#!/bin/bash

# Exit out if the same script is already running in the background
pidof -sq -o %PPID -x "$(basename "$0")" && exit

# Set the directory paths
flatpak_themes_dir="$HOME/.themes"
flatpak_icons_dir="$HOME/.icons"

# Create flatpak icons & themes directories if they don't exist
mkdir -p "$flatpak_themes_dir" "$flatpak_icons_dir" ||
	{ echo "failed to make directories $flatpak_themes_dir & $flatpak_icons_dir"; exit 1; }

sync_theme() {
	# Get the current system theme
	current_theme=$(xfconf-query -c xsettings -p /Net/ThemeName)

	# Enable syncing the current theme with xfwm4 theme if not already enabled
	[ "$(xfconf-query -c xsettings -p /Xfce/SyncThemes)" != 'true' ] && xfconf-query -c xsettings -p /Xfce/SyncThemes -n -t bool -s true
	# Apply the current theme with gsettings
	gsettings set org.gnome.desktop.interface gtk-theme "$current_theme"
	# Apply the current theme for GTK and Libadwaita apps on flatpak
	flatpak override --user --env=GTK_THEME="$current_theme"


	# Cleanup flatpak_themes_dir
	rm -rf "${flatpak_themes_dir:?}"/*

	# Go through each item in $XDG_DATA_DIRS to find the directory where
	# the current theme is stored, and copy/sync them to flatpak_themes_dir
	while read -r dir; do
		current_theme_dir=${dir%/}/themes/${current_theme}
		if [ -d "$current_theme_dir" ]; then
			rsync -av --delete --progress "$current_theme_dir" "$flatpak_themes_dir"
			break
		fi
	done < <(printf '%s:%s\n' "$HOME/.local/share" "$XDG_DATA_DIRS" | tr ':' '\n')
}

sync_icons() {
	# Get the current icon theme
	current_icon_theme=$(xfconf-query -c xsettings -p /Net/IconThemeName)

	# Cleanup flatpak_icons_dir
	rm -rf "${flatpak_icons_dir:?}"/*

	# Go through each item in $XDG_DATA_DIRS to find the directory where
	# the current icon theme is stored, and copy/sync them to flatpak_icons_dir
	while read -r dir; do
		current_icon_theme_dir=${dir%/}/icons/${current_icon_theme}
		if [ -d "$current_icon_theme_dir" ]; then
			rsync -av --delete --progress "$current_icon_theme_dir" "$flatpak_icons_dir"
			break
		fi
	done < <(printf '%s:%s\n' "$HOME/.local/share" "$XDG_DATA_DIRS" | tr ':' '\n')
}

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"
}

# Initial synchronization
sync_theme
sync_icons
sync_font

# Monitor when the user changes their system theme or icons or font in XFCE and sync them as needed
while read -r line; do
	case "$line" in
		'set: /Net/ThemeName') sync_theme ;;
		'set: /Net/IconThemeName') sync_icons ;;
		'set: /Gtk/FontName') sync_font ;;
	esac
done < <(xfconf-query -c xsettings -m)