var utils = require('./../public/src/utils.js'),
	RDB = require('./redis.js'),
	plugins = require('./plugins'),
	async = require('async'),
	path = require('path'),
	fs = require('fs'),
	winston = require('winston'),
	nconf = require('nconf');

(function (Meta) {
	Meta.config = {};

	Meta.configs = {
		init: function (callback) {
			delete Meta.config;

			Meta.configs.list(function (err, config) {
				if (!err) {
					Meta.config = config;
					callback();
				} else {
					winston.error(err);
				}
			});
		},
		list: function (callback) {
			RDB.hgetall('config', function (err, config) {
				if (!err) {
					config = config || {};
					config.status = 'ok';
					callback(err, config);
				} else {
					callback(new Error('could-not-read-config'));
				}
			});
		},
		get: function (field, callback) {
			RDB.hget('config', field, callback);
		},
		getFields: function (fields, callback) {
			RDB.hmgetObject('config', fields, callback);
		},
		set: function (field, value, callback) {
			RDB.hset('config', field, value, function (err, res) {
				if (callback) {
					if(!err && Meta.config)
						Meta.config[field] = value;
					callback(err, res);
				}
			});
		},
		setOnEmpty: function (field, value, callback) {
			this.get(field, function (err, curValue) {
				if (!curValue) {
					Meta.configs.set(field, value, callback);
				} else {
					callback();
				}
			});
		},
		remove: function (field) {
			RDB.hdel('config', field);
		}
	};

	Meta.themes = {
		get: function (callback) {
			var themePath = path.join(__dirname, '../node_modules');
			fs.readdir(themePath, function (err, files) {
				async.filter(files, function (file, next) {
					fs.stat(path.join(themePath, file), function (err, fileStat) {
						if (err) {
							next(false);
						}

						next((fileStat.isDirectory() && file.slice(0, 13) === 'nodebb-theme-'));
					});
				}, function (themes) {
					async.map(themes, function (theme, next) {
						var config = path.join(themePath, theme, 'theme.json');

						if (fs.existsSync(config)) {
							fs.readFile(config, function (err, file) {
								if (err) return next();
								else {
									var configObj = JSON.parse(file.toString());
									next(err, configObj);
								}
							});
						} else {
							next();
						}
					}, function (err, themes) {
						themes = themes.filter(function (theme) {
							return (theme !== undefined);
						});
						callback(null, themes);
					});
				});
			});
		},
		set: function(data, callback) {
			var	themeData = {
					'theme:type': data.type,
					'theme:id': data.id,
					'theme:staticDir': '',
					'theme:templates': '',
					'theme:src': ''
				};

			switch(data.type) {
				case 'local':
					async.waterfall([
						function(next) {
							fs.readFile(path.join(__dirname, '../node_modules', data.id, 'theme.json'), function(err, config) {
								if (!err) {
									config = JSON.parse(config.toString());
									next(null, config);
								} else {
									next(err);
								}
							});
						},
						function(config, next) {
							themeData['theme:staticDir'] = config.staticDir ? config.staticDir : '';
							themeData['theme:templates'] = config.templates ? config.templates : '';

							RDB.hmset('config', themeData, next);
						}
					], function(err) {
						callback(err);
					});
				break;

				case 'bootswatch':
					themeData['theme:src'] = data.src;
					RDB.hmset('config', themeData, callback);
				break;
			}
		}
	};

	Meta.title = {
		build: function (urlFragment, current_user, callback) {
			var self = this,
				user = require('./user');

			async.parallel({
				title: function (next) {
					self.parseFragment(urlFragment, next);
				},
				notifCount: function (next) {
					user.notifications.getUnreadCount(current_user, next);
				}
			}, function (err, values) {
				var title;

				if (err) {
					title = Meta.config.title || 'NodeBB';
				} else {
					title = (values.title ? values.title + ' | ' : '') + (Meta.config.title || 'NodeBB');
				}

				callback(null, title, values.notifCount);
			});
		},
		parseFragment: function (urlFragment, callback) {
			if (urlFragment === '') {
				callback(null, 'Index');
			} else if (urlFragment === 'recent') {
				callback(null, 'Recent Topics');
			} else if (urlFragment === 'unread') {
				callback(null, 'Unread Topics');
			} else if (urlFragment === 'users') {
				callback(null, 'Registered Users');
			} else if (/^category\/\d+\/?/.test(urlFragment)) {
				var cid = urlFragment.match(/category\/(\d+)/)[1];

				require('./categories').getCategoryField(cid, 'name', function (err, name) {
					callback(null, name);
				});
			} else if (/^topic\/\d+\/?/.test(urlFragment)) {
				var tid = urlFragment.match(/topic\/(\d+)/)[1];

				require('./topics').getTopicField(tid, 'title', function (err, title) {
					callback(null, title);
				});
			} else {
				callback(null);
			}
		}
	};

	Meta.js = {
		scripts: [
			'vendor/jquery/js/jquery.js',
			'vendor/jquery/js/jquery-ui-1.10.3.custom.min.js',
			'vendor/jquery/js/jquery.timeago.js',
			'vendor/jquery/js/jquery.form.js',
			'vendor/bootstrap/js/bootstrap.min.js',
			'src/app.js',
			'vendor/requirejs/require.js',
			'vendor/bootbox/bootbox.min.js',
			'src/templates.js',
			'src/ajaxify.js',
			'src/translator.js',
			'src/utils.js'
		],
		minFile: path.join(__dirname, '..', 'public/src/nodebb.min.js'),
		get: function (callback) {
			plugins.fireHook('filter:scripts.get', this.scripts, function(err, scripts) {
				var mtime,
					jsPaths = scripts.map(function (jsPath) {
						return path.join(__dirname, '..', '/public', jsPath);
					});

				if (process.env.NODE_ENV !== 'development') {
					async.parallel({
						mtime: function (next) {
							async.map(jsPaths, fs.stat, function (err, stats) {
								async.reduce(stats, 0, function (memo, item, callback) {
									mtime = +new Date(item.mtime);
									callback(null, mtime > memo ? mtime : memo);
								}, next);
							});
						},
						minFile: function (next) {
							if (!fs.existsSync(Meta.js.minFile)) {
								if (process.env.NODE_ENV === 'development') winston.warn('No minified client-side library found');
								return next(null, 0);
							}

							fs.stat(Meta.js.minFile, function (err, stat) {
								next(err, +new Date(stat.mtime));
							});
						}
					}, function (err, results) {
						if (results.minFile > results.mtime) {
							if (process.env.NODE_ENV === 'development') winston.info('No changes to client-side libraries -- skipping minification');
							callback(null, [path.relative(path.join(__dirname, '../public'), Meta.js.minFile)]);
						} else {
							Meta.js.minify(function () {
								callback(null, [path.relative(path.join(__dirname, '../public'), Meta.js.minFile)]);
							});
						}
					});
				} else {
					callback(null, scripts);
				}
			});
		},
		minify: function (callback) {
			var uglifyjs = require('uglify-js'),
				jsPaths = this.scripts.map(function (jsPath) {
					return path.join(__dirname, '..', '/public', jsPath);
				}),
				minified;

			if (process.env.NODE_ENV === 'development') winston.info('Minifying client-side libraries');
			minified = uglifyjs.minify(jsPaths);
			fs.writeFile(Meta.js.minFile, minified.code, function (err) {
				if (!err) {
					if (process.env.NODE_ENV === 'development') winston.info('Minified client-side libraries');
					callback();
				} else {
					winston.error('Problem minifying client-side libraries, exiting.');
					process.exit();
				}
			});
		}
	};

	Meta.db = {
		getFile: function (callback) {
			var multi = RDB.multi();

			multi.config('get', 'dir');
			multi.config('get', 'dbfilename');
			multi.exec(function (err, results) {
				if (err) {
					return callback(err);
				} else {
					results = results.reduce(function (memo, config) {
						memo[config[0]] = config[1];
						return memo;
					}, {});

					var dbFile = path.join(results.dir, results.dbfilename);
					callback(null, dbFile);
				}
			});
		}
	};
}(exports));