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

#include <algorithm>
#include <utility>

#include "src/utils/assert.h"
#include "src/utils/compiler.h"

CachingInterfaceMock::CachingInterfaceMock() {
    ON_CALL(*this, FindKey).WillByDefault([this](auto&&... args) {
        return FindKeyDefault(args...);
    });
    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::FindKeyDefault(std::span<const std::byte> key) {
    std::scoped_lock lock(mMutex);
    if (!mEnabled) {
        return 0;
    }

    std::vector<std::byte> keyVec(key.begin(), key.end());
    auto entry = mCache.find(keyVec);
    if (entry == mCache.end()) {
        return 0;
    }
    return entry->second.size();
}

size_t CachingInterfaceMock::LoadDataDefault(std::span<const std::byte> key,
                                             std::span<std::byte> dest) {
    std::scoped_lock lock(mMutex);
    if (!mEnabled) {
        return 0;
    }

    std::vector<std::byte> keyVec(key.begin(), key.end());
    auto entry = mCache.find(keyVec);
    if (entry == mCache.end()) {
        return 0;
    }
    DAWN_CHECK(dest.size() >= entry->second.size());
    std::ranges::copy(entry->second, dest.begin());
    mHitCount++;
    return entry->second.size();
}

void CachingInterfaceMock::StoreDataDefault(std::span<const std::byte> key,
                                            std::span<const std::byte> src) {
    std::scoped_lock lock(mMutex);
    if (!mEnabled) {
        return;
    }

    std::vector<std::byte> keyVec(key.begin(), key.end());
    std::vector<std::byte> entry(src.begin(), src.end());
    mCache.insert_or_assign(std::move(keyVec), std::move(entry));
}

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

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