// Copyright 2023 The Dawn & Tint Authors
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#include "src/dawn/tests/unittests/native/mocks/DawnMockTest.h"

#include <utility>

#include "dawn/dawn_proc.h"
#include "src/dawn/native/ChainUtils.h"

using testing::_;
using testing::AtMost;

namespace dawn::native {

DawnMockTest::DawnMockTest() : mDeviceToggles(ToggleStage::Device) {}

void DawnMockTest::SetUp() {
    dawnProcSetProcs(&dawn::native::GetProcs());
    Ref<InstanceBase> instance = APICreateInstance(nullptr);
    const auto& adapters = instance->EnumerateAdapters();
    DAWN_ASSERT(!adapters.empty());

    wgpu::DeviceDescriptor desc = {};
    desc.SetDeviceLostCallback(wgpu::CallbackMode::AllowSpontaneous,
                               mDeviceLostCallback.Callback());
    desc.SetUncapturedErrorCallback(mDeviceErrorCallback.TemplatedCallback(),
                                    mDeviceErrorCallback.TemplatedCallbackUserdata());
    desc.requiredFeatureCount = mRequiredFeatures.size();
    desc.requiredFeatures = mRequiredFeatures.data();
    DeviceDescriptor* nativeDesc = reinterpret_cast<DeviceDescriptor*>(&desc);

    auto result = ValidateAndUnpack(nativeDesc);
    DAWN_ASSERT(result.IsSuccess());
    UnpackedPtr<DeviceDescriptor> unpackedDesc = result.AcquireSuccess();

    Ref<DeviceBase::DeviceLostEvent> lostEvent = DeviceBase::DeviceLostEvent::Create(nativeDesc);

    mDeviceToggles.SetForTesting(Toggle::AllowUnsafeAPIs, true, true);
    auto deviceMock = AcquireRef(new ::testing::NiceMock<DeviceMock>(
        adapters[0].Get(), unpackedDesc, mDeviceToggles, lostEvent.Get()));
    mDeviceMock = deviceMock.Get();
    device = wgpu::Device::Acquire(ToAPI(ReturnToAPI<DeviceBase>(std::move(deviceMock))));
    instance->GetEventManager()->TrackEvent(std::move(lostEvent));
}

void DawnMockTest::DropDevice() {
    if (device == nullptr) {
        return;
    }

    EXPECT_CALL(mDeviceLostCallback, Call(CHandleIs(nullptr), wgpu::DeviceLostReason::Destroyed, _))
        .Times(AtMost(1));

    // Since the device owns the instance in these tests, we need to explicitly verify that the
    // instance has completed all work. To do this, we take an additional ref to the instance here
    // and use it to process events until completion after dropping the device.
    Ref<InstanceBase> instance = mDeviceMock->GetInstance();

    mDeviceMock = nullptr;
    device = nullptr;

    do {
    } while (instance->ProcessEvents());
    instance = nullptr;
}

DawnMockTest::~DawnMockTest() {
    DropDevice();
    dawnProcSetProcs(nullptr);
}

void DawnMockTest::ProcessEvents() {
    mDeviceMock->GetInstance()->ProcessEvents();
}

}  // namespace dawn::native
