<?php

declare(strict_types=1);

namespace Drupal\Core\Recipe;

use Drupal\Core\DefaultContent\Finder;
use Drupal\Core\Extension\Dependency;
use Drupal\Core\Extension\ExtensionDiscovery;
use Drupal\Core\Extension\ModuleExtensionList;
use Drupal\Core\Extension\ThemeExtensionList;
use Drupal\Component\Serialization\Yaml;
use Drupal\Core\Render\Element;
use Drupal\Core\TypedData\PrimitiveInterface;
use Drupal\Core\Validation\Plugin\Validation\Constraint\RegexConstraint;
use Symfony\Component\Validator\Constraints\All;
use Symfony\Component\Validator\Constraints\AtLeastOneOf;
use Symfony\Component\Validator\Constraints\Callback;
use Symfony\Component\Validator\Constraints\Choice;
use Symfony\Component\Validator\Constraints\Collection;
use Symfony\Component\Validator\Constraints\Count;
use Symfony\Component\Validator\Constraints\IdenticalTo;
use Symfony\Component\Validator\Constraints\NotBlank;
use Symfony\Component\Validator\Constraints\NotIdenticalTo;
use Symfony\Component\Validator\Constraints\Optional;
use Symfony\Component\Validator\Constraints\Regex;
use Symfony\Component\Validator\Constraints\Required;
use Symfony\Component\Validator\Constraints\Sequentially;
use Symfony\Component\Validator\Constraints\Type;
use Symfony\Component\Validator\Context\ExecutionContextInterface;
use Symfony\Component\Validator\Validation;

/**
 * @internal
 *   This API is experimental.
 */
final class Recipe {

  const COMPOSER_PROJECT_TYPE = 'drupal-recipe';

  /**
   * @param string $name
   *   The human-readable name of the recipe.
   * @param string $description
   *   A short description of the recipe.
   * @param string $type
   *   The recipe type.
   * @param \Drupal\Core\Recipe\RecipeConfigurator $recipes
   *   The recipe configurator, which lists the recipes that will be applied
   *   before this one.
   * @param \Drupal\Core\Recipe\InstallConfigurator $install
   *   The install configurator, which lists the extensions this recipe will
   *   install.
   * @param \Drupal\Core\Recipe\ConfigConfigurator $config
   *   The config configurator, which lists the config that this recipe will
   *   install, and what config actions will be taken.
   * @param \Drupal\Core\Recipe\InputConfigurator $input
   *   The input configurator, which collects any input values used by the
   *   recipe.
   * @param \Drupal\Core\DefaultContent\Finder $content
   *   The default content finder.
   * @param string $path
   *   The recipe's path.
   * @param array $extra
   *   Any extra information to expose to specific modules.
   */
  public function __construct(
    public readonly string $name,
    public readonly string $description,
    public readonly string $type,
    public readonly RecipeConfigurator $recipes,
    public readonly InstallConfigurator $install,
    public readonly ConfigConfigurator $config,
    public readonly InputConfigurator $input,
    public readonly Finder $content,
    public readonly string $path,
    private readonly array $extra,
  ) {}

  /**
   * Creates a recipe object from the provided path.
   *
   * @param string $path
   *   The path to a recipe.
   *
   * @return static
   *   The Recipe object.
   */
  public static function createFromDirectory(string $path): static {
    $recipe_data = self::parse($path . '/recipe.yml');

    $recipes = new RecipeConfigurator(is_array($recipe_data['recipes']) ? $recipe_data['recipes'] : [], dirname($path));
    $install = new InstallConfigurator($recipe_data['install'], \Drupal::service('extension.list.module'), \Drupal::service('extension.list.theme'));
    $config = new ConfigConfigurator($recipe_data['config'], $path, \Drupal::service('config.storage'));
    $input = new InputConfigurator($recipe_data['input'] ?? [], $recipes, basename($path), \Drupal::typedDataManager());
    $content = new Finder($path . '/content');
    return new static($recipe_data['name'], $recipe_data['description'], $recipe_data['type'], $recipes, $install, $config, $input, $content, $path, $recipe_data['extra'] ?? []);
  }

  /**
   * Parses and validates a recipe.yml file.
   *
   * @param string $file
   *   The path of a recipe.yml file.
   *
   * @return mixed[]
   *   The parsed and validated data from the file.
   *
   * @throws \Drupal\Core\Recipe\RecipeFileException
   *   Thrown if the recipe.yml file is unreadable, invalid, or cannot be
   *   validated.
   */
  private static function parse(string $file): array {
    if (!file_exists($file)) {
      throw new RecipeFileException($file, "There is no $file file");
    }
    $recipe_contents = file_get_contents($file);
    if (!$recipe_contents) {
      throw new RecipeFileException($file, "$file does not exist or could not be read.");
    }
    // Certain parts of our validation need to be able to scan for other
    // recipes.
    // @see ::validateRecipeExists()
    // @see ::validateConfigActions()
    $include_path = dirname($file, 2);

    $constraints = new Collection([
      'name' => new Required([
        new Type('string'),
        new NotBlank(),
        // Matching `type: label` in core.data_types.schema.yml.
        new RegexConstraint(
          pattern: '/([^\PC])/u',
          message: 'Recipe names cannot span multiple lines or contain control characters.',
          match: FALSE,
        ),
      ]),
      'description' => new Optional([
        new NotBlank(),
        // Matching `type: text` in core.data_types.schema.yml.
        new RegexConstraint(
          pattern: '/([^\PC\x09\x0a\x0d])/u',
          message: 'The recipe description cannot contain control characters, only visible characters.',
          match: FALSE,
        ),
      ]),
      'type' => new Optional([
        new Type('string'),
        new NotBlank(),
        // Matching `type: label` in core.data_types.schema.yml.
        new RegexConstraint(
          pattern: '/([^\PC])/u',
          message: 'Recipe type cannot span multiple lines or contain control characters.',
          match: FALSE,
        ),
      ]),
      'recipes' => new Optional([
        new All([
          new Type('string'),
          new NotBlank(),
          // If recipe depends on itself, ::validateRecipeExists() will set off
          // an infinite loop. We can avoid that by skipping that validation if
          // the recipe depends on itself, which is what Sequentially does.
          new Sequentially([
            new NotIdenticalTo(
              value: basename(dirname($file)),
              message: 'The {{ compared_value }} recipe cannot depend on itself.',
            ),
            new Callback(
              callback: self::validateRecipeExists(...),
              payload: $include_path,
            ),
          ]),
        ]),
      ]),
      // @todo https://www.drupal.org/i/3424603 Validate the corresponding
      //   import.
      'install' => new Optional([
        new All([
          new Type('string'),
          new Sequentially([
            new NotBlank(),
            new Callback(self::validateExtensionIsAvailable(...)),
          ]),
        ]),
      ]),
      'input' => new Optional([
        new Type('associative_array'),
        new All([
          new Collection(
            fields: [
              // Every input definition must have a description.
              'description' => [
                new Type('string'),
                new NotBlank(),
              ],
              // There can be an optional set of constraints, which is an
              // associative array of arrays, as in config schema.
              'constraints' => new Optional([
                new Type('associative_array'),
              ]),
              'data_type' => [
                // The data type must be known to the typed data system.
                \Drupal::service('validation.constraint')->createInstance('PluginExists', [
                  'manager' => 'typed_data_manager',
                  // Only primitives are supported because it's not always clear
                  // how to collect, validate, and cast complex structures.
                  'interface' => PrimitiveInterface::class,
                ]),
              ],
              // The `prompt` and `form` elements, though optional, have their
              // own sets of constraints,
              'prompt' => new Optional([
                new Collection([
                  'method' => [
                    new Choice(['ask', 'askHidden', 'confirm', 'choice']),
                  ],
                  'arguments' => new Optional([
                    new Type('associative_array'),
                  ]),
                ]),
              ]),
              'form' => new Optional([
                new Sequentially([
                  new Type('associative_array'),
                  // Every element in the `form` array has to be a form API
                  // property, prefixed with `#`. Because recipe inputs can only
                  // be primitive data types, child elements aren't allowed.
                  new Callback(function (array $element, ExecutionContextInterface $context): void {
                    if (Element::children($element)) {
                      $context->addViolation('Form elements for recipe inputs cannot have child elements.');
                    }
                  }),
                ]),
              ]),
              // Every input must define a default value.
              'default' => new Required([
                new Collection([
                  'source' => new Required([
                    new Choice(['value', 'config']),
                  ]),
                  'value' => new Optional(),
                  'config' => new Optional([
                    new Sequentially([
                      new Type('list'),
                      new Count(2),
                      new All([
                        new Type('string'),
                        new NotBlank(),
                      ]),
                    ]),
                  ]),
                ]),
                new Callback(self::validateDefaultValueDefinition(...)),
              ]),
            ]),
        ]),
      ]),
      'config' => new Optional([
        new Collection([
          // Each entry in the `import` list can either be `*` (import all of
          // the extension's config), or a list of config names to import from
          // the extension.
          // @todo https://www.drupal.org/i/3439716 Validate config file name,
          //   if given.
          'import' => new Optional([
            new All([
              new AtLeastOneOf([
                new IdenticalTo('*'),
                new All([
                  new Type('string'),
                  new NotBlank(),
                  new Regex('/^.+\./'),
                ]),
              ]),
            ]),
          ]),
          'strict' => new Optional([
            new AtLeastOneOf([
              new Type('boolean'),
              new All([
                new Type('string'),
                new NotBlank(),
                new Regex('/^.+\./'),
              ]),
            ], message: 'This value must be a boolean, or a list of config names.', includeInternalMessages: FALSE),
          ]),
          'actions' => new Optional([
            new All([
              new Type('array'),
              new NotBlank(),
              new Callback(
                callback: self::validateConfigActions(...),
                payload: $include_path,
              ),
            ]),
          ]),
        ]),
      ]),
      'content' => new Optional([
        new Type('array'),
      ]),
      'extra' => new Optional([
        new Sequentially([
          new Type('associative_array'),
          new Callback(self::validateKeysAreValidExtensionNames(...)),
        ]),
      ]),
    ]);

    $recipe_data = Yaml::decode($recipe_contents);
    /** @var \Symfony\Component\Validator\ConstraintViolationList $violations */
    $violations = Validation::createValidator()->validate($recipe_data, $constraints);
    if (count($violations) > 0) {
      throw RecipeFileException::fromViolationList($file, $violations);
    }
    $recipe_data += [
      'description' => '',
      'type' => '',
      'recipes' => [],
      'install' => [],
      'config' => [],
      'content' => [],
    ];
    return $recipe_data;
  }

  /**
   * Validates the definition of an input's default value.
   *
   * @param array $definition
   *   The array to validate (part of a single input definition).
   * @param \Symfony\Component\Validator\Context\ExecutionContextInterface $context
   *   The validator execution context.
   *
   * @see ::parse()
   */
  public static function validateDefaultValueDefinition(array $definition, ExecutionContextInterface $context): void {
    $source = $definition['source'];

    if (!array_key_exists($source, $definition)) {
      $context->addViolation("The '$source' key is required.");
    }
  }

  /**
   * Validates that the value is an available module/theme (installed or not).
   *
   * @param string $value
   *   The value to validate.
   * @param \Symfony\Component\Validator\Context\ExecutionContextInterface $context
   *   The validator execution context.
   *
   * @see \Drupal\Core\Extension\ExtensionList::getAllAvailableInfo()
   */
  private static function validateExtensionIsAvailable(string $value, ExecutionContextInterface $context): void {
    $name = Dependency::createFromString($value)->getName();
    $all_available = \Drupal::service(ModuleExtensionList::class)->getAllAvailableInfo() + \Drupal::service(ThemeExtensionList::class)->getAllAvailableInfo();
    if (!array_key_exists($name, $all_available)) {
      $context->addViolation('"%extension" is not a known module or theme.', [
        '%extension' => $name,
      ]);
    }
  }

  /**
   * Validates that a recipe exists.
   *
   * @param string $name
   *   The machine name of the recipe to look for.
   * @param \Symfony\Component\Validator\Context\ExecutionContextInterface $context
   *   The validator execution context.
   * @param string $include_path
   *   The recipe's include path.
   */
  private static function validateRecipeExists(string $name, ExecutionContextInterface $context, string $include_path): void {
    if (empty($name)) {
      return;
    }
    try {
      RecipeConfigurator::getIncludedRecipe($include_path, $name);
    }
    catch (UnknownRecipeException) {
      $context->addViolation('The %name recipe does not exist.', ['%name' => $name]);
    }
  }

  /**
   * Validates that the corresponding extension is enabled for a config action.
   *
   * @param mixed $value
   *   The config action; not used.
   * @param \Symfony\Component\Validator\Context\ExecutionContextInterface $context
   *   The validator execution context.
   * @param string $include_path
   *   The recipe's include path.
   */
  private static function validateConfigActions(mixed $value, ExecutionContextInterface $context, string $include_path): void {
    $config_name = str_replace(['[config][actions]', '[', ']'], '', $context->getPropertyPath());
    [$config_provider] = explode('.', $config_name);
    if ($config_provider === 'core') {
      return;
    }

    $recipe_being_validated = $context->getRoot();
    assert(is_array($recipe_being_validated));

    $configurator = new RecipeConfigurator($recipe_being_validated['recipes'] ?? [], $include_path);

    /** @var \Drupal\Core\Extension\ModuleExtensionList $module_list */
    $module_list = \Drupal::service('extension.list.module');
    // The config provider must either be an already-installed module or theme,
    // or an extension being installed by this recipe or a recipe it depends on.
    $all_extensions = [
      ...array_keys($module_list->getAllInstalledInfo()),
      ...array_keys(\Drupal::service('extension.list.theme')->getAllInstalledInfo()),
      ...$recipe_being_validated['install'] ?? [],
      ...$configurator->listAllExtensions(),
    ];
    // Explicitly treat required modules as installed, even if Drupal isn't
    // installed yet, because we know they WILL be installed.
    foreach ($module_list->getAllAvailableInfo() as $name => $info) {
      if (!empty($info['required'])) {
        $all_extensions[] = $name;
      }
    }

    if (!in_array($config_provider, $all_extensions, TRUE)) {
      $context->addViolation('Config actions cannot be applied to %config_name because the %config_provider extension is not installed, and is not installed by this recipe or any of the recipes it depends on.', [
        '%config_name' => $config_name,
        '%config_provider' => $config_provider,
      ]);
    }
  }

  /**
   * Validates that the keys of an array are valid extension names.
   *
   * Note that the keys do not have to be the names of extensions that are
   * installed, or even extensions that exist. They just have to follow the
   * form of a valid extension name.
   *
   * @param array $value
   *   The array being validated.
   * @param \Symfony\Component\Validator\Context\ExecutionContextInterface $context
   *   The validator execution context.
   */
  private static function validateKeysAreValidExtensionNames(array $value, ExecutionContextInterface $context): void {
    $keys = array_keys($value);
    foreach ($keys as $key) {
      if (!preg_match(ExtensionDiscovery::PHP_FUNCTION_PATTERN, $key)) {
        $context->addViolation('%name is not a valid extension name.', [
          '%name' => $key,
        ]);
      }
    }
  }

  /**
   * Returns extra information to expose to a particular extension.
   *
   * @param string $extension_name
   *   The name of a Drupal extension.
   *
   * @return mixed
   *   The extra data exposed to the given extension, or NULL if there is none.
   */
  public function getExtra(string $extension_name): mixed {
    return $this->extra[$extension_name] ?? NULL;
  }

}