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<?php

/**

 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)

 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 *

 * Licensed under The MIT License

 * For full copyright and license information, please see the LICENSE.txt

 * Redistributions of files must retain the above copyright notice.

 *

 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 * @link          http://cakephp.org CakePHP(tm) Project

 * @package       Cake.Core

 * @since         CakePHP(tm) v 1.0.0.2363

 * @license       http://www.opensource.org/licenses/mit-license.php MIT License

 */

App::uses('Hash', 'Utility');

App::uses('ConfigReaderInterface', 'Configure');

/**

 * Compatibility with 2.1, which expects Configure to load Set.

 */

App::uses('Set', 'Utility');

/**

 * Configuration class. Used for managing runtime configuration information.

 *

 * Provides features for reading and writing to the runtime configuration, as well

 * as methods for loading additional configuration files or storing runtime configuration

 * for future use.

 *

 * @package       Cake.Core

 * @link          http://book.cakephp.org/2.0/en/development/configuration.html#configure-class

 */

class Configure {

/**

 * Array of values currently stored in Configure.

 *

 * @var array

 */

	protected static $_values = array(

		'debug' => 0

	);

/**

 * Configured reader classes, used to load config files from resources

 *

 * @var array

 * @see Configure::load()

 */

	protected static $_readers = array();

/**

 * Initializes configure and runs the bootstrap process.

 * Bootstrapping includes the following steps:

 *

 * - Setup App array in Configure.

 * - Include app/Config/core.php.

 * - Configure core cache configurations.

 * - Load App cache files.

 * - Include app/Config/bootstrap.php.

 * - Setup error/exception handlers.

 *

 * @param bool $boot Whether to do bootstrapping.

 * @return void

 */

	public static function bootstrap($boot = true) {

		if ($boot) {

			static::_appDefaults();

			if (!include APP . 'Config' . DS . 'core.php') {

				trigger_error(__d('cake_dev',

						"Can't find application core file. Please create %s, and make sure it is readable by PHP.",

						APP . 'Config' . DS . 'core.php'),

					E_USER_ERROR

				);

			}

			App::init();

			App::$bootstrapping = false;

			App::build();

			$exception = array(

				'handler' => 'ErrorHandler::handleException',

			);

			$error = array(

				'handler' => 'ErrorHandler::handleError',

				'level' => E_ALL & ~E_DEPRECATED,

			);

			static::_setErrorHandlers($error, $exception);

			if (!include APP . 'Config' . DS . 'bootstrap.php') {

				trigger_error(__d('cake_dev',

						"Can't find application bootstrap file. Please create %s, and make sure it is readable by PHP.",

						APP . 'Config' . DS . 'bootstrap.php'),

					E_USER_ERROR

				);

			}

			restore_error_handler();

			static::_setErrorHandlers(

				static::$_values['Error'],

				static::$_values['Exception']

			);

			// Preload Debugger + CakeText in case of E_STRICT errors when loading files.

			if (static::$_values['debug'] > 0) {

				class_exists('Debugger');

				class_exists('CakeText');

			}

		}

	}

/**

 * Set app's default configs

 *

 * @return void

 */

	protected static function _appDefaults() {

		static::write('App', (array)static::read('App') + array(

			'base' => false,

			'baseUrl' => false,

			'dir' => APP_DIR,

			'webroot' => WEBROOT_DIR,

			'www_root' => WWW_ROOT

		));

	}

/**

 * Used to store a dynamic variable in Configure.

 *

 * Usage:

 * ```

 * Configure::write('One.key1', 'value of the Configure::One[key1]');

 * Configure::write(array('One.key1' => 'value of the Configure::One[key1]'));

 * Configure::write('One', array(

 *     'key1' => 'value of the Configure::One[key1]',

 *     'key2' => 'value of the Configure::One[key2]'

 * );

 *

 * Configure::write(array(

 *     'One.key1' => 'value of the Configure::One[key1]',

 *     'One.key2' => 'value of the Configure::One[key2]'

 * ));

 * ```

 *

 * @param string|array $config The key to write, can be a dot notation value.

 * Alternatively can be an array containing key(s) and value(s).

 * @param mixed $value Value to set for var

 * @return bool True if write was successful

 * @link http://book.cakephp.org/2.0/en/development/configuration.html#Configure::write

 */

	public static function write($config, $value = null) {

		if (!is_array($config)) {

			$config = array($config => $value);

		}

		foreach ($config as $name => $value) {

			static::$_values = Hash::insert(static::$_values, $name, $value);

		}

		if (isset($config['debug']) && function_exists('ini_set')) {

			if (static::$_values['debug']) {

				ini_set('display_errors', 1);

			} else {

				ini_set('display_errors', 0);

			}

		}

		return true;

	}

/**

 * Used to read information stored in Configure. It's not

 * possible to store `null` values in Configure.

 *

 * Usage:

 * ```

 * Configure::read('Name'); will return all values for Name

 * Configure::read('Name.key'); will return only the value of Configure::Name[key]

 * ```

 *

 * @param string|null $var Variable to obtain. Use '.' to access array elements.

 * @return mixed value stored in configure, or null.

 * @link http://book.cakephp.org/2.0/en/development/configuration.html#Configure::read

 */

	public static function read($var = null) {

		if ($var === null) {

			return static::$_values;

		}

		return Hash::get(static::$_values, $var);

	}

/**

 * Used to read and delete a variable from Configure.

 *

 * This is primarily used during bootstrapping to move configuration data

 * out of configure into the various other classes in CakePHP.

 *

 * @param string $var The key to read and remove.

 * @return array|null

 */

	public static function consume($var) {

		$simple = strpos($var, '.') === false;

		if ($simple && !isset(static::$_values[$var])) {

			return null;

		}

		if ($simple) {

			$value = static::$_values[$var];

			unset(static::$_values[$var]);

			return $value;

		}

		$value = Hash::get(static::$_values, $var);

		static::$_values = Hash::remove(static::$_values, $var);

		return $value;

	}

/**

 * Returns true if given variable is set in Configure.

 *

 * @param string $var Variable name to check for

 * @return bool True if variable is there

 */

	public static function check($var) {

		if (empty($var)) {

			return false;

		}

		return Hash::get(static::$_values, $var) !== null;

	}

/**

 * Used to delete a variable from Configure.

 *

 * Usage:

 * ```

 * Configure::delete('Name'); will delete the entire Configure::Name

 * Configure::delete('Name.key'); will delete only the Configure::Name[key]

 * ```

 *

 * @param string $var the var to be deleted

 * @return void

 * @link http://book.cakephp.org/2.0/en/development/configuration.html#Configure::delete

 */

	public static function delete($var) {

		static::$_values = Hash::remove(static::$_values, $var);

	}

/**

 * Add a new reader to Configure. Readers allow you to read configuration

 * files in various formats/storage locations. CakePHP comes with two built-in readers

 * PhpReader and IniReader. You can also implement your own reader classes in your application.

 *

 * To add a new reader to Configure:

 *

 * `Configure::config('ini', new IniReader());`

 *

 * @param string $name The name of the reader being configured. This alias is used later to

 *   read values from a specific reader.

 * @param ConfigReaderInterface $reader The reader to append.

 * @return void

 */

	public static function config($name, ConfigReaderInterface $reader) {

		static::$_readers[$name] = $reader;

	}

/**

 * Gets the names of the configured reader objects.

 *

 * @param string|null $name Name to check. If null returns all configured reader names.

 * @return array Array of the configured reader objects.

 */

	public static function configured($name = null) {

		if ($name) {

			return isset(static::$_readers[$name]);

		}

		return array_keys(static::$_readers);

	}

/**

 * Remove a configured reader. This will unset the reader

 * and make any future attempts to use it cause an Exception.

 *

 * @param string $name Name of the reader to drop.

 * @return bool Success

 */

	public static function drop($name) {

		if (!isset(static::$_readers[$name])) {

			return false;

		}

		unset(static::$_readers[$name]);

		return true;

	}

/**

 * Loads stored configuration information from a resource. You can add

 * config file resource readers with `Configure::config()`.

 *

 * Loaded configuration information will be merged with the current

 * runtime configuration. You can load configuration files from plugins

 * by preceding the filename with the plugin name.

 *

 * `Configure::load('Users.user', 'default')`

 *

 * Would load the 'user' config file using the default config reader. You can load

 * app config files by giving the name of the resource you want loaded.

 *

 * `Configure::load('setup', 'default');`

 *

 * If using `default` config and no reader has been configured for it yet,

 * one will be automatically created using PhpReader

 *

 * @param string $key name of configuration resource to load.

 * @param string $config Name of the configured reader to use to read the resource identified by $key.

 * @param bool $merge if config files should be merged instead of simply overridden

 * @return bool False if file not found, true if load successful.

 * @throws ConfigureException Will throw any exceptions the reader raises.

 * @link http://book.cakephp.org/2.0/en/development/configuration.html#Configure::load

 */

	public static function load($key, $config = 'default', $merge = true) {

		$reader = static::_getReader($config);

		if (!$reader) {

			return false;

		}

		$values = $reader->read($key);

		if ($merge) {

			$keys = array_keys($values);

			foreach ($keys as $key) {

				if (($c = static::read($key)) && is_array($values[$key]) && is_array($c)) {

					$values[$key] = Hash::merge($c, $values[$key]);

				}

			}

		}

		return static::write($values);

	}

/**

 * Dump data currently in Configure into $key. The serialization format

 * is decided by the config reader attached as $config. For example, if the

 * 'default' adapter is a PhpReader, the generated file will be a PHP

 * configuration file loadable by the PhpReader.

 *

 * ## Usage

 *

 * Given that the 'default' reader is an instance of PhpReader.

 * Save all data in Configure to the file `my_config.php`:

 *

 * `Configure::dump('my_config.php', 'default');`

 *

 * Save only the error handling configuration:

 *

 * `Configure::dump('error.php', 'default', array('Error', 'Exception');`

 *

 * @param string $key The identifier to create in the config adapter.

 *   This could be a filename or a cache key depending on the adapter being used.

 * @param string $config The name of the configured adapter to dump data with.

 * @param array $keys The name of the top-level keys you want to dump.

 *   This allows you save only some data stored in Configure.

 * @return bool success

 * @throws ConfigureException if the adapter does not implement a `dump` method.

 */

	public static function dump($key, $config = 'default', $keys = array()) {

		$reader = static::_getReader($config);

		if (!$reader) {

			throw new ConfigureException(__d('cake_dev', 'There is no "%s" adapter.', $config));

		}

		if (!method_exists($reader, 'dump')) {

			throw new ConfigureException(__d('cake_dev', 'The "%s" adapter, does not have a %s method.', $config, 'dump()'));

		}

		$values = static::$_values;

		if (!empty($keys) && is_array($keys)) {

			$values = array_intersect_key($values, array_flip($keys));

		}

		return (bool)$reader->dump($key, $values);

	}

/**

 * Get the configured reader. Internally used by `Configure::load()` and `Configure::dump()`

 * Will create new PhpReader for default if not configured yet.

 *

 * @param string $config The name of the configured adapter

 * @return mixed Reader instance or false

 */

	protected static function _getReader($config) {

		if (!isset(static::$_readers[$config])) {

			if ($config !== 'default') {

				return false;

			}

			App::uses('PhpReader', 'Configure');

			static::config($config, new PhpReader());

		}

		return static::$_readers[$config];

	}

/**

 * Used to determine the current version of CakePHP.

 *

 * Usage `Configure::version();`

 *

 * @return string Current version of CakePHP

 */

	public static function version() {

		if (!isset(static::$_values['Cake']['version'])) {

			require CAKE . 'Config' . DS . 'config.php';

			static::write($config);

		}

		return static::$_values['Cake']['version'];

	}

/**

 * Used to write runtime configuration into Cache. Stored runtime configuration can be

 * restored using `Configure::restore()`. These methods can be used to enable configuration managers

 * frontends, or other GUI type interfaces for configuration.

 *

 * @param string $name The storage name for the saved configuration.

 * @param string $cacheConfig The cache configuration to save into. Defaults to 'default'

 * @param array $data Either an array of data to store, or leave empty to store all values.

 * @return bool Success

 */

	public static function store($name, $cacheConfig = 'default', $data = null) {

		if ($data === null) {

			$data = static::$_values;

		}

		return Cache::write($name, $data, $cacheConfig);

	}

/**

 * Restores configuration data stored in the Cache into configure. Restored

 * values will overwrite existing ones.

 *

 * @param string $name Name of the stored config file to load.

 * @param string $cacheConfig Name of the Cache configuration to read from.

 * @return bool Success.

 */

	public static function restore($name, $cacheConfig = 'default') {

		$values = Cache::read($name, $cacheConfig);

		if ($values) {

			return static::write($values);

		}

		return false;

	}

/**

 * Clear all values stored in Configure.

 *

 * @return bool Success.

 */

	public static function clear() {

		static::$_values = array();

		return true;

	}

/**

 * Set the error and exception handlers.

 *

 * @param array $error The Error handling configuration.

 * @param array $exception The exception handling configuration.

 * @return void

 */

	protected static function _setErrorHandlers($error, $exception) {

		$level = -1;

		if (isset($error['level'])) {

			error_reporting($error['level']);

			$level = $error['level'];

		}

		if (!empty($error['handler'])) {

			set_error_handler($error['handler'], $level);

		}

		if (!empty($exception['handler'])) {

			set_exception_handler($exception['handler']);

		}

	}

}