<?php

declare(strict_types=1);

namespace WordPress\AiClient\Providers\Http\Exception;

use WordPress\AiClient\Common\Exception\InvalidArgumentException;
use WordPress\AiClient\Providers\Http\DTO\Request;
use WordPress\AiClient\Providers\Http\DTO\Response;
use WordPress\AiClient\Providers\Http\Util\ErrorMessageExtractor;

/**
 * Exception thrown for 4xx HTTP client errors.
 *
 * This represents errors where the client request was malformed,
 * unauthorized, forbidden, or otherwise invalid.
 *
 * @since 0.2.0
 */
class ClientException extends InvalidArgumentException
{
    /**
     * The request that failed.
     *
     * @var Request|null
     */
    protected ?Request $request = null;

    /**
     * Returns the request that failed as our Request DTO.
     *
     * @since 0.2.0
     *
     * @return Request
     * @throws \RuntimeException If no request is available
     */
    public function getRequest(): Request
    {
        if ($this->request === null) {
            throw new \RuntimeException(
                'Request object not available. This exception was directly instantiated. ' .
                'Use a factory method that provides request context.'
            );
        }

        return $this->request;
    }

    /**
     * Creates a ClientException from a client error response (4xx).
     *
     * This method extracts error details from common API response formats
     * and creates an exception with a descriptive message and status code.
     *
     * @since 0.2.0
     *
     * @param Response $response The HTTP response that failed.
     * @return self
     */
    public static function fromClientErrorResponse(Response $response): self
    {
        $statusCode = $response->getStatusCode();
        $statusTexts = [
            400 => 'Bad Request',
            401 => 'Unauthorized',
            403 => 'Forbidden',
            404 => 'Not Found',
            422 => 'Unprocessable Entity',
            429 => 'Too Many Requests',
        ];

        if (isset($statusTexts[$statusCode])) {
            $errorMessage = sprintf('%s (%d)', $statusTexts[$statusCode], $statusCode);
        } else {
            $errorMessage = sprintf(
                'Client error (%d): Request was rejected due to client-side issue',
                $statusCode
            );
        }

        // Extract error message from response data using centralized utility
        $extractedError = ErrorMessageExtractor::extractFromResponseData($response->getData());
        if ($extractedError !== null) {
            $errorMessage .= ' - ' . $extractedError;
        }

        return new self($errorMessage, $statusCode);
    }
}
