<?php
//$Id$
/**
 * @file
 * Enable Youtube support for video module.
 *
 * @author Fabio Varesano <fvaresano at yahoo dot it>
 * porting to Drupal 6
 * @author Heshan Wanigasooriya <heshan at heidisoft.com><heshanmw@gmail.com>
 * @todo
 */


// let's include apiclient logic
module_load_include('inc', 'video', 'includes/apiclient');

/**
 * Implementation of hook_menu
*/
function video_youtube_menu() {
  $items = array();
  $maycache=true;
  if($maycache) {
    $items['node/add/video/youtube'] = array(
      'title' => 'Youtube',
      'access arguments' => array('create video')
    );
    
    $items['admin/settings/video/youtube'] = array(
      'title' => 'Youtube',
      'description' => 'Configure various settings of the video Youtube plugin.',
      'access arguments' => array('administer site configuration'),
      'page callback' => 'drupal_get_form',
      'page arguments' => array('video_youtube_admin_settings'),
      'type' => MENU_NORMAL_ITEM,
    );
  }

  return $items;
}


/**
 * Setting form for video_upload
*/
function video_youtube_admin_settings() {
	$form = array();

  $form['video_youtube_auto_thumbnail'] = array(
    '#type' => 'checkbox',
    '#title' => t('Enable auto thumbnailing for youtube videos'),
    '#default_value' => variable_get('video_youtube_auto_thumbnail', false)
  );
  $form['video_youtube_related'] = array(
    '#type' => 'checkbox',
    '#title' => t('Enable related videos'),
    '#default_value' => variable_get('video_youtube_related', false),
    '#description' => t('If you enable related videos the Youtube player will display a list of related videos once the video completes playing.'),
  );
  $form['video_youtube_validation'] = array(
    '#type' => 'checkbox',
    '#title' => t('Enable validation'),
    '#default_value' => variable_get('video_youtube_validation', false),
    '#description' => t('If you enable validation, on each youtube video submission, you web server will contact Youtube to check that the inserted video is available and embeddable.'),
  );
  $form['video_youtube_api_key'] = array(
    '#type' => 'textfield',
    '#title' => t('Developer Key'),
    '#description' => t('Insert here the developer Key. You can get one from <a href="http://www.youtube.com/my_profile_dev">Youtube Development pages</a>.'),
    '#default_value' =>variable_get('video_youtube_api_key', ''),
  );
  // jlampton added: new youtube optional client id
  $form['video_youtube_client_id'] = array(
    '#type' => 'textfield',
    '#title' => t('Client ID'),
    '#description' => t('Insert here the client ID. You can get one from <a href="http://www.youtube.com/my_profile_dev">Youtube Development pages</a>.'),
    '#default_value' =>variable_get('video_youtube_client_id', ''),
  );
  return system_settings_form($form);
}


/**
 * Validate settings
*/
function video_youtube_admin_settings_validate($form, &$form_state) {
  if ($form_state['values']['video_youtube_auto_thumbnail']) { // autothumbnailing is active
    // let's check we have a valid dev key
    if($form_state['values']['video_youtube_api_key'] == '') {
      form_set_error('video_youtube_api_key', t('You have to insert a valid Youtube Developer Key for auto thumbnailing to work'));
    }
  }
}


/**
 * Implementation of hook_v_help
*/
function video_youtube_v_help() {

  $help = array();
  $help['youtube']['data'] = '<b><a href="http://www.youtube.com">' . t('YouTube.com support') . '</a></b>';
  $help['youtube']['children'] = array(t('You can host videos on youtube.com and put them on your site. To do this, after you upload the video on youtube.com enter the video URL.'));

  return $help;
}


/**
 * Implementation of hook_v_info()
*/
function video_youtube_v_info() {
  $info['youtube'] = array(
    '#name' => 'Youtube Video',
    '#description' => t('Post a video available on !link to this website.', array('!link' => l(t('Youtube'), 'http://www.youtube.com'), NULL, NULL, NULL, TRUE)),
    '#autothumbable' => variable_get('video_youtube_auto_thumbnail', false),
    '#autoresolution' => true,
    '#autoplaytime' => true,
  );

  return $info;
}


/**
 * Implementation of hook_v_form()
*/
function video_youtube_v_form(&$node, &$form) {

  $form['video']['vidfile'] = array(
    '#type' => 'textfield',
    '#title' => t('Youtube Video URL'),
    '#default_value' => $node->vidfile,
    '#maxlength' => 700,
    '#required' => TRUE,
    '#weight' => -20,
    '#description' => t('Insert the URL to the youtube video. ') . l(t('More information.'), 'video/help', array('fragment' => 'videofile')));

  return $form;
}


/**
 * implementation of hook_v_validate
*/
function video_youtube_v_validate($node) {
  if(!preg_match("/^http:\/\/([a-z]{2,3}\.)?youtube\.com\/watch\?v=/", $node->vidfile)) {
    form_set_error('vidfile', t('The Youtube Video URL field must be similar to <em>http://youtube.com/watch?v=IICWFx7sKmw</em>, <em>http://www.youtube.com/watch?v=IICWFx7sKmw</em> or <em>http://it.youtube.com/watch?v=IICWFx7sKmw</em>'));
  }
  else if(variable_get('video_youtube_validation', false)){
    // we have a good URL. Let's check that the video is available on Youtube and that it is embeddable.
    // the approach used here is to return errors only if Youtube explicitely says "an error has occurred"
    $id = _video_youtube_get_id($node->vidfile);
    // jlampton changed the youtube validation url
    $response = _video_apiclient_youtube_request('gdata.youtube.com/feeds/api/videos', array('video_id' => $id));
    if(isset($response['ERROR'])) {
      form_set_error('vidfile', t('The Youtube Video URL validation has failed for some reason. Please check the URL and try again.<br />If the error persists please contact %site_name administrators.', array('%site_name' => variable_get('site_name', 'Drupal'))));
      if(isset($response['ERROR']['DESCRIPTION'][0])) {
        drupal_set_message(t('The Youtube validation service reported the following error: %error', array('%error'=>$response['ERROR']['DESCRIPTION'][0])), 'error');
      }
    }
    else if(isset($response['VIDEO_DETAILS']['EMBED_STATUS'][0])
    && $response['VIDEO_DETAILS']['EMBED_STATUS'][0] != 'ok') {
      // embedding has been disabled. we let the video pass but we warn the user
      drupal_set_message(t('The video authors have disabled embedding on Youtube. This means that this video will only be playable directly on Youtube.'));
    }
    else { // if youtube did not explicetely said "an error has occurred" we accept the video
      ;
    }
  }
}

/**
 * Implementation of hook_v_play
*/
function video_youtube_v_play($node) {
  return theme('video_youtube_play', $node);
}


/** AUTOTHUMBNAILING LOGIC */

define('VIDEO_YOUTUBE_API_INFO', 'http://youtube.com/dev');
define('VIDEO_YOUTUBE_API_APPLICATION_URL', 'http://www.youtube.com/my_profile_dev');
define('VIDEO_YOUTUBE_REST_ENDPOINT', 'http://www.youtube.com/api2_rest');


/**
* this is a wrapper for _video_apiclient_request_xml that includes youtube's api key
*/
function _video_apiclient_youtube_request($method, $args = array(), $cacheable = TRUE) {
 $args['dev_id'] = trim(variable_get('video_youtube_api_key', ''));
 $args['method'] = $method;

 return _video_apiclient_request_xml('youtube', VIDEO_YOUTUBE_REST_ENDPOINT, $args, $cacheable);
}

/**
* returns the external url for a thumbnail of a specific video
*  @param $id
*    the youtube id of the specific video
*  @return
*    a URL pointing to the thumbnail
*/
function _video_apiclient_youtube_get_thumbnail_url($id) {
  $response = _video_apiclient_youtube_request('youtube.videos.get_details', array('video_id' => $id));
  
  if(isset($response['THUMBNAIL_URL'][0]) && $response['THUMBNAIL_URL'][0] != '') {
   return $response['THUMBNAIL_URL'][0];
  }
  return false;
}


/**
 * Implementation of hook_v_auto_thumbnail
*/
function video_youtube_v_auto_thumbnail($node) {
  if (count($_POST)) {
    if ($_POST['vidfile'] == $node->vidfile) {
      _video_image_thumbnail_debug(t('No new video to thumbnail'));
      return NULL;
    }
    if ($_POST['tempimage']['fids']['_original']) {
      _video_image_thumbnail_debug(t('Video already thumbnailed'));
      return NULL;
    }
    $vidfile = $_POST['vidfile'];
  } else {
    $vidfile = $node->vidfile;
  }
  
  //get the video id
  $id = _video_youtube_get_id($vidfile);
  // get thumbnail url
  $thumbnail_url = _video_apiclient_youtube_get_thumbnail_url($id);

  return _video_image_get_thumb_file_object($thumbnail_url, $id);
}


/**
 * Implementation of hook_v_auto_resolution
*/
function video_youtube_v_auto_resolution(&$node) {
  // we set youtube videos to 425x350 by default
  return array(425, 350);
}


/**
 * Implementation of hook_v_auto_playtime
*/
function video_youtube_v_auto_playtime(&$node) {
  $id = _video_youtube_get_id($node->vidfile);
  $response = _video_apiclient_youtube_request('youtube.videos.get_details', array('video_id' => $id)); // NOTE: here we already passed validation so we expect a valid response
  
  return $response['VIDEO_DETAILS']['LENGTH_SECONDS'][0]; // return the lenght in seconds
}


/** THEMEABLE FUNCTIONS */

/**
 * Play videos hosted on youtube.com
 * Allows users to host videos on youtube.com and then use the video ID to post it in the module.
 * In the future it could also use the youtube developer API to get info and comments of the video.
 *
 * @param $node
 *   object with node information
 *
 * @return
 *   string of content to display
 */
function theme_video_youtube_play($node) {
  $width = ($node->video_scaled_x ? $node->video_scaled_x : '425');
  $height = ($node->video_scaled_y ? $node->video_scaled_y : '350');

  $id = _video_youtube_get_id(check_plain($node->vidfile));
  
  // related video setting
  $rel = variable_get('video_youtube_related', false) ? '1' : '0';
  
  // this will be executed by not Internet Explorer browsers
  $output = '<!--[if !IE]> <-->
<object type="application/x-shockwave-flash" width="'. $width .'" height="'. $height .'"
data="http://www.youtube.com/v/' . $id . '&rel='.$rel.'">
<!--> <![endif]-->' . "\n";

  // this will be executed by Internet Explorer
  $output .= '<!--[if IE]>
<object type="application/x-shockwave-flash" width="'. $width .'" height="'. $height .'"
classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,40,0">
<![endif]-->' . "\n";

  // params will be passed to both IE or not IE browsers
  $output .= '<param name="movie" value="http://www.youtube.com/v/' . $id . '&rel='.$rel.'" />' . "\n"
  . '<param name="wmode" value="transparent" />' . "\n"
  . _video_get_parameters($node) .
  '<p>'. t('Your browser is not able to display this multimedia content.') .'</p>
</object>';


  $output = theme('video_format_play', $output, t('http://www.google.com/support/youtube'), t('Link to youtube.com'), t('youtube.com'));
  return $output;
}


/** HELPER FUNCTIONS */

/**
 * Get the id from an URL
*/
function _video_youtube_get_id($url) {
  $parsed_url = parse_url($url);
  parse_str($parsed_url['query'], $parsed_query);;
  return $parsed_query['v'];
}

/**
 * Implementation of hook_theme().
 */
function video_youtube_theme() {
  return array(
    'video_youtube_play' => array(
      'arguments' => array('node' => NULL),
    ),
  );
}