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****************************************************************************/

#include "qcocoasystemsettings.h"

#include "qcocoahelpers.h"

#include <QtCore/private/qcore_mac_p.h>
#include <QtGui/qfont.h>
#include <QtGui/private/qcoregraphics_p.h>

#if !QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(__MAC_10_14)
@interface NSColor (MojaveForwardDeclarations)
@property (class, strong, readonly) NSColor *selectedContentBackgroundColor NS_AVAILABLE_MAC(10_14);
@property (class, strong, readonly) NSColor *unemphasizedSelectedTextBackgroundColor NS_AVAILABLE_MAC(10_14);
@property (class, strong, readonly) NSColor *unemphasizedSelectedTextColor NS_AVAILABLE_MAC(10_14);
@property (class, strong, readonly) NSColor *unemphasizedSelectedContentBackgroundColor NS_AVAILABLE_MAC(10_14);
@property (class, strong, readonly) NSArray<NSColor *> *alternatingContentBackgroundColors NS_AVAILABLE_MAC(10_14);
// Missing from non-Mojave SDKs, even if introduced in 10.10
@property (class, strong, readonly) NSColor *linkColor NS_AVAILABLE_MAC(10_10);
@end
#endif

QT_BEGIN_NAMESPACE

QPalette * qt_mac_createSystemPalette()
{
    QColor qc;

    // Standard palette initialization (copied from Qt 4 styles)
    QBrush backgroundBrush = qt_mac_toQBrush([NSColor windowBackgroundColor]);
    QColor background = backgroundBrush.color();
    QColor light(background.lighter(110));
    QColor dark(background.darker(160));
    QColor mid(background.darker(140));
    QPalette *palette = new QPalette(Qt::black, background, light, dark, mid, Qt::black, Qt::white);

    palette->setBrush(QPalette::Window, backgroundBrush);

    palette->setBrush(QPalette::Disabled, QPalette::WindowText, dark);
    palette->setBrush(QPalette::Disabled, QPalette::Text, dark);
    palette->setBrush(QPalette::Disabled, QPalette::ButtonText, dark);
    palette->setBrush(QPalette::Disabled, QPalette::Base, backgroundBrush);
    QBrush textBackgroundBrush = qt_mac_toQBrush([NSColor textBackgroundColor]);
    palette->setBrush(QPalette::Active, QPalette::Base, textBackgroundBrush);
    palette->setBrush(QPalette::Inactive, QPalette::Base, textBackgroundBrush);
    palette->setColor(QPalette::Disabled, QPalette::Dark, QColor(191, 191, 191));
    palette->setColor(QPalette::Active, QPalette::Dark, QColor(191, 191, 191));
    palette->setColor(QPalette::Inactive, QPalette::Dark, QColor(191, 191, 191));

    // System palette initialization:
    QBrush br = qt_mac_toQBrush([NSColor selectedControlColor]);
    palette->setBrush(QPalette::Active, QPalette::Highlight, br);
    if (__builtin_available(macOS 10.14, *)) {
        const auto inactiveHighlight = qt_mac_toQBrush([NSColor unemphasizedSelectedContentBackgroundColor]);
        palette->setBrush(QPalette::Inactive, QPalette::Highlight, inactiveHighlight);
        palette->setBrush(QPalette::Disabled, QPalette::Highlight, inactiveHighlight);
    } else {
        palette->setBrush(QPalette::Inactive, QPalette::Highlight, br);
        palette->setBrush(QPalette::Disabled, QPalette::Highlight, br);
    }

    palette->setBrush(QPalette::Shadow, qt_mac_toQColor([NSColor shadowColor]));

    qc = qt_mac_toQColor([NSColor controlTextColor]);
    palette->setColor(QPalette::Active, QPalette::Text, qc);
    palette->setColor(QPalette::Active, QPalette::WindowText, qc);
    palette->setColor(QPalette::Active, QPalette::HighlightedText, qc);
    palette->setColor(QPalette::Inactive, QPalette::Text, qc);
    palette->setColor(QPalette::Inactive, QPalette::WindowText, qc);
    palette->setColor(QPalette::Inactive, QPalette::HighlightedText, qc);

    qc = qt_mac_toQColor([NSColor disabledControlTextColor]);
    palette->setColor(QPalette::Disabled, QPalette::Text, qc);
    palette->setColor(QPalette::Disabled, QPalette::WindowText, qc);
    palette->setColor(QPalette::Disabled, QPalette::HighlightedText, qc);

    palette->setBrush(QPalette::ToolTipBase, qt_mac_toQBrush([NSColor controlColor]));

    palette->setColor(QPalette::Normal, QPalette::Link, qt_mac_toQColor([NSColor linkColor]));

    return palette;
}

struct QMacPaletteMap {
    inline QMacPaletteMap(QPlatformTheme::Palette p, NSColor *a, NSColor *i) :
        active(a), inactive(i), paletteRole(p) { }

    NSColor *active;
    NSColor *inactive;
    QPlatformTheme::Palette paletteRole;
};

#define MAC_PALETTE_ENTRY(pal, active, inactive) \
    QMacPaletteMap(pal, [NSColor active], [NSColor inactive])
static QMacPaletteMap mac_widget_colors[] = {
    MAC_PALETTE_ENTRY(QPlatformTheme::ToolButtonPalette, controlTextColor, disabledControlTextColor),
    MAC_PALETTE_ENTRY(QPlatformTheme::ButtonPalette, controlTextColor, disabledControlTextColor),
    MAC_PALETTE_ENTRY(QPlatformTheme::HeaderPalette, headerTextColor, disabledControlTextColor),
    MAC_PALETTE_ENTRY(QPlatformTheme::ComboBoxPalette, controlTextColor, disabledControlTextColor),
    MAC_PALETTE_ENTRY(QPlatformTheme::ItemViewPalette, textColor, disabledControlTextColor),
    MAC_PALETTE_ENTRY(QPlatformTheme::MessageBoxLabelPalette, textColor, disabledControlTextColor),
    MAC_PALETTE_ENTRY(QPlatformTheme::TabBarPalette, controlTextColor, disabledControlTextColor),
    MAC_PALETTE_ENTRY(QPlatformTheme::LabelPalette, textColor, disabledControlTextColor),
    MAC_PALETTE_ENTRY(QPlatformTheme::GroupBoxPalette, textColor, disabledControlTextColor),
    MAC_PALETTE_ENTRY(QPlatformTheme::MenuPalette, controlTextColor, disabledControlTextColor),
    MAC_PALETTE_ENTRY(QPlatformTheme::MenuBarPalette, controlTextColor, disabledControlTextColor),
    MAC_PALETTE_ENTRY(QPlatformTheme::TextEditPalette, textColor, disabledControlTextColor),
    MAC_PALETTE_ENTRY(QPlatformTheme::TextLineEditPalette, textColor, disabledControlTextColor)
};
#undef MAC_PALETTE_ENTRY

static const int mac_widget_colors_count = sizeof(mac_widget_colors) / sizeof(mac_widget_colors[0]);

QHash<QPlatformTheme::Palette, QPalette*> qt_mac_createRolePalettes()
{
    QHash<QPlatformTheme::Palette, QPalette*> palettes;
    QColor qc;
    for (int i = 0; i < mac_widget_colors_count; i++) {
        QPalette &pal = *qt_mac_createSystemPalette();
        if (mac_widget_colors[i].active) {
            qc = qt_mac_toQColor(mac_widget_colors[i].active);
            pal.setColor(QPalette::Active, QPalette::Text, qc);
            pal.setColor(QPalette::Inactive, QPalette::Text, qc);
            pal.setColor(QPalette::Active, QPalette::WindowText, qc);
            pal.setColor(QPalette::Inactive, QPalette::WindowText, qc);
            pal.setColor(QPalette::Active, QPalette::HighlightedText, qc);
            pal.setColor(QPalette::Inactive, QPalette::HighlightedText, qc);
            pal.setColor(QPalette::Active, QPalette::ButtonText, qc);
            pal.setColor(QPalette::Inactive, QPalette::ButtonText, qc);
            qc = qt_mac_toQColor(mac_widget_colors[i].inactive);
            pal.setColor(QPalette::Disabled, QPalette::Text, qc);
            pal.setColor(QPalette::Disabled, QPalette::WindowText, qc);
            pal.setColor(QPalette::Disabled, QPalette::HighlightedText, qc);
            pal.setColor(QPalette::Disabled, QPalette::ButtonText, qc);
        }
        if (mac_widget_colors[i].paletteRole == QPlatformTheme::MenuPalette
                || mac_widget_colors[i].paletteRole == QPlatformTheme::MenuBarPalette) {
            NSColor *selectedMenuItemColor = nil;
            if (__builtin_available(macOS 10.14, *)) {
                // Cheap approximation for NSVisualEffectView (see deprecation note for selectedMenuItemTextColor)
                selectedMenuItemColor = [[NSColor selectedContentBackgroundColor] highlightWithLevel:0.4];
            } else {
                // selectedMenuItemColor would presumably be the correct color to use as the background
                // for selected menu items. But that color is always blue, and doesn't follow the
                // appearance color in system preferences. So we therefore deliberatly choose to use
                // keyboardFocusIndicatorColor instead, which appears to have the same color value.
                selectedMenuItemColor = [NSColor keyboardFocusIndicatorColor];
            }
            pal.setBrush(QPalette::Highlight, qt_mac_toQColor(selectedMenuItemColor));
            qc = qt_mac_toQColor([NSColor labelColor]);
            pal.setBrush(QPalette::ButtonText, qc);
            pal.setBrush(QPalette::Text, qc);
            qc = qt_mac_toQColor([NSColor selectedMenuItemTextColor]);
            pal.setBrush(QPalette::HighlightedText, qc);
            qc = qt_mac_toQColor([NSColor disabledControlTextColor]);
            pal.setBrush(QPalette::Disabled, QPalette::Text, qc);
        } else if ((mac_widget_colors[i].paletteRole == QPlatformTheme::ButtonPalette)
                || (mac_widget_colors[i].paletteRole == QPlatformTheme::HeaderPalette)
                || (mac_widget_colors[i].paletteRole == QPlatformTheme::TabBarPalette)) {
            pal.setColor(QPalette::Disabled, QPalette::ButtonText,
                         pal.color(QPalette::Disabled, QPalette::Text));
            pal.setColor(QPalette::Inactive, QPalette::ButtonText,
                         pal.color(QPalette::Inactive, QPalette::Text));
            pal.setColor(QPalette::Active, QPalette::ButtonText,
                         pal.color(QPalette::Active, QPalette::Text));
        } else if (mac_widget_colors[i].paletteRole == QPlatformTheme::ItemViewPalette) {
            NSArray<NSColor *> *baseColors = nil;
            NSColor *activeHighlightColor = nil;
            if (__builtin_available(macOS 10.14, *)) {
                baseColors = [NSColor alternatingContentBackgroundColors];
                activeHighlightColor = [NSColor selectedContentBackgroundColor];
                pal.setBrush(QPalette::Inactive, QPalette::HighlightedText,
                             qt_mac_toQBrush([NSColor unemphasizedSelectedTextColor]));
            } else {
                baseColors = [NSColor controlAlternatingRowBackgroundColors];
                activeHighlightColor = [NSColor alternateSelectedControlColor];
                pal.setBrush(QPalette::Inactive, QPalette::HighlightedText,
                             pal.brush(QPalette::Active, QPalette::Text));
            }
            pal.setBrush(QPalette::Base, qt_mac_toQBrush(baseColors[0]));
            pal.setBrush(QPalette::AlternateBase, qt_mac_toQBrush(baseColors[1]));
            pal.setBrush(QPalette::Active, QPalette::Highlight,
                         qt_mac_toQBrush(activeHighlightColor));
            pal.setBrush(QPalette::Active, QPalette::HighlightedText,
                         qt_mac_toQBrush([NSColor alternateSelectedControlTextColor]));
            pal.setBrush(QPalette::Inactive, QPalette::Text,
                         pal.brush(QPalette::Active, QPalette::Text));
        } else if (mac_widget_colors[i].paletteRole == QPlatformTheme::TextEditPalette) {
            pal.setBrush(QPalette::Active, QPalette::Base, qt_mac_toQColor([NSColor textBackgroundColor]));
            pal.setBrush(QPalette::Inactive, QPalette::Text,
                          pal.brush(QPalette::Active, QPalette::Text));
            pal.setBrush(QPalette::Inactive, QPalette::HighlightedText,
                          pal.brush(QPalette::Active, QPalette::Text));
        } else if (mac_widget_colors[i].paletteRole == QPlatformTheme::TextLineEditPalette
                   || mac_widget_colors[i].paletteRole == QPlatformTheme::ComboBoxPalette) {
            pal.setBrush(QPalette::Active, QPalette::Base, qt_mac_toQColor([NSColor textBackgroundColor]));
            pal.setBrush(QPalette::Disabled, QPalette::Base,
                         pal.brush(QPalette::Active, QPalette::Base));
        } else if (mac_widget_colors[i].paletteRole == QPlatformTheme::LabelPalette) {
            qc = qt_mac_toQColor([NSColor labelColor]);
            pal.setBrush(QPalette::Inactive, QPalette::ToolTipText, qc);
        }
        palettes.insert(mac_widget_colors[i].paletteRole, &pal);
    }
    return palettes;
}

QT_END_NAMESPACE