// Copyright 2022 The Dawn & Tint Authors
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#include "src/dawn/tests/mocks/platform/CachingInterfaceMock.h"

#include "src/utils/compiler.h"

CachingInterfaceMock::CachingInterfaceMock() {
    ON_CALL(*this, LoadData).WillByDefault([this](auto&&... args) {
        return LoadDataDefault(args...);
    });
    ON_CALL(*this, StoreData).WillByDefault([this](auto&&... args) {
        return StoreDataDefault(args...);
    });
}

void CachingInterfaceMock::Enable() {
    std::scoped_lock lock(mMutex);
    mEnabled = true;
}

void CachingInterfaceMock::Disable() {
    std::scoped_lock lock(mMutex);
    mEnabled = false;
}

size_t CachingInterfaceMock::GetHitCount() const {
    std::scoped_lock lock(mMutex);
    return mHitCount;
}

size_t CachingInterfaceMock::GetNumEntries() const {
    std::scoped_lock lock(mMutex);
    return mCache.size();
}

size_t CachingInterfaceMock::LoadDataDefault(const void* key,
                                             size_t keySize,
                                             void* value,
                                             size_t valueSize) {
    std::scoped_lock lock(mMutex);
    if (!mEnabled) {
        return 0;
    }

    const std::string keyStr(reinterpret_cast<const char*>(key), keySize);
    auto entry = mCache.find(keyStr);
    if (entry == mCache.end()) {
        return 0;
    }
    if (valueSize >= entry->second.size()) {
        // Only consider a cache-hit on the memcpy, since peeks are implementation detail.
        DAWN_UNSAFE_TODO(memcpy(value, entry->second.data(), entry->second.size()));
        mHitCount++;
    }
    return entry->second.size();
}

void CachingInterfaceMock::StoreDataDefault(const void* key,
                                            size_t keySize,
                                            const void* value,
                                            size_t valueSize) {
    std::scoped_lock lock(mMutex);
    if (!mEnabled) {
        return;
    }

    const std::string keyStr(reinterpret_cast<const char*>(key), keySize);
    const uint8_t* it = reinterpret_cast<const uint8_t*>(value);
    std::vector<uint8_t> entry(it, DAWN_UNSAFE_TODO(it + valueSize));
    mCache.insert_or_assign(keyStr, entry);
}

DawnCachingMockPlatform::DawnCachingMockPlatform(dawn::platform::CachingInterface* cachingInterface)
    : mCachingInterface(cachingInterface) {}

dawn::platform::CachingInterface* DawnCachingMockPlatform::GetCachingInterface() {
    return mCachingInterface;
}
