/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "src/gpu/vk/GrVkMemoryReclaimer.h"

#include "include/core/SkLog.h"

#define VK_CALL(GPU, X) GR_VK_CALL((GPU)->vkInterface(), X)

SkExecutor& GrVkMemoryReclaimer::getThreadPool()
{
    static std::unique_ptr<SkExecutor> executor = ({
        auto executor = SkExecutor::MakeFIFOThreadPool(1, false);
        executor->add([]() {
            int err = pthread_setname_np(pthread_self(), "async-reclaimer");
            if (err) {
                SK_LOGE("GrVkMemoryReclaimer::GetThreadPool pthread_setname_np, error = %d", err);
            }
        });
        std::move(executor);
    });
    return *executor;
}

bool GrVkMemoryReclaimer::addMemoryToWaitQueue(const GrVkGpu* gpu, const GrVkAlloc& alloc, const VkBuffer& buffer)
{
    if (!fEnabled) {
        return false;
    }
    fWaitQueues.emplace_back(WaitQueueItem{.fGpu = gpu, .fAlloc = alloc, .fType = ItemType::BUFFER, .fBuffer = buffer});
    if (fWaitQueues.size() > fMemoryCountThreshold) {
        invokeParallelReclaiming();
    }
    return true;
}

bool GrVkMemoryReclaimer::addMemoryToWaitQueue(const GrVkGpu* gpu, const GrVkAlloc& alloc, const VkImage& image)
{
    if (!fEnabled) {
        return false;
    }
    fWaitQueues.emplace_back(WaitQueueItem{.fGpu = gpu, .fAlloc = alloc, .fType = ItemType::IMAGE, .fImage = image});
    if (fWaitQueues.size() > fMemoryCountThreshold) {
        invokeParallelReclaiming();
    }
    return true;
}

void GrVkMemoryReclaimer::flushGpuMemoryInWaitQueue()
{
    if (!fEnabled) {
        return;
    }
    if (!fWaitQueues.size()) {
        return;
    }
    invokeParallelReclaiming();
}

void GrVkMemoryReclaimer::invokeParallelReclaiming()
{
    getThreadPool().add([freeQueues {std::move(fWaitQueues)}] {
        for (auto& item : freeQueues) {
            if (item.fType == ItemType::BUFFER) {
                GrVkBuffer::DestroyAndFreeBufferMemory(item.fGpu, item.fAlloc, item.fBuffer);
            } else {
                GrVkImage::DestroyAndFreeImageMemory(item.fGpu, item.fAlloc, item.fImage);
            }
        }
    });
}

void GrVkMemoryReclaimer::setGpuMemoryAsyncReclaimerSwitch(bool enabled)
{
    fEnabled = enabled;
}