<?php

namespace DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise;

/**
 * Get the global task queue used for promise resolution.
 *
 * This task queue MUST be run in an event loop in order for promises to be
 * settled asynchronously. It will be automatically run when synchronously
 * waiting on a promise.
 *
 * <code>
 * while ($eventLoop->isRunning()) {
 *     GuzzleHttp\Promise\queue()->run();
 * }
 * </code>
 *
 * @param TaskQueueInterface $assign Optionally specify a new queue instance.
 *
 * @return TaskQueueInterface
 */
function queue(\DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\TaskQueueInterface $assign = null)
{
    static $queue;
    if ($assign) {
        $queue = $assign;
    } elseif (!$queue) {
        $queue = new \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\TaskQueue();
    }
    return $queue;
}
/**
 * Adds a function to run in the task queue when it is next `run()` and returns
 * a promise that is fulfilled or rejected with the result.
 *
 * @param callable $task Task function to run.
 *
 * @return PromiseInterface
 */
function task(callable $task)
{
    $queue = queue();
    $promise = new \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\Promise([$queue, 'run']);
    $queue->add(function () use($task, $promise) {
        try {
            $promise->resolve($task());
        } catch (\Throwable $e) {
            $promise->reject($e);
        } catch (\Exception $e) {
            $promise->reject($e);
        }
    });
    return $promise;
}
/**
 * Creates a promise for a value if the value is not a promise.
 *
 * @param mixed $value Promise or value.
 *
 * @return PromiseInterface
 */
function promise_for($value)
{
    if ($value instanceof PromiseInterface) {
        return $value;
    }
    // Return a Guzzle promise that shadows the given promise.
    if (method_exists($value, 'then')) {
        $wfn = method_exists($value, 'wait') ? [$value, 'wait'] : null;
        $cfn = method_exists($value, 'cancel') ? [$value, 'cancel'] : null;
        $promise = new \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\Promise($wfn, $cfn);
        $value->then([$promise, 'resolve'], [$promise, 'reject']);
        return $promise;
    }
    return new \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\FulfilledPromise($value);
}
/**
 * Creates a rejected promise for a reason if the reason is not a promise. If
 * the provided reason is a promise, then it is returned as-is.
 *
 * @param mixed $reason Promise or reason.
 *
 * @return PromiseInterface
 */
function rejection_for($reason)
{
    if ($reason instanceof PromiseInterface) {
        return $reason;
    }
    return new \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\RejectedPromise($reason);
}
/**
 * Create an exception for a rejected promise value.
 *
 * @param mixed $reason
 *
 * @return \Exception|\Throwable
 */
function exception_for($reason)
{
    return $reason instanceof \Exception || $reason instanceof \Throwable ? $reason : new \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\RejectionException($reason);
}
/**
 * Returns an iterator for the given value.
 *
 * @param mixed $value
 *
 * @return \Iterator
 */
function iter_for($value)
{
    if ($value instanceof \Iterator) {
        return $value;
    } elseif (is_array($value)) {
        return new \ArrayIterator($value);
    } else {
        return new \ArrayIterator([$value]);
    }
}
/**
 * Synchronously waits on a promise to resolve and returns an inspection state
 * array.
 *
 * Returns a state associative array containing a "state" key mapping to a
 * valid promise state. If the state of the promise is "fulfilled", the array
 * will contain a "value" key mapping to the fulfilled value of the promise. If
 * the promise is rejected, the array will contain a "reason" key mapping to
 * the rejection reason of the promise.
 *
 * @param PromiseInterface $promise Promise or value.
 *
 * @return array
 */
function inspect(\DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\PromiseInterface $promise)
{
    try {
        return ['state' => \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\PromiseInterface::FULFILLED, 'value' => $promise->wait()];
    } catch (RejectionException $e) {
        return ['state' => \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\PromiseInterface::REJECTED, 'reason' => $e->getReason()];
    } catch (\Throwable $e) {
        return ['state' => \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\PromiseInterface::REJECTED, 'reason' => $e];
    } catch (\Exception $e) {
        return ['state' => \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\PromiseInterface::REJECTED, 'reason' => $e];
    }
}
/**
 * Waits on all of the provided promises, but does not unwrap rejected promises
 * as thrown exception.
 *
 * Returns an array of inspection state arrays.
 *
 * @param PromiseInterface[] $promises Traversable of promises to wait upon.
 *
 * @return array
 * @see GuzzleHttp\Promise\inspect for the inspection state array format.
 */
function inspect_all($promises)
{
    $results = [];
    foreach ($promises as $key => $promise) {
        $results[$key] = inspect($promise);
    }
    return $results;
}
/**
 * Waits on all of the provided promises and returns the fulfilled values.
 *
 * Returns an array that contains the value of each promise (in the same order
 * the promises were provided). An exception is thrown if any of the promises
 * are rejected.
 *
 * @param mixed $promises Iterable of PromiseInterface objects to wait on.
 *
 * @return array
 * @throws \Exception on error
 * @throws \Throwable on error in PHP >=7
 */
function unwrap($promises)
{
    $results = [];
    foreach ($promises as $key => $promise) {
        $results[$key] = $promise->wait();
    }
    return $results;
}
/**
 * Given an array of promises, return a promise that is fulfilled when all the
 * items in the array are fulfilled.
 *
 * The promise's fulfillment value is an array with fulfillment values at
 * respective positions to the original array. If any promise in the array
 * rejects, the returned promise is rejected with the rejection reason.
 *
 * @param mixed $promises Promises or values.
 *
 * @return PromiseInterface
 */
function all($promises)
{
    $results = [];
    return each($promises, function ($value, $idx) use(&$results) {
        $results[$idx] = $value;
    }, function ($reason, $idx, \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\Promise $aggregate) {
        $aggregate->reject($reason);
    })->then(function () use(&$results) {
        ksort($results);
        return $results;
    });
}
/**
 * Initiate a competitive race between multiple promises or values (values will
 * become immediately fulfilled promises).
 *
 * When count amount of promises have been fulfilled, the returned promise is
 * fulfilled with an array that contains the fulfillment values of the winners
 * in order of resolution.
 *
 * This prommise is rejected with a {@see GuzzleHttp\Promise\AggregateException}
 * if the number of fulfilled promises is less than the desired $count.
 *
 * @param int   $count    Total number of promises.
 * @param mixed $promises Promises or values.
 *
 * @return PromiseInterface
 */
function some($count, $promises)
{
    $results = [];
    $rejections = [];
    return each($promises, function ($value, $idx, \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\PromiseInterface $p) use(&$results, $count) {
        if ($p->getState() !== \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\PromiseInterface::PENDING) {
            return;
        }
        $results[$idx] = $value;
        if (count($results) >= $count) {
            $p->resolve(null);
        }
    }, function ($reason) use(&$rejections) {
        $rejections[] = $reason;
    })->then(function () use(&$results, &$rejections, $count) {
        if (count($results) !== $count) {
            throw new \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\AggregateException('Not enough promises to fulfill count', $rejections);
        }
        ksort($results);
        return array_values($results);
    });
}
/**
 * Like some(), with 1 as count. However, if the promise fulfills, the
 * fulfillment value is not an array of 1 but the value directly.
 *
 * @param mixed $promises Promises or values.
 *
 * @return PromiseInterface
 */
function any($promises)
{
    return some(1, $promises)->then(function ($values) {
        return $values[0];
    });
}
/**
 * Returns a promise that is fulfilled when all of the provided promises have
 * been fulfilled or rejected.
 *
 * The returned promise is fulfilled with an array of inspection state arrays.
 *
 * @param mixed $promises Promises or values.
 *
 * @return PromiseInterface
 * @see GuzzleHttp\Promise\inspect for the inspection state array format.
 */
function settle($promises)
{
    $results = [];
    return each($promises, function ($value, $idx) use(&$results) {
        $results[$idx] = ['state' => \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\PromiseInterface::FULFILLED, 'value' => $value];
    }, function ($reason, $idx) use(&$results) {
        $results[$idx] = ['state' => \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\PromiseInterface::REJECTED, 'reason' => $reason];
    })->then(function () use(&$results) {
        ksort($results);
        return $results;
    });
}
/**
 * Given an iterator that yields promises or values, returns a promise that is
 * fulfilled with a null value when the iterator has been consumed or the
 * aggregate promise has been fulfilled or rejected.
 *
 * $onFulfilled is a function that accepts the fulfilled value, iterator
 * index, and the aggregate promise. The callback can invoke any necessary side
 * effects and choose to resolve or reject the aggregate promise if needed.
 *
 * $onRejected is a function that accepts the rejection reason, iterator
 * index, and the aggregate promise. The callback can invoke any necessary side
 * effects and choose to resolve or reject the aggregate promise if needed.
 *
 * @param mixed    $iterable    Iterator or array to iterate over.
 * @param callable $onFulfilled
 * @param callable $onRejected
 *
 * @return PromiseInterface
 */
function each($iterable, callable $onFulfilled = null, callable $onRejected = null)
{
    return (new \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\EachPromise($iterable, ['fulfilled' => $onFulfilled, 'rejected' => $onRejected]))->promise();
}
/**
 * Like each, but only allows a certain number of outstanding promises at any
 * given time.
 *
 * $concurrency may be an integer or a function that accepts the number of
 * pending promises and returns a numeric concurrency limit value to allow for
 * dynamic a concurrency size.
 *
 * @param mixed        $iterable
 * @param int|callable $concurrency
 * @param callable     $onFulfilled
 * @param callable     $onRejected
 *
 * @return PromiseInterface
 */
function each_limit($iterable, $concurrency, callable $onFulfilled = null, callable $onRejected = null)
{
    return (new \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\EachPromise($iterable, ['fulfilled' => $onFulfilled, 'rejected' => $onRejected, 'concurrency' => $concurrency]))->promise();
}
/**
 * Like each_limit, but ensures that no promise in the given $iterable argument
 * is rejected. If any promise is rejected, then the aggregate promise is
 * rejected with the encountered rejection.
 *
 * @param mixed        $iterable
 * @param int|callable $concurrency
 * @param callable     $onFulfilled
 *
 * @return PromiseInterface
 */
function each_limit_all($iterable, $concurrency, callable $onFulfilled = null)
{
    return each_limit($iterable, $concurrency, $onFulfilled, function ($reason, $idx, \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\PromiseInterface $aggregate) {
        $aggregate->reject($reason);
    });
}
/**
 * Returns true if a promise is fulfilled.
 *
 * @param PromiseInterface $promise
 *
 * @return bool
 */
function is_fulfilled(\DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\PromiseInterface $promise)
{
    return $promise->getState() === \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\PromiseInterface::FULFILLED;
}
/**
 * Returns true if a promise is rejected.
 *
 * @param PromiseInterface $promise
 *
 * @return bool
 */
function is_rejected(\DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\PromiseInterface $promise)
{
    return $promise->getState() === \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\PromiseInterface::REJECTED;
}
/**
 * Returns true if a promise is fulfilled or rejected.
 *
 * @param PromiseInterface $promise
 *
 * @return bool
 */
function is_settled(\DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\PromiseInterface $promise)
{
    return $promise->getState() !== \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\PromiseInterface::PENDING;
}
/**
 * @see Coroutine
 *
 * @param callable $generatorFn
 *
 * @return PromiseInterface
 */
function coroutine(callable $generatorFn)
{
    return new \DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Promise\Coroutine($generatorFn);
}
