/**
 * Create a method of adding extra meta data to Taxonomy objects of the custom post type 'html_tag'
 * This adds the meta boxes to the WP Admin page
 */

// Define meta boxes to be created
$taxonomy_meta_boxes =
  array(
    "subtitle" => array(
      "name" => "subtitle",
      "type" => "input",
      "context" => "line",
      "std" => "",
      "title" => "Subtitle",
      "description" => "Enter a <em>Subtitle</em> for this post."
    ),
    "value" => array(
      "name" => "value",
      "type" => "input",
      "context" => "paragraph",
      "std" => "",
      "title" => "Values",
      "description" => "Add the values that this attribute accepts."
    ),
    "additional" => array(
      "name" => "additional_info",
      "type" => "input",
      "context" => "paragraph",
      "std" => "",
      "title" => "Additional Information",
      "description" => "Enter any additional information for this attribute."
    )
  );

// Setup meta boxes
function taxonomy_meta_boxes() {
  global $tag, $taxonomy_meta_boxes;
  echo'<h2>test</h2>';
  foreach($taxonomy_meta_boxes as $taxonomy_meta_box) {
  echo'<p>wtf</p>';
    $taxonomy_meta_box_value = get_metadata('decoded_taxonomy', $tag->term_id, 'new_metadata', TRUE);
    if($taxonomy_meta_box_value == "") {
      $taxonomy_meta_box_value = $taxonomy_meta_box['std'];
    }
    echo'<h3>test</h3>';
    echo'<p>wtf wtf</p>';
    echo'<tr class="form-field">';
    echo'<input type="hidden" name="'.$taxonomy_meta_box['name'].'_noncename" id="'.$taxonomy_meta_box['name'].'_noncename" value="'.wp_create_nonce( plugin_basename(__FILE__) ).'" />';
    echo'<th valign="top" scope="row">';
    echo'<label for="'.$taxonomy_meta_box['title'].'">'.$taxonomy_meta_box['title'].'</label></th>';
    if($taxonomy_meta_box['context'] == "line") {
      echo'<td><input id="'.$taxonomy_meta_box['name'].'" type="text" size="40" name="'.$taxonomy_meta_box['name'].'" value="'.$taxonomy_meta_box_value.'"/>';
    }
    elseif($taxonomy_meta_box['context'] == "paragraph") {
      echo'<textarea id="'.$taxonomy_meta_box['name'].'" style="width:97%;" cols="50" rows="5" name="'.$taxonomy_meta_box['name'].'">'.$taxonomy_meta_box_value.'</textarea>';
    }
    echo'<p class="description">'.$taxonomy_meta_box['description'].'</p></td>';
  }
}

// Add meta boxes
function create_attr_meta_box() {
  if ( function_exists('add_meta_box') ) {
    add_meta_box( 'taxonomy-meta-boxes', 'Taxonomy Details', 'taxonomy_meta_boxes', 'html_tag', 'normal', 'high' );
  }
}

add_action('edit_tag_form_fields', 'create_attr_meta_box');

// Save meta data when doing post save
function save_html_postdata( $post_id ) {
  global $taxonomy_meta_boxes;
  foreach($taxonomy_meta_boxes as $taxonomy_meta_box) {
    if ( !wp_verify_nonce( $_POST[$taxonomy_meta_box['name'].'_noncename'], plugin_basename(__FILE__) )) {
     return $post_id;
    }
    if ( 'page' == $_POST['post_type'] ) {
      if ( !current_user_can( 'edit_page', $post_id )) {
        return $post_id;
      }
    }
    else {
      if ( !current_user_can( 'edit_post', $post_id )) {
        return $post_id;
      }
    }
    $data = $_POST[$taxonomy_meta_box['name']];
    if(get_post_meta($post_id, $taxonomy_meta_box['name']) == "") {
      add_post_meta($post_id, $taxonomy_meta_box['name'], $data, true);
    }
    elseif($data != get_post_meta($post_id, $taxonomy_meta_box['name'], true)) {
      update_post_meta($post_id, $taxonomy_meta_box['name'], $data);
    }
    elseif($data == "") {
      delete_post_meta($post_id, $taxonomy_meta_box['name'], get_post_meta($post_id, $taxonomy_meta_box['name'], true));
    }
  }
}
add_action('save_post', 'save_html_postdata');

// called in save_tag_data
function get_term_taxonomy($term_id) {
  global $wpdb;
  $taxonomy = $wpdb->get_var($wpdb->prepare("SELECT taxonomy FROM $wpdb->term_taxonomy WHERE term_id = %d", $term_id));
  return $taxonomy;
}

// Save data when in edit_tag_form
function save_tag_data($term_id) {
  if (isset($_POST[$taxonomy_meta_box['name']])) {
    // get term
    $taxonomy = get_term_taxonomy($term_id);
    $meta_key = $taxonomy . '_taxonomy';
    $tag_attribute = esc_attr($_POST[$taxonomy_meta_box['name']]);
    if ($tag_attribute)
      update_metadata('decoded_taxonomy', $term_id, $taxonomy_meta_key, $tag_attribute);
    else
      delete_metadata('decoded_taxonomy', $term_id, $taxonomy_meta_key);
  }
}
add_action('edited_tag', 'save_tag_data');

// Register Decoded-Taxonomy Table
function activate_taxonomy_meta() {
  require_once("taxonomy-meta.php");
  if (class_exists("Taxonomy_MetaData")) {
    $this->metadata = new Taxonomy_MetaData();
  }
  $this->metadata->metadata_install_type('decoded_taxonomy');  // this defines $type='decoded_taxonomy'
}

function register_custom_taxonomy_table() {
  global $wpdb;
  $wpdb->decoded_taxonomymeta = $wpdb->prefix . 'decoded_taxonomymeta';
}

add_action ('init', 'activate_taxonomy_meta');
add_action ('init', 'register_custom_taxonomy_table');