}

								if(page > data.pageCount) {
									return res.send(404);
								}

								data.currentPage = page;
								data.privileges = privileges;

								if (parseInt(data.deleted, 10) === 1 && parseInt(data.expose_tools, 10) === 0) {
									return res.json(404, {});
								}

								res.json(data);
							});
						} else {
							res.send(403);
						}
					});
				});
			});

			app.get('/category/:id/:slug?', function (req, res, next) {
				var uid = (req.user) ? req.user.uid : 0;
				var page = 1;
				if(req.query && req.query.page) {
					page = req.query.page;
				}

				if(!utils.isNumber(page) || parseInt(page, 10) < 1) {
					return res.send(404);
				}

				user.getSettings(uid, function(err, settings) {
					if(err) {
						return next(err);
					}

					var start = (page - 1) * settings.topicsPerPage,
						end = start + settings.topicsPerPage - 1;

					categoryTools.privileges(req.params.id, uid, function(err, privileges) {
						if (!err && privileges.read) {
							categories.getCategoryById(req.params.id, start, end, uid, function (err, data) {
								if(err) {
									return next(err);
								}

								data.currentPage = page;
								data.privileges = privileges;

								if (data && !data.disabled) {
									res.json(data);
								} else {
									next();
								}
							}, req.params.id, uid);
						} else {
							res.send(403);
						}
					});
				});
			});

			app.get('/recent/:term?', function (req, res, next) {
				var uid = (req.user) ? req.user.uid : 0;
				topics.getLatestTopics(uid, 0, 19, req.params.term, function (err, data) {
					if(err) {
						return next(err);
					}

					res.json(data);
				});
			});

			app.get('/popular/:set?', function (req, res, next) {
				var uid = (req.user) ? req.user.uid : 0;
				var set = 'topics:' + req.params.set;
				if(!req.params.set) {
					set = 'topics:posts';
				}
				topics.getTopicsFromSet(uid, set, 0, 19, function(err, data) {
					if(err) {
						return next(err);
					}
					res.json(data);
				});
			});

			app.get('/unread', function (req, res, next) {
				var uid = (req.user) ? req.user.uid : 0;
				topics.getUnreadTopics(uid, 0, 19, function (err, data) {
					if(err) {
						return next(err);
					}

					res.json(data);
				});
			});

			app.get('/unread/total', function (req, res, next) {
				var uid = (req.user) ? req.user.uid : 0;
				topics.getTotalUnread(uid, function (err, data) {
					if(err) {
						return next(err);
					}

					res.json(data);
				});
			});

			app.get('/notifications', function(req, res) {
				if (req.user && req.user.uid) {
					user.notifications.getAll(req.user.uid, null, null, function(err, notifications) {
						res.json({
							notifications: notifications
						});
					});
				} else {
					res.send(403);
				}
			});

			app.get('/confirm/:id', function (req, res) {
				user.email.confirm(req.params.id, function (data) {
					if (data.status === 'ok') {
						res.json({
							'alert-class': 'alert-success',
							title: 'Email Confirmed',
							text: 'Thank you for vaidating your email. Your account is now fully activated.'
						});
					} else {
						res.json({
							'alert-class': 'alert-danger',
							title: 'An error occurred...',
							text: 'There was a problem validating your email address. Perhaps the code was invalid or has expired.'
						});
					}
				});
			});

			app.get('/outgoing', function (req, res) {
				var url = req.query.url;

				if (url) {
					res.json({
						url: url,
						title: meta.config.title
					});
				} else {
					res.status(404);
					res.redirect(nconf.get('relative_path') + '/404');
				}
			});

			app.get('/search', function (req, res) {
				if ((req.user && req.user.uid) || meta.config.allowGuestSearching === '1') {
					return res.json({
						show_no_topics: 'hide',
						show_no_posts: 'hide',
						show_results: 'hide',
						search_query: '',
						posts: [],
						topics: []
					});
				} else {
					res.send(403);
				}
			});

			app.get('/search/:term', function (req, res, next) {
				if (!Plugins.hasListeners('filter:search.query')) {
					return res.redirect('/404');
				}

				var limit = 50;

				function searchPosts(callback) {
					Plugins.fireHook('filter:search.query', {
						index: 'post',
						query: req.params.terms
					}, function(err, pids) {
						if (err) {
							return callback(err, null);
						}

						posts.getPostSummaryByPids(pids, false, callback);
					});
				}

				function searchTopics(callback) {
					Plugins.fireHook('filter:search.query', {
						index: 'topic',
						query: req.params.terms
					}, function(err, tids) {
						if (err) {
							return callback(err, null);
						}

						topics.getTopicsByTids(tids, 0, 0, callback);
					});
				}

				if ((req.user && req.user.uid) || meta.config.allowGuestSearching === '1') {
					async.parallel([searchPosts, searchTopics], function (err, results) {
						if (err) {
							return next(err);
						}

						if(!results) {
							results = [];
							results[0] = results[1] = [];
						}

						return res.json({
							show_no_topics: results[1].length ? 'hide' : '',
							show_no_posts: results[0].length ? 'hide' : '',
							show_results: '',
							search_query: req.params.term,
							posts: results[0],
							topics: results[1],
							post_matches : results[0].length,
							topic_matches : results[1].length
						});
					});
				} else {
					res.send(403);
				}
			});

			app.post('/post/upload', function(req, res, next) {
				if(!req.user) {
					return res.json(403, {message:'not allowed'});
				}
				var files = req.files.files;

				if(!Array.isArray(files)) {
					return res.json(500, {message: 'invalid files'});
				}

				// multiple files
				if(Array.isArray(files[0])) {
					files = files[0];
				}

				function deleteTempFiles() {
					for(var i=0; i<files.length; ++i) {
						fs.unlink(files[i].path);
					}
				}

				async.map(files, function(file, next) {
					if(file.type.match('image.*')) {
						posts.uploadPostImage(file, next);
					} else {
						posts.uploadPostFile(file, next);
					}
				}, function(err, images) {
					deleteTempFiles();

					if(err) {
						return res.json(500, err.message);
					}

					res.json(200, images);
				});
			});

			app.get('/reset', function (req, res) {
				res.json({});
			});

			app.get('/reset/:code', function (req, res) {
				res.json({
					reset_code: req.params.code
				});
			});

			app.get('/404', function (req, res) {
				res.json({});
			});

			app.get('/403', function (req, res) {
				res.json({});
			});

			app.get('/500', function(req, res) {
				res.json({errorMessage: 'testing'});
			});
		});
	}
}(exports));