#!/bin/sh

# TODO add the option error checking with optind


err() {
	echo "${0}": "${1}"
	exit 1
}


help() {
cat << EOF
$0: Wrapper script to set wallpapers

options:
 -d [File]	Select a wallpaper or a directory
 -h 		Print this message and exit
 -c 		Remove the current wallpaper

NOTE: default wallpaper directory is ~/.config/wallpapers
EOF
}

waldir="${HOME}"/.config/wallpapers
# FIXME add xdg home variable

while getopts "hcd:" option; do
	case "${option}" in
	h)
		help
		exit 0
	;;
	c)
		xwallpaper --clear > /dev/null 2>&1 \
		|| err "Couldn't clear wallpaper"
		exit 0
	;;
	d) buf="${OPTARG}" ;;
	*) err 'add -h for help' ;;
	esac
done


if [ -n "${buf}" ]; then
	case $(file -b --mime-type "${buf}") in
	image/*) image="${buf}" ;;
	inode/directory) waldir="${buf}" ;;
	*) err "Couldn't read given file" ;;
	esac
fi

if [ -z "${image}" ]; then
	image=$(find "${waldir}" -iregex '.*\.jpeg\|.*\.jpng\|.*\.png' 2>/dev/null \
	| shuf -n 1 2>/dev/null)
fi

xwallpaper --zoom "${image}" > /dev/null 2>&1 || err "Couldn't set wallpaper"

echo "${image}"