<?php

/**
 * @file
 * Provides Graph widget for Facet API based on Flot Library
 */

/**
 * Implements hook_facetapi_filters().
 */
function facetapi_graphs_facetapi_filters() {
  return array(
    'graph_combo_filter' => array(
      'handler' => array(
        'label' => t('Facet Combo'),
        'class' => 'FacetapiFilterGraphCombo',
      ),
    ),
  );
}

/**
 * Implements hook_facetapi_widgets().
 */
function facetapi_graphs_facetapi_widgets() {
  return array(
    'facetapi_graphs' => array(
      'handler' => array(
        'label' => t('Graphs'),
        'class' => 'FacetAPIGraphsWidgetGraphs',
        'requirements' => array(
          'facetapi_requirement_realm_property' => array('element type' => 'graphs'),
        ),
        'query types' => array(
          'term',
          'date',
        ),
      ),
    ),
    'facetapi_graphs_combo' => array(
      'handler' => array(
        'label' => t('Graphs Combo'),
        'class' => 'FacetAPIGraphsWidgetGraphsCombo',
        'query types' => array(
          'term',
          'date',
        ),
      ),
    ),
    'facetapi_graphs_combo_data' => array(
      'handler' => array(
        'label' => t('Graphs Combo Data'),
        'class' => 'FacetAPIGraphsWidgetGraphsComboData',
        'requirements' => array(
          'facetapi_requirement_realm_property' => array('element type' => 'graphs_combo_data'),
        ),
        'query types' => array(
          'term',
          'date',
        ),
      ),
    ),
  );
}

/**
 * Implements hook_facetapi_realm_info().
 */
function facetapi_graphs_facetapi_realm_info() {
  $realms = array();
  $realms['facetapi_graphs_graphs'] = array(
    'label' => t('Graphs'),
    'weight' => 90,
    'sortable' => FALSE,
    'default widget' => 'facetapi_graphs',
    'element type' => 'graphs',
    /*
     * not yet implemented sample is: facetapi_block_realm_settings (though
     * that function is not implemented anywhere yet).
     */
    'settings callback' => '',
    'description' => t(
      'You may use the <em>Graphs</em> realm to display facets as graphs.'
    ),
  );
  $realms['facetapi_graphs_graphs_data_combo'] = array(
    'label' => t('Graphs Data Combo'),
    'weight' => 100,
    'sortable' => FALSE,
    'default widget' => 'facetapi_graphs_combo_data',
    'element type' => 'graphs_combo_data',
    /*
     * not yet implemented sample is: facetapi_block_realm_settings (though
     * that function is not implemented anywhere yet).
     */
    'settings callback' => '',
    'description' => t(
      'The <em>Graphs Data Combo</em> realm is used by the facets of type
 Graph Combo to get their Y axis data. Facets from this realm are never
 displayed by themselves.'
    ),
  );
  return $realms;
}

/**
 * Implements hook_theme().
 */
function facetapi_graphs_theme() {
  $hooks['facetapi_graphs'] = array(
    'variables' => array(
      'element' => NULL,
      'data'  => NULL,
      'options'   => 'icon',
      // 'need a preprocess'
    ),
  );
  return $hooks;
}

/**
 * Fill in a bunch of page variables for our graph and load flot.
 */
function template_preprocess_facetapi_graphs(&$variables) {
  drupal_add_css(drupal_get_path('module', 'advanced_help') . '/help-popup.css');
  drupal_add_css(drupal_get_path('module', 'advanced_help') . '/help.css');
  $variables['head_title']        = implode(' | ', $head_title);
}

/**
 * Implements hook_block_info().
 *
 * We have to implement this hook because the default implementation only
 *   calls facetapi_get_block_info for the realm with the name 'block'.
 *
 * TODO: provide a patch to facetapi that implements 'block' as an attribute
 * on the realm.
 */
function facetapi_graphs_block_info() {
  $realms = (array) facetapi_graphs_facetapi_realm_info();
  unset($realms['facetapi_graphs_graphs_data_combo']);
  return facetapi_get_block_info(array_keys($realms));
}

/**
 * Implements hook_block_view().
 */
function facetapi_graphs_block_view($delta = '') {
  $data = facetapi_block_view($delta);
  $block = block_load('facetapi', $delta);
  drupal_alter('block_view', $data, $block);
  return $data;
}