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<?php
/**
 * CConsoleApplication class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright Copyright &copy; 2008-2011 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

/**
 * CConsoleApplication represents a console application.
 *
 * CConsoleApplication extends {@link CApplication} by providing functionalities
 * specific to console requests. In particular, it deals with console requests
 * through a command-based approach:
 * <ul>
 * <li>A console application consists of one or several possible user commands;</li>
 * <li>Each user command is implemented as a class extending {@link CConsoleCommand};</li>
 * <li>User specifies which command to run on the command line;</li>
 * <li>The command processes the user request with the specified parameters.</li>
 * </ul>
 *
 * The command classes reside in the directory {@link getCommandPath commandPath}.
 * The name of the class follows the pattern: &lt;command-name&gt;Command, and its
 * file name is the same the class name. For example, the 'ShellCommand' class defines
 * a 'shell' command and the class file name is 'ShellCommand.php'.
 *
 * To run the console application, enter the following on the command line:
 * <pre>
 * php path/to/entry_script.php <command name> [param 1] [param 2] ...
 * </pre>
 *
 * You may use the following to see help instructions about a command:
 * <pre>
 * php path/to/entry_script.php help <command name>
 * </pre>
 *
 * @property string $commandPath The directory that contains the command classes. Defaults to 'protected/commands'.
 * @property CConsoleCommandRunner $commandRunner The command runner.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id$
 * @package system.console
 * @since 1.0
 */
class CConsoleApplication extends CApplication
{
	/**
	 * @var array mapping from command name to command configurations.
	 * Each command configuration can be either a string or an array.
	 * If the former, the string should be the file path of the command class.
	 * If the latter, the array must contain a 'class' element which specifies
	 * the command's class name or {@link YiiBase::getPathOfAlias class path alias}.
	 * The rest name-value pairs in the array are used to initialize
	 * the corresponding command properties. For example,
	 * <pre>
	 * array(
	 *   'email'=>array(
	 *      'class'=>'path.to.Mailer',
	 *      'interval'=>3600,
	 *   ),
	 *   'log'=>'path/to/LoggerCommand.php',
	 * )
	 * </pre>
	 */
	public $commandMap=array();

	private $_commandPath;
	private $_runner;

	/**
	 * Initializes the application by creating the command runner.
	 */
	protected function init()
	{
		parent::init();
		if(!isset($_SERVER['argv'])) // || strncasecmp(php_sapi_name(),'cli',3))
			die('This script must be run from the command line.');
		$this->_runner=$this->createCommandRunner();
		$this->_runner->commands=$this->commandMap;
		$this->_runner->addCommands($this->getCommandPath());
	}

	/**
	 * Processes the user request.
	 * This method creates a console command runner to handle the particular user command.
	 */
	public function processRequest()
	{
		$this->_runner->run($_SERVER['argv']);
	}

	/**
	 * Creates the command runner instance.
	 * @return CConsoleCommandRunner the command runner
	 */
	protected function createCommandRunner()
	{
		return new CConsoleCommandRunner;
	}

	/**
	 * Displays the captured PHP error.
	 * This method displays the error in console mode when there is
	 * no active error handler.
	 * @param integer $code error code
	 * @param string $message error message
	 * @param string $file error file
	 * @param string $line error line
	 */
	public function displayError($code,$message,$file,$line)
	{
		echo "PHP Error[$code]: $message\n";
		echo "    in file $file at line $line\n";
		$trace=debug_backtrace();
		// skip the first 4 stacks as they do not tell the error position
		if(count($trace)>4)
			$trace=array_slice($trace,4);
		foreach($trace as $i=>$t)
		{
			if(!isset($t['file']))
				$t['file']='unknown';
			if(!isset($t['line']))
				$t['line']=0;
			if(!isset($t['function']))
				$t['function']='unknown';
			echo "#$i {$t['file']}({$t['line']}): ";
			if(isset($t['object']) && is_object($t['object']))
				echo get_class($t['object']).'->';
			echo "{$t['function']}()\n";
		}
	}

	/**
	 * Displays the uncaught PHP exception.
	 * This method displays the exception in console mode when there is
	 * no active error handler.
	 * @param Exception $exception the uncaught exception
	 */
	public function displayException($exception)
	{
		echo $exception;
	}

	/**
	 * @return string the directory that contains the command classes. Defaults to 'protected/commands'.
	 */
	public function getCommandPath()
	{
		$applicationCommandPath = $this->getBasePath().DIRECTORY_SEPARATOR.'commands';
		if($this->_commandPath===null && file_exists($applicationCommandPath))
			$this->setCommandPath($applicationCommandPath);
		return $this->_commandPath;
	}

	/**
	 * @param string $value the directory that contains the command classes.
	 * @throws CException if the directory is invalid
	 */
	public function setCommandPath($value)
	{
		if(($this->_commandPath=realpath($value))===false || !is_dir($this->_commandPath))
			throw new CException(Yii::t('yii','The command path "{path}" is not a valid directory.',
				array('{path}'=>$value)));
	}

	/**
	 * Returns the command runner.
	 * @return CConsoleCommandRunner the command runner.
	 */
	public function getCommandRunner()
	{
		return $this->_runner;
	}
}