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#include "dawn/native/webgpu/ComputePipelineWGPU.h"

#include <string>
#include <vector>
#include "dawn/common/StringViewUtils.h"
#include "dawn/native/webgpu/DeviceWGPU.h"
#include "dawn/native/webgpu/PipelineLayoutWGPU.h"
#include "dawn/native/webgpu/ShaderModuleWGPU.h"
#include "dawn/native/webgpu/ToWGPU.h"

namespace dawn::native::webgpu {

// static
Ref<ComputePipeline> ComputePipeline::CreateUninitialized(
    Device* device,
    const UnpackedPtr<ComputePipelineDescriptor>& descriptor) {
    return AcquireRef(new ComputePipeline(device, descriptor));
}

ComputePipeline::ComputePipeline(Device* device,
                                 const UnpackedPtr<ComputePipelineDescriptor>& descriptor)
    : ComputePipelineBase(device, descriptor), ObjectWGPU(device->wgpu.computePipelineRelease) {}

MaybeError ComputePipeline::InitializeImpl() {
    WGPUComputePipelineDescriptor desc;
    desc.nextInChain = nullptr;
    desc.label = ToOutputStringView(GetLabel());
    const PipelineLayoutBase* layout = GetLayout();
    if (layout != nullptr) {
        desc.layout = ToBackend(layout)->GetInnerHandle();
    } else {
        desc.layout = nullptr;
    }

    const ProgrammableStage& stage = GetStage(SingleShaderStage::Compute);
    desc.compute.nextInChain = nullptr;
    desc.compute.module = ToBackend(stage.module.Get())->GetInnerHandle();
    desc.compute.entryPoint = ToOutputStringView(stage.entryPoint);

    std::vector<WGPUConstantEntry> constants;
    std::vector<std::string> keys;
    PopulateWGPUConstants(&constants, &keys, stage.constants);
    desc.compute.constants = constants.data();
    desc.compute.constantCount = constants.size();

    auto device = ToBackend(GetDevice());
    mInnerHandle = device->wgpu.deviceCreateComputePipeline(device->GetInnerHandle(), &desc);
    DAWN_ASSERT(mInnerHandle);
    return {};
}

}  // namespace dawn::native::webgpu