<?php

namespace NetteUtils\Rest;

use Throwable;

use Nette\Application\UI\Presenter;
use Nette\Http\IResponse;
use Nette\Http\IRequest;
use Nette\Application\Responses\TextResponse;
use Nette\Application\Responses\JsonResponse;
use JMS\Serializer\Serializer;

/**
 * Ancestor for all presenters that are intended to offer REST API. Provides utility methods
 * to simplify response sending as well as some basic dependencies. Also provides authentication.
 *
 * @author Jan Pavlíček <jan@pavlicek.dev>
 * @since 1.0.0
 */
abstract class HttpServicePresenter extends Presenter
{
    protected IResponse $response;


    protected IRequest $request;


    protected Serializer $serializer;


    public function injectResponse(IResponse $response) : void
    {
        $this->response = $response;
    }


    public function injectRequest(IRequest $request) : void
    {
        $this->request = $request;
    }


    public function injectSerializer(Serializer $serializer) : void
    {
        $this->serializer = $serializer;
    }


    /**
     * Set some basic CORS headers and proper configuration of OPTIONS methods. Then authenticate each request.
     */
    protected function startup()
    {
        parent::startup();
        $this->response->setContentType('application/json', 'utf-8');
        $this->response->setHeader('Access-Control-Allow-Origin', '*');
        $this->response->setHeader('Access-Control-Expose-Headers', 'id');
        if($this->request->method == 'OPTIONS') {
            $this->response->setHeader('Access-Control-Allow-Methods', 'POST, PUT, GET, DELETE');
            $this->response->setHeader(
                'Access-Control-Allow-Headers', 'origin, content-type, accept, X-API-Key');
            $this->response->setCode(IResponse::S200_OK);
            $this->terminate();
        }
    }


    /**
     * Returns OpenAPI specification in yml format
     */
    public function actionOpenapi()
    {
        $spec = @$this->getContext()->getParameters()['docDir'] . "/openapi.yml";
        $this->sendResponse(new \Nette\Application\Responses\FileResponse($spec, 'openapi.yml', 'application/x-yaml'));
    }


    protected function sendValidationErrorResponse($message = null, $code = IResponse::S400_BAD_REQUEST)
    {
        $this->response->setCode($code);
        $this->sendResponse(new TextResponse($this->ensureJsonAsString($message)));
        $this->terminate();
    }


    protected function sendExceptionErrorResponse(Throwable $exception, $code = IResponse::S500_INTERNAL_SERVER_ERROR)
    {
        $this->response->setCode(IResponse::S500_INTERNAL_SERVER_ERROR);
        $this->sendResponse(new JsonResponse(['fault' => [
            'faultcode' => $code,
            'faultstring' => $exception->getMessage(),
            'detail' => get_class($exception) . ": " . $exception->getMessage()
        ]]));
        $this->terminate();
    }


    protected function sendJsonResponse($json, $code = IResponse::S200_OK)
    {
        $this->response->setCode($code);
        $this->sendResponse(new TextResponse($this->ensureJsonAsString($json)));
        $this->terminate();
    }


    protected function sendCreatedResponse($json = null, $code = IResponse::S201_CREATED)
    {
        $this->sendResponseWithCodeAndOptionalJson($code, $json);
    }


    protected function sendAcceptedResponse($json = null, $code = IResponse::S202_ACCEPTED)
    {
        $this->sendResponseWithCodeAndOptionalJson($code, $json);
    }


    protected function sendNotFoundResponse($json = null, $code = IResponse::S404_NOT_FOUND)
    {
        $this->sendResponseWithCodeAndOptionalJson($code, $json);
    }


    protected function sendResponseWithCodeAndOptionalJson(int $code, $json = null)
    {
        $this->response->setCode($code);
        if ($json) {
            $this->sendResponse(new TextResponse($this->ensureJsonAsString($json)));
        }
        $this->terminate();
    }


    protected function parseJsonPayload(bool $exception_on_failure = false, bool $as_array = true) : array
    {
        $payload = json_decode(file_get_contents('php://input'), $as_array);

        if (!$payload) {
            if ($exception_on_failure) {
                throw new \RuntimeException("No valid json to deserialize in request body");
            } else {
                $this->sendValidationErrorResponse("Malformed JSON body");
            }
        }

        return $payload;
    }


    protected function ensureJsonAsString($json) : string
    {
        if (is_array($json)) {
            $json = json_encode($json);
        } elseif (is_object($json)) {
            $json = $this->serializer->serialize($json, 'json');
        }
        return $json;
    }
}