// Copyright 2026 The Dawn & Tint Authors
//
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#include "src/dawn/wire/InlineSharedMemoryManager.h"

#include <memory>
#include <utility>

#include "src/dawn/common/Ref.h"
#include "src/utils/platform.h"

namespace dawn::wire {

SharedMemory::SharedMemory(SystemHandle handle, Span<std::byte> data, uint64_t allocatedSize)
    : mHandle(std::move(handle)), mData(data), mAllocatedSize(allocatedSize) {}

SharedMemory::~SharedMemory() {}

InlineSharedMemoryManager::InlineSharedMemoryManager() = default;
InlineSharedMemoryManager::~InlineSharedMemoryManager() = default;

Ref<SharedMemory> InlineSharedMemoryManager::CreateSharedMemory(size_t) {
    return nullptr;
}

SharedMemoryID InlineSharedMemoryManager::PutOnWireAndGetID(SharedMemory* memory) {
    return mAllSharedMemoryOnWire.Use([&](auto allSharedMemoryOnWire) {
        SharedMemoryID id = allSharedMemoryOnWire->nextId++;
        allSharedMemoryOnWire->idToSharedMemory.emplace(id, memory);
        return id;
    });
}

Ref<SharedMemory> InlineSharedMemoryManager::AcquireFromWire(SharedMemoryID id) {
    return mAllSharedMemoryOnWire.Use([&](auto allSharedMemoryOnWire) {
        auto it = allSharedMemoryOnWire->idToSharedMemory.find(id);
        if (it == allSharedMemoryOnWire->idToSharedMemory.end()) {
            return Ref<SharedMemory>();
        }
        Ref<SharedMemory> memory = std::move(it->second);
        allSharedMemoryOnWire->idToSharedMemory.erase(it);
        return memory;
    });
}

#if !DAWN_PLATFORM_IS(WINDOWS)
std::shared_ptr<InlineSharedMemoryManager> CreateInlineSharedMemoryManager() {
    return std::make_shared<InlineSharedMemoryManager>();
}
#endif  // !DAWN_PLATFORM_IS(WINDOWS)

}  // namespace dawn::wire