<?php
// $Id: common.inc,v 1.30 2009-10-30 23:51:37 wimleers Exp $

/**
 * @file
 * Functions used by more than one Hierarchical Select implementation.
 */

/**
 * Retrieve a config. If certain settings are not yet configured by the user,
 * defaults will be set. These defaults can also be overriden. This allows
 * modules to provide their own meaningful defaults.
 *
 * @param $config_id
 *   A config id, typically of the form "module-someid", e.g. "taxonomy-vid".
 * @param $defaults_override
 *   Optionally override the defaults.
 */
function hierarchical_select_common_config_get($config_id, $defaults_override = array()) {
  $config = variable_get('hs_config_'. $config_id, array());
  return _hierarchical_select_inherit_default_config($config, $defaults_override);
}

/**
 * Set a config.
 *
 * @param $config_id
 *   A config id.
 * @param $config
 *   The config to store.
 */
function hierarchical_select_common_config_set($config_id, $config) {
  variable_set('hs_config_'. $config_id, $config);
}

/**
 * Delete a config.
 *
 * @param $config_id
 *   The config id to delete.
 */
function hierarchical_select_common_config_del($config_id) {
  variable_del('hs_config_'. $config_id);
}

/**
 * Apply a config to a form item.
 *
 * @param $form_item
 *   The form item that will be updated.
 * @param $config_id
 *   A config id.
 * @param $defaults_override
 *   Optionally override the defaults.
 *   @see hierarchical_select_common_config_get()
 */
function hierarchical_select_common_config_apply(&$form_item, $config_id, $defaults_override = array()) {
  $config = hierarchical_select_common_config_get($config_id, $defaults_override);
  $form_item['#config'] = array_merge((isset($form_item['#config']) && is_array($form_item['#config'])) ? $form_item['#config'] : array(), $config);
}


//----------------------------------------------------------------------------
// Forms API callbacks.

/**
 * Form definition of the hierarchical_select_common_config_form form.
 */
function hierarchical_select_common_config_form($module, $params, $config_id, $defaults_override, $strings, $max_hierarchy_depth, $preview_is_required)  {
  static $js_added;

  if (!isset($js_added)) {
    $js_added = TRUE;
    drupal_add_css(drupal_get_path('module', 'hierarchical_select') .'/includes/common_config_form.css', 'module');
    drupal_add_js(drupal_get_path('module', 'hierarchical_select') .'/includes/common_config_form.js', 'module', 'header');
    drupal_add_js(array('HierarchicalSelect' => array('configForm' => array($config_id))), 'setting');
  }

  $config = hierarchical_select_common_config_get($config_id, $defaults_override);
  $args = array(
    '!item' => $strings['item'],
    '!items' => $strings['items'],
    '!entity' => $strings['entity'],
    '!entities' => $strings['entities'],
    '!hierarchy' => $strings['hierarchy'],
    '!hierarchies' => $strings['hierarchies']
  );

  $form = array(
    '#tree' => TRUE,
    '#type' => 'fieldset',
    '#title' => t('Hierarchical Select configuration'),
    '#attributes' => array(
      'class' => 'hierarchical-select-config-form',
      'id'    => 'hierarchical-select-config-form-' . $config_id,
    ),
  );

  $form['config_id'] = array('#type' => 'value', '#value' => $config_id);

  // TODO: really make this a *live* preview, i.e. refresh the preview on each
  // change in the form. This cannot be done easily in Drupal 5, so let's do
  // so in Drupal 6. See cfg.livePreview in common_config_form.js.
  $form['live_preview'] = array(
    '#type' => 'fieldset',
    '#title' => t('Preview'),
    '#description' => t('This is what the Hierarchical Select will look like with your current configuration.'),
    '#collapsible' => FALSE,
    '#attributes' => array('class' => 'live-preview'),
  );
  $form['live_preview']['example'] = array(
    '#type' => 'hierarchical_select',
    '#required' => $preview_is_required,
    '#title' => t('Preview'),
    '#description' => t('The description.'),
    // Skip all validation.
    '#validated' => TRUE,
  );
  hierarchical_select_common_config_apply($form['live_preview']['example'], $config_id, array_merge($defaults_override, array('module' => $module, 'params' => $params)));

  $form['save_lineage'] = array(
    '#type' => 'radios',
    '#title' => t('Save lineage'),
    '#options' => array(
      1 => t('Save !item lineage', $args),
      0 => t('Save only the deepest !item', $args),
    ),
    '#default_value' => (isset($config['save_lineage'])) ? $config['save_lineage'] :  NULL,
    '#description' => t(
      'Saving the !item lineage means saving the <em>the !item itself and all
      its ancestors</em>.',
      $args
    ),
  );

  $form['enforce_deepest'] = array(
    '#type' => 'radios',
    '#title' => t('Level choice'),
    '#options' => array(
      1 => t('Force the user to choose a !item from a <em>deepest level</em>', $args),
      0 => t('Allow the user to choose a !item from <em>any level</em>', $args),
    ),
    '#default_value' => (isset($config['enforce_deepest'])) ? $config['enforce_deepest'] : NULL,
    '#description' => t(
      'This setting determines from which level in the !hierarchy tree a
      user can select a !item.',
      $args
    ),
    '#attributes' => array('class' => 'enforce-deepest'),
  );

  if (module_hook($module, 'hierarchical_select_entity_count')) {
    $form['entity_count'] = array(
      '#type' => 'radios',
      '#title' => t('Display the !entity count', $args),
      '#description' => t(
        'When enabled, the user will see the number of !entities that match
        the current !item listed between brackets.',
        $args
      ),
      '#options' => array(
        0 => t('Disabled'),
        1 => t('Enabled'),
      ),
      '#default_value' => (isset($config['entity_count'])) ? $config['entity_count'] : NULL,
      '#attributes' => array('class' => 'entity-count'),
    );

    $form['require_entity'] = array(
      '#type' => 'radios',
      '#title' => t('Require associated !entity', $args),
      '#description' => t(
        'When enabled, !items will only be displayed when they are associated
        with at least one !entity, or if one of their child !items are
        associated with at least one !entity.',
        $args
      ),
      '#options' => array(
        0 => t('Disabled'),
        1 => t('Enabled'),
      ),
      '#default_value' => (isset($config['require_entity'])) ? $config['require_entity'] : NULL,
      '#attributes' => array('class' => 'require-entity'),
    );
  }

  $form['resizable'] = array(
    '#type' => 'radios',
    '#title' => t('Resizable'),
    '#description' => t(
      "When enabled, a handle appears below the Hierarchical Select to allow
      the user to dynamically resize it. Double clicking will toggle between
      the smallest and a sane 'big size'."
    ),
    '#options' => array(
      0 => t('Disabled'),
      1 => t('Enabled'),
    ),
    '#default_value' => (isset($config['resizable'])) ? $config['resizable'] : NULL,
    '#attributes' => array('class' => 'resizable'),
  );

  $form['level_labels'] = array(
    '#tree' => TRUE,
    '#type' => 'fieldset',
    '#title' => t('Level labels'),
    '#description' => t(
      'When the user is allowed to choose a !item from any level in the
      <em>Level choice</em> setting, you can enter a label for <em>each</em>
      level.<br />
      However, when the user is only allowed to choose a !item from the
      deepest level, then you can only enter a label for the <em>root</em>
      level.',
      $args
    ),
    '#collapsible' => TRUE,
  );
  $form['level_labels']['status'] = array(
    '#type' => 'checkbox',
    '#title' => t('Enable level labels'),
    '#default_value' => (isset($config['level_labels']['status'])) ? $config['level_labels']['status'] : NULL,
    '#attributes' => array('class' => 'level-labels-status'),
  );
  for ($depth = 0; $depth <= $max_hierarchy_depth; $depth++) {
    $form['level_labels']['labels'][$depth] = array(
      '#type' => 'textfield',
      '#size' => 20,
      '#maxlength' => 255,
      '#default_value' => (isset($config['level_labels']['labels'][$depth])) ? $config['level_labels']['labels'][$depth] : NULL,
      '#attributes' => array('class' => 'level-label'),
    );
  }
  $form['level_labels']['#theme'] = 'hierarchical_select_common_config_form_level_labels';
  $form['level_labels']['#strings'] = $strings;

  $form['dropbox'] = array(
    '#type' => 'fieldset',
    '#title' => t('Dropbox settings'),
    '#description' => t('The dropbox allows the user to <strong>make multiple selections</strong>.'),
    '#collapsible' => TRUE,
  );
  $form['dropbox']['status'] = array(
    '#type' => 'checkbox',
    '#title' => t('Enable the dropbox'),
    '#default_value' => (isset($config['dropbox']['status'])) ? $config['dropbox']['status'] : NULL,
    '#attributes' => array('class' => 'dropbox-status'),
  );
  $form['dropbox']['title'] = array(
    '#type' => 'textfield',
    '#title' => t('Title'),
    '#description' => t('The title you enter here appears above the dropbox.'),
    '#size' => 20,
    '#maxlength' => 255,
    '#default_value' => (isset($config['dropbox']['title'])) ? $config['dropbox']['title'] : NULL,
    '#attributes' => array('class' => 'dropbox-title'),
  );
  $form['dropbox']['limit'] = array(
    '#type' => 'textfield',
    '#title' => t('Limit the number of selections'),
    '#description' => t(
      'Limits the number of selections that can be added to the dropbox.
      0 means no limit.
      <br />
      Note: the "Save !item lineage" option has no effect on this, even if
      a lineage consists of 3 !items, this will count as only one selection
      in the dropbox.',
      $args
    ),
    '#size' => 5,
    '#maxlength' => 5,
    '#default_value' => (isset($config['dropbox']['limit'])) ? $config['dropbox']['limit'] : NULL,
    '#attributes' => array('class' => 'dropbox-limit'),
  );
  $form['dropbox']['reset_hs'] = array(
    '#type' => 'radios',
    '#title' => t('Reset selection of hierarchical select'),
    '#description' => t(
      'This setting determines what will happen to the hierarchical select
      when the user has added a selection to the dropbox.'
    ),
    '#options' => array(
      0 => t('Disabled'),
      1 => t('Enabled'),
    ),
    '#default_value' => (isset($config['dropbox']['reset_hs'])) ? $config['dropbox']['reset_hs'] : NULL,
    '#attributes' => array('class' => 'dropbox-reset-hs'),
  );

  if (module_hook($module, 'hierarchical_select_create_item')) {
    $form['editability'] = array(
      '#type' => 'fieldset',
      '#title' => t('Editability settings'),
      '#description' => t(
        'You can allow the user to <strong>add new !items to this
        !hierarchy</strong> <em>through</em> Hierarchical Select.',
        $args
      ),
      '#collapsible' => TRUE,
    );
    $form['editability']['status'] = array(
      '#type' => 'checkbox',
      '#title' => t('Allow creation of new !items', $args),
      '#options' => array(
        0 => t('Disabled'),
        1 => t('Enabled'),
      ),
      '#default_value' => (isset($config['editability']['status'])) ? $config['editability']['status'] : NULL,
      '#attributes' => array('class' => 'editability-status'),
    );
    for ($depth = 0; $depth <= $max_hierarchy_depth; $depth++) {
      $form['editability']['item_types'][$depth] = array(
        '#type' => 'textfield',
        '#size' => 20,
        '#maxlength' => 255,
        '#default_value' => (isset($config['editability']['item_types'][$depth])) ? $config['editability']['item_types'][$depth] : NULL,
        '#attributes' => array('class' => 'editability-item-type'),
      );
    }
    for ($depth = 0; $depth <= $max_hierarchy_depth; $depth++) {
      $form['editability']['allowed_levels'][$depth] = array(
        '#type' => 'checkbox',
        '#default_value' => (isset($config['editability']['allowed_levels'][$depth])) ? $config['editability']['allowed_levels'][$depth] : 1,
      );
    }
    $form['editability']['allow_new_levels'] = array(
      '#type' => 'checkbox',
      '#title' => t('Allow creation of new levels'),
      '#default_value' => $config['editability']['allow_new_levels'],
      '#description' => t(
        'Allow the user to create child !items for !items that do not yet have
        children.',
        $args
      ),
      '#attributes' => array('class' => 'editability-allow-new-levels'),
    );
    $form['editability']['max_levels'] = array(
      '#type' => 'select',
      '#title' => t('Maximum number of levels allowed'),
      '#options' => array(
        0 => t('0 (no limit)'), 1, 2, 3, 4, 5, 6, 7, 8, 9
      ),
      '#default_value' => (isset($config['editability']['max_levels'])) ? $config['editability']['max_levels'] : NULL,
      '#description' => t(
        'When the user is allowed to create new levels, this option prevents
        the user from creating extremely deep !hierarchies.',
        $args
      ),
      '#attributes' => array('class' => 'editability-max-levels'),
    );

    $form['editability']['#theme'] = 'hierarchical_select_common_config_form_editability';
    $form['editability']['#strings'] = $strings;
  }

  return $form;
}

/**
 * Submit callback for the hierarchical_select_common_config_form form.
 */
function hierarchical_select_common_config_form_submit($form, &$form_state) {
  $config = _hierarchical_select_get_form_item_by_parents($form_state['values'], $form['#hs_common_config_form_parents']);

  // Don't include the value of the live preview in the config.
  unset($config['live_preview']);

  hierarchical_select_common_config_set($config['config_id'], $config);
}

/**
 * Helper function that adds the JS to make Hierarchical Select work when used
 * as a Views exposed filter.
 */
function hierarchical_select_common_add_views_js() {
  static $js_added;

  if (!isset($js_added)) {
    drupal_add_js(drupal_get_path('module', 'hierarchical_select') .'/includes/views.js', 'module');
  }
}

/**
 * Get the form element of a form that has a certain lineage of parents.
 *
 * @param $form
 *   A structured array for use in the Forms API.
 * @param $parents
 *   An array of parent form element names.
 * @return
 *  The form element that has the specified lineage of parents.
 */
function _hierarchical_select_get_form_item_by_parents($form, $parents) {
  if (count($parents)) {
    $parent = array_shift($parents);
    return _hierarchical_select_get_form_item_by_parents($form[$parent], $parents);
  }
  else {
    return $form;
  }
}