<?php
/**
 * @file
 * Environment Field Access.
 */

/**
 * Implements hook_fieldaccess_info().
 */
function environment_fieldaccess_fieldaccess_info() {
  $label = t('Access field depending on environment');
  $info = [];

  foreach (['edit', 'view'] as $type) {
    $data = [
      'type' => $type,
      'label' => $label,
    ];

    foreach (['configure', 'grant'] as $func) {
      $data += [
        "{$func}" => "environment_fieldaccess_$func",
        "{$func}_file" => "environment_fieldaccess.$func.inc",
      ];
    }

    $info["environment_fieldaccess_$type"] = $data;
  }

  return $info;
}

/**
 * Get instance of current site.
 *
 * @param array $settings
 *   Configured settings.
 * @param bool $get
 *   Get values.
 *
 * @return array
 *   Form definition or, if second argument is TRUE - configured values.
 */
function _environment_fieldaccess_settings(array $settings, $get = FALSE) {
  $environments = $elements = $values = [];

  if (!$get) {
    foreach (environment_load() as $environment => $definition) {
      $environments[$environment] = $definition['label'];
    }
  }

  $elements['environment'] = [
    '#type' => 'select',
    '#title' => t('Allow access for selected environments'),
    '#options' => $environments,
    '#multiple' => TRUE,
    '#default_value' => '',
  ];

  $elements['not'] = [
    '#type' => 'checkbox',
    '#title' => t('Reverse (NOT)'),
    '#default_value' => 0,
  ];

  foreach ($elements as $element => &$definition) {
    // Updated default value from settings.
    if (isset($settings[$element])) {
      $definition['#default_value'] = $settings[$element];
    }

    // Collect form values.
    $values[$element] = isset($definition['#default_value']) ? $definition['#default_value'] : NULL;
  }

  return $get ? $values : $elements;
}