<?php

declare(strict_types=1);

namespace WP\McpSchema\Common\Protocol\DTO;

use WP\McpSchema\Client\Lifecycle\Union\ClientResultInterface;
use WP\McpSchema\Common\Traits\ValidatesRequiredFields;
use WP\McpSchema\Server\Lifecycle\Union\ServerResultInterface;

/**
 * The response to a tasks/result request.
 * The structure matches the result type of the original request.
 * For example, a tools/call task would return the CallToolResult structure.
 *
 * Note: This class is structurally identical to Result.
 * It exists as a separate type for semantic distinction per MCP specification.
 *
 * @since 2025-11-25
 *
 * @mcp-domain Common
 * @mcp-subdomain Protocol
 * @mcp-version 2025-11-25
 * @see Result
 */
class GetTaskPayloadResult extends Result implements ClientResultInterface, ServerResultInterface
{
    use ValidatesRequiredFields;

    /**
     * Wire keys this class models. Anything else is kept in $additionalProperties.
     *
     * @var array<int, string>
     */
    private const KNOWN_KEYS = ['_meta'];

    /**
     * @param array<string, mixed>|null $_meta @since 2025-11-25
     * @param array<string, mixed>|null $additionalProperties
     */
    public function __construct(
        ?array $_meta = null,
        ?array $additionalProperties = null
    ) {
        parent::__construct($_meta, $additionalProperties);
    }

    /**
     * Creates an instance from an array.
     *
     * @param array{
     *     _meta?: array<string, mixed>|null
     * } $data
     * @phpstan-param array<string, mixed> $data
     * @return self
     */
    public static function fromArray(array $data): self
    {
        return new self(
            self::asArrayOrNull($data['_meta'] ?? null),
            self::additionalFields($data, self::KNOWN_KEYS)
        );
    }

    /**
     * Converts the instance to an array.
     *
     * @return array<string, mixed>
     */
    public function toArray(): array
    {
        $result = parent::toArray();

        return $result;
    }
}
