// Copyright 2021 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "tests/unittests/wire/WireTest.h"

#include "dawn_wire/WireClient.h"

using namespace testing;
using namespace dawn::wire;

class MockQueueWorkDoneCallback {
  public:
    MOCK_METHOD(void, Call, (WGPUQueueWorkDoneStatus status, void* userdata));
};

static std::unique_ptr<MockQueueWorkDoneCallback> mockQueueWorkDoneCallback;
static void ToMockQueueWorkDone(WGPUQueueWorkDoneStatus status, void* userdata) {
    mockQueueWorkDoneCallback->Call(status, userdata);
}

class WireQueueTests : public WireTest {
  protected:
    void SetUp() override {
        WireTest::SetUp();
        mockQueueWorkDoneCallback = std::make_unique<MockQueueWorkDoneCallback>();
    }

    void TearDown() override {
        WireTest::TearDown();
        mockQueueWorkDoneCallback = nullptr;
    }

    void FlushServer() {
        WireTest::FlushServer();
        Mock::VerifyAndClearExpectations(&mockQueueWorkDoneCallback);
    }
};

// Test that a successful OnSubmittedWorkDone call is forwarded to the client.
TEST_F(WireQueueTests, OnSubmittedWorkDoneSuccess) {
    wgpuQueueOnSubmittedWorkDone(queue, 0u, ToMockQueueWorkDone, this);
    EXPECT_CALL(api, OnQueueOnSubmittedWorkDone(apiQueue, 0u, _, _))
        .WillOnce(InvokeWithoutArgs([&]() {
            api.CallQueueOnSubmittedWorkDoneCallback(apiQueue, WGPUQueueWorkDoneStatus_Success);
        }));
    FlushClient();

    EXPECT_CALL(*mockQueueWorkDoneCallback, Call(WGPUQueueWorkDoneStatus_Success, this)).Times(1);
    FlushServer();
}

// Test that an error OnSubmittedWorkDone call is forwarded as an error to the client.
TEST_F(WireQueueTests, OnSubmittedWorkDoneError) {
    wgpuQueueOnSubmittedWorkDone(queue, 0u, ToMockQueueWorkDone, this);
    EXPECT_CALL(api, OnQueueOnSubmittedWorkDone(apiQueue, 0u, _, _))
        .WillOnce(InvokeWithoutArgs([&]() {
            api.CallQueueOnSubmittedWorkDoneCallback(apiQueue, WGPUQueueWorkDoneStatus_Error);
        }));
    FlushClient();

    EXPECT_CALL(*mockQueueWorkDoneCallback, Call(WGPUQueueWorkDoneStatus_Error, this)).Times(1);
    FlushServer();
}

// Test registering an OnSubmittedWorkDone then disconnecting the wire calls the callback with
// device loss
TEST_F(WireQueueTests, OnSubmittedWorkDoneBeforeDisconnect) {
    wgpuQueueOnSubmittedWorkDone(queue, 0u, ToMockQueueWorkDone, this);
    EXPECT_CALL(api, OnQueueOnSubmittedWorkDone(apiQueue, 0u, _, _))
        .WillOnce(InvokeWithoutArgs([&]() {
            api.CallQueueOnSubmittedWorkDoneCallback(apiQueue, WGPUQueueWorkDoneStatus_Error);
        }));
    FlushClient();

    EXPECT_CALL(*mockQueueWorkDoneCallback, Call(WGPUQueueWorkDoneStatus_DeviceLost, this))
        .Times(1);
    GetWireClient()->Disconnect();
}

// Test registering an OnSubmittedWorkDone after disconnecting the wire calls the callback with
// device loss
TEST_F(WireQueueTests, OnSubmittedWorkDoneAfterDisconnect) {
    GetWireClient()->Disconnect();

    EXPECT_CALL(*mockQueueWorkDoneCallback, Call(WGPUQueueWorkDoneStatus_DeviceLost, this))
        .Times(1);
    wgpuQueueOnSubmittedWorkDone(queue, 0u, ToMockQueueWorkDone, this);
}

// Hack to pass in test context into user callback
struct TestData {
    WireQueueTests* pTest;
    WGPUQueue* pTestQueue;
    size_t numRequests;
};

static void ToMockQueueWorkDoneWithNewRequests(WGPUQueueWorkDoneStatus status, void* userdata) {
    TestData* testData = reinterpret_cast<TestData*>(userdata);
    // Mimic the user callback is sending new requests
    ASSERT_NE(testData, nullptr);
    ASSERT_NE(testData->pTest, nullptr);
    ASSERT_NE(testData->pTestQueue, nullptr);
    mockQueueWorkDoneCallback->Call(status, testData->pTest);

    // Send the requests a number of times
    for (size_t i = 0; i < testData->numRequests; i++) {
        wgpuQueueOnSubmittedWorkDone(*(testData->pTestQueue), 0u, ToMockQueueWorkDone,
                                     testData->pTest);
    }
}

// Test that requests inside user callbacks before disconnect are called
TEST_F(WireQueueTests, OnSubmittedWorkDoneInsideCallbackBeforeDisconnect) {
    TestData testData = {this, &queue, 10};
    wgpuQueueOnSubmittedWorkDone(queue, 0u, ToMockQueueWorkDoneWithNewRequests, &testData);
    EXPECT_CALL(api, OnQueueOnSubmittedWorkDone(apiQueue, 0u, _, _))
        .WillOnce(InvokeWithoutArgs([&]() {
            api.CallQueueOnSubmittedWorkDoneCallback(apiQueue, WGPUQueueWorkDoneStatus_Error);
        }));
    FlushClient();

    EXPECT_CALL(*mockQueueWorkDoneCallback, Call(WGPUQueueWorkDoneStatus_DeviceLost, this))
        .Times(1 + testData.numRequests);
    GetWireClient()->Disconnect();
}

// Only one default queue is supported now so we cannot test ~Queue triggering ClearAllCallbacks
// since it is always destructed after the test TearDown, and we cannot create a new queue obj
// with wgpuDeviceGetQueue