/*
    SPDX-FileCopyrightText: 2020 Vlad Zahorodnii <vlad.zahorodnii@kde.org>

    SPDX-License-Identifier: GPL-2.0-or-later
*/

#pragma once

#include "renderbackend.h"
#include "renderjournal.h"
#include "renderloop.h"

#include <QBasicTimer>

#include <fstream>
#include <optional>

namespace KWin
{

class SurfaceItem;
class OutputFrame;

class KWIN_EXPORT RenderLoopPrivate
{
public:
    static RenderLoopPrivate *get(RenderLoop *loop);
    explicit RenderLoopPrivate(RenderLoop *q, BackendOutput *output);

    void dispatch();

    void delayScheduleRepaint();
    void scheduleNextRepaint();
    void scheduleRepaint(std::chrono::nanoseconds lastTargetTimestamp);

    void notifyFrameDropped();
    void notifyFrameCompleted(std::chrono::nanoseconds timestamp, std::optional<RenderTimeSpan> renderTime, PresentationMode mode, OutputFrame *frame);
    void notifyVblank(std::chrono::nanoseconds timestamp);

    RenderLoop *const q;
    BackendOutput *const output;
    std::optional<std::fstream> m_debugOutput;
    std::chrono::nanoseconds lastPresentationTimestamp = std::chrono::nanoseconds::zero();
    std::chrono::nanoseconds nextPresentationTimestamp = std::chrono::nanoseconds::zero();
    bool wasTripleBuffering = false;
    int doubleBufferingCounter = 0;
    QBasicTimer compositeTimer;
    RenderJournal renderJournal;
    int refreshRate = 60000;
    int pendingFrameCount = 0;
    bool preparingNewFrame = false;
    int inhibitCount = 0;
    bool pendingReschedule = false;
    std::chrono::nanoseconds safetyMargin{0};

    PresentationMode presentationMode = PresentationMode::VSync;
    int maxPendingFrameCount = 1;

    QBasicTimer delayedVrrTimer;
};

} // namespace KWin