<?php
/**
 * @file
 * Code for the Farm Area feature.
 */

include_once 'farm_area.features.inc';

/**
 * Implements hook_farm_admin_actions().
 */
function farm_area_farm_admin_actions() {

  // Define farm admin actions.
  $actions = array(
    'area' => array(
      'title' => t('Add an area'),
      'href' => 'admin/structure/taxonomy/farm_areas/add',
      'paths' => array(
        'farm/areas',
      ),
    ),
  );
  return $actions;
}

/**
 * Generate area links, sorted by weight.
 *
 * @param $id
 *   The area id.
 * @param $separator
 *   Characters to use as a separator between links in the returned string.
 *
 * @return string
 *   Returns a string of links.
 */
function farm_area_get_links($id, $separator = ' | ') {

  // Call out to modules that want to provide links.
  $area_links = module_invoke_all('farm_area_links', check_plain($id));

  // Build an index of links and their weights.
  $weight_index = array();
  foreach ($area_links as $key => $link) {

    // Default the weight to zero if it hasn't been set.
    if (!isset($link['weight'])) {
      $link['weight'] = 0;
    }

    // Assign the weight to the index, based on it's key in the original array.
    $weight_index[$key] = $link['weight'];
  }

  // Sort the index by weight.
  asort($weight_index);

  // Rebuild the array of links based on their weights.
  $sorted_area_links = array();
  foreach ($weight_index as $key => $weight) {
    $sorted_area_links[] = $area_links[$key];
  }

  // Generate an array of Drupal links.
  $links = array();
  foreach ($sorted_area_links as $link) {
    if (!empty($link['title']) && !empty($link['href'])) {
      $links[] = l($link['title'], $link['href']);
    }
  }

  // Convert to a string with a separator and return.
  return implode($separator, $links);
}

/**
 * Implements hook_openlayers_map_preprocess_alter().
 */
function farm_area_openlayers_map_preprocess_alter(&$map = array()) {

  // Define the layer we are going to add.
  $layer = 'farm_area_data_all';

  // Add the 'All Areas' layer to Farm Geofield Map.
  if (!empty($map['map_name']) && $map['map_name'] == 'farm_map_geofield') {

    // Add the farm_soil_nrcs layer.
    $map['layers'] += array($layer => $layer);

    // Activate the layer by default.
    $map['layer_activated'] += array($layer => $layer);

    // Show the layer in the switcher.
    $map['layer_switcher'] += array($layer => $layer);

    // Set the layer style to Farm Grey.
    $map['layer_styles'] += array($layer => 'farm_grey');

    // Set the layer weight so that it is on the bottom.
    $map['layer_weight'] += array($layer => 100);

    // Zoom to the "All areas" layer.
    if (!empty($map['behaviors']['openlayers_behavior_zoomtolayer'])) {
      $map['behaviors']['openlayers_behavior_zoomtolayer']['zoomtolayer'][$layer] = $layer;
    }
  }
}