#!/usr/bin/env bash
set -euo pipefail

# Toggle focus-follows-mouse in Umbriel.
#
# Umbriel has no action for this, so flip `input.focus.follows_mouse` in the
# config and ask the compositor to reload it. The config is usually a symlink
# into a dotfiles repository, so resolve it first: an in-place edit on the link
# would replace the link with a regular file.
#
# Usage: bind a compositor keybind to this script, for example:
#   "Mod+Shift+H" = "spawn:~/.bin/umbriel-focus-follows-mouse"

config="${XDG_CONFIG_HOME:-$HOME/.config}/umbriel/config.toml"

if [[ ! -f $config ]]; then
	echo "error: $config not found" >&2
	exit 1
fi

target=$(readlink -f -- "$config")
value=$(sed -n 's/^follows_mouse = \(true\|false\).*/\1/p' "$target" | head -n 1)

case "$value" in
true)
	new=false
	state="off"
	;;
false)
	new=true
	state="on"
	;;
*)
	echo "error: no follows_mouse setting in $config" >&2
	exit 1
	;;
esac

# Replace only the value so any trailing comment survives.
sed -i "s/^follows_mouse = [a-z]*/follows_mouse = $new/" "$target"

umbriel msg config-reload

# A missing shell must not fail a toggle that already applied.
if command -v noctalia >/dev/null; then
	noctalia msg notification-show "Umbriel" "Focus follows mouse: $state" || true
fi