#ifndef FFMPEGVIDEOPULLER_H
#define FFMPEGVIDEOPULLER_H

#pragma once

extern "C" {
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
}

#include <QObject>
#include <QString>
#include <QThread>

#include <atomic>
#include <functional>

#include "RingBuffer.h"

class FFmpegVideoPuller : public QObject
{
    Q_OBJECT
public:
    explicit FFmpegVideoPuller(QObject* parent = nullptr);
    ~FFmpegVideoPuller();

    bool open(const QString& url,
              int videoBufferSec = 300,
              int audioBufferSec = 300); // 默认缓存5分钟
    void setSpeed(float speed);          // 设置倍速
    float getSpeed() const;
    void start();
    void stop();

    // 进度相关
    double getFirstPts() const;
    double getLastPts() const;
    double getCurrentPts() const;
    void seekToPts(double pts); // 跳转到指定pts

    // 取帧接口
    AVFrame* getCurrentVideoFrame();
    AVFrame* getCurrentAudioFrame();

    // 播放指针前进
    void nextVideoFrame();
    void nextAudioFrame();

    // 缓冲区大小
    size_t videoBufferSize() const;
    size_t audioBufferSize() const;

    void setVideoRenderCallback(std::function<void(AVFrame*)> cb) { m_videoRenderCallback = cb; }
    void setAudioPlayCallback(std::function<void(AVFrame*)> cb) { m_audioPlayCallback = cb; }

    double getTotalDuration() const { return m_totalDuration; }

private:
    void decodeLoop();
    void videoPlayLoop();
    void audioPlayLoop();
    
    // 音视频同步
    std::atomic<double> m_audioPts{0.0};
    std::atomic<double> m_videoPts{0.0};
    std::mutex m_syncMutex;

    QString m_url;
    std::atomic<bool> m_running{false};
    mutable std::mutex m_speedMutex;
    float m_speed = 1.0f;

    // FFmpeg相关
    AVFormatContext* m_fmtCtx = nullptr;
    AVCodecContext* m_videoCodecCtx = nullptr;
    AVCodecContext* m_audioCodecCtx = nullptr;
    int m_videoStreamIdx = -1;
    int m_audioStreamIdx = -1;

    // 缓冲区
    RingBuffer<AVFrame*>* m_videoBuffer = nullptr;
    RingBuffer<AVFrame*>* m_audioBuffer = nullptr;

    // 线程
    QThread* m_decodeThread = nullptr;
    QThread* m_videoPlayThread = nullptr;
    QThread* m_audioPlayThread = nullptr;

    // 播放指针
    std::atomic<size_t> m_videoPlayIndex{0};
    std::atomic<size_t> m_audioPlayIndex{0};
    std::atomic<double> m_currentPts{0.0};

    mutable std::mutex m_ptsMutex;

    std::function<void(AVFrame*)> m_videoRenderCallback;
    std::function<void(AVFrame*)> m_audioPlayCallback;

    double m_totalDuration = -1.0;
};

#endif // FFMPEGVIDEOPULLER_H