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#include "gate/tests.hpp"
#include "gate/functions.hpp"
#include "gate/callstacks.hpp"

using namespace gate;

GATEXX_TEST_UNIT(CallstackTrace)
{
    Callstack::Address addrbuffer[32];
    Result<gate::size_t> traceResult = Callstack::trace(addrbuffer, sizeof(addrbuffer) / sizeof(addrbuffer[0]));
    if (traceResult.hasError() && (traceResult.error() == results::NotSupported))
    {
        /* trace feature not support on platform, tests are meaningless */
    }
    else
    {
        GATEXX_TEST_REQUIRE(traceResult.hasValue());
        gate::size_t addrbuffer_used = traceResult.value();
        GATEXX_TEST_REQUIRE(addrbuffer_used > 0);

        StringBuilder sb;
        VoidResult printResult = Callstack::print(addrbuffer[0], sb);
        GATEXX_TEST_CHECK(!printResult.hasError());
    }
}


static int cs_state = 0;
static Callstack::Context main_context;
static Callstack::Context other_context;

class GATE_API_LOCAL OtherStackCode : public IRunnable
{
public:
    void run() override
    {
        cs_state = 1;
        Callstack::switchTo(other_context, main_context);
    }
};

GATEXX_TEST_UNIT(CallstackRun)
{
    Callstack cs(4096);
    OtherStackCode otherCode;
    cs_state = 0;
    Result<result_t> result = cs.run(main_context, otherCode);
    if (result.hasError() && (result.error() == results::NotSupported))
    {
        /* stack switching is not supported on this platform, further tests are meaningless*/
    }
    else
    {
        GATEXX_TEST_REQUIRE(!result.hasError());
        GATEXX_TEST_CHECK(result.value() == results::Ok);
        GATEXX_TEST_CHECK(cs_state == 1);
    }
}


static int fork_state = 0;

class GATE_API_LOCAL MainForkCode : public IRunnable
{
public:
    Callstack::Anchor anchor;

    void run() override
    {
        GATEXX_TEST_CHECK(fork_state == 0);
        fork_state = 1;
        Callstack::jumpToBranch(this->anchor);
    }
};

class GATE_API_LOCAL BranchCode : public IRunnable
{
public:
    void run() override
    {
        GATEXX_TEST_CHECK(fork_state == 1);
        fork_state = 2;
    }
};

GATEXX_TEST_UNIT(CallstackFork)
{
    MainForkCode maincode;
    BranchCode branchcode;
    fork_state = 0;
    VoidResult result = Callstack::fork(maincode.anchor, maincode, branchcode);
    GATEXX_TEST_CHECK(!result.hasError());
    GATEXX_TEST_CHECK(fork_state == 2);
}


static int test_func_sargs(signed char a, short b, int c, long d, long long e)
{
    return a + b + c + d + static_cast<int>(e);
}

static unsigned int test_func_uargs(unsigned char a, unsigned short b, unsigned int c, unsigned long d, unsigned long long e)
{
    return a + b + c + d + static_cast<unsigned>(e);
}


GATEXX_TEST_UNIT(GenericFunction)
{
    {	// signed int
        FunctionArgument args[5] = {
            static_cast<char>(1),
            static_cast<short>(2),
            static_cast<int>(3),
            static_cast<long>(4),
            static_cast<long long>(5)
        };

        FunctionArgument retval = Function::invokeGeneric((gate_funcptr_t)&test_func_sargs, 0, args, 5);
        retval.getType();
        int iretval = *static_cast<int const*>(retval.getValuePtr());
        GATEXX_TEST_CHECK_EQUAL(iretval, 15);
    }

    {	// unsigned int
        FunctionArgument args[5] = {
            static_cast<unsigned char>(1),
            static_cast<unsigned short>(2),
            static_cast<unsigned int>(3),
            static_cast<unsigned long>(4),
            static_cast<unsigned long long>(5)
        };

        FunctionArgument retval = Function::invokeGeneric((gate_funcptr_t)&test_func_uargs, 0, args, 5);
        retval.getType();
        int iretval = *static_cast<int const*>(retval.getValuePtr());
        GATEXX_TEST_CHECK_EQUAL(iretval, 15);
    }
}

class GATE_CORE_CPP_API GuardedCodeTarget : public gate::IRunnable, public gate::IQuitable
{
public:
    result_t exitResult;

    GuardedCodeTarget(result_t exit_result = results::Ok)
        : exitResult(exit_result)
    {
    }

    virtual ~GuardedCodeTarget() noexcept
    {
    }

    virtual void run() override
    {
        if (this->exitResult == results::UnknownException)
        {
            throw 123;
        }
        GATEXX_CHECK_EXCEPTION(this->exitResult);
    }

    virtual void quit() override
    {
    }
};

GATEXX_TEST_UNIT(InvokeGuarded)
{
    {
        GuardedCodeTarget noThrowCode(results::Ok);
        GATEXX_TEST_CHECK_NOTHROW(Function::invokeGuarded(noThrowCode));
        noThrowCode.quit();
    }
    {
        GuardedCodeTarget throwCode(results::Failed);
        GATEXX_TEST_CHECK_THROW(Function::invokeGuarded(throwCode));
    }
    {
        GuardedCodeTarget foreignCxxThrowCode(results::UnknownException);
        GATEXX_TEST_CHECK_THROW(Function::invokeGuarded(foreignCxxThrowCode));
    }
}