// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.

using System;
using System.Collections.Generic;
using System.Reactive.Concurrency;
using System.Reactive.Disposables;
using Microsoft.Reactive.Testing;

namespace ReactiveTests
{
    public static class Extensions
    {
        //public static IDisposable ScheduleAbsolute(this TestScheduler scheduler, long time, Action action)
        //{
        //    return scheduler.ScheduleAbsolute(default(object), time, (scheduler1, state1) => { action(); return Disposable.Empty; });
        //}

        //public static IDisposable ScheduleRelative(this TestScheduler scheduler, long time, Action action)
        //{
        //    return scheduler.ScheduleRelative(default(object), time, (scheduler1, state1) => { action(); return Disposable.Empty; });
        //}

        public static void EnsureTrampoline(this CurrentThreadScheduler scheduler, Action action)
        {
            if (scheduler.ScheduleRequired)
                scheduler.Schedule(action);
            else
                action();
        }

        public static IEnumerable<R> Zip<T1, T2, R>(this IEnumerable<T1> source1, IEnumerable<T2> source2, Func<T1, T2, R> f)
        {
            using (var e1 = source1.GetEnumerator())
            using (var e2 = source2.GetEnumerator())
                while (e1.MoveNext() && e2.MoveNext())
                    yield return f(e1.Current, e2.Current);
        }
    }
}