<?php

/**
 * @file
 * Módulo Site Users - customizações de usuários do site.
 */

use Drupal\Core\Access\AccessResult;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Entity\Display\EntityViewDisplayInterface;
use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\media\MediaInterface;
use Drupal\user\UserInterface;

/**
 * Implements hook_theme().
 */
function site_users_theme($existing, $type, $theme, $path) {
  return [
    'user__full' => [
      'template' => 'user--full',
      'base hook' => 'user',
    ],
    'site_users_info_block' => [
      'template' => 'site-user-info-block',
      'variables' => [
        'user_info' => [],
        'user' => NULL,
      ],
    ],
  ];
}

/**
 * Implements hook_theme_suggestions_HOOK_alter() for user templates.
 */
function site_users_theme_suggestions_user_alter(array &$suggestions, array $variables) {
  $view_mode = $variables['elements']['#view_mode'] ?? 'default';
  $suggestions[] = 'user__' . $view_mode;
}

/**
 * Implements hook_entity_field_access().
 */
function site_users_entity_field_access($operation, FieldDefinitionInterface $field_definition, AccountInterface $account, ?FieldItemListInterface $items = NULL) {
  // Apenas para entidade user.
  if ($field_definition->getTargetEntityTypeId() !== 'user') {
    return AccessResult::neutral();
  }

  // Lista de campos controlados pelo módulo.
  $profile_fields = [
    'field_user_name',
    'field_user_phone',
    'field_user_category',
    'field_user_dept_code',
    'field_user_bio',
  ];

  $photo_fields = [
    'field_user_photos',
    'field_user_default_photo',
  ];
  $field_name = $field_definition->getName();

  // Verificar se é um campo de perfil.
  if (in_array($field_name, $profile_fields)) {
    return site_users_check_profile_field_access($operation, $account, $items);
  }

  // Verificar se é um campo de fotos.
  if (in_array($field_name, $photo_fields)) {
    return site_users_check_photo_field_access($operation, $account, $items);
  }

  return AccessResult::neutral();
}

/**
 * Verifica acesso aos campos de perfil.
 */
function site_users_check_profile_field_access($operation, AccountInterface $account, ?FieldItemListInterface $items = NULL) {
  // Administradores têm acesso total.
  if ($account->hasPermission('administer site_users settings')) {
    return AccessResult::allowed()->cachePerPermissions();
  }

  // Determinar se é o próprio usuário.
  $is_own = FALSE;
  if ($items) {
    $entity = $items->getEntity();
    $is_own = ($entity->id() == $account->id());
  }

  if ($operation === 'view') {
    // Pode ver qualquer perfil.
    if ($account->hasPermission('view any user profile fields')) {
      return AccessResult::allowed()->cachePerPermissions();
    }
    // Pode ver apenas o próprio perfil.
    if ($is_own && $account->hasPermission('view own user profile fields')) {
      return AccessResult::allowed()->cachePerPermissions()->cachePerUser();
    }
    return AccessResult::forbidden()->cachePerPermissions()->cachePerUser();
  }

  if ($operation === 'edit') {
    // Pode editar qualquer perfil.
    if ($account->hasPermission('edit any user profile fields')) {
      return AccessResult::allowed()->cachePerPermissions();
    }
    // Pode editar apenas o próprio perfil.
    if ($is_own && $account->hasPermission('edit own user profile fields')) {
      return AccessResult::allowed()->cachePerPermissions()->cachePerUser();
    }
    return AccessResult::forbidden()->cachePerPermissions()->cachePerUser();
  }

  return AccessResult::neutral();
}

/**
 * Verifica acesso ao campo de fotos.
 */
function site_users_check_photo_field_access($operation, AccountInterface $account, ?FieldItemListInterface $items = NULL) {
  // Administradores têm acesso total.
  if ($account->hasPermission('administer site_users settings')) {
    return AccessResult::allowed()->cachePerPermissions();
  }

  // Determinar se é o próprio usuário.
  $is_own = FALSE;
  if ($items) {
    $entity = $items->getEntity();
    $is_own = ($entity->id() == $account->id());
  }

  if ($operation === 'view') {
    // Fotos seguem a mesma regra dos campos de perfil para visualização.
    if ($account->hasPermission('view any user profile fields')) {
      return AccessResult::allowed()->cachePerPermissions();
    }
    if ($is_own && $account->hasPermission('view own user profile fields')) {
      return AccessResult::allowed()->cachePerPermissions()->cachePerUser();
    }
    return AccessResult::forbidden()->cachePerPermissions()->cachePerUser();
  }

  if ($operation === 'edit') {
    // Pode gerenciar fotos de qualquer usuário.
    if ($account->hasPermission('manage user photos')) {
      return AccessResult::allowed()->cachePerPermissions();
    }
    // Pode gerenciar apenas as próprias fotos.
    if ($is_own && $account->hasPermission('manage own user photos')) {
      return AccessResult::allowed()->cachePerPermissions()->cachePerUser();
    }
    return AccessResult::forbidden()->cachePerPermissions()->cachePerUser();
  }

  return AccessResult::neutral();
}

/**
 * Implements hook_form_FORM_ID_alter() for user_form.
 */
function site_users_form_user_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  if (isset($form['field_user_photos'])) {
    $form['#validate'][] = 'site_users_validate_photos_count';
    _site_users_add_default_photo_selector($form, $form_state);
  }
}

/**
 * Implements hook_form_FORM_ID_alter() for user_register_form.
 */
function site_users_form_user_register_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  if (isset($form['field_user_photos'])) {
    $form['#validate'][] = 'site_users_validate_photos_count';
    _site_users_add_default_photo_selector($form, $form_state);
  }
}

/**
 * Adiciona o seletor de foto padrão ao formulário.
 */
function _site_users_add_default_photo_selector(&$form, FormStateInterface $form_state) {
  /** @var \Drupal\user\UserInterface $user */
  $user = $form_state->getFormObject()->getEntity();

  // Obter fotos atuais do usuário.
  $photos = [];
  if ($user->hasField('field_user_photos') && !$user->get('field_user_photos')->isEmpty()) {
    foreach ($user->get('field_user_photos')->referencedEntities() as $media) {
      if ($media instanceof MediaInterface) {
        $photos[$media->id()] = $media->label();
      }
    }
  }

  // Obter foto padrão atual.
  $default_photo_id = NULL;
  if ($user->hasField('field_user_default_photo') && !$user->get('field_user_default_photo')->isEmpty()) {
    $default_photo_id = $user->get('field_user_default_photo')->target_id;
  }

  // Adicionar seletor de foto padrão após o campo de fotos.
  $form['default_photo_selector'] = [
    '#type' => 'container',
    '#weight' => $form['field_user_photos']['#weight'] + 0.5 ?? 15,
    '#states' => [
      'visible' => [
        ':input[name="field_user_photos[selection]"]' => ['filled' => TRUE],
      ],
    ],
  ];

  if (!empty($photos)) {
    $form['default_photo_selector']['field_user_default_photo_select'] = [
      '#type' => 'radios',
      '#title' => t('Default photo'),
      '#description' => t('Select the main profile photo.'),
      '#options' => $photos,
      '#default_value' => $default_photo_id,
    ];
  }
  else {
    $form['default_photo_selector']['field_user_default_photo_select'] = [
      '#type' => 'item',
      '#title' => t('Default photo'),
      '#markup' => t('Add photos to select one as default.'),
    ];
  }

  // Adicionar submit handler para salvar a foto padrão.
  $form['actions']['submit']['#submit'][] = '_site_users_save_default_photo';
}

/**
 * Submit handler para salvar a foto padrão selecionada.
 */
function _site_users_save_default_photo(&$form, FormStateInterface $form_state) {
  $selected_photo = $form_state->getValue('field_user_default_photo_select');

  /** @var \Drupal\user\UserInterface $user */
  $user = $form_state->getFormObject()->getEntity();

  if ($user->hasField('field_user_default_photo')) {
    $user->set('field_user_default_photo', $selected_photo);
    $user->save();
  }
}

/**
 * Validação customizada para quantidade máxima de fotos.
 */
function site_users_validate_photos_count(&$form, FormStateInterface $form_state) {
  $photos = $form_state->getValue('field_user_photos');

  if (empty($photos)) {
    return;
  }

  // Contar fotos selecionadas (ignorar valores vazios).
  $count = 0;
  foreach ($photos as $delta => $photo) {
    if (is_numeric($delta) && !empty($photo['target_id'])) {
      $count++;
    }
  }

  // Obter limite configurado.
  $config = \Drupal::config('site_users.settings');
  $max_count = $config->get('photos.max_count') ?? 5;

  if ($count > $max_count) {
    $form_state->setErrorByName('field_user_photos', t('You can add a maximum of @max photos. Currently @count photos are selected.', [
      '@max' => $max_count,
      '@count' => $count,
    ]));
  }
}

/**
 * Implements hook_ENTITY_TYPE_presave() for user entities.
 */
function site_users_user_presave(UserInterface $user) {
  // Garantir consistência da foto padrão.
  if (!$user->hasField('field_user_photos') || !$user->hasField('field_user_default_photo')) {
    return;
  }

  // Obter IDs das fotos atuais.
  $photo_ids = [];
  foreach ($user->get('field_user_photos')->getValue() as $item) {
    if (!empty($item['target_id'])) {
      $photo_ids[] = $item['target_id'];
    }
  }

  // Obter foto padrão atual.
  $default_photo_id = $user->get('field_user_default_photo')->target_id;

  // Se não há fotos, limpar foto padrão.
  if (empty($photo_ids)) {
    $user->set('field_user_default_photo', NULL);
    return;
  }

  // Se a foto padrão não está entre as fotos, selecionar a primeira.
  if (empty($default_photo_id) || !in_array($default_photo_id, $photo_ids)) {
    $user->set('field_user_default_photo', $photo_ids[0]);
  }
}

/**
 * Obtém a foto padrão de um usuário.
 *
 * @param \Drupal\user\UserInterface $user
 *   O usuário.
 *
 * @return \Drupal\media\MediaInterface|null
 *   A entidade de mídia da foto padrão, ou NULL se não houver.
 */
function site_users_get_default_photo(UserInterface $user): ?MediaInterface {
  if (!$user->hasField('field_user_default_photo') || !$user->hasField('field_user_photos')) {
    return NULL;
  }

  // Tentar obter a foto padrão configurada.
  if (!$user->get('field_user_default_photo')->isEmpty()) {
    $default_photo = $user->get('field_user_default_photo')->entity;
    if ($default_photo instanceof MediaInterface) {
      return $default_photo;
    }
  }

  // Fallback: retornar a primeira foto disponível.
  if (!$user->get('field_user_photos')->isEmpty()) {
    $first_photo = $user->get('field_user_photos')->first()->entity;
    if ($first_photo instanceof MediaInterface) {
      return $first_photo;
    }
  }

  return NULL;
}