--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/gui/theme.cc	Fri Nov 03 21:32:52 2023 -0400
@@ -0,0 +1,136 @@
+#include "core/config.h"
+#include "core/session.h"
+#include <QApplication>
+#include <QFile>
+#include <QDebug>
+#include <QTextStream>
+#include <QStyleFactory>
+#ifdef MACOSX
+#	include "sys/osx/dark_theme.h"
+#else
+#	include "sys/win32/dark_theme.h"
+#endif
+
+/* This is, believe it or not, one of the hardest things I've implemented :/
+     1. Dark mode stuff in Qt changes a lot and Qt 5 and Qt 6 are massively different
+     2. Some widgets, i.e. QTabWidget, QTabBar, etc., just completely IGNORE the QPalette setting
+     3. I don't want to use the Fusion style on every single platform
+     4. Windows dark mode support in Qt 6.5 (with Fusion) is completely unavoidable
+        (not a joke btw, it's retarded)
+   These three already make it really hard, but along with that, I don't even remember if
+   OS X dark mode support even works still; I remember the background of some of the widgets
+   would refuse to update for whatever reason. */
+
+namespace Theme {
+
+Theme::Theme(Themes theme) {
+	this->theme = theme;
+}
+
+Themes Theme::GetTheme() {
+	return theme;
+}
+
+bool Theme::IsInDarkMode() {
+	if (theme != Themes::OS)
+		return (theme == Themes::DARK);
+#ifdef MACOSX
+	if (osx::DarkThemeAvailable())
+		return osx::IsInDarkTheme();
+#elif defined(WIN32)
+	if (win32::DarkThemeAvailable())
+		return win32::IsInDarkTheme();
+#endif
+	return (theme == Themes::DARK);
+}
+
+void Theme::SetToDarkTheme() {
+	/* macOS >= 10.14 has its own global dark theme,
+	   use it :) */
+#if MACOSX
+	if (osx::DarkThemeAvailable())
+		osx::SetToDarkTheme();
+	else
+#endif
+		SetStyleSheet(Themes::DARK);
+}
+
+void Theme::SetToLightTheme() {
+#if MACOSX
+	if (osx::DarkThemeAvailable())
+		osx::SetToLightTheme();
+	else
+#endif
+		SetStyleSheet(Themes::LIGHT);
+}
+
+Themes Theme::GetCurrentOSTheme() {
+#if MACOSX
+	if (osx::DarkThemeAvailable())
+		return osx::IsInDarkTheme() ? Themes::DARK : Themes::LIGHT;
+#elif defined(WIN32)
+	if (win32::DarkThemeAvailable())
+		return win32::IsInDarkTheme() ? Themes::DARK : Themes::LIGHT;
+#endif
+	/* Currently OS detection only supports Windows and macOS.
+	   Please don't be shy if you're willing to port it to other OSes
+	   (or desktop environments, or window managers) */
+	return Themes::LIGHT;
+}
+
+/* this function is private, and should stay that way */
+void Theme::SetStyleSheet(Themes theme) {
+	switch (theme) {
+		case Themes::DARK: {
+			QColor darkGray(53, 53, 53);
+			QColor gray(128, 128, 128);
+			QColor black(25, 25, 25);
+			QColor blue(42, 130, 218);
+
+			QPalette darkPalette;
+			darkPalette.setColor(QPalette::Window, darkGray);
+			darkPalette.setColor(QPalette::WindowText, Qt::white);
+			darkPalette.setColor(QPalette::Base, black);
+			darkPalette.setColor(QPalette::AlternateBase, darkGray);
+			darkPalette.setColor(QPalette::ToolTipBase, blue);
+			darkPalette.setColor(QPalette::ToolTipText, Qt::white);
+			darkPalette.setColor(QPalette::Text, Qt::white);
+			darkPalette.setColor(QPalette::Button, darkGray);
+			darkPalette.setColor(QPalette::ButtonText, Qt::white);
+			darkPalette.setColor(QPalette::Link, blue);
+			darkPalette.setColor(QPalette::Highlight, blue);
+			darkPalette.setColor(QPalette::HighlightedText, Qt::black);
+
+			darkPalette.setColor(QPalette::Active, QPalette::Button, gray.darker());
+			darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray);
+			darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray);
+			darkPalette.setColor(QPalette::Disabled, QPalette::Text, gray);
+			darkPalette.setColor(QPalette::Disabled, QPalette::Light, darkGray);
+			qApp->setPalette(darkPalette);
+			break;
+		}
+		default:
+			qApp->setPalette(QApplication::style()->standardPalette());
+			break;
+	}
+}
+
+void Theme::SetTheme(Themes theme) {
+	switch (theme) {
+		case Themes::LIGHT:
+			SetToLightTheme();
+			break;
+		case Themes::DARK:
+			SetToDarkTheme();
+			break;
+		case Themes::OS:
+			if (GetCurrentOSTheme() == Themes::LIGHT)
+				SetToLightTheme();
+			else
+				SetToDarkTheme();
+			break;
+	}
+	this->theme = theme;
+}
+
+} // namespace DarkTheme