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#include "legacy_future.h"

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

namespace NThreading {
    Y_UNIT_TEST_SUITE(TLegacyFutureTest) {
        int intf() { 
            return 17; 
        } 

        Y_UNIT_TEST(TestIntFunction) {
            TLegacyFuture<int> f((&intf)); 
            UNIT_ASSERT_VALUES_EQUAL(17, f.Get()); 
        } 

        static int r; 

        void voidf() { 
            r = 18; 
        } 

        Y_UNIT_TEST(TestVoidFunction) {
            r = 0; 
            TLegacyFuture<> f((&voidf)); 
            f.Get(); 
            UNIT_ASSERT_VALUES_EQUAL(18, r); 
        } 

        struct TSampleClass { 
            int mValue; 

            TSampleClass(int value) 
                : mValue(value) 
            { 
            } 

            int Calc() { 
                return mValue + 1; 
            } 
        }; 

        Y_UNIT_TEST(TestMethod) {
            TLegacyFuture<int> f11(std::bind(&TSampleClass::Calc, TSampleClass(3))); 
            UNIT_ASSERT_VALUES_EQUAL(4, f11.Get()); 

            TLegacyFuture<int> f12(std::bind(&TSampleClass::Calc, TSampleClass(3)), SystemThreadFactory());
            UNIT_ASSERT_VALUES_EQUAL(4, f12.Get()); 

            TSampleClass c(5); 

            TLegacyFuture<int> f21(std::bind(&TSampleClass::Calc, std::ref(c))); 
            UNIT_ASSERT_VALUES_EQUAL(6, f21.Get()); 

            TLegacyFuture<int> f22(std::bind(&TSampleClass::Calc, std::ref(c)), SystemThreadFactory());
            UNIT_ASSERT_VALUES_EQUAL(6, f22.Get()); 
        } 

        struct TSomeThreadPool: public IThreadFactory {};

        Y_UNIT_TEST(TestFunction) {
            std::function<int()> f((&intf)); 

            UNIT_ASSERT_VALUES_EQUAL(17, TLegacyFuture<int>(f).Get()); 
            UNIT_ASSERT_VALUES_EQUAL(17, TLegacyFuture<int>(f, SystemThreadFactory()).Get());

            if (false) { 
                TSomeThreadPool* q = nullptr; 
                TLegacyFuture<int>(f, q); // just check compiles, do not start 
            } 
        }
    }

}