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<?php
/**
 * ShellDispatcher file
 *
 * 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
 * @since         CakePHP(tm) v 2.0
 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 */

/**
 * Shell dispatcher handles dispatching cli commands.
 *
 * @package       Cake.Console
 */
class ShellDispatcher {

/**
 * Contains command switches parsed from the command line.
 *
 * @var array
 */
        public $params = array();

/**
 * Contains arguments parsed from the command line.
 *
 * @var array
 */
        public $args = array();

/**
 * Constructor
 *
 * The execution of the script is stopped after dispatching the request with
 * a status code of either 0 or 1 according to the result of the dispatch.
 *
 * @param array $args the argv from PHP
 * @param boolean $bootstrap Should the environment be bootstrapped.
 */
        public function __construct($args = array(), $bootstrap = true) {
                set_time_limit(0);
                $this->parseParams($args);

                if ($bootstrap) {
                        $this->_initConstants();
                        $this->_initEnvironment();
                }
        }

/**
 * Run the dispatcher
 *
 * @param array $argv The argv from PHP
 * @return void
 */
        public static function run($argv) {
                $dispatcher = new ShellDispatcher($argv);
                return $dispatcher->_stop($dispatcher->dispatch() === false ? 1 : 0);
        }

/**
 * Defines core configuration.
 *
 * @return void
 */
        protected function _initConstants() {
                if (function_exists('ini_set')) {
                        ini_set('html_errors', false);
                        ini_set('implicit_flush', true);
                        ini_set('max_execution_time', 0);
                }

                if (!defined('CAKE_CORE_INCLUDE_PATH')) {
                        define('DS', DIRECTORY_SEPARATOR);
                        define('CAKE_CORE_INCLUDE_PATH', dirname(dirname(dirname(__FILE__))));
                        define('CAKEPHP_SHELL', true);
                        if (!defined('CORE_PATH')) {
                                define('CORE_PATH', CAKE_CORE_INCLUDE_PATH . DS);
                        }
                }
        }

/**
 * Defines current working environment.
 *
 * @return void
 * @throws CakeException
 */
        protected function _initEnvironment() {
                if (!$this->_bootstrap()) {
                        $message = "Unable to load CakePHP core.\nMake sure " . DS . 'lib' . DS . 'Cake exists in ' . CAKE_CORE_INCLUDE_PATH;
                        throw new CakeException($message);
                }

                if (!isset($this->args[0]) || !isset($this->params['working'])) {
                        $message = "This file has been loaded incorrectly and cannot continue.\n" .
                                "Please make sure that " . DS . 'lib' . DS . 'Cake' . DS . "Console is in your system path,\n" .
                                "and check the cookbook for the correct usage of this command.\n" .
                                "(http://book.cakephp.org/)";
                        throw new CakeException($message);
                }

                $this->shiftArgs();
        }

/**
 * Initializes the environment and loads the CakePHP core.
 *
 * @return boolean Success.
 */
        protected function _bootstrap() {
                if (!defined('ROOT')) {
                        define('ROOT', $this->params['root']);
                }
                if (!defined('APP_DIR')) {
                        define('APP_DIR', $this->params['app']);
                }
                if (!defined('APP')) {
                        define('APP', $this->params['working'] . DS);
                }
                if (!defined('WWW_ROOT')) {
                        define('WWW_ROOT', APP . $this->params['webroot'] . DS);
                }
                if (!defined('TMP') && !is_dir(APP . 'tmp')) {
                        define('TMP', CAKE_CORE_INCLUDE_PATH . DS . 'Cake' . DS . 'Console' . DS . 'Templates' . DS . 'skel' . DS . 'tmp' . DS);
                }
                $boot = file_exists(ROOT . DS . APP_DIR . DS . 'Config' . DS . 'bootstrap.php');
                require CORE_PATH . 'Cake' . DS . 'bootstrap.php';

                if (!file_exists(APP . 'Config' . DS . 'core.php')) {
                        include_once CAKE_CORE_INCLUDE_PATH . DS . 'Cake' . DS . 'Console' . DS . 'Templates' . DS . 'skel' . DS . 'Config' . DS . 'core.php';
                        App::build();
                }

                $this->setErrorHandlers();

                if (!defined('FULL_BASE_URL')) {
                        $url = Configure::read('App.fullBaseUrl');
                        define('FULL_BASE_URL', $url ? $url : 'http://localhost');
                        Configure::write('App.fullBaseUrl', FULL_BASE_URL);
                }

                return true;
        }

/**
 * Set the error/exception handlers for the console
 * based on the `Error.consoleHandler`, and `Exception.consoleHandler` values
 * if they are set. If they are not set, the default ConsoleErrorHandler will be
 * used.
 *
 * @return void
 */
        public function setErrorHandlers() {
                App::uses('ConsoleErrorHandler', 'Console');
                $error = Configure::read('Error');
                $exception = Configure::read('Exception');

                $errorHandler = new ConsoleErrorHandler();
                if (empty($error['consoleHandler'])) {
                        $error['consoleHandler'] = array($errorHandler, 'handleError');
                        Configure::write('Error', $error);
                }
                if (empty($exception['consoleHandler'])) {
                        $exception['consoleHandler'] = array($errorHandler, 'handleException');
                        Configure::write('Exception', $exception);
                }
                set_exception_handler($exception['consoleHandler']);
                set_error_handler($error['consoleHandler'], Configure::read('Error.level'));
        }

/**
 * Dispatches a CLI request
 *
 * @return boolean
 * @throws MissingShellMethodException
 */
        public function dispatch() {
                $shell = $this->shiftArgs();

                if (!$shell) {
                        $this->help();
                        return false;
                }
                if (in_array($shell, array('help', '--help', '-h'))) {
                        $this->help();
                        return true;
                }

                $Shell = $this->_getShell($shell);

                $command = null;
                if (isset($this->args[0])) {
                        $command = $this->args[0];
                }

                if ($Shell instanceof Shell) {
                        $Shell->initialize();
                        return $Shell->runCommand($command, $this->args);
                }
                $methods = array_diff(get_class_methods($Shell), get_class_methods('Shell'));
                $added = in_array($command, $methods);
                $private = $command[0] === '_' && method_exists($Shell, $command);

                if (!$private) {
                        if ($added) {
                                $this->shiftArgs();
                                $Shell->startup();
                                return $Shell->{$command}();
                        }
                        if (method_exists($Shell, 'main')) {
                                $Shell->startup();
                                return $Shell->main();
                        }
                }

                throw new MissingShellMethodException(array('shell' => $shell, 'method' => $command));
        }

/**
 * Get shell to use, either plugin shell or application shell
 *
 * All paths in the loaded shell paths are searched.
 *
 * @param string $shell Optionally the name of a plugin
 * @return mixed An object
 * @throws MissingShellException when errors are encountered.
 */
        protected function _getShell($shell) {
                list($plugin, $shell) = pluginSplit($shell, true);

                $plugin = Inflector::camelize($plugin);
                $class = Inflector::camelize($shell) . 'Shell';

                App::uses('Shell', 'Console');
                App::uses('AppShell', 'Console/Command');
                App::uses($class, $plugin . 'Console/Command');

                if (!class_exists($class)) {
                        throw new MissingShellException(array(
                                'class' => $class
                        ));
                }
                $Shell = new $class();
                $Shell->plugin = trim($plugin, '.');
                return $Shell;
        }

/**
 * Parses command line options and extracts the directory paths from $params
 *
 * @param array $args Parameters to parse
 * @return void
 */
        public function parseParams($args) {
                $this->_parsePaths($args);

                $defaults = array(
                        'app' => 'app',
                        'root' => dirname(dirname(dirname(dirname(__FILE__)))),
                        'working' => null,
                        'webroot' => 'webroot'
                );
                $params = array_merge($defaults, array_intersect_key($this->params, $defaults));
                $isWin = false;
                foreach ($defaults as $default => $value) {
                        if (strpos($params[$default], '\\') !== false) {
                                $isWin = true;
                                break;
                        }
                }
                $params = str_replace('\\', '/', $params);

                if (isset($params['working'])) {
                        $params['working'] = trim($params['working']);
                }

                if (!empty($params['working']) && (!isset($this->args[0]) || isset($this->args[0]) && $this->args[0][0] !== '.')) {
                        if ($params['working'][0] === '.') {
                                $params['working'] = realpath($params['working']);
                        }
                        if (empty($this->params['app']) && $params['working'] != $params['root']) {
                                $params['root'] = dirname($params['working']);
                                $params['app'] = basename($params['working']);
                        } else {
                                $params['root'] = $params['working'];
                        }
                }

                if ($params['app'][0] === '/' || preg_match('/([a-z])(:)/i', $params['app'], $matches)) {
                        $params['root'] = dirname($params['app']);
                } elseif (strpos($params['app'], '/')) {
                        $params['root'] .= '/' . dirname($params['app']);
                }

                $params['app'] = basename($params['app']);
                $params['working'] = rtrim($params['root'], '/');
                if (!$isWin || !preg_match('/^[A-Z]:$/i', $params['app'])) {
                        $params['working'] .= '/' . $params['app'];
                }

                if (!empty($matches[0]) || !empty($isWin)) {
                        $params = str_replace('/', '\\', $params);
                }

                $this->params = array_merge($this->params, $params);
        }

/**
 * Parses out the paths from from the argv
 *
 * @param array $args
 * @return void
 */
        protected function _parsePaths($args) {
                $parsed = array();
                $keys = array('-working', '--working', '-app', '--app', '-root', '--root');
                foreach ($keys as $key) {
                        while (($index = array_search($key, $args)) !== false) {
                                $keyname = str_replace('-', '', $key);
                                $valueIndex = $index + 1;
                                $parsed[$keyname] = $args[$valueIndex];
                                array_splice($args, $index, 2);
                        }
                }
                $this->args = $args;
                $this->params = $parsed;
        }

/**
 * Removes first argument and shifts other arguments up
 *
 * @return mixed Null if there are no arguments otherwise the shifted argument
 */
        public function shiftArgs() {
                return array_shift($this->args);
        }

/**
 * Shows console help. Performs an internal dispatch to the CommandList Shell
 *
 * @return void
 */
        public function help() {
                $this->args = array_merge(array('command_list'), $this->args);
                $this->dispatch();
        }

/**
 * Stop execution of the current script
 *
 * @param integer|string $status see http://php.net/exit for values
 * @return void
 */
        protected function _stop($status = 0) {
                exit($status);
        }

}