<?php

declare(strict_types=1);

namespace Apoloz\AlfaBank\Traits;

use Apoloz\AlfaBank\Exceptions\AlfaBankException;
use Saloon\Http\Response;
use Throwable;

trait HasAlfaErrorHandling
{
    /**
     * Determine if the request has failed.
     */
    public function hasRequestFailed(Response $response): ?bool
    {
        if ($response->status() >= 400) {
            return true;
        }

        $contentType = $response->header('Content-Type') ?? '';
        if (str_contains($contentType, 'application/json')) {
            $data = $response->json();
            if (isset($data['error']) || (isset($data['ErrorCode']) && (string) $data['ErrorCode'] !== '0')) {
                return true;
            }
        }

        return false;
    }

    /**
     * Get the custom exception for the failed request.
     */
    public function getRequestException(Response $response, ?Throwable $senderException): ?Throwable
    {
        $requestId = $response->header('X-Request-ID') ?? 'Unknown';
        $errorCode = 'UNKNOWN';
        $errorDescription = 'No description';

        $contentType = $response->header('Content-Type') ?? '';
        if (str_contains($contentType, 'application/json')) {
            $data = $response->json();
            $errorCode = $data['error'] ?? $data['ErrorCode'] ?? 'HTTP_' . $response->status();
            $rawDescription = $data['error_description'] ?? $data['message'] ?? 'Request failed';
            $errorDescription = $this->decodeBankMessage($rawDescription);
        } else {
            $errorCode = 'HTTP_' . $response->status();
            $errorDescription = 'Request failed with status ' . $response->status();
        }

        return new AlfaBankException(
            $response,
            (string) $errorCode,
            "({$requestId}) {$errorDescription}"
        );
    }

    private function decodeBankMessage(string $message): string
    {
        $decoded = preg_replace_callback(
            '/%u([0-9A-Fa-f]{4})/',
            fn ($m) => mb_convert_encoding(pack('H*', $m[1]), 'UTF-8', 'UCS-2BE'),
            $message
        );

        return urldecode($decoded);
    }
}