<?php

class WDTSTranscriptManager { 
  var $key = null;
  var $post_id = null;
  var $allow_multiple = false;
  
  function __construct($post_id = null) {
    if (is_numeric($post_id)) { $this->post_id = $post_id; }     
  }
  
  function WDTSTranscriptManager($post_id = null) {
    $this->__construct($post_id);
  }
  
  function _get_transcripts_metadata() {
    $transcripts = false;
    if (!is_null($this->key)) {
      $post = get_post($this->post_id);
      if (!empty($post)) {
        $transcripts = get_post_meta($this->post_id, $this->key, true);
        if (!is_array($transcripts)) { $transcripts = array(); }
      }
    }
    return $transcripts;
  }
  
  /**
   * Save a transcript to a post.
   * @param int $post_id The post to attach the transcript to.
   * @param string $language The language of the transcript.
   * @param string $transcript The transcript content.
   * @return bool True if the transcript was saved, false otherwise.
   */
  function save_transcript($transcript_info) {    
    $user = wp_get_current_user();
    if (!empty($user)) {
      $transcript_info = (array)$transcript_info;          
      $transcript_info['user_id'] = $user->ID;
      unset($transcript_info['key']);
      
      if (($transcripts = $this->_get_transcripts_metadata()) !== false) {
        $max_key = 0;
        foreach ($transcripts as $transcript) {
          $max_key = max($max_key, $transcript['key']) + 1;  
        }
        $transcript_info['key'] = $max_key;
        
        if ($this->allow_multiple) {
          $transcripts[] = $transcript_info;
        } else {
          $new_transcripts = array();
          $was_added = false;
          foreach ($transcripts as $transcript) {
            if ($transcript['language'] == $transcript_info['language']) {
              $was_added = true;
              $transcript_info['key']--;
              $new_transcripts[] = $transcript_info;
            } else {
              $new_transcripts[] = $transcript; 
            }
          }
          if (!$was_added) { $new_transcripts[] = $transcript_info; }
          $transcripts = $new_transcripts;
        }
        
        return update_post_meta($this->post_id, $this->key, $transcripts);
      }
    }
    return false;       
  }
  
  function delete_transcript($language = null) {
    return $this->_delete_transcript_by_field('language', $language);
  }
  
  function delete_transcript_by_key($key = null) {
    return $this->_delete_transcript_by_field('key', $key);
  }
  
  function _delete_transcript_by_field($field, $value) {
    if (($transcripts = $this->_get_transcripts_metadata()) !== false) {      
      $new_transcripts = array();
      $deleted_transcript = false;
      foreach ($transcripts as $transcript) {
        if ($transcript[$field] != $value) {
          $new_transcripts[] = $transcript;
        } else {
          $deleted_transcript = $transcript;
        }
      }

      update_post_meta($this->post_id, $this->key, $new_transcripts);
      return $deleted_transcript;
    } 
    return false;    
  }
  
  function get_transcripts() {
    return $this->_get_transcripts_metadata();
  }
  
  function get_transcripts_for_user($user_id) {
    $user_transcripts = array();
    if (($transcripts = $this->_get_transcripts_metadata()) !== false) {      
      foreach ($transcripts as $transcript) {
        if ($transcript['user_id'] == $user_id) { $user_transcripts[] = $transcript; }
      }
    }
    return $user_transcripts;
  }
  
  function get_languages() {
    $languages = array();
    if (($transcripts = $this->_get_transcripts_metadata()) !== false) {      
      foreach ($transcripts as $transcript) {
        $languages[$transcript['language']] = true; 
      }
    }
    return array_keys($languages);
  }
}

?>