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<?php

/**
 * @author Roman Chvanikoff <chvanikoff@gmail.com>
 * @copyright 2011
 */

/**
 * The class that is extended by all controllers
 * 
 * @class Controller_Front
 */
class Controller_Front extends Controller {
    
    /**
     * Controller's response data
     * 
     * @var mixed $content
     */
    private $content = FALSE;
    
    /**
     * if current request have POST data - this var will be set to Validation object for the data
     * 
     * @var Validation $post
     */
    private $post = FALSE;
    
    /**
     * Name of the layout to use. After Controller finished its job - Layout object.
     * 
     * @var string|Layout $layout
     */
    protected $_layout = 'default';
    
    /**
	 * Automatically executed before the controller action. Can be used to set
	 * class properties, do authorization checks, and execute other custom code.
	 *
	 * @return  void
	 */
    public function before()
    {
        parent::before();
        
        /**
         * Set the language
         * 
         * @todo When multilanguage will be implemented - change it to current user's language
         */
        I18n::lang(Kohana::$config->load('application')->language);
        
        if ($this->request->post())
        {
            $this->post = Validation::factory($this->request->post());
        }
        // If request is not initial - we dont need layout
        if ($this->request->is_initial())
        {
            $this->_layout = Layout::factory($this->_layout);
        }
    }
    
    /**
	 * Automatically executed after the controller action. Can be used to apply
	 * transformation to the request response, add extra output, and execute
	 * other custom code.
	 *
	 * @return  void
	 */
    public function after()
    {
        if ($this->content === FALSE)
        {
            // Set the content by default as view called DIRECTORY/CONTROLLER/ACTION
            $this->set_content();
        }
        
        if ($this->request->is_ajax())
        {
            $this->response_ajax();
        }
        elseif ($this->request->is_initial())
        {
            if ($this->content instanceof View)
            {
                $this->content
                    ->set('post', $this->post);
            }
            $this->_layout
                ->set('content', $this->content)
                ->set('user', Auth::instance()->get_user());
        }
        else
        {
            $this->response->body($this->content);
        }
        
        parent::after();
    }
    
    /**
     * Set the content.
     *      If called without params:
     *      $this->set_content()
     *      content will be set as View object with name
     *      (CURRENT_REQUEST_DIRECTORY/)CURRENT_REQUEST_CONTROLLER/CURRENT_REQUEST_ACTION
     * 
     * @param mixed $data
     * @param bool $data_is_view
     * @param array $view_data
     * @return void
     */
    public function set_content($data = NULL, $data_is_view = TRUE, $view_data = array())
    {
        if ($data_is_view)
        {
            if ($data === NULL)
            {
                $data = ($this->request->directory() === '')
                    ? ''
                    : $this->request->directory().'/';
                $data .= $this->request->controller().'/';
                $data .= $this->request->action();
            }
            
            $data = View::factory($data, $view_data);
        }
        
        $this->content = $data;
    }
    
    /**
     * Response JSON to AJAX requests and send JSON headers
     * If any errors occured while executing controller, data will not be sent.
     * 
     * @return void
     */
    private function response_ajax()
    {
        $data = array('errors' => Errors::get_errors(FALSE));
        if ($data['errors'] === NULL)
        {
            $data['data'] = $this->content;
        }
        $this->response
            ->headers('Content-type', File::mime_by_ext('json'))
            ->body(json_encode($data));
    }
}