#ifndef QWKWINDOWSEXTRA_P_H
#define QWKWINDOWSEXTRA_P_H

//
//  W A R N I N G !!!
//  -----------------
//
// This file is not part of the QWindowKit API. It is used purely as an
// implementation detail. This header file may change from version to
// version without notice, or may even be removed.
//

#include <shellscalingapi.h>
#include <dwmapi.h>
#include <timeapi.h>

#include <QWKCore/qwindowkit_windows.h>

#include <QtGui/QStyleHints>
#include <QtGui/QPalette>

#include <QtCore/private/qsystemlibrary_p.h>
#include <QtCore/private/qwinregistry_p.h>

// Don't include this header in any header files.

namespace QWK {

    enum _DWMWINDOWATTRIBUTE {
        // [set] BOOL, Allows the use of host backdrop brushes for the window.
        _DWMWA_USE_HOSTBACKDROPBRUSH = 17,

        // Undocumented, the same with DWMWA_USE_IMMERSIVE_DARK_MODE, but available on systems
        // before Win10 20H1.
        _DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1 = 19,

        // [set] BOOL, Allows a window to either use the accent color, or dark, according to the
        // user Color Mode preferences.
        _DWMWA_USE_IMMERSIVE_DARK_MODE = 20,

        // [set] WINDOW_CORNER_PREFERENCE, Controls the policy that rounds top-level window corners
        _DWMWA_WINDOW_CORNER_PREFERENCE = 33,

        // [get] UINT, width of the visible border around a thick frame window
        _DWMWA_VISIBLE_FRAME_BORDER_THICKNESS = 37,

        // [get, set] SYSTEMBACKDROP_TYPE, Controls the system-drawn backdrop material of a window,
        // including behind the non-client area.
        _DWMWA_SYSTEMBACKDROP_TYPE = 38,

        // Undocumented, use this value to enable Mica material on Win11 21H2. You should use
        // DWMWA_SYSTEMBACKDROP_TYPE instead on Win11 22H2 and newer.
        _DWMWA_MICA_EFFECT = 1029
    };

    // Types used with DWMWA_SYSTEMBACKDROP_TYPE
    enum _DWM_SYSTEMBACKDROP_TYPE {
        _DWMSBT_AUTO, // [Default] Let DWM automatically decide the system-drawn backdrop for this
                      // window.
        _DWMSBT_NONE, // [Disable] Do not draw any system backdrop.
        _DWMSBT_MAINWINDOW,      // [Mica] Draw the backdrop material effect corresponding to a
                                 // long-lived window.
        _DWMSBT_TRANSIENTWINDOW, // [Acrylic] Draw the backdrop material effect corresponding to a
                                 // transient window.
        _DWMSBT_TABBEDWINDOW,    // [Mica Alt] Draw the backdrop material effect corresponding to a
                                 // window with a tabbed title bar.
    };

    enum WINDOWCOMPOSITIONATTRIB {
        WCA_UNDEFINED = 0,
        WCA_NCRENDERING_ENABLED = 1,
        WCA_NCRENDERING_POLICY = 2,
        WCA_TRANSITIONS_FORCEDISABLED = 3,
        WCA_ALLOW_NCPAINT = 4,
        WCA_CAPTION_BUTTON_BOUNDS = 5,
        WCA_NONCLIENT_RTL_LAYOUT = 6,
        WCA_FORCE_ICONIC_REPRESENTATION = 7,
        WCA_EXTENDED_FRAME_BOUNDS = 8,
        WCA_HAS_ICONIC_BITMAP = 9,
        WCA_THEME_ATTRIBUTES = 10,
        WCA_NCRENDERING_EXILED = 11,
        WCA_NCADORNMENTINFO = 12,
        WCA_EXCLUDED_FROM_LIVEPREVIEW = 13,
        WCA_VIDEO_OVERLAY_ACTIVE = 14,
        WCA_FORCE_ACTIVEWINDOW_APPEARANCE = 15,
        WCA_DISALLOW_PEEK = 16,
        WCA_CLOAK = 17,
        WCA_CLOAKED = 18,
        WCA_ACCENT_POLICY = 19,
        WCA_FREEZE_REPRESENTATION = 20,
        WCA_EVER_UNCLOAKED = 21,
        WCA_VISUAL_OWNER = 22,
        WCA_HOLOGRAPHIC = 23,
        WCA_EXCLUDED_FROM_DDA = 24,
        WCA_PASSIVEUPDATEMODE = 25,
        WCA_USEDARKMODECOLORS = 26,
        WCA_CORNER_STYLE = 27,
        WCA_PART_COLOR = 28,
        WCA_DISABLE_MOVESIZE_FEEDBACK = 29,
        WCA_LAST = 30
    };

    enum ACCENT_STATE {
        ACCENT_DISABLED = 0,
        ACCENT_ENABLE_GRADIENT = 1,
        ACCENT_ENABLE_TRANSPARENTGRADIENT = 2,
        ACCENT_ENABLE_BLURBEHIND = 3,        // Traditional DWM blur
        ACCENT_ENABLE_ACRYLICBLURBEHIND = 4, // RS4 1803
        ACCENT_ENABLE_HOST_BACKDROP = 5,     // RS5 1809
        ACCENT_INVALID_STATE = 6             // Using this value will remove the window background
    };

    enum ACCENT_FLAG {
        ACCENT_NONE = 0,
        ACCENT_ENABLE_ACRYLIC = 1,
        ACCENT_ENABLE_ACRYLIC_WITH_LUMINOSITY = 482
    };

    struct ACCENT_POLICY {
        DWORD dwAccentState;
        DWORD dwAccentFlags;
        DWORD dwGradientColor; // #AABBGGRR
        DWORD dwAnimationId;
    };
    using PACCENT_POLICY = ACCENT_POLICY *;

    struct WINDOWCOMPOSITIONATTRIBDATA {
        WINDOWCOMPOSITIONATTRIB Attrib;
        PVOID pvData;
        SIZE_T cbData;
    };
    using PWINDOWCOMPOSITIONATTRIBDATA = WINDOWCOMPOSITIONATTRIBDATA *;

    using SetWindowCompositionAttributePtr = BOOL(WINAPI *)(HWND, PWINDOWCOMPOSITIONATTRIBDATA);

    namespace {

        struct DynamicApis {
            static const DynamicApis &instance() {
                static const DynamicApis inst{};
                return inst;
            }

#define DYNAMIC_API_DECLARE(NAME) decltype(&::NAME) p##NAME = nullptr

            DYNAMIC_API_DECLARE(DwmFlush);
            DYNAMIC_API_DECLARE(DwmIsCompositionEnabled);
            DYNAMIC_API_DECLARE(DwmGetCompositionTimingInfo);
            DYNAMIC_API_DECLARE(DwmGetWindowAttribute);
            DYNAMIC_API_DECLARE(DwmSetWindowAttribute);
            DYNAMIC_API_DECLARE(DwmExtendFrameIntoClientArea);
            DYNAMIC_API_DECLARE(DwmEnableBlurBehindWindow);
            DYNAMIC_API_DECLARE(GetDpiForWindow);
            DYNAMIC_API_DECLARE(GetSystemMetricsForDpi);
            DYNAMIC_API_DECLARE(GetDpiForMonitor);
            DYNAMIC_API_DECLARE(timeGetDevCaps);
            DYNAMIC_API_DECLARE(timeBeginPeriod);
            DYNAMIC_API_DECLARE(timeEndPeriod);

#undef DYNAMIC_API_DECLARE

            SetWindowCompositionAttributePtr pSetWindowCompositionAttribute = nullptr;

        private:
            DynamicApis() {
#define DYNAMIC_API_RESOLVE(DLL, NAME)                                                             \
    p##NAME = reinterpret_cast<decltype(p##NAME)>(DLL.resolve(#NAME))

                QSystemLibrary user32(QStringLiteral("user32"));
                DYNAMIC_API_RESOLVE(user32, GetDpiForWindow);
                DYNAMIC_API_RESOLVE(user32, GetSystemMetricsForDpi);
                DYNAMIC_API_RESOLVE(user32, SetWindowCompositionAttribute);

                QSystemLibrary shcore(QStringLiteral("shcore"));
                DYNAMIC_API_RESOLVE(shcore, GetDpiForMonitor);

                QSystemLibrary dwmapi(QStringLiteral("dwmapi"));
                DYNAMIC_API_RESOLVE(dwmapi, DwmFlush);
                DYNAMIC_API_RESOLVE(dwmapi, DwmIsCompositionEnabled);
                DYNAMIC_API_RESOLVE(dwmapi, DwmGetCompositionTimingInfo);
                DYNAMIC_API_RESOLVE(dwmapi, DwmGetWindowAttribute);
                DYNAMIC_API_RESOLVE(dwmapi, DwmSetWindowAttribute);
                DYNAMIC_API_RESOLVE(dwmapi, DwmExtendFrameIntoClientArea);
                DYNAMIC_API_RESOLVE(dwmapi, DwmEnableBlurBehindWindow);

                QSystemLibrary winmm(QStringLiteral("winmm"));
                DYNAMIC_API_RESOLVE(winmm, timeGetDevCaps);
                DYNAMIC_API_RESOLVE(winmm, timeBeginPeriod);
                DYNAMIC_API_RESOLVE(winmm, timeEndPeriod);

#undef DYNAMIC_API_RESOLVE
            }

            ~DynamicApis() = default;

            Q_DISABLE_COPY_MOVE(DynamicApis)
        };

    }

    static inline constexpr bool operator==(const POINT &lhs, const POINT &rhs) noexcept {
        return ((lhs.x == rhs.x) && (lhs.y == rhs.y));
    }

    static inline constexpr bool operator!=(const POINT &lhs, const POINT &rhs) noexcept {
        return !operator==(lhs, rhs);
    }

    static inline constexpr bool operator==(const SIZE &lhs, const SIZE &rhs) noexcept {
        return ((lhs.cx == rhs.cx) && (lhs.cy == rhs.cy));
    }

    static inline constexpr bool operator!=(const SIZE &lhs, const SIZE &rhs) noexcept {
        return !operator==(lhs, rhs);
    }

    static inline constexpr bool operator>(const SIZE &lhs, const SIZE &rhs) noexcept {
        return ((lhs.cx * lhs.cy) > (rhs.cx * rhs.cy));
    }

    static inline constexpr bool operator>=(const SIZE &lhs, const SIZE &rhs) noexcept {
        return (operator>(lhs, rhs) || operator==(lhs, rhs));
    }

    static inline constexpr bool operator<(const SIZE &lhs, const SIZE &rhs) noexcept {
        return (operator!=(lhs, rhs) && !operator>(lhs, rhs));
    }

    static inline constexpr bool operator<=(const SIZE &lhs, const SIZE &rhs) noexcept {
        return (operator<(lhs, rhs) || operator==(lhs, rhs));
    }

    static inline constexpr bool operator==(const RECT &lhs, const RECT &rhs) noexcept {
        return ((lhs.left == rhs.left) && (lhs.top == rhs.top) && (lhs.right == rhs.right) &&
                (lhs.bottom == rhs.bottom));
    }

    static inline constexpr bool operator!=(const RECT &lhs, const RECT &rhs) noexcept {
        return !operator==(lhs, rhs);
    }

    static inline constexpr QPoint point2qpoint(const POINT &point) {
        return QPoint{int(point.x), int(point.y)};
    }

    static inline constexpr POINT qpoint2point(const QPoint &point) {
        return POINT{LONG(point.x()), LONG(point.y())};
    }

    static inline constexpr QSize size2qsize(const SIZE &size) {
        return QSize{int(size.cx), int(size.cy)};
    }

    static inline constexpr SIZE qsize2size(const QSize &size) {
        return SIZE{LONG(size.width()), LONG(size.height())};
    }

    static inline constexpr QRect rect2qrect(const RECT &rect) {
        return QRect{
            QPoint{int(rect.left),        int(rect.top)         },
            QSize{int(RECT_WIDTH(rect)), int(RECT_HEIGHT(rect))}
        };
    }

    static inline constexpr RECT qrect2rect(const QRect &qrect) {
        return RECT{LONG(qrect.left()), LONG(qrect.top()), LONG(qrect.right()),
                    LONG(qrect.bottom())};
    }

    static inline /*constexpr*/ QString hwnd2str(const WId windowId) {
        // NULL handle is allowed here.
        return QLatin1String("0x") +
               QString::number(windowId, 16).toUpper().rightJustified(8, u'0');
    }

    static inline /*constexpr*/ QString hwnd2str(HWND hwnd) {
        // NULL handle is allowed here.
        return hwnd2str(reinterpret_cast<WId>(hwnd));
    }

    static inline bool isWin8OrGreater() {
        static const bool result = IsWindows8OrGreater_Real();
        return result;
    }

    static inline bool isWin8Point1OrGreater() {
        static const bool result = IsWindows8Point1OrGreater_Real();
        return result;
    }

    static inline bool isWin10OrGreater() {
        static const bool result = IsWindows10OrGreater_Real();
        return result;
    }

    static inline bool isWin11OrGreater() {
        static const bool result = IsWindows11OrGreater_Real();
        return result;
    }

    static inline bool isWin1122H2OrGreater() {
        static const bool result = IsWindows1122H2OrGreater_Real();
        return result;
    }

    static inline bool isDwmCompositionEnabled() {
        if (isWin8OrGreater()) {
            return true;
        }
        const DynamicApis &apis = DynamicApis::instance();
        if (!apis.pDwmIsCompositionEnabled) {
            return false;
        }
        BOOL enabled = FALSE;
        return SUCCEEDED(apis.pDwmIsCompositionEnabled(&enabled)) && enabled;
    }

    static inline bool isWindowFrameBorderColorized() {
        const QWinRegistryKey registry(HKEY_CURRENT_USER, LR"(Software\Microsoft\Windows\DWM)");
        if (!registry.isValid()) {
            return false;
        }
        const auto value = registry.dwordValue(L"ColorPrevalence");
        if (!value.second) {
            return false;
        }
        return value.first;
    }

    static inline bool isDarkThemeActive() {
#if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
        return QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Dark;
#else
        const QWinRegistryKey registry(
            HKEY_CURRENT_USER, LR"(Software\Microsoft\Windows\CurrentVersion\Themes\Personalize)");
        if (!registry.isValid()) {
            return false;
        }
        const auto value = registry.dwordValue(L"AppsUseLightTheme");
        if (!value.second) {
            return false;
        }
        return !value.first;
#endif
    }

    static inline bool isDarkWindowFrameEnabled(HWND hwnd) {
        BOOL enabled = FALSE;
        const DynamicApis &apis = DynamicApis::instance();
        if (SUCCEEDED(apis.pDwmGetWindowAttribute(hwnd, _DWMWA_USE_IMMERSIVE_DARK_MODE, &enabled,
                                                  sizeof(enabled)))) {
            return enabled;
        } else if (SUCCEEDED(apis.pDwmGetWindowAttribute(hwnd,
                                                         _DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1,
                                                         &enabled, sizeof(enabled)))) {
            return enabled;
        } else {
            return false;
        }
    }

    static inline QColor getAccentColor() {
#if QT_VERSION >= QT_VERSION_CHECK(6, 6, 0)
        return QGuiApplication::palette().color(QPalette::Accent);
#else
        const QWinRegistryKey registry(HKEY_CURRENT_USER, LR"(Software\Microsoft\Windows\DWM)");
        if (!registry.isValid()) {
            return {};
        }
        const auto value = registry.dwordValue(L"AccentColor");
        if (!value.second) {
            return {};
        }
        // The retrieved value is in the #AABBGGRR format, we need to
        // convert it to the #AARRGGBB format which Qt expects.
        const QColor abgr = QColor::fromRgba(value.first);
        if (!abgr.isValid()) {
            return {};
        }
        return QColor::fromRgb(abgr.blue(), abgr.green(), abgr.red(), abgr.alpha());
#endif
    }

}

#endif // QWKWINDOWSEXTRA_P_H