// Copyright 2018 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/validation/ValidationTest.h"

#include "utils/WGPUHelpers.h"

namespace {

class QueueSubmitValidationTest : public ValidationTest {
};

static void StoreTrueMapWriteCallback(WGPUBufferMapAsyncStatus status,
                                      void*,
                                      uint64_t,
                                      void* userdata) {
    *static_cast<bool*>(userdata) = true;
}

// Test submitting with a mapped buffer is disallowed
TEST_F(QueueSubmitValidationTest, SubmitWithMappedBuffer) {
    // Create a map-write buffer.
    wgpu::BufferDescriptor descriptor;
    descriptor.usage = wgpu::BufferUsage::MapWrite | wgpu::BufferUsage::CopySrc;
    descriptor.size = 4;
    wgpu::Buffer buffer = device.CreateBuffer(&descriptor);

    // Create a fake copy destination buffer
    descriptor.usage = wgpu::BufferUsage::CopyDst;
    wgpu::Buffer targetBuffer = device.CreateBuffer(&descriptor);

    // Create a command buffer that reads from the mappable buffer.
    wgpu::CommandBuffer commands;
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        encoder.CopyBufferToBuffer(buffer, 0, targetBuffer, 0, 4);
        commands = encoder.Finish();
    }

    wgpu::Queue queue = device.GetDefaultQueue();

    // Submitting when the buffer has never been mapped should succeed
    queue.Submit(1, &commands);

    // Map the buffer, submitting when the buffer is mapped should fail
    bool mapWriteFinished = false;
    buffer.MapWriteAsync(StoreTrueMapWriteCallback, &mapWriteFinished);
    queue.Submit(0, nullptr);
    ASSERT_TRUE(mapWriteFinished);

    ASSERT_DEVICE_ERROR(queue.Submit(1, &commands));

    // Unmap the buffer, queue submit should succeed
    buffer.Unmap();
    queue.Submit(1, &commands);
}

class QueueWriteBufferValidationTest : public ValidationTest {
  private:
    void SetUp() override {
        ValidationTest::SetUp();
        queue = device.GetDefaultQueue();
    }

  protected:
    wgpu::Buffer CreateBuffer(uint64_t size) {
        wgpu::BufferDescriptor descriptor;
        descriptor.size = size;
        descriptor.usage = wgpu::BufferUsage::CopyDst;
        return device.CreateBuffer(&descriptor);
    }

    wgpu::Queue queue;
};

// Test the success case for WriteBuffer
TEST_F(QueueWriteBufferValidationTest, Success) {
    wgpu::Buffer buf = CreateBuffer(4);

    uint32_t foo = 0x01020304;
    queue.WriteBuffer(buf, 0, &foo, sizeof(foo));
}

// Test error case for WriteBuffer out of bounds
TEST_F(QueueWriteBufferValidationTest, OutOfBounds) {
    wgpu::Buffer buf = CreateBuffer(4);

    uint32_t foo[2] = {0, 0};
    ASSERT_DEVICE_ERROR(queue.WriteBuffer(buf, 0, foo, 8));
}

// Test error case for WriteBuffer out of bounds with an overflow
TEST_F(QueueWriteBufferValidationTest, OutOfBoundsOverflow) {
    wgpu::Buffer buf = CreateBuffer(1024);

    uint32_t foo[2] = {0, 0};

    // An offset that when added to "4" would overflow to be zero and pass validation without
    // overflow checks.
    uint64_t offset = uint64_t(int64_t(0) - int64_t(4));

    ASSERT_DEVICE_ERROR(queue.WriteBuffer(buf, offset, foo, 4));
}

// Test error case for WriteBuffer with the wrong usage
TEST_F(QueueWriteBufferValidationTest, WrongUsage) {
    wgpu::BufferDescriptor descriptor;
    descriptor.size = 4;
    descriptor.usage = wgpu::BufferUsage::Vertex;
    wgpu::Buffer buf = device.CreateBuffer(&descriptor);

    uint32_t foo = 0;
    ASSERT_DEVICE_ERROR(queue.WriteBuffer(buf, 0, &foo, sizeof(foo)));
}

// Test WriteBuffer with unaligned size
TEST_F(QueueWriteBufferValidationTest, UnalignedSize) {
    wgpu::Buffer buf = CreateBuffer(4);

    uint16_t value = 123;
    ASSERT_DEVICE_ERROR(queue.WriteBuffer(buf, 0, &value, sizeof(value)));
}

// Test WriteBuffer with unaligned offset
TEST_F(QueueWriteBufferValidationTest, UnalignedOffset) {
    wgpu::Buffer buf = CreateBuffer(8);

    uint32_t value = 0x01020304;
    ASSERT_DEVICE_ERROR(queue.WriteBuffer(buf, 2, &value, sizeof(value)));
}

// Test WriteBuffer with destroyed buffer
TEST_F(QueueWriteBufferValidationTest, DestroyedBuffer) {
    wgpu::Buffer buf = CreateBuffer(4);
    buf.Destroy();

    uint32_t value = 0;
    ASSERT_DEVICE_ERROR(queue.WriteBuffer(buf, 0, &value, sizeof(value)));
}

// Test WriteBuffer with mapped buffer
TEST_F(QueueWriteBufferValidationTest, MappedBuffer) {
    // CreateBufferMapped
    {
        wgpu::BufferDescriptor descriptor;
        descriptor.size = 4;
        descriptor.usage = wgpu::BufferUsage::CopyDst;
        wgpu::CreateBufferMappedResult result = device.CreateBufferMapped(&descriptor);

        uint32_t value = 0;
        ASSERT_DEVICE_ERROR(queue.WriteBuffer(result.buffer, 0, &value, sizeof(value)));
    }

    // MapReadAsync
    {
        wgpu::BufferDescriptor descriptor;
        descriptor.size = 4;
        descriptor.usage = wgpu::BufferUsage::CopyDst | wgpu::BufferUsage::MapRead;
        wgpu::Buffer buf = device.CreateBuffer(&descriptor);

        buf.MapReadAsync(nullptr, nullptr);
        uint32_t value = 0;
        ASSERT_DEVICE_ERROR(queue.WriteBuffer(buf, 0, &value, sizeof(value)));
    }

    // MapWriteAsync
    {
        wgpu::BufferDescriptor descriptor;
        descriptor.size = 4;
        descriptor.usage = wgpu::BufferUsage::CopyDst | wgpu::BufferUsage::MapRead;
        wgpu::Buffer buf = device.CreateBuffer(&descriptor);

        buf.MapReadAsync(nullptr, nullptr);
        uint32_t value = 0;
        ASSERT_DEVICE_ERROR(queue.WriteBuffer(buf, 0, &value, sizeof(value)));
    }
}

}  // anonymous namespace