<?php

declare(strict_types=1);

namespace Drupal\islandora_inplace_media\Form;

use Drupal\Core\StreamWrapper\StreamWrapperInterface;
use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\islandora_inplace_media\Utils;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Drupal\Core\Url;
use Drupal\Core\StreamWrapper\StreamWrapperManagerInterface;
use Drupal\field\Entity\FieldConfig;

/**
 * Provides an Islandora Inplace Media form.
 */
final class CreateMediaFromFileForm extends FormBase {

  /**
   * The Inplace Media Utils service.
   *
   * @var \Drupal\islandora_inplace_media\Utils
   */
  protected Utils $mediaUtils;

  /**
   * The entity type manager service.
   *
   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
   */
  protected $entityTypeManager;

  /**
   * The stream wrapper service.
   *
   * @var \Drupal\Core\StreamWrapper\StreamWrapperManagerInterface
   */

  protected $streamWrapperManager;

  /**
   * Media field mapping.
   *
   * @var array
   */
  protected $fileTypes = [
    'audio' => 'field_media_audio_file',
    'document' => 'field_media_document',
    'file' => 'field_media_file',
    'image' => 'field_media_image',
    'video' => 'field_media_video_file',
  ];

  /**
   * {@inheritdoc}
   */
  public function __construct(Utils $mediaUtils, EntityTypeManagerInterface $entityTypeManager, StreamWrapperManagerInterface $streamWrapperManager) {
    $this->mediaUtils = $mediaUtils;
    $this->entityTypeManager = $entityTypeManager;
    $this->streamWrapperManager = $streamWrapperManager;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container): self {
    return new self(
      $container->get('islandora_inplace_media.utils'),
      $container->get('entity_type.manager'),
      $container->get('stream_wrapper_manager')
    );
  }

  /**
   * {@inheritdoc}
   */
  public function getFormId(): string {
    return 'islandora_inplace_media_create_media_from_file';
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state): array {
    $server_software = $_SERVER['SERVER_SOFTWARE'] ?? '';
    $default_ownership = match (TRUE) {
      str_contains($server_software, 'apache') => 'www-data:www-data',
      str_contains($server_software, 'nginx') => 'nginx:nginx',
      default => 'unknown:unknown',
    };

    $vid = 'islandora_media_use';
    $terms = $this->entityTypeManager->getStorage('taxonomy_term')->loadTree($vid);
    $media_use_options = [];
    $term_default = '';
    foreach ($terms as $term) {
      $media_use_options[$term->tid] = $term->name;
      if ($term->name == 'Original File') {
        $term_default = $term->tid;
      }
    }

    $wrappers = $this->streamWrapperManager->getWrappers();
    $file_system_options = [];
    $file_system_options['default'] = $this->t("File system defined in media type");

    $unwanted = ['temporary', 'assets', 'temporary', 'library-definitions', 'asset', 'php-file'];
    foreach ($wrappers as $scheme => $wrapper_info) {
      if (in_array($scheme, $unwanted)) {
        continue;
      }

      try {
        $instance = $this->streamWrapperManager->getViaScheme($scheme);
        $file_system_options[$scheme] = $instance->getName() ?: $scheme;
      }
      catch (\Exception $e) {
        // Log or ignore missing/broken stream wrapper
      }

    }

    $media_types = $this->entityTypeManager->getStorage('media_type')->loadMultiple();
    $types = array_map(fn($media_type) => $media_type->label(), $media_types);
    $form['instructions'] = [
      '#type' => 'link',
      '#title' => $this->t('View Instructions'),
      '#url' => Url::fromRoute('islandora_inplace_media.instructions_modal'),
      '#attributes' => [
        'class' => ['use-ajax', 'button', 'button--small'],
        'data-dialog-type' => 'modal',
        'data-dialog-options' => json_encode([
          'width' => 700,
        ]),
      ],
      '#attached' => [
        'library' => [
          'core/drupal.dialog.ajax',
        ],
      ],
    ];
    $form['in_place'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Already in place?'),
      '#description' => $this->t("Check this box if files are already in the file system directory."),
    ];

    $form['source'] = [
      '#type' => 'textfield',
      '#title' => $this->t('Enter the full file path to the input directory'),
      '#states' => [
        'visible' => [
          ':input[name="in_place"]' => ['checked' => FALSE],
        ],
        'required' => [
          ':input[name="in_place"]' => ['checked' => FALSE],
        ],
      ],
    ];

    $form['destination'] = [
      '#type' => 'textfield',
      '#title' => $this->t('Enter the directory on the file system'),
      '#required' => TRUE,
    ];
    $form['file_system'] = [
      '#type' => 'radios',
      '#options' => $file_system_options,
      '#title' => $this->t('Select file system'),
      '#required' => TRUE,
      '#default_value' => 'default',
    ];
    if (count($file_system_options) <= 1) {
      $form['file_system']['#attributes']['style'] = 'display: none;';
    }
    $form['field_wrapper'] = [
      '#type' => 'container',
      '#attributes' => ['class' => ['media-fields-wrapper']],
    ];
    $form['field_wrapper']['media_type_wrapper'] = [
      '#type' => 'container',
      '#attributes' => ['class' => ['media-field-container']],
    ];
    $form['field_wrapper']['media_type_wrapper']['media_type'] = [
      '#title' => $this->t("Media type."),
      '#type' => 'select',
      '#options' => $types,
      '#attributes' => ['class' => ['media-side-by-side']],
    ];
    $form['field_wrapper']['media_use_wrapper'] = [
      '#type' => 'container',
      '#attributes' => ['class' => ['media-field-container']],
    ];
    $form['field_wrapper']['media_use_wrapper']['media_use'] = [
      '#title' => $this->t("Media use."),
      '#type' => 'select',
      '#options' => $media_use_options,
      '#default_value' => $term_default,
      '#attributes' => ['class' => ['media-side-by-side']],
    ];
    $form['field_wrapper']['ownership_wrapper'] = [
      '#type' => 'container',
      '#attributes' => ['class' => ['media-field-container']],
    ];
    $form['field_wrapper']['ownership_wrapper']['ownership'] = [
      '#type' => 'textfield',
      '#title' => $this->t('File ownership'),
      '#default_value' => $default_ownership,
      '#attributes' => ['class' => ['media-side-by-side']],
    ];

    $form['actions'] = [
      '#type' => 'actions',
      'submit' => [
        '#type' => 'submit',
        '#value' => $this->t('Send'),
      ],
    ];
    $form['#attached']['library'][] = 'islandora_inplace_media/form_styles';

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function validateForm(array &$form, FormStateInterface $form_state): void {
    $file_system = $this->getFilesystem($form_state);
    $source_directory = rtrim($form_state->getValue('in_place') ? $file_system . $form_state->getValue('destination') : $form_state->getValue('source'), '/');

    if (!is_dir($source_directory)) {
      if (str_starts_with($file_system, 'fedora')) {
        $form_state->setErrorByName('source', $this->t('The fedora file system is not suitable for preloading files.'));
      }
      else {
        $form_state->setErrorByName('source', $this->t('The specified directory does not exist.'));
      }
      return;
    }

    if (empty(array_diff(scandir($source_directory), ['.', '..']))) {
      $form_state->setErrorByName('source', $this->t('The specified directory is empty.'));
    }
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state): void {
    $file_system = $this->getFilesystem($form_state);
    $media_type = $form_state->getValue('media_type');
    $destination = trim($form_state->getValue('destination'), '/');

    $build_data = [
      'source_dir' => $form_state->getValue('in_place') ? $file_system . $destination : $form_state->getValue('source'),
      'destination_path' => "{$file_system}{$destination}",
      'media_type' => $form_state->getValue('media_type'),
      'file_type' => $this->fileTypes[$media_type],
      'media_use' => $form_state->getValue('media_use'),
      'ownership' => $form_state->getValue('ownership'),
    ];
    $this->mediaUtils->buildMediaBatch($build_data);
    if ($form_state->getValue('in_place')) {
      $status = $this->t('Media files in %destination have been processed', [
        '%destination' => $destination,
      ]);
    }
    else {
      $status = $this->t('Media files have been processed from %source to %destination.', [
        '%source' => $build_data['source_dir'],
        '%destination' => $build_data['destination_path'],
      ]);
    }
    $this->messenger()->addStatus($status);
    $form_state->setRedirect('<front>');
  }

  /**
   * Gets default filesystem for media type.
   */
  protected function getFilesystem($form_state) {
    $media_type = $form_state->getValue('media_type');
    $file_type = $this->fileTypes[$media_type];

    if ($form_state->getValue('file_system') == 'default') {
      $field_config = FieldConfig::loadByName('media', $media_type, $file_type);
      if ($field_config) {
        $settings = $field_config->getSettings();
        $scheme = $settings['uri_scheme'] ?? 'public';
        $file_system = $scheme . "://";
      }
    }
    else {
      $file_system = $form_state->getValue('file_system') . "://";
    }
    return $file_system;

  }

}