/*
 * Copyright (C) 2014-2025 Amlogic, Inc. All rights reserved.
 *
 * All information contained herein is Amlogic confidential.
 *
 * This software is provided to you pursuant to Software License Agreement
 * (SLA) with Amlogic Inc ("Amlogic"). This software may be used
 * only in accordance with the terms of this agreement.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification is strictly prohibited without prior written permission from
 * Amlogic.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once
#include <condition_variable>
#include <list>
#include <mutex>
#include <chrono>

template <typename T>
class BlockChannel {
public:
    BlockChannel(int maxSize = 1) : mMaxSize(maxSize) {}
    ~BlockChannel() {
        std::lock_guard<std::mutex> lk(mMutex);
        mList.clear();
    }

    void put(T item) {
        std::unique_lock<std::mutex> lk(mMutex);

        mCond.wait(lk, [this]() { return mList.size() < mMaxSize; });

        mList.emplace_back(std::move(item));
        mCond.notify_all();
    }

    T poll() {
        std::unique_lock<std::mutex> lk(mMutex);

        mCond.wait(lk, [this]() { return !mList.empty(); });

        T item = std::move(mList.front());
        mList.pop_front();
        mCond.notify_all();
        return item;
    }

    bool poll(T &out, int timeout_ms) {
        std::unique_lock<std::mutex> lk(mMutex);

        if (!mCond.wait_for(lk, std::chrono::milliseconds(timeout_ms), [this]() { return !mList.empty(); })) {
            return false;
        }

        out = std::move(mList.front());
        mList.pop_front();
        mCond.notify_all();
        return true;
    }

private:
    int mMaxSize;
    std::list<T> mList;
    std::mutex mMutex;
    std::condition_variable mCond;
};