/**
 * @file PlotGrid.h
 * @brief Resizable grid of PlotWidgets realising the selected PlotLayout.
 *
 * Built from nested QSplitters (rows of columns) so cells are user-resizable,
 * mirroring the ImGui draggable separators. Holds up to kMaxPlotSlots plots,
 * fans out the 60 Hz tick / model / pause notifications, and drives the
 * history navigation (live ⇄ stored-X) for all visible plots.
 */

#pragma once

#include "Model.h"

#include <QWidget>
#include <vector>

namespace shq {

class Hub;
struct GlobalView;
class PlotWidget;

class PlotGrid : public QWidget {
    Q_OBJECT
public:
    PlotGrid(Hub* hub, GlobalView* gv, QWidget* parent = nullptr);

    void setLayout(PlotLayout l);
    PlotLayout layout() const { return layout_; }
    int numSlots() const { return layoutSlots(layout_); }

    /** Visible plots (size == numSlots()). */
    const std::vector<PlotWidget*>& plots() const { return plots_; }

public Q_SLOTS:
    void onModelChanged();
    void onPauseChanged();
    void tick();

    /** History navigation helpers (operate on all visible plots). */
    void goLive();
    void setAllStoredX(double t0, double t1);
    void panAll(double frac);            /* +right / -left, frac of span */
    void jumpAllAgo(double secAgo);      /* set window ending secAgo before now */
    bool anyNonLive() const;
    /** Current stored range of the first non-live plot (false if all live). */
    bool currentRange(double& t0, double& t1) const;

private:
    void rebuild();

    Hub*        hub_;
    GlobalView* gv_;
    PlotLayout  layout_ = PlotLayout::k1x1;

    std::vector<PlotWidget*> plots_;     /* currently mounted (== numSlots) */
    std::vector<PlotWidget*> pool_;      /* all kMaxPlotSlots, persistent */
};

} /* namespace shq */