#!/bin/bash
sync_theme() {
	# Get the current system theme
	theme=$(xfconf-query -c xsettings -p /Net/ThemeName)
	# Find the best match for the xfwm4 theme that corresponds with the current system theme
	xfwm4_theme=$(find /usr/share/themes/ /usr/local/share/themes/ "$HOME"/.themes/ "$HOME"/.local/share/themes/ -mindepth 2 -maxdepth 2 -type d -name xfwm4 -printf '%h\n' 2>/dev/null | grep -o "/${theme}[^/]*$" | sort | head -n1)
	# If a match is not found then use the Default theme
	[ -z "$xfwm4_theme" ] && xfwm4_theme='Default'
	# Apply the xfwm4 theme
	xfconf-query -c xfwm4 -p /general/theme -n -t string -s "${xfwm4_theme#/}"
	# Apply the current theme with gsettings
	gsettings set org.gnome.desktop.interface gtk-theme "$theme"
}

setvalue() {
	grep -qz "^\[Appearance\][^\[]*$1=$2" "$file" && return
	if grep -qz "^\[Appearance\][^\[]*$1=" "$file"; then
		sed -i "/\[Appearance\]/,/^\s*$1=/{s/^\s*$1=.*$/$1=$2/}" "$file"
	else
		sed -i "/\[Appearance\]/a $1=$2" "$file"
	fi
}

sync_icon_theme() {
	# Get the current icon theme
	icon_theme=$(xfconf-query -c xsettings -p /Net/IconThemeName)
	# Apply the same theme in qt5ct and qt6ct configuration
	for file in "$HOME"/.config/qt5ct/qt5ct.conf "$HOME"/.config/qt6ct/qt6ct.conf; do
		# Create the config directory
		dir=$(dirname "$file")
		mkdir -p "$dir" || { echo "failed to make directory $dir"; continue; }
		# Create the config file appropriately
		if grep -q '^\[Appearance\]' "$file"; then
			setvalue 'icon_theme' "$icon_theme"
			setvalue 'style' 'gtk2'
		elif grep -q '\S' "$file"; then
			tail -n1 "$file" | grep -qx '\s*' && begin='' || begin='\n'
			printf '%b[Appearance]\nicon_theme=%s\nstyle=gtk2\n' "$begin" "$icon_theme" >> "$file"
		else
			printf '[Appearance]\nicon_theme=%s\nstyle=gtk2\n' "$icon_theme" > "$file"
		fi
	done
}

sync_font() {
	# Get the current system font
	font=$(xfconf-query -c xsettings -p /Gtk/FontName)
	# Apply the same font for the title of xfce windows
	xfconf-query -c xfwm4 -p /general/title_font -n -t string -s "$font"
}

sync_theme
sync_icon_theme
sync_font

while read -r line; do
	case "$line" in
		'set: /Net/ThemeName') sync_theme ;;
		'set: /Net/IconThemeName') sync_icon_theme ;;
		'set: /Gtk/FontName') sync_font ;;
	esac
done < <(xfconf-query -c xsettings -m)