<?php

/**
 * Implementation of hook_views_api().
 * magic function that loads module.views.inc
 */
function gm3_views_api(){
  return array(
    'api' => 3
  );
}

/**
 * Implementation of hook_library().
 */
function gm3_library(){
  return array(
    'gm3' => array(
      'title' => t('Javascript maps'),
      'js' => array(
        [
          // Main Leaflet library
          'data' => 'https://unpkg.com/leaflet@1.4.0/dist/leaflet.js',
          'options' => 'external'
        ],
        [
          // Intersection observer pollyfill for browsers that don't support it (IE, Safari <12)
          'data' => drupal_get_path('module', 'gm3') . '/js/libs/intersection-observer.js',
          'options' => 'external',
          'preprocess' => FALSE
        ],
        [
          // Helpers to edit map shapes graphically
          'data' => drupal_get_path('module', 'gm3') . '/js/libs/Leaflet.Editable.js',
          'options' => 'external',
          'preprocess' => FALSE
        ],
        [
          // Create the map and add the libraries
          'data' => drupal_get_path('module', 'gm3') . "/js/gm3.js"
        ],
        [
          // Base class that most of the gm3 libraries inherit from
          'data' => drupal_get_path('module', 'gm3') . "/js/gm3.library.js"
        ],
        array(
          'data' => array(
            'gm3' => array(
              'settings' => array(
                'images' => array(
                  'sprite' => file_create_url(drupal_get_path('module', 'gm3') . '/images/sprite.png')
                )
              )
            )
          ),
          'type' => 'setting'
        )
      ),
      'css' => array(
        [
          'data' => 'https://unpkg.com/leaflet@1.4.0/dist/leaflet.css'
        ]
      )
    ),
    'gm3.gl' => [
      'title' => t('WebGL maps libraries'),
      'js' => [
        [
          // Mapbox library for rendering Web GL maps
          'data' => 'https://cdn.maptiler.com/mapbox-gl-js/v0.53.0/mapbox-gl.js',
          'options' => 'external'
        ],
        [
          // Leaflet plugin for adding Web GL maps as a layer
          'data' => 'https://cdn.maptiler.com/mapbox-gl-leaflet/latest/leaflet-mapbox-gl.js',
          'options' => 'external'
        ],
        [
          // Library for changing the mapbox map language
          'data' => 'https://cdn.klokantech.com/openmaptiles-language/v1.0/openmaptiles-language.js',
          'options' => 'external'
        ]
      ],
      'css' => [
        [
          'data' => 'https://cdn.maptiler.com/mapbox-gl-js/v0.53.0/mapbox-gl.css',
          'options' => 'external'
        ]
      ],
      'dependencies' => [
        ['gm3', 'gm3']
      ]
    ],
    // Enable the clicking of points.
    'gm3.point' => array(
      'title' => t('Javascript Maps: Point drawing'),
      'js' => array(
        [
          // Plugin for clusting points together
          'data' => 'https://unpkg.com/leaflet.markercluster@1.4.1/dist/leaflet.markercluster.js',
          'options' => 'external'
        ],
        [
          'data' => drupal_get_path('module', 'gm3') . "/js/gm3.point.js"
        ]
      ),
      'css' => [
        [
          'data' => 'https://unpkg.com/leaflet.markercluster@1.4.1/dist/MarkerCluster.css',
          'options' => 'external'
        ],
        [
          'data' => 'https://unpkg.com/leaflet.markercluster@1.4.1/dist/MarkerCluster.Default.css',
          'options' => 'external'
        ],
      ],
      'dependencies' => array(
        array(
          'gm3',
          'gm3'
        )
      )
    ),
    'gm3.shape' => [
      'title' => t('Javascript Maps: Base shape library'),
      'js' => [
        // Base class that polyline, polygon, rectangle inherit from
        'data' => drupal_get_path('module', 'gm3') . "/js/gm3.shape.js"
      ],
      'dependencies' => [
        ['gm3', 'gm3']
      ]
    ],
    // Enable drawing of Polygons.
    'gm3.polygon' => array(
      'title' => t('Javascript Maps: Polygon drawing'),
      'js' => array(
        array(
          'data' => drupal_get_path('module', 'gm3') . "/js/gm3.polygon.js"
        )
      ),
      'dependencies' => array(
        [
          'gm3',
          'gm3.shape'
        ]
      )
    ),
    // Enable the drawing of rectangles.
    'gm3.rectangle' => array(
      'title' => t('Javascript Maps: Rectangle drawing'),
      'js' => array(
        array(
          'data' => drupal_get_path('module', 'gm3') . "/js/gm3.rectangle.js"
        )
      ),
      'dependencies' => array(
        [
          'gm3',
          'gm3.shape'
        ]
      )
    ),
    // Enable the drawing of Lines.
    'gm3.polyline' => array(
      'title' => t('Javascript Maps: Polygon drawing'),
      'js' => array(
        array(
          'data' => drupal_get_path('module', 'gm3') . "/js/gm3.polyline.js"
        )
      ),
      'dependencies' => array(
        [
          'gm3',
          'gm3.shape'
        ]
      )
    )
  );
}

/**
 * Implementation of hook_theme().
 */
function gm3_theme(){
  return array(
    'gm3_map' => array(
      'variables' => array(
        'id' => 'gm3-map',
        'libraries' => [],
        'tools' => false,
        'settings' => []
      ),
      'file' => 'gm3.theme.inc'
    ),
    'gm3_view_gm3' => array(
      'variables' => array(),
      'file' => 'gm3.theme.inc'
    ),
    'gm3_point_button' => array(
      'variables' => array(
        'id' => 'gm3-map'
      ),
      'file' => 'gm3.theme.inc'
    ),
    'gm3_polygon_button' => array(
      'variables' => array(
        'id' => 'gm3-map'
      ),
      'file' => 'gm3.theme.inc'
    ),
    'gm3_rectangle_button' => array(
      'variables' => array(
        'id' => 'gm3-map'
      ),
      'file' => 'gm3.theme.inc'
    ),
    'gm3_polyline_button' => array(
      'variables' => array(
        'id' => 'gm3-map'
      ),
      'file' => 'gm3.theme.inc'
    ),
    'gm3_beautytip' => array(
      'variables' => array(
        'selector' => '',
        'text' => ''
      ),
      'file' => 'gm3.theme.inc'
    )
  );
}

/**
 * Implements hook_form_FORM_ID_alter().
 *
 * This function ensures the user can only select the "Fields" type for a
 * map view.
 */
function gm3_form_views_ui_add_form_alter(&$form, &$form_state, $form_id){
  foreach(array(
    'page',
    'block'
  ) as $type){
    if(@isset($form_state['values'][$type]['style']['style_plugin']) && $form_state['values'][$type]['style']['style_plugin'] == 'gmap'){
      $form['displays'][$type]['options']['style']['row_plugin'] = array(
        '#markup' => '<span>' . t('of fields') . '</span>'
      );
      unset($form['displays'][$type]['options']['style']['row_options']['comments']);
      unset($form['displays'][$type]['options']['style']['row_options']['links']);
    }
  }
}

/**
 * Load the geoPHP library.  This could be made optional, as not all features
 * require the library.
 *
 * This code is adapted from the geofield module.
 */
function gm3_load_geophp(){
  static $filename = FALSE;
  if(!$filename){
    // Folk can install geoPHP using a "libraries" path, or simply shove it in
    // the gm3 module folder.
    if(function_exists('libraries_get_path')){
      $library_folder = libraries_get_path('geoPHP');
      if(!$library_folder){
        $library_folder = libraries_get_path('geophp');
      }
      $file = $library_folder . '/geoPHP.inc';
    }else{
      $file = drupal_get_path('module', 'gm3') . '/geoPHP/geoPHP.inc';
    }
    if(file_exists($file)){
      if(include_once ($file)){
        $filename = $file;
      }
    }
  }
  return $filename;
}

/**
 * Implements hook_permissions
 */
function gm3_permission(){
  return array(
    'administer gm3' => array(
      'title' => t('Administer GM3'),
      'description' => t('Administer the Javascript Maps Module.')
    )
  );
}

/**
 * Implementation of hook_menu().
 */
function gm3_menu(){
  return array(
    'admin/config/content/gm3' => array(
      'title' => 'Map settings',
      'description' => 'Configure default behavior of the Javascript Map module.',
      'page callback' => 'drupal_get_form',
      'page arguments' => array(
        'gm3_admin_settings_form'
      ),
      'access arguments' => array(
        'administer gm3'
      ),
      'file' => 'gm3.admin.inc'
    ),
    'admin/config/content/gm3/settings' => array(
      'title' => 'Settings',
      'type' => MENU_DEFAULT_LOCAL_TASK,
      'weight' => -10
    ),
    'admin/config/content/gm3/test' => array(
      'title' => 'Test',
      'description' => t('Map test page - ensure the GM3 module is working correctly on your site.'),
      'page callback' => 'gm3_test_page',
      'file' => 'gm3.admin.inc',
      'access arguments' => array(
        'administer gm3'
      ),
      'type' => MENU_LOCAL_TASK
    )
  );
}

/**
 * Get the default settings for Leaflet maps
 */
function gm3_settings(){
  $saved_settings = variable_get('gm3_default_settings', []);

  return $saved_settings + [
    'width' => '100%',
    'height' => '500px',
    'center' => [
      'latitude' => 52,
      'longitude' => 0
    ],
    'zoom' => 5,
    'maxZoom' => null,
    'minZoom' => null,
    'autoZoom' => TRUE,
    'enableClustering' => true,
    'mapStyle' => 'default',
    'mapTilerKey' => variable_get('gm3_tile_key', 'a7gYjHDMqIbwzM1ifyNh')
  ];
}

/**
 * Invokes hook_TYPE_map_alter functions to add an item to the map
 * If item has no gm3_type property describing the field/data type,
 * you must supply it as the third argument.
 * @return True if a hook modified the map, else false
 */
function gm3_invoke_map_alter(&$map, $item, $gm3_type = null) {
  $gm3_type = $gm3_type ?? $item['gm3_type'];
  $type = array_pop(explode("_", $gm3_type));
  // Call hook_TYPE_map_alter functions
  $alter_hook = "${type}_map";
  drupal_alter($alter_hook, $map, $item);
  return isset($map['libraries'][$type]);
}