<?php

/**
 * @file
 * Helper module for the file tests.
 *
 * The caller is must call file_test_reset() to initializing this module before
 * calling file_test_get_calls() or file_test_set_return().
 */

use Drupal\file\Entity\File;

const FILE_URL_TEST_CDN_1 = 'http://cdn1.example.com';
const FILE_URL_TEST_CDN_2 = 'http://cdn2.example.com';

/**
 * Reset/initialize the history of calls to the file_* hooks.
 *
 * @see file_test_get_calls()
 * @see file_test_reset()
 */
function file_test_reset() {
  // Keep track of calls to these hooks
  $results = [
    'load' => [],
    'validate' => [],
    'download' => [],
    'insert' => [],
    'update' => [],
    'copy' => [],
    'move' => [],
    'delete' => [],
  ];
  \Drupal::state()->set('file_test.results', $results);

  // These hooks will return these values, see file_test_set_return().
  $return = [
    'validate' => [],
    'download' => NULL,
  ];
  \Drupal::state()->set('file_test.return', $return);
}

/**
 * Get the arguments passed to invocation of a given hook since
 * file_test_reset() was last called.
 *
 * @param string $op
 *   One of the hook_file_* operations: 'load', 'validate', 'download',
 *   'insert', 'update', 'copy', 'move', 'delete'.
 *
 * @return array
 *   Array of the parameters passed to each call.
 *
 * @see _file_test_log_call()
 * @see file_test_reset()
 */
function file_test_get_calls($op) {
  $results = \Drupal::state()->get('file_test.results', []);
  return $results[$op];
}

/**
 * Get an array with the calls for all hooks.
 *
 * @return
 *   An array keyed by hook name ('load', 'validate', 'download', 'insert',
 *   'update', 'copy', 'move', 'delete') with values being arrays of parameters
 *   passed to each call.
 */
function file_test_get_all_calls() {
  return \Drupal::state()->get('file_test.results', []);
}

/**
 * Store the values passed to a hook invocation.
 *
 * @param string $op
 *   One of the hook_file_* operations: 'load', 'validate', 'download',
 *   'insert', 'update', 'copy', 'move', 'delete'.
 * @param array $args
 *   Values passed to hook.
 *
 * @see file_test_get_calls()
 * @see file_test_reset()
 */
function _file_test_log_call($op, $args) {
  if (\Drupal::state()->get('file_test.count_hook_invocations', TRUE)) {
    $results = \Drupal::state()->get('file_test.results', []);
    $results[$op][] = $args;
    \Drupal::state()->set('file_test.results', $results);
  }
}

/**
 * Load the appropriate return value.
 *
 * @param string $op
 *   One of the hook_file_[validate,download] operations.
 *
 * @return mixed
 *   Value set by file_test_set_return().
 *
 * @see file_test_set_return()
 * @see file_test_reset()
 */
function _file_test_get_return($op) {
  $return = \Drupal::state()->get('file_test.return', [$op => NULL]);
  return $return[$op];
}

/**
 * Assign a return value for a given operation.
 *
 * @param string $op
 *   One of the hook_file_[validate,download] operations.
 * @param mixed $value
 *   Value for the hook to return.
 *
 * @see _file_test_get_return()
 * @see file_test_reset()
 */
function file_test_set_return($op, $value) {
  $return = \Drupal::state()->get('file_test.return', []);
  $return[$op] = $value;
  \Drupal::state()->set('file_test.return', $return);
}

/**
 * Implements hook_ENTITY_TYPE_load() for file entities.
 */
function file_test_file_load($files) {
  foreach ($files as $file) {
    _file_test_log_call('load', [$file->id()]);
    // Assign a value on the object so that we can test that the $file is passed
    // by reference.
    $file->file_test['loaded'] = TRUE;
  }
}

/**
 * Implements hook_file_validate().
 */
function file_test_file_validate(File $file) {
  _file_test_log_call('validate', [$file->id()]);
  return _file_test_get_return('validate');
}

/**
 * Implements hook_file_download().
 */
function file_test_file_download($uri) {
  if (\Drupal::state()->get('file_test.allow_all', FALSE)) {
    $files = \Drupal::entityTypeManager()->getStorage('file')->loadByProperties(['uri' => $uri]);
    $file = reset($files);
    return file_get_content_headers($file);
  }
  _file_test_log_call('download', [$uri]);
  return _file_test_get_return('download');
}

/**
 * Implements hook_ENTITY_TYPE_insert() for file entities.
 */
function file_test_file_insert(File $file) {
  _file_test_log_call('insert', [$file->id()]);
}

/**
 * Implements hook_ENTITY_TYPE_update() for file entities.
 */
function file_test_file_update(File $file) {
  _file_test_log_call('update', [$file->id()]);
}

/**
 * Implements hook_file_copy().
 */
function file_test_file_copy(File $file, $source) {
  _file_test_log_call('copy', [$file->id(), $source->id()]);
}

/**
 * Implements hook_file_move().
 */
function file_test_file_move(File $file, File $source) {
  _file_test_log_call('move', [$file->id(), $source->id()]);
}

/**
 * Implements hook_ENTITY_TYPE_predelete() for file entities.
 */
function file_test_file_predelete(File $file) {
  _file_test_log_call('delete', [$file->id()]);
}

/**
 * Implements hook_file_url_alter().
 */
function file_test_file_url_alter(&$uri) {
  /** @var \Drupal\Core\StreamWrapper\StreamWrapperManagerInterface $stream_wrapper_manager */
  $stream_wrapper_manager = \Drupal::service('stream_wrapper_manager');

  // Only run this hook when this variable is set. Otherwise, we'd have to add
  // another hidden test module just for this hook.
  $alter_mode = \Drupal::state()->get('file_test.hook_file_url_alter');
  if (!$alter_mode) {
    return;
  }
  // Test alteration of file URLs to use a CDN.
  elseif ($alter_mode == 'cdn') {
    $cdn_extensions = ['css', 'js', 'gif', 'jpg', 'jpeg', 'png'];

    // Most CDNs don't support private file transfers without a lot of hassle,
    // so don't support this in the common case.
    $schemes = ['public'];

    $scheme = $stream_wrapper_manager::getScheme($uri);

    // Only serve shipped files and public created files from the CDN.
    if (!$scheme || in_array($scheme, $schemes)) {
      // Shipped files.
      if (!$scheme) {
        $path = $uri;
      }
      // Public created files.
      else {
        $wrapper = $stream_wrapper_manager->getViaScheme($scheme);
        $path = $wrapper->getDirectoryPath() . '/' . $stream_wrapper_manager::getTarget($uri);
      }

      // Clean up Windows paths.
      $path = str_replace('\\', '/', $path);

      // Serve files with one of the CDN extensions from CDN 1, all others from
      // CDN 2.
      $pathinfo = pathinfo($path);
      if (array_key_exists('extension', $pathinfo) && in_array($pathinfo['extension'], $cdn_extensions)) {
        $uri = FILE_URL_TEST_CDN_1 . '/' . $path;
      }
      else {
        $uri = FILE_URL_TEST_CDN_2 . '/' . $path;
      }
    }
  }
  // Test alteration of file URLs to use root-relative URLs.
  elseif ($alter_mode == 'root-relative') {
    // Only serve shipped files and public created files with root-relative
    // URLs.
    $scheme = $stream_wrapper_manager::getScheme($uri);
    if (!$scheme || $scheme == 'public') {
      // Shipped files.
      if (!$scheme) {
        $path = $uri;
      }
      // Public created files.
      else {
        $wrapper = $stream_wrapper_manager->getViaScheme($scheme);
        $path = $wrapper->getDirectoryPath() . '/' . $stream_wrapper_manager::getTarget($uri);
      }

      // Clean up Windows paths.
      $path = str_replace('\\', '/', $path);

      // Generate a root-relative URL.
      $uri = base_path() . '/' . $path;
    }
  }
  // Test alteration of file URLs to use protocol-relative URLs.
  elseif ($alter_mode == 'protocol-relative') {
    // Only serve shipped files and public created files with protocol-relative
    // URLs.
    $scheme = $stream_wrapper_manager::getScheme($uri);
    if (!$scheme || $scheme == 'public') {
      // Shipped files.
      if (!$scheme) {
        $path = $uri;
      }
      // Public created files.
      else {
        $wrapper = $stream_wrapper_manager->getViaScheme($scheme);
        $path = $wrapper->getDirectoryPath() . '/' . $stream_wrapper_manager::getTarget($uri);
      }

      // Clean up Windows paths.
      $path = str_replace('\\', '/', $path);

      // Generate a protocol-relative URL.
      $uri = '/' . base_path() . '/' . $path;
    }
  }
}

/**
 * Implements hook_file_mimetype_mapping_alter().
 */
function file_test_file_mimetype_mapping_alter(&$mapping) {
  // Add new mappings.
  $mapping['mimetypes']['file_test_mimetype_1'] = 'madeup/file_test_1';
  $mapping['mimetypes']['file_test_mimetype_2'] = 'madeup/file_test_2';
  $mapping['mimetypes']['file_test_mimetype_3'] = 'madeup/doc';
  $mapping['extensions']['file_test_1'] = 'file_test_mimetype_1';
  $mapping['extensions']['file_test_2'] = 'file_test_mimetype_2';
  $mapping['extensions']['file_test_3'] = 'file_test_mimetype_2';
  // Override existing mapping.
  $mapping['extensions']['doc'] = 'file_test_mimetype_3';
}

/**
 * Helper validator that returns the $errors parameter.
 */
function file_test_validator(File $file, $errors) {
  return $errors;
}

/**
 * Helper function for testing FileSystemInterface::scanDirectory().
 *
 * Each time the function is called the file is stored in a static variable.
 * When the function is called with no $filepath parameter, the results are
 * returned.
 *
 * @param string|null $filepath
 *   File path
 * @param bool $reset
 *   (optional) If to reset the internal memory cache. If TRUE is passed, the
 *   first parameter has no effect. Defaults to FALSE.
 *
 * @return array
 *   If $filepath is NULL, an array of all previous $filepath parameters
 */
function file_test_file_scan_callback($filepath = NULL, $reset = FALSE) {
  static $files = [];

  if ($reset) {
    $files = [];
  }
  elseif ($filepath) {
    $files[] = $filepath;
  }

  return $files;
}

/**
 * Reset static variables used by file_test_file_scan_callback().
 */
function file_test_file_scan_callback_reset() {
  file_test_file_scan_callback(NULL, TRUE);
}

/**
 * Implements hook_entity_info_alter().
 */
function file_test_entity_type_alter(&$entity_types) {
  if (\Drupal::state()->get('file_test_alternate_access_handler', FALSE)) {
    /** @var \Drupal\Core\Entity\EntityTypeInterface[] $entity_types */
    $entity_types['file']
      ->setAccessClass('Drupal\file_test\FileTestAccessControlHandler');
  }
}