/* Desktop publisher: GUI управляет источниками и AudioDevice, workers кодируют видео/Opus.
 * Окно не владеет трансляцией. Stop закрывает callbacks, joins workers и отправляет FIN.
 * Captured video/preview хранят только последний кадр; публикация использует общий C actor. */
#pragma once
#include <QObject>
#include <QTimer>
#include <QVariant>
#include <QImage>
#include <QList>
#include <memory>
#include "live_video_encoder.h"
#include "audio_device.h"
#include "audio_capture_lease.h"
#include "../../../src/stream/stream_publisher.h"

struct StreamVideoSource {
    enum Kind { Camera, Screen, Window };
    Kind kind = Camera;
    QString name;
    QByteArray id;
    QVariant window;
};
struct StreamPublishConfig {
    StreamVideoSource source;
    LiveVideoConfig video;
    QString microphone;
    bool audio = true;
};
class StreamPublishEngine : public QObject {
    Q_OBJECT
public:
    explicit StreamPublishEngine(QObject* parent = nullptr);
    ~StreamPublishEngine() override;
    bool start(uint64_t group, const StreamPublishConfig& config);
    bool reconfigure(const StreamPublishConfig& config);
    void stop();
    bool active() const;
    bool running() const;
    uint64_t group() const;
    StreamPublishConfig config() const;
    QList<int> codecs() const;
    static QList<StreamVideoSource> sources();
    static bool supported();
    void setMuted(bool muted);
signals:
    void codecsChanged();
    void stateChanged(const QString& state);
    void configurationChanged();
    void previewVideoChanged(const QVariant& frame);
    void telemetryChanged(const stream_publisher_status& status);
    void errorOccurred(const QString& error);
    void audioChannelsChanged(int channels);
private:
    struct Impl;
    std::unique_ptr<Impl> m;
    AudioDevice m_capture;
    AudioCaptureLease m_microphone{AudioCaptureLease::Mode::Exclusive};
    QTimer m_timer;
    QTimer m_previewTimer;
    bool openSource(const StreamPublishConfig& config);
    void closeSource();
    bool openMicrophone();
    void sourceFailed(uint64_t generation, const QString& error);
    void publicationFailed(uint64_t id, const QString& error);
    void tick();
    void videoLoop();
    void audioLoop();
    void captureAudio(const void* pcm, unsigned frames);
};