<?php

namespace Amp\Parallel\Worker;

use function Amp\Parallel\Sync\formatFlattenedBacktrace;

final class TaskFailureException extends TaskException implements TaskFailureThrowable
{
    /** @var string */
    private $originalMessage;

    /** @var int|string */
    private $originalCode;

    /** @var string[] */
    private $originalTrace;

    /**
     * @param string                    $className Original exception class name.
     * @param string                    $message   Original exception message.
     * @param int|string                $code      Original exception code.
     * @param array                     $trace     Backtrace generated by
     *                                             {@see \Amp\Parallel\Sync\flattenThrowableBacktrace()}.
     * @param TaskFailureThrowable|null $previous  Instance representing any previous exception thrown in the Task.
     */
    public function __construct(string $className, string $message, $code, array $trace, ?TaskFailureThrowable $previous = null)
    {
        $format = 'Uncaught %s in worker with message "%s" and code "%s"; use %s::getOriginalTrace() '
            . 'for the stack trace in the worker';

        parent::__construct(
            $className,
            \sprintf($format, $className, $message, $code, self::class),
            formatFlattenedBacktrace($trace),
            $previous
        );

        $this->originalMessage = $message;
        $this->originalCode = $code;
        $this->originalTrace = $trace;
    }

    /**
     * @return string Original exception class name.
     */
    public function getOriginalClassName(): string
    {
        return $this->getName();
    }

    /**
     * @return string Original exception message.
     */
    public function getOriginalMessage(): string
    {
        return $this->originalMessage;
    }

    /**
     * @return int|string Original exception code.
     */
    public function getOriginalCode()
    {
        return $this->originalCode;
    }

    /**
     * Returns the original exception stack trace.
     *
     * @return array Same as {@see Throwable::getTrace()}, except all function arguments are formatted as strings.
     */
    public function getOriginalTrace(): array
    {
        return $this->originalTrace;
    }

    /**
     * Original backtrace flattened to a human-readable string.
     */
    public function getOriginalTraceAsString(): string
    {
        return $this->getWorkerTrace();
    }
}
