// Copyright 2020 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 <fcntl.h>
#include <gbm.h>
#include <gtest/gtest.h>
#include <unistd.h>

#include <memory>
#include <string>
#include <utility>
#include <vector>

#include "dawn/tests/white_box/VulkanImageWrappingTests.h"

namespace dawn::native::vulkan {

ExternalImageDescriptorVkForTesting::ExternalImageDescriptorVkForTesting()
    : ExternalImageDescriptorVk(ExternalImageType::DmaBuf) {}
ExternalImageExportInfoVkForTesting::ExternalImageExportInfoVkForTesting()
    : ExternalImageExportInfoVk(ExternalImageType::DmaBuf) {}

class ExternalSemaphoreDmaBuf : public VulkanImageWrappingTestBackend::ExternalSemaphore {
  public:
    explicit ExternalSemaphoreDmaBuf(int handle) : mHandle(handle) {}
    ~ExternalSemaphoreDmaBuf() override {
        if (mHandle != -1) {
            close(mHandle);
        }
    }
    int AcquireHandle() {
        int handle = mHandle;
        mHandle = -1;
        return handle;
    }

  private:
    int mHandle = -1;
};

class ExternalTextureDmaBuf : public VulkanImageWrappingTestBackend::ExternalTexture {
  public:
    ExternalTextureDmaBuf(gbm_bo* bo, int fd, uint32_t stride, uint64_t drmModifier)
        : mGbmBo(bo), mFd(fd), stride(stride), drmModifier(drmModifier) {}

    ~ExternalTextureDmaBuf() override {
        if (mFd != -1) {
            close(mFd);
        }
        if (mGbmBo != nullptr) {
            gbm_bo_destroy(mGbmBo);
        }
    }

    int Dup() const { return dup(mFd); }

  private:
    gbm_bo* mGbmBo = nullptr;
    int mFd = -1;

  public:
    const uint32_t stride;
    const uint64_t drmModifier;
};

class VulkanImageWrappingTestBackendDmaBuf : public VulkanImageWrappingTestBackend {
  public:
    explicit VulkanImageWrappingTestBackendDmaBuf(const wgpu::Device& device) {}

    ~VulkanImageWrappingTestBackendDmaBuf() {
        if (mGbmDevice != nullptr) {
            gbm_device_destroy(mGbmDevice);
            mGbmDevice = nullptr;
        }
    }

    std::unique_ptr<ExternalTexture> CreateTexture(uint32_t width,
                                                   uint32_t height,
                                                   wgpu::TextureFormat format,
                                                   wgpu::TextureUsage usage) override {
        EXPECT_EQ(format, wgpu::TextureFormat::RGBA8Unorm);

        gbm_bo* bo = CreateGbmBo(width, height, true);

        return std::make_unique<ExternalTextureDmaBuf>(
            bo, gbm_bo_get_fd(bo), gbm_bo_get_stride_for_plane(bo, 0), gbm_bo_get_modifier(bo));
    }

    wgpu::Texture WrapImage(const wgpu::Device& device,
                            const ExternalTexture* texture,
                            const ExternalImageDescriptorVkForTesting& descriptor,
                            std::vector<std::unique_ptr<ExternalSemaphore>> semaphores) override {
        const ExternalTextureDmaBuf* textureDmaBuf =
            static_cast<const ExternalTextureDmaBuf*>(texture);
        std::vector<int> waitFDs;
        for (auto& semaphore : semaphores) {
            waitFDs.push_back(
                static_cast<ExternalSemaphoreDmaBuf*>(semaphore.get())->AcquireHandle());
        }

        ExternalImageDescriptorDmaBuf descriptorDmaBuf;
        *static_cast<ExternalImageDescriptorVk*>(&descriptorDmaBuf) = descriptor;

        descriptorDmaBuf.memoryFD = textureDmaBuf->Dup();
        descriptorDmaBuf.waitFDs = std::move(waitFDs);

        descriptorDmaBuf.stride = textureDmaBuf->stride;
        descriptorDmaBuf.drmModifier = textureDmaBuf->drmModifier;

        return wgpu::Texture::Acquire(
            dawn::native::vulkan::WrapVulkanImage(device.Get(), &descriptorDmaBuf));
    }

    bool ExportImage(const wgpu::Texture& texture,
                     VkImageLayout layout,
                     ExternalImageExportInfoVkForTesting* exportInfo) override {
        ExternalImageExportInfoDmaBuf infoDmaBuf;
        bool success = ExportVulkanImage(texture.Get(), layout, &infoDmaBuf);

        *static_cast<ExternalImageExportInfoVk*>(exportInfo) = infoDmaBuf;
        for (int fd : infoDmaBuf.semaphoreHandles) {
            EXPECT_NE(fd, -1);
            exportInfo->semaphores.push_back(std::make_unique<ExternalSemaphoreDmaBuf>(fd));
        }

        return success;
    }

    void CreateGbmDevice() {
        // Render nodes [1] are the primary interface for communicating with the GPU on
        // devices that support DRM. The actual filename of the render node is
        // implementation-specific, so we must scan through all possible filenames to find
        // one that we can use [2].
        //
        // [1] https://dri.freedesktop.org/docs/drm/gpu/drm-uapi.html#render-nodes
        // [2]
        // https://cs.chromium.org/chromium/src/ui/ozone/platform/wayland/gpu/drm_render_node_path_finder.cc
        const uint32_t kRenderNodeStart = 128;
        const uint32_t kRenderNodeEnd = kRenderNodeStart + 16;
        const std::string kRenderNodeTemplate = "/dev/dri/renderD";

        int renderNodeFd = -1;
        for (uint32_t i = kRenderNodeStart; i < kRenderNodeEnd; i++) {
            std::string renderNode = kRenderNodeTemplate + std::to_string(i);
            renderNodeFd = open(renderNode.c_str(), O_RDWR);
            if (renderNodeFd >= 0) {
                break;
            }
        }
        EXPECT_GE(renderNodeFd, 0) << "Failed to get file descriptor for render node";

        gbm_device* gbmDevice = gbm_create_device(renderNodeFd);
        EXPECT_NE(gbmDevice, nullptr) << "Failed to create GBM device";
        mGbmDevice = gbmDevice;
    }

  private:
    gbm_bo* CreateGbmBo(uint32_t width, uint32_t height, bool linear) {
        uint32_t flags = GBM_BO_USE_RENDERING;
        if (linear) {
            flags |= GBM_BO_USE_LINEAR;
        }
        gbm_bo* gbmBo = gbm_bo_create(mGbmDevice, width, height, GBM_FORMAT_XBGR8888, flags);
        EXPECT_NE(gbmBo, nullptr) << "Failed to create GBM buffer object";
        return gbmBo;
    }

    gbm_device* mGbmDevice = nullptr;
};

// static
std::unique_ptr<VulkanImageWrappingTestBackend> VulkanImageWrappingTestBackend::Create(
    const wgpu::Device& device) {
    auto backend = std::make_unique<VulkanImageWrappingTestBackendDmaBuf>(device);
    backend->CreateGbmDevice();
    return backend;
}
}  // namespace dawn::native::vulkan