// 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 "src/dawn_node/binding/GPUQueue.h"

#include <memory>

#include "src/dawn_node/binding/Converter.h"
#include "src/dawn_node/binding/GPUBuffer.h"
#include "src/dawn_node/binding/GPUCommandBuffer.h"
#include "src/dawn_node/utils/Debug.h"

namespace wgpu { namespace binding {

    ////////////////////////////////////////////////////////////////////////////////
    // wgpu::bindings::GPUQueue
    ////////////////////////////////////////////////////////////////////////////////
    GPUQueue::GPUQueue(wgpu::Queue queue, std::shared_ptr<AsyncRunner> async)
        : queue_(std::move(queue)), async_(std::move(async)) {
    }

    void GPUQueue::submit(
        Napi::Env env,
        std::vector<interop::Interface<interop::GPUCommandBuffer>> commandBuffers) {
        std::vector<wgpu::CommandBuffer> bufs(commandBuffers.size());
        for (size_t i = 0; i < commandBuffers.size(); i++) {
            bufs[i] = *commandBuffers[i].As<GPUCommandBuffer>();
        }
        Converter conv(env);
        uint32_t bufs_size;
        if (!conv(bufs_size, bufs.size())) {
            return;
        }
        queue_.Submit(bufs_size, bufs.data());
    }

    interop::Promise<void> GPUQueue::onSubmittedWorkDone(Napi::Env env) {
        struct Context {
            Napi::Env env;
            interop::Promise<void> promise;
            AsyncTask task;
        };
        auto ctx = new Context{env, interop::Promise<void>(env), async_};
        auto promise = ctx->promise;

        queue_.OnSubmittedWorkDone(
            0,
            [](WGPUQueueWorkDoneStatus status, void* userdata) {
                auto c = std::unique_ptr<Context>(static_cast<Context*>(userdata));
                if (status != WGPUQueueWorkDoneStatus::WGPUQueueWorkDoneStatus_Success) {
                    Napi::Error::New(c->env, "onSubmittedWorkDone() failed")
                        .ThrowAsJavaScriptException();
                }
                c->promise.Resolve();
            },
            ctx);

        return promise;
    }

    void GPUQueue::writeBuffer(Napi::Env env,
                               interop::Interface<interop::GPUBuffer> buffer,
                               interop::GPUSize64 bufferOffset,
                               interop::BufferSource data,
                               interop::GPUSize64 dataOffset,
                               std::optional<interop::GPUSize64> size) {
        wgpu::Buffer buf = *buffer.As<GPUBuffer>();
        Converter::BufferSource src{};
        Converter conv(env);
        if (!conv(src, data)) {
            return;
        }

        // TODO(crbug.com/dawn/1132): Bounds check
        if (src.data) {
            src.data = reinterpret_cast<uint8_t*>(src.data) + dataOffset;
        }
        src.size -= dataOffset;
        if (size.has_value()) {
            src.size = size.value();
        }

        queue_.WriteBuffer(buf, bufferOffset, src.data, src.size);
    }

    void GPUQueue::writeTexture(Napi::Env env,
                                interop::GPUImageCopyTexture destination,
                                interop::BufferSource data,
                                interop::GPUImageDataLayout dataLayout,
                                interop::GPUExtent3D size) {
        wgpu::ImageCopyTexture dst{};
        Converter::BufferSource src{};
        wgpu::TextureDataLayout layout{};
        wgpu::Extent3D sz{};
        Converter conv(env);
        if (!conv(dst, destination) ||    //
            !conv(src, data) ||           //
            !conv(layout, dataLayout) ||  //
            !conv(sz, size)) {
            return;
        }

        queue_.WriteTexture(&dst, src.data, src.size, &layout, &sz);
    }

    void GPUQueue::copyExternalImageToTexture(Napi::Env,
                                              interop::GPUImageCopyExternalImage source,
                                              interop::GPUImageCopyTextureTagged destination,
                                              interop::GPUExtent3D copySize) {
        UNIMPLEMENTED();
    }

    std::optional<std::string> GPUQueue::getLabel(Napi::Env) {
        UNIMPLEMENTED();
    }

    void GPUQueue::setLabel(Napi::Env, std::optional<std::string> value) {
        UNIMPLEMENTED();
    }

}}  // namespace wgpu::binding