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<?php

require_once __DIR__ . '/AbstractModel.php';

require_once __DIR__ . '/Registry.php';

/**

 * Basic application class

 *

 * @author Thomas Lahn

 */

class Application

{

  /**

   * Relative path to the controllers directory

   * @var string

   */

  protected $_controllerPath = 'application/controllers';

  /**

   * Default controller of the application

   * @var string

   */

  protected $_defaultController = 'Index';

  /**

   * Registry key for the default database of the application

   * @var string

   */

  protected $_defaultDatabase;

  /**

   * Currently active controller of this application

   * @var Controller

   */

  protected $_currentController;

  /**

   * Singleton

   *

   * @var Application

   */

  private static $_instance;

  protected function __construct()

  {

    /* Singleton pattern */

  }

  /**

   * Gets a reference to the <code>Application</code> instance

   *

   * @param Application $instance

   *   The instance to be used as application.  The default is a new

   *   application.  This parameter is ignored if the application was

   *   already initialized.

   * @return Application

   */

  public static function getInstance(Application $instance = null)

  {

    if (self::$_instance === null)

    {

      self::$_instance = ($instance === null) ? new self() : $instance;

    }

    return self::$_instance;

  }

  /**

   * Getter for properties

   *

   * @param string $name

   * @throws ModelPropertyException

   * @return mixed

   */

  public function __get($name)

  {

    /* Support for Object-Relational Mappers */

    if (strpos($name, 'persistent') === 0)

    {

      $class = get_class($this);

      return $class::${$name};

    }

    $method = 'get' . ucfirst($name);

    if (method_exists($this, $method))

    {

      return $this->$method();

    }

    if (property_exists($this, "_$name"))

    {

      return $this->{"_$name"};

    }

    return $this->$name;

  }

  /**

   * Setter for properties

   *

   * @param string $name

   * @param mixed $value  The new property value before assignment

   * @throws ModelPropertyException

   */

  public function __set($name, $value)

  {

    $method = 'set' . ucfirst($name);

    if (method_exists($this, $method))

    {

      return $this->$method($value);

    }

    if (property_exists($this, "_$name"))

    {

      $this->{"_$name"} = $value;

      return $this->{"_$name"};

    }

    /* NOTE: Attempts to set other properties are _silently_ _ignored_ */

  }

  /**

   * Runs the application, setting up session management and

   * constructing the controller indicated by the URI

   */

  public function run()

  {

    $this->startSession();

    $controller = self::getParam('controller', $_REQUEST);

    if (!$controller)

    {

      $controller = $this->_defaultController;

    }

    $controller = ucfirst($controller);

    $controller = $controller . 'Controller';

    require_once "{$this->_controllerPath}/{$controller}.php";

    $this->_currentController = new $controller();

    return $this;

  }

  protected function startSession()

  {

    session_start();

  }

  /**

   * Gets a request parameter

   *

   * @param string $key

   *   Key to look up in the array

   * @param array $array

   *   Array where to look up <var>$key</var>.

   *   The default is <code>$_GET</code>.

   * @return mixed

   *   <code>null</code> if there is no such <var>$key</var>

   *   in <var>$array</var>

   */

  public static function getParam($key, array $array = null)

  {

    if ($array === null)

    {

      $array = $_GET;

    }

    return isset($array[$key]) ? $array[$key] : null;

  }

  /**

   * Registers a database

   *

   * @param string $key

   * @param Database $database

   * @return string Registry key

   * @see Application::setDefaultDatabase()

   */

  public function registerDatabase ($key, Database $database)

  {

    Registry::set($key, $database);

    return $key;

  }

  /**

   * Sets the default database

   * @param string Registry key to refer to the {@link Database}

   */

  public function setDefaultDatabase ($key)

  {

    $this->_defaultDatabase = $key;

  }

  /**

  * Sets the current controller for this application

  *

  * @param Controller $controller

  * @return Application

  */

  public function setCurrentController(Controller $controller)

  {

    $this->_currentController = $controller;

    return $this;

  }

  /**

   * Returns the current controller for this application

   *

   * @return Controller

   */

  public function getCurrentController()

  {

    return $this->_currentController;

  }

  /**

   * Returns the default database for this application

   *

   * @return Database

   */

  public function getDefaultDatabase()

  {

    return Registry::get($this->_defaultDatabase);

  }

  /**

   * Returns a relative URI-reference for an action of the

   * application

   *

   * @param string[optional] $controller

   * @param string[optional] $action

   * @param int[optional] $id

   */

  public function getURL($controller = null, $action = null, $id = null)

  {

    /* Apache module */

    $url = self::getParam('SCRIPT_URL', $_SERVER);

    if ($url === null)

    {

      /* FastCGI */

      $url = self::getParam('URL', $_SERVER);

      if ($url === null)

      {

        /* Server/PHP too old, compute URI */

        $url = self::getParam('REQUEST_URI', $_SERVER);

        if (preg_match('/^[^?]+/', $url, $matches) > 0)

        {

          $url = $matches[0];

        }

        else

        {

          /* Has .php in it, but at least it works */

          $url = self::getParam('SCRIPT_NAME', $_SERVER);

          if ($url === null)

          {

            throw new Exception(

              'None of $_SERVER["SCRIPT_URL"], $_SERVER["URL"],'

              . ' $_SERVER["REQUEST_URI"], or $_SERVER["SCRIPT_NAME"]'

              . ' is available, cannot continue.');

          }

        }

      }

    }

    $query = (($controller !== null) ? 'controller=' . $controller : '')

           . (($action !== null) ? '&action=' . $action : '')

           . (($id !== null) ? '&id=' . $id : '');

    return $url . ($query ? '?' . $query : '');

  }

  /**

   * Performs a server-side redirect within the application

   */

  public static function redirect($query = '')

  {

    $script_uri = self::getParam('SCRIPT_URI', $_SERVER);

    if ($script_uri === null)

    {

      /* Server/PHP too old, compute URI */

      if (preg_match('/^[^?]+/',

          self::getParam('REQUEST_URI', $_SERVER), $matches) > 0)

      {

        $query_prefix = $matches[0];

      }

      else

      {

        /* Has .php in it, but at least it works */

        $query_prefix = self::getParam('SCRIPT_NAME', $_SERVER);

      }

      /* TODO: Let user decide which ports map to which URI scheme */

      $script_uri = (self::getParam('SERVER_PORT', $_SERVER) == 443

                      ? 'https://'

                      : 'http://')

                  . self::getParam('HTTP_HOST', $_SERVER)

                  . $query_prefix;

    }

    header('Location: ' . $script_uri

      . ($query ? (substr($query, 0, 1) === '?' ? '' : '?') . $query : ''));

  }

}