<?php

namespace Drupal\canvas_ai\Plugin\AiFunctionCall;

use Drupal\Component\Serialization\Json;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\Core\Plugin\Context\ContextDefinition;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\ai\Attribute\FunctionCall;
use Drupal\ai\Base\FunctionCallBase;
use Drupal\ai\Service\FunctionCalling\ExecutableFunctionCallInterface;
use Drupal\ai\Service\FunctionCalling\FunctionCallInterface;
use Drupal\ai_agents\PluginInterfaces\AiAgentContextInterface;
use Drupal\canvas\Entity\JavaScriptComponent;
use Drupal\canvas\Exception\ConstraintViolationException;
use Drupal\canvas\Validation\ConstraintPropertyPathTranslatorTrait;
use Psr\Log\LoggerInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\Yaml\Yaml;

/**
 * Plugin implementation of the create component function.
 */
#[FunctionCall(
  id: 'ai_agent:create_component',
  function_name: 'ai_agent_create_component',
  name: 'Create new component',
  description: 'This method creates a new component.',
  group: 'modification_tools',
  module_dependencies: ['canvas'],
  context_definitions: [
    'component_name' => new ContextDefinition(
      data_type: 'string',
      label: new TranslatableMarkup("Component Name"),
      description: new TranslatableMarkup("The data name of the component that we should create."),
      required: TRUE
    ),
    'js_structure' => new ContextDefinition(
      data_type: 'string',
      label: new TranslatableMarkup("Javascript"),
      description: new TranslatableMarkup("All the new javascript."),
      required: FALSE
    ),
    'css_structure' => new ContextDefinition(
      data_type: 'string',
      label: new TranslatableMarkup("CSS"),
      description: new TranslatableMarkup("All the new CSS."),
      required: FALSE
    ),
    'props_metadata' => new ContextDefinition(
      data_type: 'string',
      label: new TranslatableMarkup("Props"),
      description: new TranslatableMarkup("Metadata for props"),
      required: FALSE
    ),
  ],
)]
final class CreateComponent extends FunctionCallBase implements ExecutableFunctionCallInterface, AiAgentContextInterface, BuilderResponseFunctionCallInterface {

  use ConstraintPropertyPathTranslatorTrait;

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

  protected LoggerInterface $logger;

  /**
   * Load from dependency injection container.
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition): FunctionCallInterface | static {
    $instance = new static(
      $configuration,
      $plugin_id,
      $plugin_definition,
      $container->get('ai.context_definition_normalizer'),
    );
    $instance->entityTypeManager = $container->get(EntityTypeManagerInterface::class);
    $instance->logger = $container->get('logger.factory')->get('canvas_ai');
    return $instance;
  }

  /**
   * {@inheritdoc}
   */
  public function execute(): void {
    try {
      // Collect the context values.
      $component_name = $this->getContextValue('component_name');
      $javascript = $this->getContextValue('js_structure') ?? '';
      $css = $this->getContextValue('css_structure') ?? '';
      $props = $this->getContextValue('props_metadata') ?? '';
      $machine_name = strtolower(preg_replace('/\s+/', '_', $component_name));

      // Check if the component exists.
      /** @var \Drupal\canvas\Entity\JavaScriptComponent $component */
      $component = $this->entityTypeManager->getStorage('js_component')->load($machine_name);

      // If the component does not exist, return an error.
      if ($component) {
        throw new \Exception("The component with same name already exists.");
      }

      if (str_contains($css, '@apply')) {
        $this->setOutput(Yaml::dump(['error' => '@apply directives are not supported.'], 10, 2));
        return;
      }
      $props_array = Json::decode($props);
      $transformed_props = [];
      $required_props = [];
      if (\is_array($props_array)) {
        foreach ($props_array as $prop) {
          if (!empty($prop['id']) && !empty($prop['name']) && !empty($prop['type']) && !empty($prop['example'])) {
            $transformed = [
              'title' => $prop['name'],
              'type' => $prop['type'],
              'examples' => [$prop['example']],
            ];
            foreach (['format', '$ref', 'enum'] as $optional) {
              if (isset($prop[$optional])) {
                $transformed[$optional] = $prop[$optional];
              }
            }
            $transformed_props[$prop['id']] = $transformed;

            if (!empty($prop['required']) && $prop['required'] === TRUE) {
              $required_props[] = $prop['id'];
            }
          }
        }
      }
      $output = [
        'name' => $component_name,
        'machineName' => $machine_name,
        // Mark this code component as "internal": do not make it available to Content Creators yet.
        // @see docs/config-management.md, section 3.2.1
        'status' => FALSE,
        'sourceCodeJs' => $javascript,
        'sourceCodeCss' => $css,
        'compiledJs' => '',
        'compiledCss' => '',
        'importedJsComponents' => [],
        'props' => $transformed_props,
        'required' => $required_props,
        'dataDependencies' => [],
      ];
      $violations = JavaScriptComponent::createFromClientSide($output)->getTypedData()->validate();
      if ($violations->count() > 0) {

        // Translate constraint property paths to match YAML input structure
        $translatedViolations = $this->translateConstraintPropertyPathsAndRoot(
          ['' => 'component_structure.'],
          $violations,
          ''
        );
        throw new ConstraintViolationException($translatedViolations, 'Component validation errors');
      }
    }
    catch (\Exception $e) {
      $this->logger->error($e->getMessage());
      // \Drupal\canvas_ai\Controller\CanvasBuilder::render() also YAML parsable output.
      // @see \Drupal\canvas_ai\Controller\CanvasBuilder::render()
      $this->setOutput(Yaml::dump(['error' => \sprintf('Failed to process Javascript component data: %s', $e->getMessage())], 10, 2));
      return;
    }
    $this->setStructuredOutput(['component_structure' => $output]);
    $this->setOutput('The component ' . $component_name . ' has been created successfully.');
  }

}
