<?php

namespace Amp;

use Amp\Internal\FutureState;
use Revolt\EventLoop;
use Revolt\EventLoop\UnsupportedFeatureException;

/**
 * Creates a new fiber asynchronously using the given closure, returning a Future that is completed with the
 * eventual return value of the passed function or will fail if the closure throws an exception.
 *
 * @template T
 *
 * @param \Closure(...):T $closure
 * @param mixed ...$args Arguments forwarded to the closure when starting the fiber.
 *
 * @return Future<T>
 */
function async(\Closure $closure, mixed ...$args): Future
{
	static $run = null;

	$run ??= static function (FutureState $state, \Closure $closure, array $args): void {
	$s = $state;
	$c = $closure;

	/* Null function arguments so an exception thrown from the closure does not contain the FutureState object
	 * in the stack trace, which would create a circular reference, preventing immediate garbage collection */
	$state = $closure = null;

	try {
	    // Clear $args to allow garbage collection of arguments during fiber execution
	    $s->complete($c(...$args, ...($args = [])));
	} catch (\Throwable $exception) {
	    $s->error($exception);
	}
	};

	$state = new FutureState;

	EventLoop::queue($run, $state, $closure, $args);

	return new Future($state);
}

/**
 * Returns the current time relative to an arbitrary point in time.
 *
 * @return float Time in seconds.
 */
function now(): float
{
	return (float) \hrtime(true) / 1_000_000_000;
}

/**
 * Non-blocking sleep for the specified number of seconds.
 *
 * @param float $timeout Number of seconds to wait.
 * @param bool $reference If false, unreference the underlying watcher.
 * @param Cancellation|null $cancellation Cancel waiting if cancellation is requested.
 */
function delay(float $timeout, bool $reference = true, ?Cancellation $cancellation = null): void
{
	$suspension = EventLoop::getSuspension();
	$callbackId = EventLoop::delay($timeout, static fn () => $suspension->resume());
	$cancellationId = $cancellation?->subscribe(
	static fn (CancelledException $exception) => $suspension->throw($exception)
	);

	if (!$reference) {
	EventLoop::unreference($callbackId);
	}

	try {
	$suspension->suspend();
	} finally {
	EventLoop::cancel($callbackId);

	/** @psalm-suppress PossiblyNullArgument $cancellationId will not be null if $cancellation is not null. */
	$cancellation?->unsubscribe($cancellationId);
	}
}

/**
 * Wait for signal(s) in a non-blocking way.
 *
 * @param int|int[] $signals Signal number or array of signal numbers.
 * @param bool $reference If false, unreference the underlying watcher.
 * @param Cancellation|null $cancellation Cancel waiting if cancellation is requested.
 *
 * @return int Caught signal number.
 * @throws UnsupportedFeatureException
 */
function trapSignal(int|array $signals, bool $reference = true, ?Cancellation $cancellation = null): int
{
	$suspension = EventLoop::getSuspension();
	$callback = static fn (string $watcher, int $signal) => $suspension->resume($signal);
	$id = $cancellation?->subscribe(static fn (CancelledException $exception) => $suspension->throw($exception));

	$callbackIds = [];

	if (\is_int($signals)) {
	$signals = [$signals];
	}

	foreach ($signals as $signo) {
	$callbackIds[] = $callbackId = EventLoop::onSignal($signo, $callback);
	if (!$reference) {
	    EventLoop::unreference($callbackId);
	}
	}

	try {
	return $suspension->suspend();
	} finally {
	foreach ($callbackIds as $callbackId) {
	    EventLoop::cancel($callbackId);
	}

	/** @psalm-suppress PossiblyNullArgument $id will not be null if $cancellation is not null. */
	$cancellation?->unsubscribe($id);
	}
}

/**
 * Returns a Closure that maintains a weak reference to any $this object held by the Closure (a weak-Closure).
 * This allows a class to hold a self-referencing Closure without creating a circular reference that would
 * prevent or delay automatic garbage collection.
 * Invoking the returned Closure after the object is destroyed will throw an instance of Error.
 *
 * @template TReturn
 *
 * @param \Closure(mixed...):TReturn $closure
 *
 * @return \Closure(mixed...):TReturn
 */
function weakClosure(\Closure $closure): \Closure
{
	$reflection = new \ReflectionFunction($closure);

	$that = $reflection->getClosureThis();
	if (!$that) {
	return $closure;
	}

	// For internal classes use \Closure::bindTo() without scope.
	$scope = $reflection->getClosureScopeClass();
	$useBindTo = !$scope || $that::class !== $scope->name || $scope->isInternal();

	$method = $reflection->getShortName();
	if ($method !== '{closure}') {
	// Closure from first-class callable or \Closure::fromCallable(), declare an anonymous closure to rebind.
	/** @psalm-suppress InvalidScope Closure is bound before being invoked. */
	$closure = fn (mixed ...$args): mixed => $this->{$method}(...$args);
	if ($useBindTo && $scope) {
	    $closure = $closure->bindTo(null, $scope->name);

	    if (!$closure) {
	        throw new \RuntimeException('Unable to rebind function to type ' . $scope->name);
	    }
	}
	} else {
	// Rebind to remove reference to $that
	$closure = $closure->bindTo(new \stdClass());
	}

	$reference = \WeakReference::create($that);

	/** @var \Closure(mixed...):TReturn */
	return static function (mixed ...$args) use ($reference, $closure, $useBindTo): mixed {
	$that = $reference->get();
	if (!$that) {
	    throw new \Error('Weakened closure invoked after referenced object destroyed');
	}

	if ($useBindTo) {
	    $closure = $closure->bindTo($that);

	    if (!$closure) {
	        throw new \RuntimeException('Unable to rebind function to object of type ' . $that::class);
	    }

	    return $closure(...$args);
	}

	return $closure->call($that, ...$args);
	};
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MTYxMTY3MzM5MzE4MDkzOCA2MzQxNDYzMDA5NDg0NTA3IDM3Mzk1ODkyMDcxNTc5ODQ=