#pragma once

#include "../defines.hpp"
#include <stack>
#include <vector>
#include "../SharedDefs.hpp"
#include "MiscFunctions.hpp"
#include "WLClasses.hpp"
#include <array>
#include "AnimatedVariable.hpp"
#include "CMType.hpp"

#include <xf86drmMode.h>
#include "MonitorZoomController.hpp"
#include "../render/Texture.hpp"
#include "../render/Framebuffer.hpp"
#include "MonitorResources.hpp"
#include "time/Timer.hpp"
#include "math/Math.hpp"
#include "../desktop/reserved/ReservedArea.hpp"
#include <optional>
#include "cm/ColorManagement.hpp"
#include "signal/Signal.hpp"
#include "DamageRing.hpp"
#include <aquamarine/output/Output.hpp>
#include <aquamarine/allocator/Swapchain.hpp>
#include <hyprutils/os/FileDescriptor.hpp>
#include <sys/types.h>

#include "../helpers/TransferFunction.hpp"
#include "../config/shared/monitor/MonitorRule.hpp"

class CMonitorFrameScheduler;
namespace Monitor {
    class CMonitorResources;
}

// Enum for the different types of auto directions, e.g. auto-left, auto-up.
enum eAutoDirs : uint8_t {
    DIR_AUTO_NONE = 0, /* None will be treated as right. */
    DIR_AUTO_UP,
    DIR_AUTO_DOWN,
    DIR_AUTO_LEFT,
    DIR_AUTO_RIGHT,
    DIR_AUTO_CENTER_UP,
    DIR_AUTO_CENTER_DOWN,
    DIR_AUTO_CENTER_LEFT,
    DIR_AUTO_CENTER_RIGHT
};

struct SMonitorRule {
    eAutoDirs              autoDir       = DIR_AUTO_NONE;
    std::string            name          = "";
    Vector2D               resolution    = Vector2D(1280, 720);
    Vector2D               offset        = Vector2D(0, 0);
    float                  scale         = 1;
    float                  refreshRate   = 60; // Hz
    bool                   disabled      = false;
    wl_output_transform    transform     = WL_OUTPUT_TRANSFORM_NORMAL;
    std::string            mirrorOf      = "";
    bool                   enable10bit   = false;
    NCMType::eCMType       cmType        = NCMType::CM_SRGB;
    NTransferFunction::eTF sdrEotf       = NTransferFunction::TF_DEFAULT;
    float                  sdrSaturation = 1.0f; // SDR -> HDR
    float                  sdrBrightness = 1.0f; // SDR -> HDR
    Desktop::CReservedArea reservedArea;
    std::string            iccFile;

    int                    supportsWideColor = 0;    // 0 - auto, 1 - force enable, -1 - force disable
    int                    supportsHDR       = 0;    // 0 - auto, 1 - force enable, -1 - force disable
    float                  sdrMinLuminance   = 0.2f; // SDR -> HDR
    int                    sdrMaxLuminance   = 80;   // SDR -> HDR

    // Incorrect values will result in reduced luminance range or incorrect tonemapping. Shouldn't damage the HW. Use with care in case of a faulty monitor firmware.
    float              minLuminance    = -1.0f; // >= 0 overrides EDID
    int                maxLuminance    = -1;    // >= 0 overrides EDID
    int                maxAvgLuminance = -1;    // >= 0 overrides EDID

    drmModeModeInfo    drmMode = {};
    std::optional<int> vrr;
};

class CMonitor;
class CSyncTimeline;
class CEventLoopTimer;

class CMonitorState {
  public:
    CMonitorState(CMonitor* owner);
    ~CMonitorState() = default;

    bool commit();
    bool test();
    bool updateSwapchain();
    void applyModeWithSwapchain(const SP<Aquamarine::SOutputMode>& mode);
    void applyCustomModeWithSwapchain(const SP<Aquamarine::SOutputMode>& mode);

  private:
    void      ensureBufferPresent();

    CMonitor* m_owner = nullptr;
};

class CMonitor {
  public:
    CMonitor(SP<Aquamarine::IOutput> output);
    ~CMonitor();

    Vector2D                    m_position         = Vector2D(-1, -1); // means unset
    Vector2D                    m_xwaylandPosition = Vector2D(-1, -1); // means unset
    Config::eAutoDirs           m_autoDir          = Config::DIR_AUTO_NONE;
    Vector2D                    m_size             = Vector2D(0, 0);
    Vector2D                    m_pixelSize        = Vector2D(0, 0);
    Vector2D                    m_transformedSize  = Vector2D(0, 0);

    MONITORID                   m_id                     = MONITOR_INVALID;
    PHLWORKSPACE                m_activeWorkspace        = nullptr;
    PHLWORKSPACE                m_activeSpecialWorkspace = nullptr;
    float                       m_setScale               = 1; // scale set by cfg
    float                       m_scale                  = 1; // real scale

    std::string                 m_name             = "";
    std::string                 m_description      = "";
    std::string                 m_shortDescription = "";

    drmModeModeInfo             m_customDrmMode = {};

    Desktop::CReservedArea      m_reservedArea;

    CMonitorState               m_state;
    CDamageRing                 m_damage;

    SP<Aquamarine::IOutput>     m_output;
    float                       m_refreshRate     = 60; // Hz
    int                         m_forceFullFrames = 0;
    bool                        m_scheduledRecalc = false;
    wl_output_transform         m_transform       = WL_OUTPUT_TRANSFORM_NORMAL;
    float                       m_xwaylandScale   = 1.f;

    std::optional<Vector2D>     m_forceSize;
    SP<Aquamarine::SOutputMode> m_currentMode;
    SP<Aquamarine::CSwapchain>  m_cursorSwapchain;
    uint32_t                    m_drmFormat     = DRM_FORMAT_INVALID;
    uint32_t                    m_prevDrmFormat = DRM_FORMAT_INVALID;

    CMonitorZoomController      m_zoomController;

    bool                        m_dpmsStatus       = true;
    bool                        m_vrrActive        = false; // this can be TRUE even if VRR is not active in the case that this display does not support it.
    bool                        m_enabled10bit     = false; // as above, this can be TRUE even if 10 bit failed.
    NCMType::eCMType            m_cmType           = NCMType::CM_SRGB;
    NTransferFunction::eTF      m_sdrEotf          = NTransferFunction::TF_DEFAULT;
    float                       m_sdrSaturation    = 1.0f;
    float                       m_sdrBrightness    = 1.0f;
    float                       m_sdrMinLuminance  = 0.2f;
    int                         m_sdrMaxLuminance  = 80;
    bool                        m_createdByUser    = false;
    bool                        m_isUnsafeFallback = false;

    SP<CEventLoopTimer>         m_dpmsRetryTimer;

    bool                        m_pendingFrame    = false; // if we schedule a frame during rendering, reschedule it after
    bool                        m_renderingActive = false;

    bool                        m_ratsScheduled = false;
    CTimer                      m_lastPresentationTimer;

    bool                        m_isBeingLeased = false;

    Config::CMonitorRule        m_activeMonitorRule;

    SP<Render::ITexture>        m_splash;
    SP<Render::ITexture>        m_background;

    // explicit sync
    Hyprutils::OS::CFileDescriptor m_inFence; // TODO: remove when aq uses CFileDescriptor

    PHLMONITORREF                  m_self;

    UP<CMonitorFrameScheduler>     m_frameScheduler;

    // mirroring
    PHLMONITORREF              m_mirrorOf;
    std::vector<PHLMONITORREF> m_mirrors;

    // ctm
    Mat3x3 m_ctm        = Mat3x3::identity();
    bool   m_ctmUpdated = false;

    // for tearing
    PHLWINDOWREF m_solitaryClient;

    // for direct scanout
    PHLWINDOWREF m_lastScanout;
    bool         m_directScanoutIsActive    = false; // for cleanup logic. m_lastScanout.expired() can become true before the DS cleanup if client crashes/exits while DS is active.
    bool         m_scanoutNeedsCursorUpdate = false;

    // for special fade/blur
    PHLANIMVAR<float> m_specialFade;

    // for dpms off anim
    PHLANIMVAR<float> m_dpmsBlackOpacity;
    bool              m_pendingDpmsAnimation        = false;
    int               m_pendingDpmsAnimationCounter = 0;

    PHLANIMVAR<float> m_cursorZoom;

    // for fading in the wallpaper because it doesn't happen instantly (it's loaded async)
    PHLANIMVAR<float> m_backgroundOpacity;

    // for initial zoom anim
    PHLANIMVAR<float> m_zoomAnimProgress;
    CTimer            m_newMonitorAnimTimer;
    int               m_zoomAnimFrameCounter = 0;

    struct {
        bool canTear         = false;
        bool nextRenderTorn  = false;
        bool activelyTearing = false;

        bool busy                    = false;
        bool frameScheduledWhileBusy = false;
    } m_tearingState;

    struct {
        CSignalT<> commit;
        CSignalT<> destroy;
        CSignalT<> connect;
        CSignalT<> disconnect;
        CSignalT<> dpmsChanged;
        CSignalT<> modeChanged;
        CSignalT<> presented;
    } m_events;

    std::array<std::vector<PHLLSREF>, 4> m_layerSurfaceLayers;

    // keep in sync with HyprCtl
    enum eDSBlockReason : uint16_t {
        DS_OK = 0,

        DS_BLOCK_UNKNOWN   = (1 << 0),
        DS_BLOCK_USER      = (1 << 1),
        DS_BLOCK_WINDOWED  = (1 << 2),
        DS_BLOCK_CONTENT   = (1 << 3),
        DS_BLOCK_MIRROR    = (1 << 4),
        DS_BLOCK_RECORD    = (1 << 5),
        DS_BLOCK_SW        = (1 << 6),
        DS_BLOCK_CANDIDATE = (1 << 7),
        DS_BLOCK_SURFACE   = (1 << 8),
        DS_BLOCK_TRANSFORM = (1 << 9),
        DS_BLOCK_DMA       = (1 << 10),
        DS_BLOCK_FAILED    = (1 << 11),
        DS_BLOCK_CM        = (1 << 12),

        DS_CHECKS_COUNT = 14,
    };

    // keep in sync with HyprCtl
    enum eSolitaryCheck : uint32_t {
        SC_OK = 0,

        SC_UNKNOWN      = (1 << 0),
        SC_NOTIFICATION = (1 << 1),
        SC_LOCK         = (1 << 2),
        SC_WORKSPACE    = (1 << 3),
        SC_WINDOWED     = (1 << 4),
        SC_DND          = (1 << 5),
        SC_SPECIAL      = (1 << 6),
        SC_ALPHA        = (1 << 7),
        SC_OFFSET       = (1 << 8),
        SC_CANDIDATE    = (1 << 9),
        SC_OPAQUE       = (1 << 10),
        SC_TRANSFORM    = (1 << 11),
        SC_OVERLAYS     = (1 << 12),
        SC_FLOAT        = (1 << 13),
        SC_WORKSPACES   = (1 << 14),
        SC_SURFACES     = (1 << 15),
        SC_ERRORBAR     = (1 << 16),

        SC_CHECKS_COUNT = 17,
    };

    // keep in sync with HyprCtl
    enum eTearingCheck : uint8_t {
        TC_OK = 0,

        TC_UNKNOWN   = (1 << 0),
        TC_NOT_TORN  = (1 << 1),
        TC_USER      = (1 << 2),
        TC_ZOOM      = (1 << 3),
        TC_SUPPORT   = (1 << 4),
        TC_CANDIDATE = (1 << 5),
        TC_WINDOW    = (1 << 6),
        TC_HW_CURSOR = (1 << 7),

        TC_CHECKS_COUNT = 8,
    };

    // methods
    void        onConnect(bool noRule);
    void        onDisconnect(bool destroy = false);
    void        applyCMType(NCMType::eCMType cmType, NTransferFunction::eTF cmSdrEotf);
    bool        applyMonitorRule(Config::CMonitorRule&& pMonitorRule, bool force = false);
    void        addDamage(const pixman_region32_t* rg);
    void        addDamage(const CRegion& rg);
    void        addDamage(const CBox& box);
    bool        shouldSkipScheduleFrameOnMouseEvent();
    void        setMirror(const std::string&);
    bool        isMirror();
    bool        matchesStaticSelector(const std::string& selector) const;
    float       getDefaultScale();
    void        changeWorkspace(const PHLWORKSPACE& pWorkspace, bool internal = false, bool noMouseMove = false, bool noFocus = false);
    void        changeWorkspace(const WORKSPACEID& id, bool internal = false, bool noMouseMove = false, bool noFocus = false);
    void        setSpecialWorkspace(const PHLWORKSPACE& pWorkspace);
    void        setSpecialWorkspace(const WORKSPACEID& id);
    void        moveTo(const Vector2D& pos);
    Vector2D    middle();
    WORKSPACEID activeWorkspaceID();
    WORKSPACEID activeSpecialWorkspaceID();
    CBox        logicalBox();
    CBox        logicalBoxMinusReserved();
    void        scheduleDone();
    uint32_t    isSolitaryBlocked(bool full = false);
    void        recheckSolitary();
    uint8_t     isTearingBlocked(bool full = false);
    bool        updateTearing();
    uint16_t    isDSBlocked(bool full = false);
    bool        attemptDirectScanout();
    void        handleDSleave();
    bool        canAttemptDirectScanoutFast() const;
    bool        isMultiGPU();
    void        setCTM(const Mat3x3& ctm);
    void        onCursorMovedOnMonitor();
    void        setDPMS(bool on);
    bool        shouldUseSoftwareCursors();

    //
    const Mat3x3& getTransformMatrix();
    const Mat3x3& getScaleMatrix();

    void          debugLastPresentation(const std::string& message);

    bool          supportsWideColor();
    bool          supportsHDR();
    float         minLuminance(float defaultValue = 0);
    int           maxLuminance(int defaultValue = 80);
    int           maxAvgLuminance(int defaultValue = 80);
    float         maxFALL();
    float         maxCLL();

    bool          wantsWideColor();
    bool          wantsHDR();

    bool          inHDR();
    bool          gammaRampsInUse();

    /// Has an active workspace with a real fullscreen window (includes special workspace)
    bool inFullscreenMode();
    /// Get fullscreen window from active or special workspace
    PHLWINDOW                                                   getFullscreenWindow();
    std::optional<NColorManagement::PImageDescription>          getFSImageDescription();

    NColorManagement::SPCPRimaries                              getMasteringPrimaries();
    NColorManagement::SImageDescription::SPCMasteringLuminances getMasteringLuminances();

    uint32_t                                                    getPreferredReadFormat();

    bool                                                        needsCM();
    /// Can do CM without shader (forDSmode ? check output image description : check workbuffer image description)
    bool                                canNoShaderCM(bool forDSmode = false);
    bool                                doesNoShaderCM();

    bool                                m_enabled             = false;
    bool                                m_renderingInitPassed = false;

    PHLWINDOWREF                        m_previousFSWindow;
    bool                                m_needsHDRupdate = false;

    std::optional<dev_t>                m_cachedAllocatorDRMDev;
    std::optional<dev_t>                m_cachedCompositorDRMDev;
    int                                 m_cachedAllocatorDRMFD  = -1;
    int                                 m_cachedCompositorDRMFD = -1;
    std::optional<bool>                 m_cachedSameGPU;

    NColorManagement::PImageDescription m_imageDescription = NColorManagement::CImageDescription::from(NColorManagement::SImageDescription{});
    bool                                m_noShaderCTM      = false; // sets drm CTM, restore needed

    bool                                m_blurFBDirty        = true;
    bool                                m_blurFBShouldRender = false;

    // For the list lookup

    bool operator==(const CMonitor& rhs) {
        return m_position == rhs.m_position && m_size == rhs.m_size && m_name == rhs.m_name;
    }

    bool                                needsACopyFB();
    bool                                needsUnmodifiedCopy();
    bool                                useFP16();
    NColorManagement::PImageDescription workBufferImageDescription();
    WP<Monitor::CMonitorResources>      resources();

  private:
    void                    updateMatrix();
    Mat3x3                  m_projMatrix;
    Mat3x3                  m_projOutputMatrix;

    void                    setupDefaultWS(const Config::CMonitorRule&);
    WORKSPACEID             findAvailableDefaultWS();
    void                    commitDPMSState(bool state);
    void                    updateVCGTRamps();

    bool                    m_doneScheduled = false;
    bool                    m_vcgtRampsSet  = false;
    std::stack<WORKSPACEID> m_prevWorkSpaces;

    // Resources
    UP<Monitor::CMonitorResources> m_resources;
    // cached should contain one of predefined descriptions for FP16: sRGB primaries with either linear TF by default and in HDR mode or monitor's TF in SDR with render:fp16_sdr_tf = 0
    // avoids lookup for an id when ::from is used
    NColorManagement::PImageDescription m_cachedInternalDescription = NColorManagement::CImageDescription::from(NColorManagement::SImageDescription{});

    struct {
        CHyprSignalListener frame;
        CHyprSignalListener destroy;
        CHyprSignalListener state;
        CHyprSignalListener needsFrame;
        CHyprSignalListener presented;
        CHyprSignalListener commit;
    } m_listeners;

    int   m_supportsWideColor = 0;
    int   m_supportsHDR       = 0;
    float m_minLuminance      = -1.0f;
    int   m_maxLuminance      = -1;
    int   m_maxAvgLuminance   = -1;
};
