<?php

/**
 * @file
 * Provide Leaflet API integration and field formatters.
 */

module_load_include('inc', 'leaflet', 'leaflet.formatters');

/**
  * Implements hook_help().
  */
function leaflet_help($path, $arg) {
  switch ($path) {
    case 'admin/help#leaflet':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('The Leaflet module provides integration with Leaflet, the modern open-source JavaScript library for mobile-friendly interactive maps.') . '</p>';

      $output .= '<p>' . t('The module provides a field formatter that can show a map for fields that contain geospatial data.  It includes Views integration that plots data on a map (using the sub module Leaflet Views) and an API for displaying data on a map. For more information, see the online documentation for the <a href="@leaflet">Leaflet module</a>.', array('@leaflet' => 'http://drupal.org/node/1645460')) . '</p>';

      $output .= '<h3>' . t('Uses') . '</h3>';
      $output .= '<dl>';
      $output .= '<dt>' . t('Field Formatter') . '</dt>';
      $output .= '<dd>' . t('Leaflet includes a field formatter that makes it possible to show geospatial data (for example longitude and latitude) on a map.  You can use tokens instead of static text for Popups that use the Leaflet field formatter.') . '</dd>';
      $output .= '<dt>' . t('Views Integration') . '</dt>';
      $output .= '<dd>' . t('You can have maps on node displays and maps on views displays, thanks to Views integration. The process is very similar to adding and setting up a plugin on Views.  To render a map using Views, enable the included module Leaflet_views.') . '</dd>';
      $output .= '<dt>' . t('Leaflet API') . '</dt>';
      $output .= '<dd>' . t('Rendering a map is as simple as calling a single method, leaflet_render_map(), which takes 3 parameters $map, $features, and $height.') . '</dd>';
      return $output;
  }
}

/**
 * Implements hook_theme().
 */
function leaflet_theme($existing, $type, $theme, $path) {
  return array(
    'leaflet_map' => array(
      'arguments' => array('map_id' => NULL, 'height' => '400px'),
      'template' => 'leaflet_map',
    ),
  );
}

/**
 * Implements hook_libraries_info().
 */
function leaflet_libraries_info() {
  $libraries['leaflet'] = array(
    // Only used in administrative UI of Libraries API.
    'name' => 'Leaflet JavaScript Library',
    'vendor url' => 'http://leafletjs.com/',
    'download url' => 'http://cdn.leafletjs.com/leaflet/v1.0.2/leaflet.zip',
    'version arguments' => array(
      'file' => 'leaflet.js',
      // Handle patterns like  version: "1.0.2+4bbb16c"
      'pattern' => '/version[=: ]*[\'"]([\d+\.]+[\-a-z\.\d]*)[\'"]/',
    ),
    'files' => array(
      'js' => array(
        // This setting is needed in order to properly render market images.
        'leaflet_root_url' => array(
          'type' => 'inline',
          'data' => 'L_ROOT_URL = "' . base_path() . libraries_get_path('leaflet') . '/";',
          'group' => JS_LIBRARY,
        ),
        'leaflet.js' => array(
          'type' => 'file',
          'group' => JS_LIBRARY,
        ),
        // For AdvAgg module. See [#2294639] This runs after leaflet.js.
        'leaflet_imagepath' => array(
          'type' => 'inline',
          // Note: ends with "/"
          'data' => 'L.Icon.Default.imagePath = "' . base_path() . libraries_get_path('leaflet') . '/images/";',
        ),
      ),
      'css' => array(
        'leaflet.css' => array(
          'type' => 'file',
          'media' => 'all',
        ),
        'leaflet.ie.css' => array(
          'browsers' => array(
            'IE' => 'lte IE 8',
            '!IE' => FALSE,
          ),
        ),
      ),
    ),
    'integration files' => array(
      'leaflet' => array(
        'js' => array('leaflet.drupal.js'),
      ),
    ),
  );

  return $libraries;
}

/**
 * Attach Leaflet-required client files and return renderable array for a map.
 *
 * @param array $map
 *   Map definition as returned my leaflet_map_get_info();
 * @param array $features
 *   Associative array of map features.
 * @param string $height
 *   The height of the map.
 *
 * @return array
 *   A renderable array.
 */
function leaflet_build_map($map, $features = array(), $height = '400px') {
  // [#2777321] With two maps on 1 page, drupal_html_id() sometimes fails to
  // return a unique id. Make it so.
  $map_id = drupal_html_id('leaflet_map') . '-' . rand();
  $build = array(
    '#theme' => 'html_tag',
    '#tag' => 'div',
    '#value' => '',
    '#attributes' => array(
      'id' => $map_id,
      'style' => 'height: ' . $height,
    ),
  );

  // Allow map definitions to provide a default icon:
  if (isset($map['icon']['iconUrl'])) {
    foreach ($features as &$feature) {
      if (!isset($feature['icon'])) {
        $feature['icon'] = $map['icon'];
      }
    }
  }

  $settings = array(
    'mapId' => $map_id,
    'map' => $map,
    'features' => $features,
  );
  drupal_alter('leaflet_map_prebuild', $settings);

  $build['#attached']['js'][] = array(
    'data' => array('leaflet' => array($settings)),
    'type' => 'setting',
  );
  $build['#attached']['css'][] = array(
    'data' => drupal_get_path('module', 'leaflet') . '/leaflet_extras.css',
  );

  // Load the leaflet library, which includes integration files.
  // libraries_load('leaflet');
  // See [2460643]
  $build['#attached']['libraries_load'][] = array('leaflet');

  // Let other modules properly attach libraries as well [#2567387]
  drupal_alter('leaflet_build_map', $build);

  return $build;
}

/**
 * DEPRECATED. Use leaflet_build_map() instead.
 *
 * Load all Leaflet required client files and return markup for a map.
 *
 * @param array $map
 *   Map definition as returned my leaflet_map_get_info();
 * @param array $features
 *   Associative array of map features.
 * @param string $height
 *   The height of the map.
 *
 * @return string
 *   map markup
 */
function leaflet_render_map($map, $features = array(), $height = '400px') {
  $build = leaflet_build_map($map, $features, $height);
  return render($build);
}

/**
 * Get all available Leaflet map definitions.
 *
 * @string $map
 *   The name of the map defined in hook_leaflet_map_get_info().
 */
function leaflet_map_get_info($map = NULL) {
  static $drupal_static_fast;
  if (!isset($drupal_static_fast)) {
    $drupal_static_fast['leaflet_map_info'] = &drupal_static(__FUNCTION__);
  }
  $map_info = &$drupal_static_fast['leaflet_map_info'];

  if (empty($map_info)) {
    if ($cache = cache_get("leaflet_map_info")) {
      $map_info = $cache->data;
    }
    else {
      $map_info = module_invoke_all('leaflet_map_info');

      // Let other modules alter the map info.
      drupal_alter('leaflet_map_info', $map_info);

      cache_set("leaflet_map_info", $map_info);
    }
  }

  if (empty($map)) {
    return $map_info;
  }
  elseif (isset($map_info[$map])) {
    return $map_info[$map];
  }
}

/**
 * Implements hook_leaflet_map_info().
 *
 * Return a default map for the module.
 */
function leaflet_leaflet_map_info() {
  return array(
    'OSM Mapnik' =>
      array(
        'label' => 'OSM Mapnik',
        'description' => t('Leaflet default map.'),
        // 'center' is used when map contains no features, or every time the map
        // is loaded if "force" is TRUE. Otherwise, the map will center itself
        // intelligently based on the features in the map.
        // RdB: bad things happen when 'center' is specified and Leaflet
        // MarkerCluster is used, see https://drupal.org/node/2144935
        // Also, a hard-coded center is not a great idea.
        //'center' => array(
        //  'lat' => 45.526513,
        //  'lon' => -122.674833,
        //  'force' => FALSE,
        //),
        'settings' => array(
          // Setting "zoom" forces a zoom level on every map load.
          //'zoom' => 17,
          // The "zoomDefault" is only used when no features are present.
          'zoomDefault' => 10,
          'minZoom' => 0,
          'maxZoom' => 18,
          'dragging' => TRUE,
          'touchZoom' => TRUE,
          'scrollWheelZoom' => TRUE,
          'doubleClickZoom' => TRUE,
          'zoomControl' => TRUE,
          'attributionControl' => TRUE,
          'trackResize' => TRUE,
          'fadeAnimation' => TRUE,
          'zoomAnimation' => TRUE,
          'closePopupOnClick' => TRUE,
        ),
        'layers' => array(
          'earth' => array(
            'urlTemplate' => '//{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
            'options' => array(
              'attribution' => 'OSM Mapnik',
            ),
          ),
        ),
      ),
  );
}