<?php
namespace GM\VirtualPages;

/**
 * @author  Giuseppe Mazzapica <giuseppe.mazzapica@gmail.com>
 * @license http://opensource.org/licenses/MIT MIT
 */
class Controller implements ControllerInterface {

  private $pages;
  private $loader;
  private $matched;
  
  function __construct( TemplateLoaderInterface $loader ) {
    $this->pages = new \SplObjectStorage;
    $this->loader = $loader;
  }
  
  function init() {
    do_action( 'gm_virtual_pages', $this ); 
  }
  
  function addPage( PageInterface $page ) {
    $this->pages->attach( $page );
    return $page;
  }
  
  function dispatch( $bool, \WP $wp ) {
    if ( $this->checkRequest() && $this->matched instanceof Page ) {
      $this->loader->init( $this->matched );
      $wp->virtual_page = $this->matched;
      do_action( 'parse_request', $wp );
      $this->setupQuery();
      do_action( 'wp', $wp );
      $this->loader->load();
      $this->handleExit();
    }
    return $bool;
  }
  
  private function checkRequest() {
    $this->pages->rewind();
    $path = trim( $this->getPathInfo(), '/' );
    while( $this->pages->valid() ) {
      if ( trim( $this->pages->current()->getUrl(), '/' ) === $path ) {
        $this->matched = $this->pages->current();
        return TRUE;
      }
      $this->pages->next();
    }
  }        
  
  private function getPathInfo() {
    $home_path = parse_url( home_url(), PHP_URL_PATH );
    return preg_replace( "#^/?{$home_path}/#", '/', add_query_arg( array() ) );
  }
  
  private function setupQuery() {
    global $wp_query;
    $wp_query->init();
    $wp_query->is_page       = TRUE;
    $wp_query->is_singular   = TRUE;
    $wp_query->is_home       = FALSE;
    $wp_query->found_posts   = 1;
    $wp_query->post_count    = 1;
    $wp_query->max_num_pages = 1;
    $posts = (array) apply_filters(
      'the_posts', array( $this->matched->asWpPost() ), $wp_query
    );
    $post = $posts[0];
    $wp_query->posts          = $posts;
    $wp_query->post           = $post;
    $wp_query->queried_object = $post;
    $GLOBALS['post']          = $post;
    $wp_query->virtual_page   = $post instanceof \WP_Post && isset( $post->is_virtual )
      ? $this->matched
      : NULL;
  }
  
  public function handleExit() {
    exit();
  }
}