// Copyright 2021 The Dawn & Tint Authors
//
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//    this list of conditions and the following disclaimer in the documentation
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#include "src/dawn/node/binding/GPUQueue.h"

#include <cassert>
#include <limits>
#include <memory>
#include <utility>

#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::binding {

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

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) {
    auto ctx = std::make_unique<AsyncContext<void>>(env, PROMISE_INFO, async_);
    auto promise = ctx->promise;

    queue_.OnSubmittedWorkDone(
        wgpu::CallbackMode::AllowProcessEvents,
        [ctx = std::move(ctx)](wgpu::QueueWorkDoneStatus status, wgpu::StringView message) {
            if (status != wgpu::QueueWorkDoneStatus::Success) {
                Napi::Error::New(ctx->env, std::string(message)).ThrowAsJavaScriptException();
            }
            ctx->promise.Resolve();
        });

    return promise;
}

void GPUQueue::writeBuffer(Napi::Env env,
                           interop::Interface<interop::GPUBuffer> buffer,
                           interop::GPUSize64 bufferOffset,
                           interop::AllowSharedBufferSource data,
                           interop::GPUSize64 dataOffsetElements,
                           std::optional<interop::GPUSize64> sizeElements) {
    wgpu::Buffer buf = *buffer.As<GPUBuffer>();

    std::span<const uint8_t> dataSpan;
    if (!ConvertDataElementsToSpan(env, &dataSpan, data, dataOffsetElements, sizeElements)) {
        return;
    }

    if (dataSpan.size() % 4 != 0) {
        binding::Errors::OperationError(env, "size is not a multiple of 4 bytes.")
            .ThrowAsJavaScriptException();
        return;
    }

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

void GPUQueue::writeTexture(Napi::Env env,
                            interop::GPUTexelCopyTextureInfo destination,
                            interop::AllowSharedBufferSource data,
                            interop::GPUTexelCopyBufferLayout dataLayout,
                            interop::GPUExtent3D size) {
    wgpu::TexelCopyTextureInfo dst{};
    Converter::BufferSource src{};
    wgpu::TexelCopyBufferLayout 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 env,
                                          interop::GPUCopyExternalImageSourceInfo source,
                                          interop::GPUCopyExternalImageDestInfo destination,
                                          interop::GPUExtent3D copySize) {
    UNIMPLEMENTED(env);
}

std::string GPUQueue::getLabel(Napi::Env) {
    return label_;
}

void GPUQueue::setLabel(Napi::Env, std::string value) {
    queue_.SetLabel(value.c_str());
    label_ = value;
}

}  // namespace wgpu::binding