#pragma once
#include <QWidget>
#include <QImage>
#include <QLabel>
#include <QPushButton>
#include <QComboBox>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QThread>

#include "v4l2worker.h"

class VideoWidget : public QWidget
{
    Q_OBJECT

public:
    explicit VideoWidget(QWidget *parent = nullptr);
    ~VideoWidget();

public:
    void shutdown();   // safe to call multiple times, called from MainWindow::closeEvent

public slots:
    void onNewFrame(const QImage &frame);
    void clearFrame();   // blanks the preview (used on ANSI clear-screen)

private slots:
    void onStartStop();
    void onFreeze(bool frozen);
    void onScreenshot();
    void refreshDeviceList();

protected:
    void paintEvent(QPaintEvent *event) override;
    void resizeEvent(QResizeEvent *event) override;

private:
    void setupUi();
    void startCapture();
    void stopCapture();
    void updateScaled();

    QThread     *m_thread = nullptr;
    V4l2Worker  *m_worker = nullptr;

    QImage  m_frame;
    QImage  m_scaled;
    bool    m_frozen       = false;
    bool    m_running      = false;
    bool    m_shutdownDone = false;

    QComboBox   *m_deviceCombo   = nullptr;
    QPushButton *m_startBtn      = nullptr;
    QPushButton *m_freezeBtn     = nullptr;
    QPushButton *m_screenshotBtn = nullptr;
    QLabel      *m_infoLabel     = nullptr;
};