<?php
// $Id$

/**
 * @file
 * Enable addition of optional metadata on video nodes created by video module.
 *
 * @author Fabio Varesano <fvaresano at yahoo dot it>
 */


/**
 * Implementation of hook_help().
 */
function video_optmetadata_help($section) {
  switch ($section) {
    case 'admin/modules#description':
      return t('Enable addition of optional metadata on video nodes created by video module. Optional metadata are Video Bitrate, Audio Bitrate, Audio Sampling Rate and Audio Channels.');
  }
}


/**
 * Implementation of hook_perm().
 */
function video_optmetadata_perm() {
  return array('insert optional metadata');
}


/**
 * Implementation of hook_form_alter()
 * We use this to add some fields to the video creation form.
 * In those fields users will be able to insert some video metadatas.
 */
function video_optmetadata_form_alter($form_id, &$form) {

  if($form_id == 'video_node_form' && isset($form['video']) && user_access('insert optional metadata')) {

    // get node object
    $node = $form['#node'];
    // Optional Video Metadata. We display this group expanded only if displaying of optional metadata is enabled.
    $form['metadata'] = array(
      '#type' => 'fieldset',
      '#title' => t('Optional Metadata'),
      '#collapsible' => TRUE,
      '#collapsed' => TRUE,
      '#weight' => -16,
      '#description' => t('Insert here the metadata informations.')
    );
    $form['metadata']['video_bitrate'] = array(
      '#type' => 'textfield',
      '#title' => t('Video Bitrate'),
      '#length' => 11,
      '#maxlength' => 11,
      '#default_value' => $node->video_bitrate,
      '#description' => t('Video bitrate in kbits/sec.')
    );
    $form['metadata']['audio_bitrate'] = array(
      '#type' => 'textfield',
      '#title' => t('Audio Bitrate'),
      '#length' => 11,
      '#maxlength' => 11,
      '#default_value' => $node->audio_bitrate,
      '#description' => t('Audio bitrate in kbits/sec.')
    );
    $form['metadata']['audio_sampling_rate'] = array(
      '#type' => 'select',
      '#title' => t('Audio Sampling Rate'),
      '#options' => array(0 => 'none', 8000 => '8 kHz', 11025 => '11 kHz', 16000 => '16 kHz', 22050 => '22 kHz', 32000 => '32 kHz', 44100 => '44.1 kHz', 48000 => '48 kHz', 96000 => '96 kHz', 192400 => '192 kHz'),
      '#default_value' => $node->audio_sampling_rate,
      '#description' => t('Integer value of audio sampling rate in Hz.')
    );
    $form['metadata']['audio_channels'] = array(
      '#type' => 'select',
      '#title' => t('Audio Channels'),
      '#options' => array('' => 'none', '5.1' => t('5.1'), 'stereo' => t('Stereo'), 'mono' => t('Mono')),
      '#default_value' => $node->audio_channels
    );
    // Ends Video Optional Metadata
  }
}


/**
 * Implementation of hook_nodeapi()
 */
function video_optmetadata_nodeapi(&$node, $op, $teaser) {
  if($node->type == 'video') {
    switch ($op) {
      case 'view':
        //Add the HTML formatted output of the optional video metadata to the bottom.
        $node->body .= theme('video_metadata', $node);
      break;
    }
  }
}

/**
 * Display optional metadata (Video and Audio bitrate,..) on the view page.
 *
 * @param $node
 *   object with node information
 *
 * @return
 *   string of content to display
 $node->video_bitrate, $node->audio_bitrate, $node->audio_sampling_rate, $node->audio_channels,
 */
function theme_video_metadata($node) {
  //Make sure atleast one fields had data.
  if ($node->video_bitrate != 0 or $node->audio_bitrate != 0 or $node->audio_sampling_rate != 0 or $node->audio_channels != 0) {
    $output = "\n\n<div class=\"video_metadata\">\n";
    $output .= '  <div class="title"><h2>'.t('Video Metadata')."</h2></div>\n";
    if($node->video_bitrate != 0) {
      $fields[] = array('title' => t('Video Bitrate') . ':', 'body' => $node->video_bitrate . ' ' . t('kbits/sec'));
    }
    if($node->audio_bitrate != 0) {
      $fields[] = array('title' => t('Audio Bitrate') . ':', 'body' => $node->audio_bitrate . ' ' . t('kbits/sec'));
    }
    if($node->audio_sampling_rate != 0) {
      $fields[] = array('title' => t('Audio Sampling Rate') . ':', 'body' => $node->audio_sampling_rate . ' ' . t('Hz'));
    }
    if($node->audio_channels != '') {
      $fields[] = array('title' => t('Audio Channels') . ':', 'body' => $node->audio_channels);
    }
    $output .= theme('video_fields', $fields); //Generate the fields HTML.
    $output .= '</div>'; //Closing div video_metadata
  }
  else { //If all the fields are blank then display nothing.
    $output = '';
  }
  return $output;
}