<?php

namespace Sabre\Event\Promise;

use Sabre\Event\Promise;
use Throwable;

/**
 * This function takes an array of Promises, and returns a Promise that
 * resolves when all the given arguments have resolved.
 *
 * The returned Promise will resolve with a value that's an array of all the
 * values the given promises have been resolved with.
 *
 * This array will be in the exact same order as the array of input promises.
 *
 * If any of the given Promises fails, the returned promise will immediately
 * fail with the first Promise that fails, and its reason.
 *
 * @param Promise[] $promises
 */
function all(array $promises): Promise
{
    return new Promise(function ($success, $fail) use ($promises) {
    if (empty($promises)) {
        $success([]);

        return;
    }

    $successCount = 0;
    $completeResult = [];

    foreach ($promises as $promiseIndex => $subPromise) {
        $subPromise->then(
            function ($result) use ($promiseIndex, &$completeResult, &$successCount, $success, $promises) {
                $completeResult[$promiseIndex] = $result;
                ++$successCount;
                if ($successCount === count($promises)) {
                    $success($completeResult);
                }

                return $result;
            }
        )->otherwise(
            function ($reason) use ($fail) {
                $fail($reason);
            }
        );
    }
    });
}

/**
 * The race function returns a promise that resolves or rejects as soon as
 * one of the promises in the argument resolves or rejects.
 *
 * The returned promise will resolve or reject with the value or reason of
 * that first promise.
 *
 * @param Promise[] $promises
 */
function race(array $promises): Promise
{
    return new Promise(function ($success, $fail) use ($promises) {
    $alreadyDone = false;
    foreach ($promises as $promise) {
        $promise->then(
            function ($result) use ($success, &$alreadyDone) {
                if ($alreadyDone) {
                    return;
                }
                $alreadyDone = true;
                $success($result);
            },
            function ($reason) use ($fail, &$alreadyDone) {
                if ($alreadyDone) {
                    return;
                }
                $alreadyDone = true;
                $fail($reason);
            }
        );
    }
    });
}

/**
 * Returns a Promise that resolves with the given value.
 *
 * If the value is a promise, the returned promise will attach itself to that
 * promise and eventually get the same state as the followed promise.
 *
 * @param mixed $value
 */
function resolve($value): Promise
{
    if ($value instanceof Promise) {
    return $value->then();
    } else {
    $promise = new Promise();
    $promise->fulfill($value);

    return $promise;
    }
}

/**
 * Returns a Promise that will reject with the given reason.
 */
function reject(Throwable $reason): Promise
{
    $promise = new Promise();
    $promise->reject($reason);

    return $promise;
}
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