<?php

namespace Drupal\user\Entity;

use Drupal\Core\Config\Entity\ConfigEntityBase;
use Drupal\Core\Entity\EntityStorageInterface;
use Drupal\user\RoleInterface;

/**
 * Defines the user role entity class.
 *
 * @ConfigEntityType(
 *   id = "user_role",
 *   label = @Translation("Role"),
 *   label_collection = @Translation("Roles"),
 *   label_singular = @Translation("role"),
 *   label_plural = @Translation("roles"),
 *   label_count = @PluralTranslation(
 *     singular = "@count role",
 *     plural = "@count roles",
 *   ),
 *   handlers = {
 *     "storage" = "Drupal\user\RoleStorage",
 *     "access" = "Drupal\user\RoleAccessControlHandler",
 *     "list_builder" = "Drupal\user\RoleListBuilder",
 *     "form" = {
 *       "default" = "Drupal\user\RoleForm",
 *       "delete" = "Drupal\Core\Entity\EntityDeleteForm"
 *     }
 *   },
 *   admin_permission = "administer permissions",
 *   config_prefix = "role",
 *   static_cache = TRUE,
 *   entity_keys = {
 *     "id" = "id",
 *     "weight" = "weight",
 *     "label" = "label"
 *   },
 *   links = {
 *     "delete-form" = "/admin/people/roles/manage/{user_role}/delete",
 *     "edit-form" = "/admin/people/roles/manage/{user_role}",
 *     "edit-permissions-form" = "/admin/people/permissions/{user_role}",
 *     "collection" = "/admin/people/roles",
 *   },
 *   config_export = {
 *     "id",
 *     "label",
 *     "weight",
 *     "is_admin",
 *     "permissions",
 *   }
 * )
 */
class Role extends ConfigEntityBase implements RoleInterface {

  /**
   * The machine name of this role.
   *
   * @var string
   */
  protected $id;

  /**
   * The human-readable label of this role.
   *
   * @var string
   */
  protected $label;

  /**
   * The weight of this role in administrative listings.
   *
   * @var int
   */
  protected $weight;

  /**
   * The permissions belonging to this role.
   *
   * @var array
   */
  protected $permissions = [];

  /**
   * An indicator whether the role has all permissions.
   *
   * @var bool
   */
  protected $is_admin;

  /**
   * {@inheritdoc}
   */
  public function getPermissions() {
    if ($this->isAdmin()) {
      return [];
    }
    return $this->permissions;
  }

  /**
   * {@inheritdoc}
   */
  public function getWeight() {
    return $this->get('weight');
  }

  /**
   * {@inheritdoc}
   */
  public function setWeight($weight) {
    $this->set('weight', $weight);
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function hasPermission($permission) {
    if ($this->isAdmin()) {
      return TRUE;
    }
    return in_array($permission, $this->permissions);
  }

  /**
   * {@inheritdoc}
   */
  public function grantPermission($permission) {
    if ($this->isAdmin()) {
      return $this;
    }
    if (!$this->hasPermission($permission)) {
      $this->permissions[] = $permission;
    }
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function revokePermission($permission) {
    if ($this->isAdmin()) {
      return $this;
    }
    $this->permissions = array_diff($this->permissions, [$permission]);
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function isAdmin() {
    return (bool) $this->is_admin;
  }

  /**
   * {@inheritdoc}
   */
  public function setIsAdmin($is_admin) {
    $this->is_admin = $is_admin;
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public static function postLoad(EntityStorageInterface $storage, array &$entities) {
    parent::postLoad($storage, $entities);
    // Sort the queried roles by their weight.
    // See \Drupal\Core\Config\Entity\ConfigEntityBase::sort().
    uasort($entities, [static::class, 'sort']);
  }

  /**
   * {@inheritdoc}
   */
  public function preSave(EntityStorageInterface $storage) {
    parent::preSave($storage);

    if (!isset($this->weight) && ($roles = $storage->loadMultiple())) {
      // Set a role weight to make this new role last.
      $max = array_reduce($roles, function ($max, $role) {
        return $max > $role->weight ? $max : $role->weight;
      });
      $this->weight = $max + 1;
    }

    if (!$this->isSyncing() && $this->hasTrustedData()) {
      // Permissions are always ordered alphabetically to avoid conflicts in the
      // exported configuration. If the save is not trusted then the
      // configuration will be sorted by StorableConfigBase.
      sort($this->permissions);
    }
  }

  /**
   * {@inheritdoc}
   */
  public function calculateDependencies() {
    parent::calculateDependencies();
    // Load all permission definitions.
    $permission_definitions = \Drupal::service('user.permissions')->getPermissions();
    $valid_permissions = array_intersect($this->permissions, array_keys($permission_definitions));
    $invalid_permissions = array_diff($this->permissions, $valid_permissions);
    if (!empty($invalid_permissions)) {
      throw new \RuntimeException('Adding non-existent permissions to a role is not allowed. The incorrect permissions are "' . implode('", "', $invalid_permissions) . '".');
    }
    foreach ($valid_permissions as $permission) {
      // Depend on the module that is providing this permissions.
      $this->addDependency('module', $permission_definitions[$permission]['provider']);
      // Depend on any other dependencies defined by permissions granted to
      // this role.
      if (!empty($permission_definitions[$permission]['dependencies'])) {
        $this->addDependencies($permission_definitions[$permission]['dependencies']);
      }
    }
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function onDependencyRemoval(array $dependencies) {
    $changed = parent::onDependencyRemoval($dependencies);
    // Load all permission definitions.
    $permission_definitions = \Drupal::service('user.permissions')->getPermissions();

    // Convert config and content entity dependencies to a list of names to make
    // it easier to check.
    foreach (['content', 'config'] as $type) {
      $dependencies[$type] = array_keys($dependencies[$type]);
    }

    // Remove any permissions from the role that are dependent on anything being
    // deleted or uninstalled.
    foreach ($this->permissions as $key => $permission) {
      if (!isset($permission_definitions[$permission])) {
        // If the permission is not defined then there's nothing we can do.
        continue;
      }

      if (in_array($permission_definitions[$permission]['provider'], $dependencies['module'], TRUE)) {
        unset($this->permissions[$key]);
        $changed = TRUE;
        // Process the next permission.
        continue;
      }

      if (isset($permission_definitions[$permission]['dependencies'])) {
        foreach ($permission_definitions[$permission]['dependencies'] as $type => $list) {
          if (array_intersect($list, $dependencies[$type])) {
            unset($this->permissions[$key]);
            $changed = TRUE;
            // Process the next permission.
            continue 2;
          }
        }
      }
    }

    return $changed;
  }

}
