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#include "async.h"

#include <library/cpp/testing/unittest/registar.h>

#include <util/generic/ptr.h>
#include <util/generic/vector.h>

namespace {
    struct TMySuperTaskQueue { 
    }; 

}

namespace NThreading {
    /* Here we provide an Async overload for TMySuperTaskQueue indide NThreading namespace 
 * so that we can call it in the way
 *
 * TMySuperTaskQueue queue;
 * NThreading::Async([](){}, queue);
 *
 * See also ExtensionExample unittest.
 */
    template <typename Func> 
    TFuture<TFunctionResult<Func>> Async(Func func, TMySuperTaskQueue&) { 
        return MakeFuture(func()); 
    } 

}

Y_UNIT_TEST_SUITE(Async) {
    Y_UNIT_TEST(ExtensionExample) {
        TMySuperTaskQueue queue; 
        auto future = NThreading::Async([]() { return 5; }, queue); 
        future.Wait(); 
        UNIT_ASSERT_VALUES_EQUAL(future.GetValue(), 5); 
    } 

    Y_UNIT_TEST(WorksWithIMtpQueue) {
        auto queue = MakeHolder<TThreadPool>();
        queue->Start(1); 

        auto future = NThreading::Async([]() { return 5; }, *queue); 
        future.Wait(); 
        UNIT_ASSERT_VALUES_EQUAL(future.GetValue(), 5); 
    } 

    Y_UNIT_TEST(ProperlyDeducesFutureType) {
        // Compileability test 
        auto queue = CreateThreadPool(1);

        NThreading::TFuture<void> f1 = NThreading::Async([]() {}, *queue); 
        NThreading::TFuture<int> f2 = NThreading::Async([]() { return 5; }, *queue); 
        NThreading::TFuture<double> f3 = NThreading::Async([]() { return 5.0; }, *queue); 
        NThreading::TFuture<TVector<int>> f4 = NThreading::Async([]() { return TVector<int>(); }, *queue); 
        NThreading::TFuture<int> f5 = NThreading::Async([]() { return NThreading::MakeFuture(5); }, *queue); 
    } 
}