<?php
/*
 * Copyright 2005-2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Encapsulates work with system settings.
 */
Class Settings {

	/**
	 * An instance of Settings class
	 * @var Settings
	 */
	protected static $instance = null;

	/**
	 * Array of settings
	 * @var array
	 */
	protected $settings = array();

	/**
	 * Array of settings stored in database
	 * @var array
	 */
	protected $settingsInDb = array();

	/**
	 * Returns an instance of Settings class
	 * @return Settings
	 */
	protected static function getInstance(){
		if (self::$instance === null) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Settings class constructor. Set default values and load setting from database.
	 * @global $home_locale Specifies home locale. Defined in libs/config.php
	 */
	protected function __construct() {
		global $home_locale;
		// Set default values
		$this->settings = array(
			'dbversion' => 0,
			'featuresversion' => 0,
			'title' => 'Your Company',
			'hosturl' => 'http://mibew.org',
			'logo' => '',
			'usernamepattern' => '{name}',
			'chatstyle' => 'default',
			'invitationstyle' => 'default',
			'chattitle' => 'Live Support',
			'geolink' => 'http://api.hostip.info/get_html.php?ip={ip}',
			'geolinkparams' => 'width=440,height=100,toolbar=0,scrollbars=0,location=0,status=1,menubar=0,resizable=1',
			'max_uploaded_file_size' => 100000,
			'max_connections_from_one_host' => 10,
			'thread_lifetime' => 600,

			'email' => '', /* inbox for left messages */
			'left_messages_locale' => $home_locale,
			'sendmessagekey' => 'center',

			'enableban' => '0',
			'enablessl' => '0',
			'forcessl' => '0',
			'usercanchangename' => '1',
			'enablegroups' => '0',
			'enablegroupsisolation' => '0',
			'enablestatistics' => '1',
			'enabletracking' => '0',
			'enablepresurvey' => '1',
			'surveyaskmail' => '0',
			'surveyaskgroup' => '1',
			'surveyaskmessage' => '0',
			'enablepopupnotification' => '0',
			'showonlineoperators' => '0',
			'enablecaptcha' => '0',

			'online_timeout' => 30, /* Timeout (in seconds) when online operator becomes offline */
			'updatefrequency_operator' => 2,
			'updatefrequency_chat' => 2,
			'updatefrequency_oldchat' => 7,

			'updatefrequency_tracking' => 10,
			'visitors_limit' => 20, /* Number of visitors to look over */
			'invitation_lifetime' => 60, /* Lifetime for invitation to chat */
			'tracking_lifetime' => 600, /* Time to store tracked old visitors' data */
		);

		// Load values from database
		$db = Database::getInstance();
		$rows = $db->query(
			"select vckey,vcvalue from {chatconfig}",
			NULL,
			array('return_rows' => Database::RETURN_ALL_ROWS)
		);

		foreach ($rows as $row) {
			$name = $row['vckey'];
			$this->settings[$name] = $row['vcvalue'];
			$this->settingsInDb[$name] = true;
		}
	}

	/**
	 * Get setting value.
	 *
	 * @param string $name Variable's name
	 * @return mixed
	 */
	public static function get($name) {
		$instance = self::getInstance();
		return $instance->settings[$name];
	}

	/**
	 * Set setting value.
	 *
	 * @param string $name Variables's name
	 * @param mixed $value Variable's value
	 */
	public static function set($name, $value) {
		$instance = self::getInstance();
		$instance->settings[$name] = $value;
	}

	/**
	 * Updates settings in database.
	 */
	public static function update() {
		$instance = self::getInstance();
		$db = Database::getInstance();
		foreach ($instance->settings as $key => $value) {
			if (!isset($instance->settingsInDb[$key])) {
				$db->query(
					"insert into {chatconfig} (vckey) values (?)",
					array($key)
				);
			}
			$db->query(
				"update {chatconfig} set vcvalue=? where vckey=?",
				array($value, $key)
			);
		}
	}

	/**
	 * Implementation of destructor
	 */
	public function __destruct() {}
}

?>