<?php

/**
 * @file
 * Plugin to provide an argument handler for a Taxonomy term.
 */

/**
 * Plugins are described by creating a $plugin array which will be used
 * by the system that includes this file.
 */
$plugin = array(
  'title' => t("Taxonomy term (multiple): ID"),
  // Keyword to use for %substitution.
  'keyword' => 'term',
  'description' => t('Creates a group of taxonomy terms from a list of tids separated by a comma or a plus sign. In general the first term of the list will be used for panes.'),
  'context' => 'ctools_terms_context',
  'default' => array('breadcrumb' => TRUE),
  'settings form' => 'ctools_terms_settings_form',
  'placeholder form' => array(
    '#type' => 'textfield',
    '#description' => t('Enter a term ID or a list of term IDs separated by a + or a ,'),
  ),
  'breadcrumb' => 'ctools_terms_breadcrumb',
);

/**
 * Discover if this argument gives us the term we crave.
 */
function ctools_terms_context($arg = NULL, $conf = NULL, $empty = FALSE) {
  // If unset it wants a generic, unfilled context.
  if ($empty) {
    return ctools_context_create_empty('terms');
  }

  $terms = ctools_break_phrase($arg);
  if (empty($terms->value) || !empty($terms->invalid_input)) {
    return FALSE;
  }

  $context = ctools_context_create('terms', $terms);
  $context->original_argument = $arg;
  return $context;
}

/**
 * Settings form for the argument.
 */
function ctools_terms_settings_form(&$form, &$form_state, $conf) {
  $form['settings']['breadcrumb'] = array(
    '#title' => t('Inject hierarchy of first term into breadcrumb trail'),
    '#type' => 'checkbox',
    '#default_value' => !empty($conf['breadcrumb']),
    '#description' => t('If checked, taxonomy term parents will appear in the breadcrumb trail.'),
  );
}

/**
 * Inject the breadcrumb trail if necessary.
 */
function ctools_terms_breadcrumb($conf, $context) {
  if (empty($conf['breadcrumb'])) {
    return;
  }

  $current = new stdClass();
  $current->tid = $context->tids[0];
  $breadcrumb = array();
  while ($parents = taxonomy_get_parents($current->tid)) {
    $current = array_shift($parents);
    $breadcrumb[] = l($current->name, 'taxonomy/term/' . $current->tid);
  }

  $breadcrumb = array_merge(drupal_get_breadcrumb(), array_reverse($breadcrumb));
  drupal_set_breadcrumb($breadcrumb);
}