/*
 * MIT License
 *
 * Copyright (C) 2022 by wangwenx190 (Yuhang Zhao)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#pragma once

#include <QtCore/qglobal.h>
#include <QtCore/qobject.h>
#include <QtCore/qpoint.h>
#include <QtCore/qsize.h>
#include <QtCore/qpointer.h>
#include <QtGui/qcolor.h>
#include <QtGui/qwindowdefs.h>

QT_BEGIN_NAMESPACE
class QScreen;
QT_END_NAMESPACE

#ifndef FRAMELESSHELPER_CORE_API
#  ifdef FRAMELESSHELPER_CORE_STATIC
#    define FRAMELESSHELPER_CORE_API
#  else
#    ifdef FRAMELESSHELPER_CORE_LIBRARY
#      define FRAMELESSHELPER_CORE_API Q_DECL_EXPORT
#    else
#      define FRAMELESSHELPER_CORE_API Q_DECL_IMPORT
#    endif
#  endif
#endif

#if defined(Q_OS_WIN) && !defined(Q_OS_WINDOWS)
#  define Q_OS_WINDOWS
#endif

#ifndef Q_DISABLE_COPY_MOVE
#  define Q_DISABLE_COPY_MOVE(Class) \
      Q_DISABLE_COPY(Class) \
      Class(Class &&) = delete; \
      Class &operator=(Class &&) = delete;
#endif

#if (QT_VERSION < QT_VERSION_CHECK(5, 7, 0))
#  define qAsConst(i) std::as_const(i)
#endif

#if (QT_VERSION < QT_VERSION_CHECK(5, 10, 0))
#  define QStringView const QString &
#else
#  include <QtCore/qstringview.h>
#endif

#if (QT_VERSION < QT_VERSION_CHECK(5, 14, 0))
#  define qExchange(a, b) std::exchange(a, b)
#  define Q_NAMESPACE_EXPORT(ns) Q_NAMESPACE
#endif

#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
#  define Q_NODISCARD [[nodiscard]]
#else
#  define Q_NODISCARD
#endif

#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
using NATIVE_EVENT_RESULT_TYPE = qintptr;
#else
using NATIVE_EVENT_RESULT_TYPE = long;
#endif

#ifndef QUtf8String
#  define QUtf8String(str) QString::fromUtf8(str)
#endif

#ifndef QU8Str
#  define QU8Str(str) QUtf8String(str)
#endif

#ifndef FRAMELESSHELPER_STRING_LITERAL
#  if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
#    define FRAMELESSHELPER_STRING_LITERAL(str) u##str##_qs
#  else
#    define FRAMELESSHELPER_STRING_LITERAL(str) QStringLiteral(str)
#  endif
#endif

#ifndef FRAMELESSHELPER_STRING_CONSTANT2
#  define FRAMELESSHELPER_STRING_CONSTANT2(name, str) \
     [[maybe_unused]] static const QString k##name = FRAMELESSHELPER_STRING_LITERAL(str);
#endif

#ifndef FRAMELESSHELPER_STRING_CONSTANT
#  define FRAMELESSHELPER_STRING_CONSTANT(str) FRAMELESSHELPER_STRING_CONSTANT2(str, #str)
#endif

#ifndef FRAMELESSHELPER_NAMESPACE
#  define FRAMELESSHELPER_NAMESPACE __flh_ns
#endif

#ifndef FRAMELESSHELPER_BEGIN_NAMESPACE
#  define FRAMELESSHELPER_BEGIN_NAMESPACE namespace FRAMELESSHELPER_NAMESPACE {
#endif

#ifndef FRAMELESSHELPER_END_NAMESPACE
#  define FRAMELESSHELPER_END_NAMESPACE }
#endif

#ifndef FRAMELESSHELPER_USE_NAMESPACE
#  define FRAMELESSHELPER_USE_NAMESPACE using namespace FRAMELESSHELPER_NAMESPACE;
#endif

#ifndef FRAMELESSHELPER_PREPEND_NAMESPACE
#  define FRAMELESSHELPER_PREPEND_NAMESPACE(X) ::FRAMELESSHELPER_NAMESPACE::X
#endif

FRAMELESSHELPER_BEGIN_NAMESPACE

namespace FramelessHelper::Core
{
FRAMELESSHELPER_CORE_API void initialize();
}

namespace Global
{

Q_NAMESPACE_EXPORT(FRAMELESSHELPER_CORE_API)

[[maybe_unused]] static constexpr const int kDefaultResizeBorderThickness = 8;
[[maybe_unused]] static constexpr const int kDefaultCaptionHeight = 23;
[[maybe_unused]] static constexpr const int kDefaultTitleBarHeight = 30;
[[maybe_unused]] static constexpr const int kDefaultWindowFrameBorderThickness = 1;

[[maybe_unused]] static constexpr const QColor kDefaultBlackColor = {0, 0, 0}; // #000000
[[maybe_unused]] static constexpr const QColor kDefaultWhiteColor = {255, 255, 255}; // #FFFFFF
[[maybe_unused]] static constexpr const QColor kDefaultDarkGrayColor = {169, 169, 169}; // #A9A9A9
[[maybe_unused]] static constexpr const QColor kDefaultSystemLightColor = {240, 240, 240}; // #F0F0F0
[[maybe_unused]] static constexpr const QColor kDefaultSystemDarkColor = {32, 32, 32}; // #202020
[[maybe_unused]] static constexpr const QColor kDefaultFrameBorderActiveColor = {77, 77, 77}; // #4D4D4D
[[maybe_unused]] static constexpr const QColor kDefaultFrameBorderInactiveColorDark = {87, 89, 89}; // #575959
[[maybe_unused]] static constexpr const QColor kDefaultFrameBorderInactiveColorLight = {166, 166, 166}; // #A6A6A6

[[maybe_unused]] static constexpr const QSize kDefaultSystemButtonSize = {int(qRound(qreal(kDefaultTitleBarHeight) * 1.5)), kDefaultTitleBarHeight};
[[maybe_unused]] static constexpr const QSize kDefaultSystemButtonIconSize = {16, 16};

[[maybe_unused]] static constexpr const char kUsePureQtImplFlag[] = "FRAMELESSHELPER_PURE_QT_IMPLEMENTATION";
[[maybe_unused]] static constexpr const char kForceHideFrameBorderFlag[] = "FRAMELESSHELPER_FORCE_HIDE_FRAME_BORDER";
[[maybe_unused]] static constexpr const char kForceShowFrameBorderFlag[] = "FRAMELESSHELPER_FORCE_SHOW_FRAME_BORDER";

FRAMELESSHELPER_STRING_CONSTANT2(ConfigFileName, ".framelesshelper.ini")
FRAMELESSHELPER_STRING_CONSTANT2(UsePureQtImplKeyPath, "Options/UsePureQtImplementation")
FRAMELESSHELPER_STRING_CONSTANT2(ForceHideFrameBorderKeyPath, "Options/ForceHideFrameBorder")
FRAMELESSHELPER_STRING_CONSTANT2(ForceShowFrameBorderKeyPath, "Options/ForceShowFrameBorder")

[[maybe_unused]] static constexpr const QSize kInvalidWindowSize = {160, 160};

enum class Option : int
{
    Default                               = 0x00000000, // Default placeholder, have no effect.
    ForceHideWindowFrameBorder            = 0x00000001, // Windows only, force hide the window frame border even on Windows 10 and onwards.
    ForceShowWindowFrameBorder            = 0x00000002, // Windows only, force show the window frame border even on Windows 7 (~ 8.1).
    DontDrawTopWindowFrameBorder          = 0x00000004, // Windows only, don't draw the top window frame border even if the window frame border is visible.
    EnableRoundedWindowCorners            = 0x00000008, // Not implemented yet.
    TransparentWindowBackground           = 0x00000010, // Not implemented yet.
    MaximizeButtonDocking                 = 0x00000020, // Windows only, enable the window docking feature introduced in Windows 11.
    UseStandardWindowLayout               = 0x00000040, // The standard window layout is a titlebar always on top and fill the window width.
    BeCompatibleWithQtFramelessWindowHint = 0x00000080, // Windows only, make the code compatible with Qt::FramelessWindowHint. Don't use this option unless you really need that flag.
    DontTouchQtInternals                  = 0x00000100, // Windows only, don't modify Qt's internal data.
    DontTouchWindowFrameBorderColor       = 0x00000200, // Windows only, don't change the window frame border color.
    DontInstallSystemMenuHook             = 0x00000400, // Windows only, don't install the system menu hook.
    DisableSystemMenu                     = 0x00000800, // Windows only, don't open the system menu when right clicks the titlebar.
    NoDoubleClickMaximizeToggle           = 0x00001000, // Don't toggle the maximize state when double clicks the titlebar.
    DisableResizing                       = 0x00002000, // Disable resizing of the window.
    DisableDragging                       = 0x00004000, // Disable dragging through the titlebar of the window.
    DontTouchCursorShape                  = 0x00008000, // Don't change the cursor shape while the mouse is hovering above the window.
    DontMoveWindowToDesktopCenter         = 0x00010000, // Don't move the window to the desktop center before shown.
    DontTreatFullScreenAsZoomed           = 0x00020000  // Don't treat fullscreen as zoomed (maximized).
};
Q_DECLARE_FLAGS(Options, Option)
Q_FLAG_NS(Options)
Q_DECLARE_OPERATORS_FOR_FLAGS(Options)

enum class SystemTheme : int
{
    Unknown = -1,
    Light = 0,
    Dark = 1,
    HighContrast = 2
};
Q_ENUM_NS(SystemTheme)

enum class SystemButtonType : int
{
    Unknown = -1,
    WindowIcon = 0,
    Help = 1,
    Minimize = 2,
    Maximize = 3,
    Restore = 4,
    Close = 5
};
Q_ENUM_NS(SystemButtonType)

enum class ResourceType : int
{
    Image = 0,
    Pixmap = 1,
    Icon = 2
};
Q_ENUM_NS(ResourceType)

enum class DwmColorizationArea : int
{
    None_ = 0, // Avoid conflict with X11 headers.
    StartMenu_TaskBar_ActionCenter = 1,
    TitleBar_WindowBorder = 2,
    All = 3
};
Q_ENUM_NS(DwmColorizationArea)

enum class Anchor : int
{
    Top = 0,
    Bottom = 1,
    Left = 2,
    Right = 3,
    HorizontalCenter = 4,
    VerticalCenter = 5,
    Center = 6
};
Q_ENUM_NS(Anchor)

using GetWindowFlagsCallback = std::function<Qt::WindowFlags()>;
using SetWindowFlagsCallback = std::function<void(const Qt::WindowFlags)>;

using GetWindowSizeCallback = std::function<QSize()>;
using SetWindowSizeCallback = std::function<void(const QSize &)>;

using GetWindowPositionCallback = std::function<QPoint()>;
using SetWindowPositionCallback = std::function<void(const QPoint &)>;

using GetWindowScreenCallback = std::function<QScreen *()>;

using IsWindowFixedSizeCallback = std::function<bool()>;
using SetWindowFixedSizeCallback = std::function<void(const bool)>;

using GetWindowStateCallback = std::function<Qt::WindowState()>;
using SetWindowStateCallback = std::function<void(const Qt::WindowState)>;

using GetWindowHandleCallback = std::function<QWindow *()>;

using WindowToScreenCallback = std::function<QPoint(const QPoint &)>;
using ScreenToWindowCallback = std::function<QPoint(const QPoint &)>;

using IsInsideSystemButtonsCallback = std::function<bool(const QPoint &, SystemButtonType *)>;
using IsInsideTitleBarDraggableAreaCallback = std::function<bool(const QPoint &)>;

using GetWindowDevicePixelRatioCallback = std::function<qreal()>;

struct UserSettings
{
    QPoint startupPosition = {};
    QSize startupSize = {};
    Qt::WindowState startupState = Qt::WindowNoState;
    Options options = {};
    QPoint systemMenuOffset = {};
    QPointer<QObject> minimizeButton = nullptr;
    QPointer<QObject> maximizeButton = nullptr;
    QPointer<QObject> closeButton = nullptr;
};

struct SystemParameters
{
    WId windowId = 0;

    GetWindowFlagsCallback getWindowFlags = nullptr;
    SetWindowFlagsCallback setWindowFlags = nullptr;

    GetWindowSizeCallback getWindowSize = nullptr;
    SetWindowSizeCallback setWindowSize = nullptr;

    GetWindowPositionCallback getWindowPosition = nullptr;
    SetWindowPositionCallback setWindowPosition = nullptr;

    GetWindowScreenCallback getWindowScreen = nullptr;

    IsWindowFixedSizeCallback isWindowFixedSize = nullptr;
    SetWindowFixedSizeCallback setWindowFixedSize = nullptr;

    GetWindowStateCallback getWindowState = nullptr;
    SetWindowStateCallback setWindowState = nullptr;

    GetWindowHandleCallback getWindowHandle = nullptr;

    WindowToScreenCallback windowToScreen = nullptr;
    ScreenToWindowCallback screenToWindow = nullptr;

    IsInsideSystemButtonsCallback isInsideSystemButtons = nullptr;
    IsInsideTitleBarDraggableAreaCallback isInsideTitleBarDraggableArea = nullptr;

    GetWindowDevicePixelRatioCallback getWindowDevicePixelRatio = nullptr;

    [[nodiscard]] inline bool isValid() const
    {
        return (windowId && getWindowFlags && setWindowFlags && getWindowSize
                && setWindowSize && getWindowPosition && setWindowPosition
                && getWindowScreen && isWindowFixedSize && setWindowFixedSize
                && getWindowState && setWindowState && getWindowHandle
                && windowToScreen && screenToWindow && isInsideSystemButtons
                && isInsideTitleBarDraggableArea && getWindowDevicePixelRatio);
    }
};

} // namespace Global

FRAMELESSHELPER_END_NAMESPACE

Q_DECLARE_METATYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(Global::UserSettings))
Q_DECLARE_METATYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(Global::SystemParameters))