<?php

namespace Ulmus\Api\Weather;

use Psr\Container\ContainerInterface;
use Psr\Http\Message\{ RequestInterface, ResponseInterface };
use Ulmus\Api\ApiHandlerInterface;
use Ulmus\Api\Attribute\Obj\Api\{ Read, Collection };
use Ulmus\Api\Common\Uri;
use Ulmus\Api\Response\JsonResponse;
use Ulmus\Api\Stream\JsonStream;
use Ulmus\Api\Stream\Stream;
use Ulmus\Repository\RepositoryInterface;

class ApiHandler implements ApiHandlerInterface
{
    public function __construct(
        protected ? string $unitScale,
    ) {}

    public function executingRequest(RepositoryInterface $repository, \Ulmus\Api\Attribute\Obj\Api\ApiAction $attribute) : void
    {
        $repository->bindUrl('apiBase', $repository->entityClass::API_BASE_URL);
    }

    public function handleRequest(RequestInterface $request, \Ulmus\Api\Attribute\Obj\Api\ApiAction $attribute) : RequestInterface
    {
        if ($this->unitScale) {
            $uriParams['unitScale'] = $this->unitScale;
        }

        if ($attribute->fields) {
            $uriParams['fields'] = implode(',', $attribute->fields);
        }

        if ($uriParams ?? false) {
            $request = $request->withUri(
                ( new Uri($request->getUri()) )->withQuery($uriParams)
            );
        }

        return $request;
    }

    public function handleResponse(ResponseInterface $response, \Ulmus\Api\Attribute\Obj\Api\ApiAction $attribute) : ResponseInterface
    {
        try {
            $json = $response->getParsedBody();

            if (! empty($json['forecast']) ) {
                foreach($json['forecast'] as &$forecast) {
                    $forecast['date'] = $this->adjustTimezone($forecast['date']);
                }

                if ($attribute instanceof Collection) {
                    $response = $response->withParsedBody($json['forecast']);
                }
            }

            if (! empty($json['nowcast'])) {
                $json['nowcast']['timestamp'] = new \DateTime($json['nowcast']['timestamp'], new \DateTimeZone('UTC'))->setTimezone(new \DateTimeZone('America/Toronto'))->format('Y-m-d H:i:s');

                if ($attribute instanceof Read) {
                    $response = $response->withParsedBody($json['nowcast']);
                }
            }
        }
        catch(\Throwable $e) {
            $msg = $json['errorMessage'] ?? $e->getMessage();
            $code = $json['errorCode'] ?? $e->getCode();

            throw new \Exception(sprintf("WeatherSource error: '%s'", $msg), $code);
        }

        return JsonResponse::fromResponse($response);
    }

    protected function adjustTimezone(string $datetime) : string
    {
        return new \DateTime("@" . strtotime($datetime))->format('Y-m-d H:i:s');
    }
}