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/**
 * Contains the functionality for auto-loading service classes.
 */
class CFLoader
{
	/*%******************************************************************************************%*/
	// AUTO-LOADER

	/**
	 * Automatically load classes that aren't included.
	 *
	 * @param string $class (Required) The classname to load.
	 * @return boolean Whether or not the file was successfully loaded.
	 */
	public static function autoloader($class)
	{
		$path = dirname(__FILE__) . DIRECTORY_SEPARATOR;

		// Amazon SDK classes
		if (strstr($class, 'Amazon'))
		{
			if (file_exists($require_this = $path . 'services' . DIRECTORY_SEPARATOR . str_ireplace('Amazon', '', strtolower($class)) . '.class.php'))
			{
				require_once $require_this;
				return true;
			}

			return false;
		}

		// Utility classes
		elseif (strstr($class, 'CF'))
		{
			if (file_exists($require_this = $path . 'utilities' . DIRECTORY_SEPARATOR . str_ireplace('CF', '', strtolower($class)) . '.class.php'))
			{
				require_once $require_this;
				return true;
			}

			return false;
		}

		// Load CacheCore
		elseif (strstr($class, 'Cache'))
		{
			if (file_exists($require_this = $path . 'lib' . DIRECTORY_SEPARATOR . 'cachecore' . DIRECTORY_SEPARATOR . strtolower($class) . '.class.php'))
			{
				require_once $require_this;
				return true;
			}

			return false;
		}

		// Load RequestCore
		elseif (strstr($class, 'RequestCore') || strstr($class, 'ResponseCore'))
		{
			if (file_exists($require_this = $path . 'lib' . DIRECTORY_SEPARATOR . 'requestcore' . DIRECTORY_SEPARATOR . 'requestcore.class.php'))
			{
				require_once $require_this;
				return true;
			}

			return false;
		}

		// Load Authentication Signers
		elseif (strstr($class, 'Auth'))
		{
			if (file_exists($require_this = $path . 'authentication' . DIRECTORY_SEPARATOR . str_replace('auth', 'signature_', strtolower($class)) . '.class.php'))
			{
				require_once $require_this;
				return true;
			}

			return false;
		}

		// Load Signer interface
		elseif ($class === 'Signer')
		{
			if (!interface_exists('Signable', false) &&
			    file_exists($require_this = $path . 'authentication' . DIRECTORY_SEPARATOR . 'signable.interface.php'))
			{
				require_once $require_this;
			}

			if (file_exists($require_this = $path . 'authentication' . DIRECTORY_SEPARATOR . 'signer.abstract.php'))
			{
				require_once $require_this;
				return true;
			}

			return false;
		}

		// Load Symfony YAML classes
		elseif (strstr($class, 'sfYaml'))
		{
			if (file_exists($require_this = $path . 'lib' . DIRECTORY_SEPARATOR . 'yaml' . DIRECTORY_SEPARATOR . 'lib' . DIRECTORY_SEPARATOR . 'sfYaml.php'))
			{
				require_once $require_this;
				return true;
			}

			return false;
		}

		return false;
	}
}