<?php

namespace React\Promise;

/**
* @deprecated 2.8.0 LazyPromise is deprecated and should not be used anymore.
*/
class LazyPromise implements ExtendedPromiseInterface, CancellablePromiseInterface
{
private $factory;
private $promise;

public function __construct(callable $factory)
{
$this->factory = $factory;
}

public function then(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
{
return $this->promise()->then($onFulfilled, $onRejected, $onProgress);
}

public function done(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
{
return $this->promise()->done($onFulfilled, $onRejected, $onProgress);
}

public function otherwise(callable $onRejected)
{
return $this->promise()->otherwise($onRejected);
}

public function always(callable $onFulfilledOrRejected)
{
return $this->promise()->always($onFulfilledOrRejected);
}

public function progress(callable $onProgress)
{
return $this->promise()->progress($onProgress);
}

public function cancel()
{
return $this->promise()->cancel();
}

/**
* @internal
* @see Promise::settle()
*/
public function promise()
{
if (null === $this->promise) {
try {
$this->promise = resolve(\call_user_func($this->factory));
} catch (\Throwable $exception) {
$this->promise = new RejectedPromise($exception);
} catch (\Exception $exception) {
$this->promise = new RejectedPromise($exception);
}
}

return $this->promise;
}
}