<?php

declare(strict_types=1);

namespace Uwil\ArcadiaApiPhpClient\Lib\Psr7;

use GuzzleHttp\Psr7\Request as Psr7Request;
use GuzzleHttp\Psr7\Uri;
use GuzzleHttp\Psr7\Utils as Psr7Utils;
use GuzzleHttp\Utils as GuzzleHttpUtils;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\UriInterface;
use Uwil\ArcadiaApiPhpClient\Lib\ApiConfig;
use Uwil\ArcadiaApiPhpClient\Lib\HttpMethod;
use Uwil\ArcadiaApiPhpClient\Utils\Utils;

final readonly class RequestFactory
{
    public function __construct(
        #[\SensitiveParameter]
        private readonly ApiConfig $apiConfig
    ) {
    }

    /**
     * @param  array<array-key,mixed>  $data
     * @param  array<string,string>  $headersMap
     */
    public function buildRequest(
        HttpMethod $method,
        UriInterface $uri,
        array $data = [],
        array $headersMap = [],
    ): RequestInterface {

        $scheme = $uri->getScheme();
        if ($scheme !== 'http' && $scheme !== 'https') {
            throw new \InvalidArgumentException('Only http(s) is allowed');
        }

        foreach ($headersMap as $headerName => $value) {
            if (! is_string($headerName)) {
                throw new \InvalidArgumentException('Header must be a string');
            }
            if (! is_string($value)) {
                throw new \InvalidArgumentException("Header value '{$headerName}' must be a string");
            }
        }

        // ! Make sure parameters are on queries when HTTP GET
        if ($method === HttpMethod::GET) {
            $this->putAllParamsOnQuery($uri, $data);
        } else {
            $this->putAllParamInData($uri, $data);
        }

        $timestamp = Utils::getNow();

        $request = new Psr7Request(
            \strtoupper($method->value),
            $uri,
            $headersMap
        );

        // NOTE: Dont prodive body content on GET method.
        $jsonEncodedData = $method !== HttpMethod::GET ? GuzzleHttpUtils::jsonEncode($data) : '';
        $alteredUri      = $this->transformUriInOrderToMatchLabProxy($uri);

        $signature      = Utils::calculateSignature(
            $method,
            $alteredUri,
            $jsonEncodedData,
            $this->apiConfig->secret,
            $timestamp
        );
        $fullApiHeaders = $this->addApiHeaders(
            $headersMap,
            $signature,
            $timestamp
        );

        return Psr7Utils::modifyRequest($request, [
            'set_headers' => $fullApiHeaders,
            'body'        => $jsonEncodedData,
        ]);
    }

    /**
     * @param  array<string,string>  $headers
     * @return array<string,string>
     */
    protected function addApiHeaders(
        array $headers,
        string $signature,
        \DateTimeInterface $timestamp
    ): array {
        return array_merge(
            $headers,
            [
                'Content-Type'    => 'application/json',
                'X-API-Key'       => $this->apiConfig->apiKey,
                'X-API-Signature' => $signature,
                'X-Timestamp'     => Utils::toRfc3339($timestamp),
            ]
        );
    }

    /**
     * @param  array<string,mixed>  $data
     */
    protected function putAllParamsOnQuery(UriInterface &$uri, array &$data): void
    {
        $existingQuery = $uri->getQuery();
        $queryArray    = [];
        if ($existingQuery !== '') {
            parse_str($existingQuery, $queryArray);
        }

        $merged = array_merge($queryArray, $data);

        $newQuery = $merged ? http_build_query($merged) : '';
        $uri      = $uri->withQuery($newQuery);

        $data = [];
    }

    /**
     * @param  array<array-key,mixed>  $data
     */
    protected function putAllParamInData(UriInterface &$uri, array &$data): void
    {
        $existingQuery = $uri->getQuery();
        if ($existingQuery === '') {
            return;
        }

        $queryArray = [];
        parse_str($existingQuery, $queryArray);

        $data = array_merge($queryArray, $data);

        $uri = $uri->withQuery('');
    }

    /**
     * FIXME: This should be removed, temp fix
     */
    protected function transformUriInOrderToMatchLabProxy(UriInterface $uri): UriInterface
    {
        $scheme    = $uri->getScheme();
        $authority = str_replace('lesidc', 'svlidc', $uri->getAuthority());
        $path      = '/gaston/api' . preg_replace('/^\/gaston\/api/', '', $uri->getPath());
        $query     = ! empty($uri->getQuery()) ? "?{$uri->getQuery()}" : '';
        $fragment  = ! empty($uri->getFragment()) ? "#{$uri->getFragment()}" : '';

        return new Uri(
            "{$scheme}://{$authority}{$path}{$query}{$fragment}"
        );
    }
}