// Copyright 2025 The Dawn & Tint Authors
//
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#include "dawn/native/webgpu/BindGroupWGPU.h"

#include "absl/container/inlined_vector.h"
#include "dawn/common/StringViewUtils.h"
#include "dawn/native/webgpu/BindGroupLayoutWGPU.h"
#include "dawn/native/webgpu/BufferWGPU.h"
#include "dawn/native/webgpu/DeviceWGPU.h"
#include "dawn/native/webgpu/TextureWGPU.h"

namespace dawn::native::webgpu {

namespace {

WGPUBindGroupEntry ToWGPU(const BindGroupEntry* entry) {
    return {
        .nextInChain = nullptr,
        .binding = entry->binding,
        .buffer = entry->buffer == nullptr ? nullptr : ToBackend(entry->buffer)->GetInnerHandle(),
        .offset = entry->offset,
        .size = entry->size,
        // TODO(crbug.com/413053623): replace with the following when the object implementation is
        // done.
        .sampler = nullptr,
        .textureView = entry->textureView == nullptr
                           ? nullptr
                           : ToBackend(entry->textureView)->GetInnerHandle(),
    };
}

class ComboBindGroupDescriptor {
  public:
    explicit ComboBindGroupDescriptor(const BindGroupDescriptor* desc) {
        mDesc.nextInChain = nullptr;
        mDesc.label = ToOutputStringView(desc->label);
        mDesc.layout = ToBackend(desc->layout->GetInternalBindGroupLayout())->GetInnerHandle();
        mDesc.entryCount = desc->entryCount;
        for (uint32_t i = 0; i < desc->entryCount; ++i) {
            mEntries.push_back(ToWGPU(&desc->entries[i]));
        }
        mDesc.entries = mEntries.data();
    }

    const WGPUBindGroupDescriptor* Get() const { return &mDesc; }

  private:
    WGPUBindGroupDescriptor mDesc;
    absl::InlinedVector<WGPUBindGroupEntry, 8> mEntries;
};

}  // namespace

// static
ResultOrError<Ref<BindGroup>> BindGroup::Create(
    Device* device,
    const UnpackedPtr<BindGroupDescriptor>& descriptor) {
    Ref<BindGroup> bindGroup =
        ToBackend(descriptor->layout->GetInternalBindGroupLayout())->AllocateBindGroup(descriptor);
    DAWN_TRY(bindGroup->Initialize(descriptor));
    return bindGroup;
}

BindGroup::BindGroup(Device* device, const UnpackedPtr<BindGroupDescriptor>& descriptor)
    : BindGroupBase(this, device, descriptor), ObjectWGPU(device->wgpu.bindGroupRelease) {
    ComboBindGroupDescriptor desc(*descriptor);
    mInnerHandle =
        ToBackend(GetDevice())
            ->wgpu.deviceCreateBindGroup(ToBackend(GetDevice())->GetInnerHandle(), desc.Get());
    DAWN_ASSERT(mInnerHandle);
}

MaybeError BindGroup::InitializeImpl() {
    return {};
}

void BindGroup::DeleteThis() {
    // This function must first run the destructor and then deallocate memory. Take a reference to
    // the BindGroupLayout+SlabAllocator before running the destructor so this function can access
    // it afterwards and it's not destroyed prematurely.
    Ref<BindGroupLayout> layout = ToBackend(GetLayout());
    BindGroupBase::DeleteThis();
    layout->DeallocateBindGroup(this);
}

}  // namespace dawn::native::webgpu