<?php

namespace Zotlabs\Lib;


class Config {

	/**
	 * @brief Loads the hub's configuration from database to a cached storage.
	 *
	 * Retrieve a category ($family) of config variables from database to a cached
	 * storage in the global App::$config[$family].
	 *
	 * @param string $family
	 *  The category of the configuration value
	 */
	static public function Load($family) {
		if(! array_key_exists($family, \App::$config))
			\App::$config[$family] = array();

		if(! array_key_exists('config_loaded', \App::$config[$family])) {
			$r = q("SELECT * FROM config WHERE cat = '%s'", dbesc($family));
			if($r !== false) {
				if($r) {
					foreach($r as $rr) {
						$k = $rr['k'];
						\App::$config[$family][$k] = $rr['v'];
					}
				}
				\App::$config[$family]['config_loaded'] = true;
			}
		}
	}

	/**
	 * @brief Sets a configuration value for the hub.
	 *
	 * Stores a config value ($value) in the category ($family) under the key ($key).
	 *
	 * @param string $family
	 *  The category of the configuration value
	 * @param string $key
	 *  The configuration key to set
	 * @param mixed $value
	 *  The value to store in the configuration
	 * @return mixed
	 *  Return the set value, or false if the database update failed
	 */
	static public function Set($family, $key, $value) {
		// manage array value
		$dbvalue = ((is_array($value))  ? serialize($value) : $value);
		$dbvalue = ((is_bool($dbvalue)) ? intval($dbvalue)  : $dbvalue);

		if(self::Get($family, $key) === false || (! self::get_from_storage($family, $key))) {
			$ret = q("INSERT INTO config ( cat, k, v ) VALUES ( '%s', '%s', '%s' ) ",
				dbesc($family),
				dbesc($key),
				dbesc($dbvalue)
			);
			if($ret) {
				\App::$config[$family][$key] = $value;
				$ret = $value;
			}
			return $ret;
		}

		$ret = q("UPDATE config SET v = '%s' WHERE cat = '%s' AND k = '%s'",
			dbesc($dbvalue),
			dbesc($family),
			dbesc($key)
		);

		if($ret) {
			\App::$config[$family][$key] = $value;
			$ret = $value;
		}

		return $ret;
	}

	/**
	 * @brief Get a particular config variable given the category name ($family)
	 * and a key.
	 *
	 * Get a particular config variable from the given category ($family) and the
	 * $key from a cached storage in App::$config[$family]. If a key is found in the
	 * DB but does not exist in local config cache, pull it into the cache so we
	 * do not have to hit the DB again for this item.
	 *
	 * Returns false if not set.
	 *
	 * @param string $family
	 *  The category of the configuration value
	 * @param string $key
	 *  The configuration key to query
	 * @param string $default (optional) default false
	 * @return mixed Return value or false on error or if not set
	 */
	static public function Get($family, $key, $default = false) {
		if((! array_key_exists($family, \App::$config)) || (! array_key_exists('config_loaded', \App::$config[$family])))
			self::Load($family);

		if(array_key_exists('config_loaded', \App::$config[$family])) {
			if(! array_key_exists($key, \App::$config[$family])) {
				return $default;
			}
			return ((! is_array(\App::$config[$family][$key])) && (preg_match('|^a:[0-9]+:{.*}$|s', \App::$config[$family][$key]))
				? unserialize(\App::$config[$family][$key])
				: \App::$config[$family][$key]
			);
		}

		return $default;
	}

	/**
	 * @brief Deletes the given key from the hub's configuration database.
	 *
	 * Removes the configured value from the stored cache in App::$config[$family]
	 * and removes it from the database.
	 *
	 * @param string $family
	 *  The category of the configuration value
	 * @param string $key
	 *  The configuration key to delete
	 * @return mixed
	 */
	static public function Delete($family, $key) {

		$ret = false;

		if(array_key_exists($family, \App::$config) && array_key_exists($key, \App::$config[$family]))
			unset(\App::$config[$family][$key]);

		$ret = q("DELETE FROM config WHERE cat = '%s' AND k = '%s'",
			dbesc($family),
			dbesc($key)
		);

		return $ret;
	}


	/**
	 * @brief Returns a record directly from the database configuration storage.
	 *
	 * This function queries directly the database and bypasses the cached storage
	 * from get_config($family, $key).
	 *
	 * @param string $family
	 *  The category of the configuration value
	 * @param string $key
	 *  The configuration key to query
	 * @return mixed
	 */
	static private function get_from_storage($family,$key) {
		$ret = q("SELECT * FROM config WHERE cat = '%s' AND k = '%s' LIMIT 1",
			dbesc($family),
			dbesc($key)
		);

		return $ret;
	}

}
