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

#pragma once

#include <QWidget>
#include <QMap>
#include <memory>

#include "../../reader/JFJochReaderDataset.h"

class QComboBox;
class QCheckBox;
class QHBoxLayout;
class QToolButton;
class QScrollArea;
class QResizeEvent;

// A strip of thumbnails for a handful of representative images (evenly spaced, most spots, or
// indexed), optionally overlaid with spots so a real pattern reads like a constellation. Clicking
// a thumbnail opens that image. Thumbnails are rendered off-thread by the reading worker.
class JFJochViewerImageStrip : public QWidget {
    Q_OBJECT
public:
    explicit JFJochViewerImageStrip(QWidget *parent = nullptr);

public slots:
    void datasetLoaded(std::shared_ptr<const JFJochReaderDataset> dataset);
    void thumbnailReady(qint64 image_number, QImage thumb);
    void resetForNewFile();   // a new file/stream opened: rebuild once, then stay put on live updates

signals:
    void requestThumbnails(QVector<qint64> image_numbers, bool show_spots);
    void imageSelected(int64_t image_number, int64_t summation);

protected:
    void resizeEvent(QResizeEvent *event) override;

private:
    std::shared_ptr<const JFJochReaderDataset> dataset_;
    QComboBox *mode_ = nullptr;
    QCheckBox *spots_ = nullptr;
    QScrollArea *scroll_ = nullptr;
    QHBoxLayout *strip_ = nullptr;
    QMap<qint64, QToolButton *> slots_;   // image number -> its thumbnail button

    QVector<qint64> ComputeRepresentatives() const;
    void Rebuild();
    void UpdateThumbnailSize();   // scale thumbnails to the available dock height
};