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<?php

declare (strict_types=1);
namespace WordPress\AiClient\Common\Exception;

/**
 * Exception thrown when a token limit is reached during prompt fulfillment.
 *
 * Providers should throw this exception when the token usage for a request
 * exceeds the allowed limit, whether that is the model's context window
 * or a configured maximum.
 *
 * @since 1.0.0
 */
class TokenLimitReachedException extends \WordPress\AiClient\Common\Exception\RuntimeException
{
    /**
     * The token limit that was reached, if known.
     *
     * @since 1.0.0
     *
     * @var int|null
     */
    private $maxTokens;
    /**
     * Creates a new TokenLimitReachedException.
     *
     * @since 1.0.0
     *
     * @param string         $message   The exception message.
     * @param int|null       $maxTokens The token limit that was reached, if known.
     * @param \Throwable|null $previous  The previous throwable used for exception chaining.
     */
    public function __construct(string $message = '', ?int $maxTokens = null, ?\Throwable $previous = null)
    {
        parent::__construct($message, 0, $previous);
        $this->maxTokens = $maxTokens;
    }
    /**
     * Returns the token limit that was reached, if known.
     *
     * @since 1.0.0
     *
     * @return int|null The token limit, or null if not provided.
     */
    public function getMaxTokens(): ?int
    {
        return $this->maxTokens;
    }
}