#include "Frameless.h"
#include "Theme.h"
#include "Utilities.h"
#include <QQuickWindow>
#include <dwmapi.h>
#include <qt_windows.h>
#include <windowsx.h>

static inline void setShadow(HWND hwnd) {
    const MARGINS shadow = {1, 0, 0, 0};
    typedef HRESULT(WINAPI * DwmExtendFrameIntoClientAreaPtr)(HWND hWnd, const MARGINS *pMarInset);
    HMODULE module = LoadLibrary(L"dwmapi.dll");
    if (module) {
        DwmExtendFrameIntoClientAreaPtr dwm_extendframe_into_client_area_;
        dwm_extendframe_into_client_area_ =
            reinterpret_cast<DwmExtendFrameIntoClientAreaPtr>(GetProcAddress(module, "DwmExtendFrameIntoClientArea"));
        if (dwm_extendframe_into_client_area_) {
            dwm_extendframe_into_client_area_(hwnd, &shadow);
        }
    }
}

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

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

typedef HRESULT(WINAPI *DwmSetWindowAttributeFunc)(HWND hwnd, DWORD dwAttribute, LPCVOID pvAttribute,
                                                   DWORD cbAttribute);
typedef HRESULT(WINAPI *DwmExtendFrameIntoClientAreaFunc)(HWND hwnd, const MARGINS *pMarInset);
typedef HRESULT(WINAPI *DwmIsCompositionEnabledFunc)(BOOL *pfEnabled);
typedef HRESULT(WINAPI *DwmEnableBlurBehindWindowFunc)(HWND hWnd, const DWM_BLURBEHIND *pBlurBehind);
typedef BOOL(WINAPI *SetWindowCompositionAttributeFunc)(HWND hwnd, const WINDOWCOMPOSITIONATTRIBDATA *);

static DwmSetWindowAttributeFunc pDwmSetWindowAttribute = nullptr;
static DwmExtendFrameIntoClientAreaFunc pDwmExtendFrameIntoClientArea = nullptr;
static DwmIsCompositionEnabledFunc pDwmIsCompositionEnabled = nullptr;
static DwmEnableBlurBehindWindowFunc pDwmEnableBlurBehindWindow = nullptr;
static SetWindowCompositionAttributeFunc pSetWindowCompositionAttribute = nullptr;
static RTL_OSVERSIONINFOW GetRealOSVersionImpl() {
    HMODULE hMod = ::GetModuleHandleW(L"ntdll.dll");
    using RtlGetVersionPtr = NTSTATUS(WINAPI *)(PRTL_OSVERSIONINFOW);
    auto pRtlGetVersion = reinterpret_cast<RtlGetVersionPtr>(::GetProcAddress(hMod, "RtlGetVersion"));
    RTL_OSVERSIONINFOW rovi{};
    rovi.dwOSVersionInfoSize = sizeof(rovi);
    pRtlGetVersion(&rovi);
    return rovi;
}

RTL_OSVERSIONINFOW GetRealOSVersion() {
    static const auto result = GetRealOSVersionImpl();
    return result;
}

static inline bool isWin7Only() {
    RTL_OSVERSIONINFOW rovi = GetRealOSVersion();
    return rovi.dwMajorVersion = 7;
}

static inline bool isWin11OrGreater() {
    RTL_OSVERSIONINFOW rovi = GetRealOSVersion();
    return (rovi.dwMajorVersion > 10) ||
           (rovi.dwMajorVersion == 10 && rovi.dwMinorVersion >= 0 && rovi.dwBuildNumber >= 22000);
}

static bool containsCursorToItem(QQuickItem *item) {
    auto window = item->window();
    if ((window == nullptr) || !item || !item->isVisible()) {
        return false;
    }
    auto point = window->mapFromGlobal(QCursor::pos());
    auto rect = QRectF(item->mapToItem(window->contentItem(), QPointF(0, 0)), item->size());
    if (rect.contains(point)) {
        return true;
    }
    return false;
}

static inline bool initializeFunctionPointers() {
    HMODULE module = LoadLibraryW(L"dwmapi.dll");
    if (module) {
        if (!pDwmSetWindowAttribute) {
            pDwmSetWindowAttribute =
                reinterpret_cast<DwmSetWindowAttributeFunc>(GetProcAddress(module, "DwmSetWindowAttribute"));
            if (!pDwmSetWindowAttribute) {
                return false;
            }
        }
        if (!pDwmExtendFrameIntoClientArea) {
            pDwmExtendFrameIntoClientArea = reinterpret_cast<DwmExtendFrameIntoClientAreaFunc>(
                GetProcAddress(module, "DwmExtendFrameIntoClientArea"));
            if (!pDwmExtendFrameIntoClientArea) {
                return false;
            }
        }
        if (!pDwmIsCompositionEnabled) {
            pDwmIsCompositionEnabled =
                reinterpret_cast<DwmIsCompositionEnabledFunc>(::GetProcAddress(module, "DwmIsCompositionEnabled"));
            if (!pDwmIsCompositionEnabled) {
                return false;
            }
        }
        if (!pDwmEnableBlurBehindWindow) {
            pDwmEnableBlurBehindWindow =
                reinterpret_cast<DwmEnableBlurBehindWindowFunc>(GetProcAddress(module, "DwmEnableBlurBehindWindow"));
            if (!pDwmEnableBlurBehindWindow) {
                return false;
            }
        }
        if (!pSetWindowCompositionAttribute) {
            HMODULE user32 = LoadLibraryW(L"user32.dll");
            if (!user32) {
                return false;
            }
            pSetWindowCompositionAttribute = reinterpret_cast<SetWindowCompositionAttributeFunc>(
                GetProcAddress(user32, "SetWindowCompositionAttribute"));
            if (!pSetWindowCompositionAttribute) {
                return false;
            }
        }
    }
    return true;
}

static inline bool isWin1122H2OrGreater() {
    RTL_OSVERSIONINFOW rovi = GetRealOSVersion();
    return (rovi.dwMajorVersion > 10) ||
           (rovi.dwMajorVersion == 10 && rovi.dwMinorVersion >= 0 && rovi.dwBuildNumber >= 22621);
}

static inline bool setWindowDarkMode(HWND hwnd, const BOOL enable) {
    if (!initializeFunctionPointers()) {
        return false;
    }
    return bool(pDwmSetWindowAttribute(hwnd, 20, &enable, sizeof(BOOL)));
}

static inline bool isCompositionEnabled() {
    if (initializeFunctionPointers()) {
        BOOL composition_enabled = false;
        pDwmIsCompositionEnabled(&composition_enabled);
        return composition_enabled;
    }
    return false;
}

static inline bool isWin8OrGreater() {
    RTL_OSVERSIONINFOW rovi = GetRealOSVersion();
    return (rovi.dwMajorVersion > 6) || (rovi.dwMajorVersion == 6 && rovi.dwMinorVersion >= 2);
}

static inline bool setWindowEffect(HWND hwnd, const QString &key, const bool &enable) {
    static constexpr const MARGINS extendedMargins = {-1, -1, -1, -1};
    if (key == QStringLiteral("mica")) {
        if (!isWin11OrGreater() || !initializeFunctionPointers()) {
            return false;
        }
        if (enable) {
            pDwmExtendFrameIntoClientArea(hwnd, &extendedMargins);
            if (isWin1122H2OrGreater()) {
                const DWORD backdropType = _DWMSBT_MAINWINDOW;
                pDwmSetWindowAttribute(hwnd, 38, &backdropType, sizeof(backdropType));
            } else {
                const BOOL enable = TRUE;
                pDwmSetWindowAttribute(hwnd, 1029, &enable, sizeof(enable));
            }
        } else {
            if (isWin1122H2OrGreater()) {
                const DWORD backdropType = _DWMSBT_AUTO;
                pDwmSetWindowAttribute(hwnd, 38, &backdropType, sizeof(backdropType));
            } else {
                const BOOL enable = FALSE;
                pDwmSetWindowAttribute(hwnd, 1029, &enable, sizeof(enable));
            }
        }
        BOOL isDark = Theme::instance()->dark();
        setWindowDarkMode(hwnd, isDark);
        return true;
    }

    if (key == QStringLiteral("mica-alt")) {
        if (!isWin1122H2OrGreater() || !initializeFunctionPointers()) {
            return false;
        }
        if (enable) {
            pDwmExtendFrameIntoClientArea(hwnd, &extendedMargins);
            const DWORD backdropType = _DWMSBT_TABBEDWINDOW;
            pDwmSetWindowAttribute(hwnd, 38, &backdropType, sizeof(backdropType));
        } else {
            const DWORD backdropType = _DWMSBT_AUTO;
            pDwmSetWindowAttribute(hwnd, 38, &backdropType, sizeof(backdropType));
        }
        BOOL isDark = Theme::instance()->dark();
        setWindowDarkMode(hwnd, isDark);
        return true;
    }

    if (key == QStringLiteral("acrylic")) {
        if (!isWin11OrGreater() || !initializeFunctionPointers()) {
            return false;
        }
        if (enable) {
            pDwmExtendFrameIntoClientArea(hwnd, &extendedMargins);
            DWORD system_backdrop_type = _DWMSBT_TRANSIENTWINDOW;
            pDwmSetWindowAttribute(hwnd, 38, &system_backdrop_type, sizeof(DWORD));
        } else {
            const DWORD backdropType = _DWMSBT_AUTO;
            pDwmSetWindowAttribute(hwnd, 38, &backdropType, sizeof(backdropType));
        }
        BOOL isDark = Theme::instance()->dark();
        setWindowDarkMode(hwnd, isDark);
        return true;
    }

    if (key == QStringLiteral("dwm-blur")) {
        if ((isWin7Only() && !isCompositionEnabled()) || !initializeFunctionPointers()) {
            return false;
        }
        BOOL isDark = Theme::instance()->dark();
        setWindowDarkMode(hwnd, isDark && enable);
        if (enable) {
            if (isWin8OrGreater()) {
                ACCENT_POLICY policy{};
                policy.dwAccentState = ACCENT_ENABLE_BLURBEHIND;
                policy.dwAccentFlags = ACCENT_NONE;
                WINDOWCOMPOSITIONATTRIBDATA wcad{};
                wcad.Attrib = WCA_ACCENT_POLICY;
                wcad.pvData = &policy;
                wcad.cbData = sizeof(policy);
                pSetWindowCompositionAttribute(hwnd, &wcad);
            } else {
                DWM_BLURBEHIND bb{};
                bb.fEnable = TRUE;
                bb.dwFlags = DWM_BB_ENABLE;
                pDwmEnableBlurBehindWindow(hwnd, &bb);
            }
        } else {
            if (isWin8OrGreater()) {
                ACCENT_POLICY policy{};
                policy.dwAccentState = ACCENT_DISABLED;
                policy.dwAccentFlags = ACCENT_NONE;
                WINDOWCOMPOSITIONATTRIBDATA wcad{};
                wcad.Attrib = WCA_ACCENT_POLICY;
                wcad.pvData = &policy;
                wcad.cbData = sizeof(policy);
                pSetWindowCompositionAttribute(hwnd, &wcad);
            } else {
                DWM_BLURBEHIND bb{};
                bb.fEnable = FALSE;
                bb.dwFlags = DWM_BB_ENABLE;
                pDwmEnableBlurBehindWindow(hwnd, &bb);
            }
        }
        return true;
    }
    return false;
}

Frameless::Frameless(QQuickItem *parent) : QQuickItem{parent} {
    m_isWindows11OrGreater = Utilities::instance()->isWindows11OrGreater();
    m_effect = "normal";
}

QQuickItem *Frameless::appBar() const {
    return m_appBar;
}

void Frameless::setAppBar(QQuickItem *appBar) {
    if (m_appBar != appBar) {
        m_appBar = appBar;
        emit appBarChanged();
    }
}

QQuickItem *Frameless::maximizeButton() const {
    return m_maximizeButton;
}

void Frameless::setMaximizeButton(QQuickItem *button) {
    if (m_maximizeButton != button) {
        m_maximizeButton = button;
        emit maximizeButtonChanged();
    }
}

QQuickItem *Frameless::minimizedButton() const {
    return m_minimizedButton;
}

void Frameless::setMinimizedButton(QQuickItem *button) {
    if (m_minimizedButton != button) {
        m_minimizedButton = button;
        emit minimizedButtonChanged();
    }
}

QQuickItem *Frameless::closeButton() const {
    return m_closeButton;
}

void Frameless::setCloseButton(QQuickItem *button) {
    if (m_closeButton != button) {
        m_closeButton = button;
        emit closeButtonChanged();
    }
}

bool Frameless::fixSize() const {
    return m_fixSize;
}

void Frameless::setFixSize(bool fix) {
    if (m_fixSize != fix) {
        m_fixSize = fix;
        emit fixSizeChanged();
    }
}

bool Frameless::topmost() const {
    return m_topmost;
}

void Frameless::setTopmost(bool topmost) {
    if (m_topmost != topmost) {
        m_topmost = topmost;
        emit topmostChanged();
    }
}

bool Frameless::disabled() const {
    return m_disabled;
}

void Frameless::setDisabled(bool disabled) {
    if (m_disabled != disabled) {
        m_disabled = disabled;
        emit disabledChanged();
    }
}

void Frameless::setHitTestVisible(QQuickItem *item) {
    if (!m_hitTestList.contains(item)) {
        m_hitTestList.append(item);
    }
}

void Frameless::showMaximized() {
#ifdef Q_OS_WIN
    HWND hwnd = reinterpret_cast<HWND>(window()->winId());
    ::ShowWindow(hwnd, 3);
#else
    window()->setVisibility(QQuickWindow::Maximized);
#endif
}

void Frameless::showMinimized() {
#ifdef Q_OS_WIN
    HWND hwnd = reinterpret_cast<HWND>(window()->winId());
    ::ShowWindow(hwnd, 2);
#else
    window()->setVisibility(QQuickWindow::Minimized);
#endif
}

void Frameless::showNormal() {
    window()->setVisibility(QQuickWindow::Windowed);
}

void Frameless::onDestruction() {
    QGuiApplication::instance()->removeNativeEventFilter(this);
}

void Frameless::componentComplete() {
    if (m_disabled) {
        return;
    }
    int w = window()->width();
    int h = window()->height();
    m_current = window()->winId();
    window()->setFlags((window()->flags()) | Qt::CustomizeWindowHint | Qt::WindowMinimizeButtonHint |
                       Qt::WindowCloseButtonHint);
    if (!m_fixSize) {
        window()->setFlag(Qt::WindowMaximizeButtonHint);
    }
    window()->installEventFilter(this);
    QGuiApplication::instance()->installNativeEventFilter(this);
    if (m_maximizeButton) {
        setHitTestVisible(m_maximizeButton);
    }
    if (m_minimizedButton) {
        setHitTestVisible(m_minimizedButton);
    }
    if (m_closeButton) {
        setHitTestVisible(m_closeButton);
    }
#ifdef Q_OS_WIN
#if (QT_VERSION == QT_VERSION_CHECK(6, 5, 3))
    qWarning() << "Qt's own frameless bug, currently only exist in 6.5.3, please use other versions";
#endif
    HWND hwnd = reinterpret_cast<HWND>(window()->winId());
    DWORD style = ::GetWindowLongPtr(hwnd, GWL_STYLE);
#if (QT_VERSION == QT_VERSION_CHECK(6, 7, 2))
    style &= ~(WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_SYSMENU);
#endif
    if (m_fixSize) {
        ::SetWindowLongPtr(hwnd, GWL_STYLE, style | WS_THICKFRAME | WS_CAPTION);
        ;
        for (int i = 0; i <= QGuiApplication::screens().count() - 1; ++i) {
            connect(QGuiApplication::screens().at(i), &QScreen::logicalDotsPerInchChanged, this, [=] {
                SetWindowPos(hwnd, nullptr, 0, 0, 0, 0,
                             SWP_NOZORDER | SWP_NOOWNERZORDER | SWP_NOMOVE | SWP_FRAMECHANGED);
            });
        }
    } else {
        ::SetWindowLongPtr(hwnd, GWL_STYLE, style | WS_MAXIMIZEBOX | WS_THICKFRAME | WS_CAPTION);
    }
    SetWindowPos(hwnd, nullptr, 0, 0, 0, 0,
                 SWP_NOZORDER | SWP_NOOWNERZORDER | SWP_NOMOVE | SWP_NOSIZE | SWP_FRAMECHANGED);
    connect(window(), &QQuickWindow::screenChanged, this, [hwnd] {
        ::SetWindowPos(hwnd, nullptr, 0, 0, 0, 0,
                       SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED | SWP_NOOWNERZORDER);
        ::RedrawWindow(hwnd, nullptr, nullptr, RDW_INVALIDATE | RDW_UPDATENOW);
    });
    if (!window()->property("_hideShadow").toBool()) {
        setShadow(hwnd);
    }
    if (isWin11OrGreater()) {
        availableEffects({"mica", "mica-alt", "acrylic", "dwm-blur", "normal"});
    } else if (isWin7Only()) {
        availableEffects({"dwm-blur", "normal"});
    }
    if (!m_effect.isEmpty()) {
        effective(setWindowEffect(hwnd, m_effect, true));
        if (effective()) {
            m_currentEffect = effect();
        }
    }
    connect(this, &Frameless::effectChanged, this, [hwnd, this] {
        if (effect() == m_currentEffect) {
            return;
        }
        if (effective()) {
            setWindowEffect(hwnd, m_currentEffect, false);
        }
        effective(setWindowEffect(hwnd, effect(), true));
        if (effective()) {
            m_currentEffect = effect();
        } else {
            m_effect = "normal";
            m_currentEffect = "normal";
        }
    });
    connect(Theme::instance(), &Theme::blurBehindWindowEnabledChanged, this, [this] {
        if (Theme::instance()->blurBehindWindowEnabled()) {
            effect("normal");
        }
    });
    connect(Theme::instance(), &Theme::darkChanged, this, [hwnd, this] {
        if (effective() && !m_currentEffect.isEmpty() && m_currentEffect != "normal") {
            setWindowDarkMode(hwnd, Theme::instance()->dark());
        }
    });
#endif
    auto appBarHeight = m_appBar->height();
    h = qRound(h + appBarHeight);
    if (m_fixSize) {
        window()->setMaximumSize(QSize(w, h));
        window()->setMinimumSize(QSize(w, h));
    } else {
        window()->setMinimumHeight(window()->minimumHeight() + appBarHeight);
        window()->setMaximumHeight(window()->maximumHeight() + appBarHeight);
    }
    window()->resize(QSize(w, h));
    connect(this, &Frameless::topmostChanged, this, [this] { setWindowTopmost(topmost()); });
    setWindowTopmost(topmost());
}

bool Frameless::eventFilter(QObject *obj, QEvent *event) {
#ifndef Q_OS_WIN
    switch (ev->type()) {
    case QEvent::MouseButtonPress:
        if (_edges != 0) {
            QMouseEvent *event = static_cast<QMouseEvent *>(ev);
            if (event->button() == Qt::LeftButton) {
                _updateCursor(_edges);
                window()->startSystemResize(Qt::Edges(_edges));
            }
        } else {
            if (_hitAppBar()) {
                qint64 clickTimer = QDateTime::currentMSecsSinceEpoch();
                qint64 offset = clickTimer - this->_clickTimer;
                this->_clickTimer = clickTimer;
                if (offset < 300) {
                    if (_isMaximized()) {
                        showNormal();
                    } else {
                        showMaximized();
                    }
                } else {
                    window()->startSystemMove();
                }
            }
        }
        break;
    case QEvent::MouseButtonRelease:
        _edges = 0;
        break;
    case QEvent::MouseMove: {
        if (_isMaximized() || _isFullScreen()) {
            break;
        }
        if (_fixSize) {
            break;
        }
        QMouseEvent *event = static_cast<QMouseEvent *>(ev);
        QPoint p =
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
            event->pos();
#else
            event->position().toPoint();
#endif
        if (p.x() >= _margins && p.x() <= (window()->width() - _margins) && p.y() >= _margins &&
            p.y() <= (window()->height() - _margins)) {
            if (_edges != 0) {
                _edges = 0;
                _updateCursor(_edges);
            }
            break;
        }
        _edges = 0;
        if (p.x() < _margins) {
            _edges |= Qt::LeftEdge;
        }
        if (p.x() > (window()->width() - _margins)) {
            _edges |= Qt::RightEdge;
        }
        if (p.y() < _margins) {
            _edges |= Qt::TopEdge;
        }
        if (p.y() > (window()->height() - _margins)) {
            _edges |= Qt::BottomEdge;
        }
        _updateCursor(_edges);
        break;
    }
    default:
        break;
    }
#endif
    return QObject::eventFilter(obj, event);
}

bool Frameless::nativeEventFilter(const QByteArray &eventType, void *message, qintptr *result) {
#ifdef Q_OS_WIN
    if ((eventType != "windows_generic_MSG") || !message) {
        return false;
    }
    const auto msg = static_cast<const MSG *>(message);
    auto hwnd = msg->hwnd;
    if (!hwnd) {
        return false;
    }
    const quint64 wid = reinterpret_cast<qint64>(hwnd);
    if (wid != m_current) {
        return false;
    }
    const auto uMsg = msg->message;
    const auto wParam = msg->wParam;
    const auto lParam = msg->lParam;
    if (uMsg == WM_WINDOWPOSCHANGING) {
        auto *wp = reinterpret_cast<WINDOWPOS *>(lParam);
        if (wp != nullptr && (wp->flags & SWP_NOSIZE) == 0) {
            wp->flags |= SWP_NOCOPYBITS;
            *result = static_cast<qintptr>(::DefWindowProcW(hwnd, uMsg, wParam, lParam));
            return true;
        }
        return false;
    } else if (uMsg == WM_NCCALCSIZE && wParam == TRUE) {
        bool isMaximum = ::IsZoomed(hwnd);
        if (isMaximum) {
            window()->setProperty("__margins", 7);
        } else {
            window()->setProperty("__margins", 0);
        }
        setMaximizeHovered(false);
        *result = WVR_REDRAW;
        return true;
    } else if (uMsg == WM_NCHITTEST) {
        if (m_isWindows11OrGreater) {
            if (hitMaximizeButton()) {
                if (*result == HTNOWHERE) {
                    *result = HTZOOM;
                }
                setMaximizeHovered(true);
                return true;
            }
            setMaximizeHovered(false);
            setMaximizePressed(false);
        }
        *result = 0;
        POINT nativeGlobalPos{GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};
        POINT nativeLocalPos = nativeGlobalPos;
        ::ScreenToClient(hwnd, &nativeLocalPos);
        RECT clientRect{0, 0, 0, 0};
        ::GetClientRect(hwnd, &clientRect);
        auto clientWidth = clientRect.right - clientRect.left;
        auto clientHeight = clientRect.bottom - clientRect.top;
        bool left = nativeLocalPos.x < m_margins;
        bool right = nativeLocalPos.x > clientWidth - m_margins;
        bool top = nativeLocalPos.y < m_margins;
        bool bottom = nativeLocalPos.y > clientHeight - m_margins;
        *result = 0;
        if (!m_fixSize && !isFullScreen() && !isMaximized()) {
            if (left && top) {
                *result = HTTOPLEFT;
            } else if (left && bottom) {
                *result = HTBOTTOMLEFT;
            } else if (right && top) {
                *result = HTTOPRIGHT;
            } else if (right && bottom) {
                *result = HTBOTTOMRIGHT;
            } else if (left) {
                *result = HTLEFT;
            } else if (right) {
                *result = HTRIGHT;
            } else if (top) {
                *result = HTTOP;
            } else if (bottom) {
                *result = HTBOTTOM;
            }
        }
        if (0 != *result) {
            return true;
        }
        if (hitAppBar()) {
            *result = HTCAPTION;
            return true;
        }
        *result = HTCLIENT;
        return true;
    } else if (uMsg == WM_NCPAINT) {
        *result = FALSE;
        return false;
    } else if (uMsg == WM_NCACTIVATE) {
        *result = TRUE;
        return true;
    } else if (m_isWindows11OrGreater && (uMsg == WM_NCLBUTTONDBLCLK || uMsg == WM_NCLBUTTONDOWN)) {
        if (hitMaximizeButton()) {
            QMouseEvent event = QMouseEvent(QEvent::MouseButtonPress, QPoint(), QPoint(), Qt::LeftButton,
                                            Qt::LeftButton, Qt::NoModifier);
            QGuiApplication::sendEvent(m_maximizeButton, &event);
            setMaximizePressed(true);
            return true;
        }
    } else if (m_isWindows11OrGreater && (uMsg == WM_NCLBUTTONUP || uMsg == WM_NCRBUTTONUP)) {
        if (hitMaximizeButton()) {
            QMouseEvent event = QMouseEvent(QEvent::MouseButtonRelease, QPoint(), QPoint(), Qt::LeftButton,
                                            Qt::LeftButton, Qt::NoModifier);
            QGuiApplication::sendEvent(m_maximizeButton, &event);
            setMaximizePressed(false);
            return true;
        }
    } else if (uMsg == WM_NCRBUTTONDOWN) {
        if (wParam == HTCAPTION) {
            auto pos = window()->position();
            auto offset = window()->mapFromGlobal(QCursor::pos());
            showSystemMenu(QPoint(pos.x() + offset.x(), pos.y() + offset.y()));
        }
    } else if (uMsg == WM_KEYDOWN || uMsg == WM_SYSKEYDOWN) {
        const bool altPressed = ((wParam == VK_MENU) || (::GetKeyState(VK_MENU) < 0));
        const bool spacePressed = ((wParam == VK_SPACE) || (::GetKeyState(VK_SPACE) < 0));
        if (altPressed && spacePressed) {
            auto pos = window()->position();
            showSystemMenu(QPoint(pos.x(), qRound(pos.y() + m_appBar->height())));
        }
    } else if (uMsg == WM_SYSCOMMAND) {
        if (wParam == SC_MINIMIZE) {
            if (window()->transientParent()) {
                auto _hwnd = reinterpret_cast<HWND>(window()->transientParent()->winId());
                ::ShowWindow(_hwnd, 2);
            } else {
                auto _hwnd = reinterpret_cast<HWND>(window()->winId());
                ::ShowWindow(_hwnd, 2);
            }
            return true;
        }
        return false;
    }
    return false;
#else
    return false;
#endif
}

bool Frameless::isFullScreen() {
    return window()->visibility() == QWindow::FullScreen;
}

bool Frameless::isMaximized() {
    return window()->visibility() == QWindow::Maximized;
}

void Frameless::setMaximizeHovered(bool val) {
    if (m_maximizeButton) {
        m_maximizeButton->setProperty("hover", val);
    }
}

void Frameless::setMaximizePressed(bool val) {
    if (m_maximizeButton) {
        m_maximizeButton->setProperty("down", val);
    }
}

void Frameless::setWindowTopmost(bool topmost) {
#ifdef Q_OS_WIN
    HWND hwnd = reinterpret_cast<HWND>(window()->winId());
    if (topmost) {
        ::SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
    } else {
        ::SetWindowPos(hwnd, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
    }
#else
    window()->setFlag(Qt::WindowStaysOnTopHint, topmost);
#endif
}

bool Frameless::hitMaximizeButton() {
    if (containsCursorToItem(m_maximizeButton)) {
        return true;
    }
    return false;
}

bool Frameless::hitAppBar() {
    for (int i = 0; i <= m_hitTestList.size() - 1; ++i) {
        auto item = m_hitTestList.at(i);
        if (containsCursorToItem(item)) {
            return false;
        }
    }
    if ((m_appBar != nullptr) && containsCursorToItem(m_appBar)) {
        return true;
    }
    return false;
}

void Frameless::showSystemMenu(QPoint point) {
#ifdef Q_OS_WIN
    QScreen *screen = window()->screen();
    if (!screen) {
        screen = QGuiApplication::primaryScreen();
    }
    if (!screen) {
        return;
    }
    const QPoint origin = screen->geometry().topLeft();
    auto nativePos = QPointF(QPointF(point - origin) * window()->devicePixelRatio()).toPoint() + origin;
    HWND hwnd = reinterpret_cast<HWND>(window()->winId());
    auto hMenu = ::GetSystemMenu(hwnd, FALSE);
    if (isMaximized() || isFullScreen()) {
        ::EnableMenuItem(hMenu, SC_MOVE, MFS_DISABLED);
        ::EnableMenuItem(hMenu, SC_RESTORE, MFS_ENABLED);
    } else {
        ::EnableMenuItem(hMenu, SC_MOVE, MFS_ENABLED);
        ::EnableMenuItem(hMenu, SC_RESTORE, MFS_DISABLED);
    }
    if (!m_fixSize && !isMaximized() && !isFullScreen()) {
        ::EnableMenuItem(hMenu, SC_SIZE, MFS_ENABLED);
        ::EnableMenuItem(hMenu, SC_MAXIMIZE, MFS_ENABLED);
    } else {
        ::EnableMenuItem(hMenu, SC_SIZE, MFS_DISABLED);
        ::EnableMenuItem(hMenu, SC_MAXIMIZE, MFS_DISABLED);
    }
    const int result =
        ::TrackPopupMenu(hMenu, (TPM_RETURNCMD | (QGuiApplication::isRightToLeft() ? TPM_RIGHTALIGN : TPM_LEFTALIGN)),
                         nativePos.x(), nativePos.y(), 0, hwnd, nullptr);
    if (result) {
        ::PostMessageW(hwnd, WM_SYSCOMMAND, result, 0);
    }
#endif
}