/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 2015 Martin Gräßlin <mgraesslin@kde.org>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#ifndef KWIN_DRM_OUTPUT_H
#define KWIN_DRM_OUTPUT_H

#include "abstract_wayland_output.h"
#include "drm_pointer.h"
#include "drm_object.h"
#include "drm_object_plane.h"
#include "edid.h"

#include <QObject>
#include <QPoint>
#include <QSize>
#include <QVector>
#include <xf86drmMode.h>

namespace KWin
{

class DrmBackend;
class DrmBuffer;
class DrmDumbBuffer;
class DrmPlane;
class DrmConnector;
class DrmCrtc;
class Cursor;

class KWIN_EXPORT DrmOutput : public AbstractWaylandOutput
{
    Q_OBJECT
public:
    ///deletes the output, calling this whilst a page flip is pending will result in an error
    ~DrmOutput() override;
    ///queues deleting the output after a page flip has completed.
    void teardown();
    void releaseGbm();
    bool showCursor(DrmDumbBuffer *buffer);
    bool showCursor();
    bool hideCursor();
    void updateCursor();
    void moveCursor(Cursor* cursor, const QPoint &globalPos);
    bool init(drmModeConnector *connector);
    bool present(DrmBuffer *buffer);
    void pageFlipped();

    // These values are defined by the kernel
    enum class DpmsMode {
        On = DRM_MODE_DPMS_ON,
        Standby = DRM_MODE_DPMS_STANDBY,
        Suspend = DRM_MODE_DPMS_SUSPEND,
        Off = DRM_MODE_DPMS_OFF
    };
    Q_ENUM(DpmsMode);
    bool isDpmsEnabled() const {
        // We care for current as well as pending mode in order to allow first present in AMS.
        return m_dpmsModePending == DpmsMode::On;
    }

    DpmsMode dpmsMode() const {
        return m_dpmsMode;
    }
    DpmsMode dpmsModePending() const {
        return m_dpmsModePending;
    }

    const DrmCrtc *crtc() const {
        return m_crtc;
    }
    const DrmConnector *connector() const {
        return m_conn;
    }
    const DrmPlane *primaryPlane() const {
        return m_primaryPlane;
    }

    bool initCursor(const QSize &cursorSize);

    bool supportsTransformations() const;

    /**
     * Drm planes might be capable of realizing the current output transform without usage
     * of compositing. This is a getter to query the current state of that
     *
     * @return true if the hardware realizes the transform without further assistance
     */
    bool hardwareTransforms() const;

    /**
     * The current rotation of the output
     *
     * @return rotation in degree
     */
    int rotation() const;

private:
    friend class DrmBackend;
    friend class DrmCrtc;   // TODO: For use of setModeLegacy. Remove later when we allow multiple connectors per crtc
                            //       and save the connector ids in the DrmCrtc instance.
    DrmOutput(DrmBackend *backend);

    bool presentAtomically(DrmBuffer *buffer);

    enum class AtomicCommitMode {
        Test,
        Real
    };
    bool doAtomicCommit(AtomicCommitMode mode);

    bool presentLegacy(DrmBuffer *buffer);
    bool setModeLegacy(DrmBuffer *buffer);
    void initEdid(drmModeConnector *connector);
    void initDpms(drmModeConnector *connector);
    void initOutputDevice(drmModeConnector *connector);

    bool isCurrentMode(const drmModeModeInfo *mode) const;
    void initUuid();
    bool initPrimaryPlane();
    bool initCursorPlane();

    void atomicEnable();
    void atomicDisable();
    void updateEnablement(bool enable) override;

    bool dpmsAtomicOff();
    bool dpmsLegacyApply();

    void dpmsFinishOn();
    void dpmsFinishOff();

    bool atomicReqModesetPopulate(drmModeAtomicReq *req, bool enable);
    void updateDpms(KWayland::Server::OutputInterface::DpmsMode mode) override;
    void updateMode(int modeIndex) override;
    void setWaylandMode();

    void updateTransform(Transform transform) override;

    int gammaRampSize() const override;
    bool setGammaRamp(const GammaRamp &gamma) override;
    QMatrix4x4 matrixDisplay(const QSize &s) const;

    DrmBackend *m_backend;
    DrmConnector *m_conn = nullptr;
    DrmCrtc *m_crtc = nullptr;
    bool m_lastGbm = false;
    drmModeModeInfo m_mode;
    Edid m_edid;
    DrmScopedPointer<drmModePropertyRes> m_dpms;
    DpmsMode m_dpmsMode = DpmsMode::On;
    DpmsMode m_dpmsModePending = DpmsMode::On;
    QByteArray m_uuid;

    uint32_t m_blobId = 0;
    DrmPlane* m_primaryPlane = nullptr;
    DrmPlane* m_cursorPlane = nullptr;
    QVector<DrmPlane*> m_nextPlanesFlipList;
    bool m_pageFlipPending = false;
    bool m_atomicOffPending = false;
    bool m_modesetRequested = true;

    struct {
        Transform transform;
        drmModeModeInfo mode;
        DrmPlane::Transformations planeTransformations;
        QPoint globalPos;
        bool valid = false;
    } m_lastWorkingState;
    DrmDumbBuffer *m_cursor[2] = {nullptr, nullptr};
    int m_cursorIndex = 0;
    bool m_hasNewCursor = false;
    bool m_deleted = false;
};

}

Q_DECLARE_METATYPE(KWin::DrmOutput*)

QDebug& operator<<(QDebug& stream, const KWin::DrmOutput *);

#endif