#!/data/data/com.termux/files/usr/bin/bash

set -e

SCRIPTNAME=termux-wallpaper

show_usage () {
	echo "Change wallpaper on your device"
	echo
	echo "Usage: $SCRIPTNAME cmd [args]"
	echo "-h         show this help"
	echo "-f <file>  set wallpaper from file"
	echo "-u <url>   set wallpaper from url resource"
	echo "-l         set wallpaper for lockscreen (Nougat and later)"
	exit 1
}

call_api() {
	/data/data/com.termux/files/usr/libexec/termux-api Wallpaper "$@"
}

usage_error () {
	echo "ERROR: $@"
	show_usage
}

LOCKSCREEN_FLAG=1
RESOURCE_FLAG=2

FLAGS=0

set_single () {
	if [ $((FLAGS & $1)) -ne 0 ]; then
		usage_error "Option already set"
	fi
	FLAGS=$((FLAGS | $1))
	PARAMS="$PARAMS $2"
}

set_resource () {
	if [ $((FLAGS & $RESOURCE_FLAG)) -ne 0 ]; then
		usage_error "More than one image resource specified!"
	fi
	set_single $RESOURCE_FLAG "$1"
}

set_file () {
	if [ ! -f $1 ]; then
		usage_error "'$1' is not a file!"
	fi
	set_resource "--es file "$(realpath $1)""
}

while getopts :h,:l,f:,u: option
do
	case "$option" in
		h) show_usage ;;
		l) set_single $LOCKSCREEN_FLAG "--ez lockscreen true" ;;
		f) set_file $OPTARG ;;
		u) set_resource "--es url $OPTARG" ;;
		?) echo "$SCRIPTNAME: illegal option -$OPTARG"; exit 1 ;;
	esac
done

shift $((OPTIND - 1))

if [ $((FLAGS & RESOURCE_FLAG)) -eq 0 ]; then
	usage_error "No file or url provided!"
fi

call_api $PARAMS