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<?php
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namespace GuzzleHttp\Promise;
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final class Create
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{
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    /**
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     * Creates a promise for a value if the value is not a promise.
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     *
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     * @param mixed $value Promise or value.
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     *
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     * @return PromiseInterface
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     */
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    public static function promiseFor($value)
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    {
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        if ($value instanceof PromiseInterface) {
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            return $value;
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        }
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        // Return a Guzzle promise that shadows the given promise.
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        if (is_object($value) && method_exists($value, 'then')) {
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            $wfn = method_exists($value, 'wait') ? [$value, 'wait'] : null;
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            $cfn = method_exists($value, 'cancel') ? [$value, 'cancel'] : null;
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            $promise = new Promise($wfn, $cfn);
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            $value->then([$promise, 'resolve'], [$promise, 'reject']);
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            return $promise;
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        }
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        return new FulfilledPromise($value);
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    }
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    /**
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     * Creates a rejected promise for a reason if the reason is not a promise.
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     * If the provided reason is a promise, then it is returned as-is.
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     *
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     * @param mixed $reason Promise or reason.
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     *
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     * @return PromiseInterface
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     */
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    public static function rejectionFor($reason)
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    {
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        if ($reason instanceof PromiseInterface) {
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            return $reason;
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        }
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        return new RejectedPromise($reason);
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    }
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    /**
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     * Create an exception for a rejected promise value.
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     *
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     * @param mixed $reason
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     *
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     * @return \Exception|\Throwable
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     */
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    public static function exceptionFor($reason)
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    {
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        if ($reason instanceof \Exception || $reason instanceof \Throwable) {
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            return $reason;
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        }
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        return new RejectionException($reason);
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    }
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    /**
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     * Returns an iterator for the given value.
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     *
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     * @param mixed $value
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     *
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     * @return \Iterator
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     */
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    public static function iterFor($value)
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    {
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        if ($value instanceof \Iterator) {
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            return $value;
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        }
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        if (is_array($value)) {
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            return new \ArrayIterator($value);
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        }
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        return new \ArrayIterator([$value]);
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    }
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}