<?php
/**
 * @file
 * Adds playlist functionality to the media module.
 */

/**
 * Implements hook_menu().
 */
function mediaplaylist_menu() {
  // This is the minimum information you can provide for a menu item.
  $items['mediaplaylist/popup'] = array(
    'title' => 'Media Player',
    'page callback' => 'mediaplaylist_popup',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );
  $items['admin/config/mediaplaylist'] = array(
    'title' => 'Media Playlist',
    'description' => 'Admin settings for the media playlist',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('mediaplaylist_settings'),
    'access arguments' => array('administer site configuration'),
    'type' => MENU_NORMAL_ITEM,
  );

  return $items;
}


/**
 * Implements hook_theme().
 */
function mediaplaylist_theme() {
  return array(
    'mediaplaylist_popup' => array(
      'render element' => 'page',
      'template' => 'mediaplaylist-popup',
    ),
    'mediaplaylist' => array(
      'variables' => array('loader' => ''),
      'template' => 'mediaplaylist',
    ),
  );
}

/**
 * Implements hook_library().
 */
function mediaplaylist_library() {
  $module_path = drupal_get_path('module', 'mediaplaylist') . '/inc';

  $libraries['json'] = array(
    'title' => 'Media Playlist: JSON',
    'website' => 'http://www.JSON.org/js.html',
    'version' => '2.0',
    'js' => array(
      $module_path . '/json2.js' => array(),
    ),
  );

  $libraries['common'] = array(
    'title' => 'Media Playlist: Common',
    'website' => '',
    'version' => '1.2',
    'js' => array(
      $module_path . '/mediaplaylist-common.js' => array(),
    ),
    array('system', 'cookie'),
  );
  $libraries['parent'] = array(
    'title' => 'Media Playlist: Parent',
    'website' => '',
    'version' => '1.2',
    'js' => array(
      $module_path . '/mediaplaylist-parent.js' => array(),
    ),
    'dependencies' => array(
      array('system', 'cookie'),
      array('mediaplaylist', 'json'),
      array('mediaplaylist', 'common'),
    ),
  );
  // Player child.
  $libraries['player'] = array(
    'title' => 'Media Playlist: Player',
    'website' => '',
    'version' => '1.2',
    'js' => array(
      $module_path . '/mediaplaylist-player.js' => array(),
    ),
    'css' => array(
      $module_path . '/mediaplaylist-player.css' => array(),
    ),
    'dependencies' => array(
      array('system', 'drupal.ajax'),
      array('system', 'cookie'),
      array('system', 'ui'),
      array('system', 'ui.sortable'),
      array('mediaplaylist', 'json'),
      array('mediaplaylist', 'common'),
      array('jplayer', 'jplayer'),
    ),
  );
  // Player popup.
  $libraries['popup'] = array(
    'title' => 'Media Playlist: Popup Window',
    'website' => '',
    'version' => '1.2',
    'js' => array(
      $module_path . '/mediaplaylist-popup.js' => array(),
    ),
    'dependencies' => array(
      array('mediaplaylist', 'common'),
    ),
  );

  return $libraries;
}

/**
 * Implements hook_node_view().
 */
function mediaplaylist_node_view($node, $view_mode) {
  drupal_add_library('mediaplaylist', 'parent');
}

/**
 * Implements hook_entity_info_alter().
 */
function mediaplaylist_entity_info_alter(&$info) {
  // Add the 'Media Playlist' view mode for nodes.
  $info['node']['view modes'] += array(
    'mediaplaylist' => array(
      'label' => t('Media Playlist'),
      'custom settings' => TRUE,
    ),
  );
}

/**
 * Implements hook_field_formatter_info().
 */
function mediaplaylist_field_formatter_info() {
  return array(
    'mediaplaylist_links' => array(
      'label' => t('Media Playlist Links'),
      'field types' => array('file'),
      'description' => t('Display link to play an audio file in the Media Playlist player.'),
    ),
  );
}

/**
 * Implements hook_field_formatter_view().
 */
function mediaplaylist_field_formatter_view($obj_type, $object, $field, $instance, $langcode, $items, $display) {
  $element = array();
  switch ($display['type']) {
    case 'mediaplaylist_links':
      drupal_add_library('mediaplaylist', 'parent');
      foreach ($items as $delta => $item) {

        // Add the needed info to the javascript settings.
        $id = 'mediaplaylist-link-queue-' . $object->nid . '-' . $instance['field_name'] . '-' . $delta;
        drupal_add_js(array('mediaplaylist' => array('playlinks' => array($id => array('nid' => $object->nid, 'field' => $instance['field_name'])))), array('type' => 'setting'));

        // Genrate a fallback link to the file itself.
        $file = (object) $item;
        $url = file_create_url($file->uri);

        $output = theme(
          'links',
          array(
              'links' => array(
                  array(
                    'title' => t('Play'),
                    'href' => $url,
                    'attributes' => array(
                      'class' => array('mediaplaylist-link-queue'),
                      'title' => $object->title,
                      'id' => $id,
                    ),
                  ),
               ),
              'attributes' => array('class' => array('mediaplaylist-links')))
            );

        $element[$delta] = array(
          '#markup' => $output,
        );
      }
      break;
  }

  return $element;
}

/**
 * Admin settings callback.
 */
function mediaplaylist_settings($form, &$form_state) {
  $form = array();

  return system_settings_form($form);
}


/**
 * Ajax callback for loading node information.
 */
function mediaplaylist_player_ajax_callback($form, $form_state) {
  $nid = $form_state['values']['nid'];
  $output = t('You must select an something to play.');
  if ($node = node_load($nid)) {
    if (node_access('view', $node)) {
      $output = drupal_render(node_view($node, 'mediaplaylist'));
    }
  }
  $commands = array();
  $commands[] = ajax_command_html('#mediaplaylist-player', $output);
  return array('#type' => 'ajax', '#commands' => $commands);
}

/**
 * Render the player popup.
 */
function mediaplaylist_popup() {
  drupal_add_library('system', 'ajax');
  drupal_add_library('mediaplaylist', 'player');
  drupal_add_library('mediaplaylist', 'popup');

  $loader = drupal_render(drupal_get_form('mediaplaylist_ajax_reload_form'));

  $contents = array();
  $contents['player']       = array('#children' => theme('mediaplaylist', array('loader' => $loader)));

  drupal_set_page_content($contents);
  $page = element_info('page');
  $page['#theme'] = 'mediaplaylist_popup';
  $page['#show_messages'] = FALSE;
  return $page;
}

/**
 * Reload the form.
 */
function mediaplaylist_ajax_reload_form($form, &$form_state) {
  $form = array();
  $form['nid'] = array(
    '#title' => t("Node ID"),
    '#type' => 'hidden',
    '#attributes' => array('id' => 'edit-nid'),
    '#ajax' => array(
      'callback' => 'mediaplaylist_player_ajax_callback',
      'event' => 'change',
    ),
  );
  return $form;
}

/**
 * Preprocesses template variables for mediaplaylist_popup.tpl.php
 *
 * @see mediaplaylist-popup.tpl.php
 */
function template_preprocess_mediaplaylist_popup(&$variables) {
  // Move some variables to the top level for themer convenience 
  // and template cleanliness.
  $variables['show_messages'] = $variables['page']['#show_messages'];

  unset($variables['page']['page_top']);

  // Set up layout variable.
  $variables['layout'] = 'none';

  $variables['base_path']         = base_path();
  $variables['front_page']        = url();
  $variables['feed_icons']        = drupal_get_feeds();
  $variables['language']          = $GLOBALS['language'];
  $variables['language']->dir     = $GLOBALS['language']->direction ? 'rtl' : 'ltr';
  $variables['logo']              = theme_get_setting('logo');
  $variables['site_name']         = (theme_get_setting('toggle_name') ? filter_xss_admin(variable_get('site_name', 'Drupal')) : '');
  $variables['site_slogan']       = (theme_get_setting('toggle_slogan') ? filter_xss_admin(variable_get('site_slogan', '')) : '');
  $variables['tabs']              = menu_local_tabs();
}