// SPDX-FileCopyrightText: 2026 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
// SPDX-License-Identifier: GPL-3.0-only

#pragma once

#include <memory>
#include <optional>

#include "JFJochHelperWindow.h"
#include <QPointF>

class JFJochFollowerImage;
class QImage;

// ADXV-style magnifier: a small window showing a high-zoom close-up of the main image that
// follows the cursor. It displays the frame the main view has already rendered, so it does no
// conversion or colouring of its own and always agrees with the main view on colour map,
// contrast and HDR mode.
class JFJochMagnifierWindow : public JFJochHelperWindow {
    Q_OBJECT

    JFJochFollowerImage *m_image;
    // Where the cursor last was. Hover positions arriving while the window is hidden are remembered
    // rather than dropped, so re-opening shows the region the cursor is over now and not the one it
    // was over when the window was closed.
    std::optional<QPointF> m_last_scene_pos;

public:
    explicit JFJochMagnifierWindow(QWidget *parent = nullptr);

    // Raw counts for the per-pixel labels. This only stores the pointer - the pixels are
    // displayed from the frame the main view rendered, nothing is converted here.
    void imageLoaded(std::shared_ptr<const JFJochReaderImage> image) override;

protected:
    void showEvent(QShowEvent *event) override;

public slots:
    void setFrame(std::shared_ptr<const QImage> frame);
    void centerAt(QPointF scenePos);
};