# based on
# https://dev.openwrt.org/browser/trunk/target/linux/atheros/base-files/etc/hotplug.d/button/00-button
# https://forum.openwrt.org/viewtopic.php?pid=172110#p172110
 
. /lib/functions.sh
 
do_button () {
	local button
	local action
	local handler
	local min
	local max
 
	config_get button $1 button
	config_get action $1 action
	config_get handler $1 handler
	config_get min $1 min
	config_get max $1 max
 
 
 
	if [ "$button" = "left" -o "$button" = "middle" -o "$button" = "right" ] ; then
		# fast sliding from left to right or from right to left
		if [ "$BUTTON" = "BTN_0" -a "$ACTION" = "pressed" ] ; then
			date +%s >/tmp/b0.seconds
		fi
		if [ "$BUTTON" = "BTN_1" ] && BTN_0_pressed; then
			if [ "$ACTION" = "released" ]; then
			 [ $(expr $(date +%s) - $(cat /tmp/b0.seconds)) -gt 1 ] && export BUTTON=left
				export ACTION=pressed
			else
				export BUTTON=right
				export ACTION=pressed
			fi
		# to middle
		elif [ "$BUTTON" = "BTN_0" -a "$ACTION" = "released" ] ; then
			export BUTTON=middle
			export ACTION=pressed
		fi
	fi
	# work with button entries in /config/system: left, right, middle; wps; e.g.:
	# uci add system button; uci set system.@button[-1].button=left; uci set system.@button[-1].action=pressed
	# uci set system.@button[-1].handler=handler_script_in_usr_sbin; 
	# optional: uci set system.@button[-1].min=1; uci set system.@button[-1].max=3
	[ "$ACTION" = "$action" -a "$BUTTON" = "$button" -a -n "$handler" ] && {
		[ -z "$min" -o -z "$max" ] && eval $handler 
		[ -n "$min" -a -n "$max" ] && {
			[ $min -le $SEEN -a $max -ge $SEEN ] && eval $handler 
		}
	}
}
 
config_load system
config_foreach do_button button