var async = require('async'),
	utils = require('../public/src/utils.js'),
	fs = require('fs'),
	url = require('url'),
	path = require('path'),
	prompt = require('prompt'),
	winston = require('winston'),
	reds = require('reds'),
	nconf = require('nconf'),

	install = {
		questions: [{
			name: 'base_url',
			description: 'URL of this installation',
			'default': 'http://localhost',
			pattern: /^http(?:s)?:\/\//,
			message: 'Base URL must begin with \'http://\' or \'https://\'',
		}, {
			name: 'port',
			description: 'Port number of your NodeBB',
			'default': 4567,
            pattern: /[0-9]{1,4}|[1-5][0-9]{4}|6[0-4][0-9]{3}|65[0-4][0-9]{2}|655[0-2][0-9]|6553[0-5]/,
            message: 'Please enter a value betweeen 1 and 65535'
		}, {
			name: 'use_port',
			description: 'Use a port number to access NodeBB?',
			'default': 'y',
			pattern: /y[es]*|n[o]?/,
			message: 'Please enter \'yes\' or \'no\'',
		}, {
			name: 'secret',
			description: 'Please enter a NodeBB secret',
			'default': utils.generateUUID()
		}, {
			name: 'redis:host',
			description: 'Host IP or address of your Redis instance',
			'default': '127.0.0.1'
		}, {
			name: 'redis:port',
			description: 'Host port of your Redis instance',
			'default': 6379
		}, {
			name: 'redis:password',
			description: 'Password of your Redis database'
		}, {
			name: "redis:database",
			description: "Which database to use (0..n)",
			'default': 0
		}, {
			name: 'bind_address',
			description: 'IP or Hostname to bind to',
			'default': '0.0.0.0'
		}],
		setup: function (callback) {
			async.series([
				function(next) {
					// Check if the `--setup` flag contained values we can work with
					var	setupVal;
					try {
						setupVal = JSON.parse(nconf.get('setup'));
					} catch (e) {
						setupVal = undefined;
					}

					if (setupVal && setupVal instanceof Object) {
						if (setupVal['admin:username'] && setupVal['admin:password'] && setupVal['admin:email']) {
							install.values = setupVal;
							next();
						} else {
							winston.error('Required values are missing for automated setup:');
							if (!setupVal['admin:username']) winston.error('  admin:username');
							if (!setupVal['admin:password']) winston.error('  admin:password');
							if (!setupVal['admin:email']) winston.error('  admin:email');
							process.exit();
						}
					} else next();
				},
				function (next) {
					var	success = function(err, config) {
						if (!config) {
							return next(new Error('aborted'));
						}

						// Translate redis properties into redis object
						config.redis = {
							host: config['redis:host'],
							port: config['redis:port'],
							password: config['redis:password'],
							database: config['redis:database']
						};
						delete config['redis:host'];
						delete config['redis:port'];
						delete config['redis:password'];
						delete config['redis:database'];

						// Add hardcoded values
						config.bcrypt_rounds = 12;
						config.upload_path = '/public/uploads';
						config.use_port = (config.use_port.slice(0, 1) === 'y') ? true : false;

						var urlObject = url.parse(config.base_url),
							relative_path = (urlObject.pathname && urlObject.pathname.length > 1) ? urlObject.pathname : '',
							host = urlObject.host,
							protocol = urlObject.protocol,
							server_conf = config,
							client_conf = {
								relative_path: relative_path
							};

						server_conf.base_url = protocol + '//' + host;
						server_conf.relative_path = relative_path;

						install.save(server_conf, client_conf, next);
					};

					// prompt prepends "prompt: " to questions, let's clear that.
					prompt.start();
					prompt.message = '';
					prompt.delimiter = '';

					if (!install.values) prompt.get(install.questions, success);
					else {
						// Use provided values, fall back to defaults
						var	config = {},
							question, x, numQ;
						for(x=0,numQ=install.questions.length;x<numQ;x++) {
							question = install.questions[x];
							config[question.name] = install.values[question.name] || question['default'] || '';
						}
						success(null, config);
					}
				},
				function (next) {
					// Applying default database configs
					winston.info('Populating database with default configs, if not already set...');
					var meta = require('./meta'),
						defaults = [{
							field: 'postDelay',
							value: 10000
						}, {
							field: 'minimumPostLength',
							value: 8
						}, {
							field: 'minimumTitleLength',
							value: 3
						}, {
							field: 'minimumUsernameLength',
							value: 2
						}, {
							field: 'maximumUsernameLength',
							value: 16
						}, {
							field: 'minimumPasswordLength',
							value: 6
						}, {
							field: 'imgurClientID',
							value: ''
						}, {
							field: 'maximumProfileImageSize',
							value: 256
						}, {
							field: 'theme:type',
							value: 'local'
						}, {
							field: 'theme:id',
							value: 'nodebb-theme-cerulean'
						}];

					async.each(defaults, function (configObj, next) {
						meta.configs.setOnEmpty(configObj.field, configObj.value, next);
					}, function (err) {
						meta.configs.init(next);
					});
				},
				function (next) {
					// Check if an administrator needs to be created
					var Groups = require('./groups');

					Groups.getGidFromName('Administrators', function (err, gid) {
						if (err) {
							return next(err.message);
						}

						if (gid) {
							Groups.get(gid, {}, function (err, groupObj) {
								if (groupObj.count > 0) {
									winston.info('Administrator found, skipping Admin setup');
									next();
								} else {
									install.createAdmin(next);
								}
							});
						} else {
							install.createAdmin(next);
						}
					});
				},
				function (next) {
					// Categories
					var Categories = require('./categories'),
						admin = {
							categories: require('./admin/categories')
						};

					Categories.getAllCategories(function (data) {
						if (data.categories.length === 0) {
							winston.warn('No categories found, populating instance with default categories');

							fs.readFile(path.join(__dirname, '../', 'install/data/categories.json'), function (err, default_categories) {
								default_categories = JSON.parse(default_categories);

								async.eachSeries(default_categories, function (category, next) {
									admin.categories.create(category, next);
								}, function (err) {
									if (!err) {
										next();
									} else {
										winston.error('Could not set up categories');
									}
								});
							});
						} else {
							winston.info('Categories OK. Found ' + data.categories.length + ' categories.');
							next();
						}
					});
				},
				function (next) {
					// Default plugins
					var Plugins = require('./plugins');

					winston.info('Enabling default plugins');

					var defaultEnabled = [
						'nodebb-plugin-markdown', 'nodebb-plugin-mentions'
					];

					async.each(defaultEnabled, function (pluginId, next) {
						Plugins.isActive(pluginId, function (err, active) {
							if (!active) {
								Plugins.toggleActive(pluginId, function () {
									next();
								});
							} else {
								next();
							}
						});
					}, next);
				}
			], function (err) {
				if (err) {
					winston.warn('NodeBB Setup Aborted.');
					process.exit();
				} else {
					callback();
				}
			});
		},
		createAdmin: function (callback) {
			var User = require('./user'),
				Groups = require('./groups');

			winston.warn('No administrators have been detected, running initial user setup');
			var questions = [{
					name: 'username',
					description: 'Administrator username',
					required: true,
					type: 'string'
				}, {
					name: 'email',
					description: 'Administrator email address',
					pattern: /.+@.+/,
					required: true
				}, {
					name: 'password',
					description: 'Password',
					required: true,
					hidden: true,
					type: 'string'
				}],
				success = function(err, results) {
					if (!results) {
						return callback(new Error('aborted'));
					}

					nconf.set('bcrypt_rounds', 12);
					User.create(results.username, results.password, results.email, function (err, uid) {
						if (err) {
							winston.warn(err.message + ' Please try again.');
							return callback(new Error('invalid-values'));
						}

						Groups.getGidFromName('Administrators', function (err, gid) {
							if (gid) {
								Groups.join(gid, uid, callback);
							} else {
								Groups.create('Administrators', 'Forum Administrators', function (err, groupObj) {
									Groups.join(groupObj.gid, uid, callback);
								});
							}
						});
					});
				};

			if (!install.values) prompt.get(questions, success);
			else {
				var results = {
						username: install.values['admin:username'],
						email: install.values['admin:email'],
						password: install.values['admin:password']
					};

				success(null, results);
			}
		},
		save: function (server_conf, client_conf, callback) {
			// Server Config
			async.parallel([
				function (next) {
					fs.writeFile(path.join(__dirname, '../', 'config.json'), JSON.stringify(server_conf, null, 4), function (err) {
						next(err);
					});
				},
				function (next) {
					fs.writeFile(path.join(__dirname, '../', 'public', 'config.json'), JSON.stringify(client_conf, null, 4), function (err) {
						next(err);
					});
				}
			], function (err) {
				winston.info('Configuration Saved OK');

				nconf.file({
					file: path.join(__dirname, '..', 'config.json')
				});

				var RDB = require('./redis');
				reds.createClient = function () {
					return reds.client || (reds.client = RDB);
				};

				callback(err);
			});
		}
	};

module.exports = install;