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#include "thread.h"

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

#include <atomic>

Y_UNIT_TEST_SUITE(TSysThreadTest) { 
    struct TIdTester {
        inline TIdTester()
            : Thr(nullptr) 
            , Cur(0)
            , Real(0)
        {
        }

        static inline void* DoRun(void* ptr) {
            ((TIdTester*)ptr)->Run();

            return nullptr; 
        }

        inline void Run() {
            Cur = TThread::CurrentThreadId();
            Real = Thr->Id();
            Numeric = TThread::CurrentThreadNumericId();
        }

        TThread* Thr;
        TThread::TId Cur;
        TThread::TId Real;
        TThread::TId Numeric;
    };

    Y_UNIT_TEST(TestThreadId) { 
        TIdTester tst;
        TThread thr(tst.DoRun, &tst);

        tst.Thr = &thr;

        thr.Start();
        thr.Join();

        UNIT_ASSERT_EQUAL(tst.Cur, tst.Real);
        UNIT_ASSERT(tst.Cur != 0);
        UNIT_ASSERT(tst.Numeric != 0);
        UNIT_ASSERT(tst.Numeric != tst.Real);
    }

    void* ThreadProc(void*) {
        TThread::SetCurrentThreadName("CurrentThreadSetNameTest");
        return nullptr; 
    }

    void* ThreadProc2(void*) {
        return nullptr; 
    }

    void* ThreadProc3(void*) { 
        const auto name = TThread::CurrentThreadName();
        Y_FAKE_READ(name); 
        return nullptr; 
    } 
 
    void* ThreadProc4(void*) { 
        const TString setName = "ThreadName"; 
        TThread::SetCurrentThreadName(setName.data());
 
        const auto getName = TThread::CurrentThreadName();
        if (TThread::CanGetCurrentThreadName()) {
            UNIT_ASSERT_VALUES_EQUAL(setName, getName);
        } else {
            UNIT_ASSERT_VALUES_EQUAL("", getName);
        }
        return nullptr; 
    } 
 
    void* ThreadProcChild(void*) { 
        const auto name = TThread::CurrentThreadName();
        const auto defaultName = GetProgramName(); 
 
        (void)name; 
        (void)defaultName; 
 
#if defined(_darwin_) || defined(_linux_) 
        UNIT_ASSERT_VALUES_EQUAL(name, defaultName); 
#endif 
        return nullptr; 
    } 
 
    void* ThreadProcParent(void*) { 
        const TString setName = "Parent"; 
        TThread::SetCurrentThreadName(setName.data());
 
        TThread thread(&ThreadProcChild, nullptr); 
 
        thread.Start(); 
        thread.Join(); 
 
        const auto getName = TThread::CurrentThreadName();
        if (TThread::CanGetCurrentThreadName()) {
            UNIT_ASSERT_VALUES_EQUAL(setName, getName);
        } else {
            UNIT_ASSERT_VALUES_EQUAL("", getName);
        }
        return nullptr; 
    } 
 
    Y_UNIT_TEST(TestSetThreadName) { 
        TThread thread(&ThreadProc, nullptr); 
        // just check it doesn't crash
        thread.Start();
        thread.Join();
    }

    Y_UNIT_TEST(TestSetThreadName2) { 
        TThread thread(TThread::TParams(&ThreadProc, nullptr, 0).SetName("XXX")); 

        thread.Start();
        thread.Join();
    }

    Y_UNIT_TEST(TestGetThreadName) { 
        TThread thread(&ThreadProc3, nullptr); 
        thread.Start(); 
        thread.Join(); 
    } 
 
    Y_UNIT_TEST(TestSetGetThreadName) { 
        TThread thread(&ThreadProc4, nullptr); 
        thread.Start(); 
        thread.Join(); 
    } 
 
    Y_UNIT_TEST(TestSetGetThreadNameInChildThread) { 
        TThread thread(&ThreadProcParent, nullptr); 
        thread.Start(); 
        thread.Join(); 
    } 
 
    Y_UNIT_TEST(TestDoubleJoin) { 
        TThread thread(&ThreadProc, nullptr); 

        thread.Start();
        thread.Join();

        UNIT_ASSERT_EQUAL(thread.Join(), nullptr); 
    }

    Y_UNIT_TEST(TestDoubleStart) { 
        TThread thread(&ThreadProc, nullptr); 

        thread.Start();
        UNIT_ASSERT_EXCEPTION(thread.Start(), yexception);
        thread.Join();
    }

    Y_UNIT_TEST(TestNoStart) { 
        TThread thread(&ThreadProc, nullptr); 
    }

    Y_UNIT_TEST(TestNoStartJoin) { 
        TThread thread(&ThreadProc, nullptr); 

        UNIT_ASSERT_EQUAL(thread.Join(), nullptr); 
    }

    Y_UNIT_TEST(TestStackPointer) { 
        TArrayHolder<char> buf(new char[64000]);
        TThread thr(TThread::TParams(ThreadProc2, nullptr).SetStackPointer(buf.Get()).SetStackSize(64000)); 

        thr.Start();
        UNIT_ASSERT_VALUES_EQUAL(thr.Join(), nullptr);
    }

    Y_UNIT_TEST(TestStackLimits) { 
        TCurrentThreadLimits sl;

        UNIT_ASSERT(sl.StackBegin);
        UNIT_ASSERT(sl.StackLength > 0);
    }

    Y_UNIT_TEST(TestFunc) {
        std::atomic_bool flag = {false};
        TThread thread([&flag]() { flag = true; });

        thread.Start();
        UNIT_ASSERT_VALUES_EQUAL(thread.Join(), nullptr);
        UNIT_ASSERT(flag);
    }

    Y_UNIT_TEST(TestCopyFunc) {
        std::atomic_bool flag = {false};
        auto func = [&flag]() { flag = true; };

        TThread thread(func);
        thread.Start();
        UNIT_ASSERT_VALUES_EQUAL(thread.Join(), nullptr);

        TThread thread2(func);
        thread2.Start();
        UNIT_ASSERT_VALUES_EQUAL(thread2.Join(), nullptr);

        UNIT_ASSERT(flag);
    }

    Y_UNIT_TEST(TestCallable) {
        std::atomic_bool flag = {false};

        struct TCallable: TMoveOnly {
            std::atomic_bool* Flag_;

            TCallable(std::atomic_bool* flag)
                : Flag_(flag)
            {
            }

            void operator()() {
                *Flag_ = true;
            }
        };

        TCallable foo(&flag);
        TThread thread(std::move(foo));

        thread.Start();
        UNIT_ASSERT_VALUES_EQUAL(thread.Join(), nullptr);
        UNIT_ASSERT(flag);
    }
};