#!/usr/bin/env bash

STATE="${XDG_RUNTIME_DIR}/gammastep-temp"
STEP=500
MIN=1000
MAX=6500

current=$(cat "$STATE" 2>/dev/null || echo 6500)

case "$1" in
    down)
        current=$((current + STEP))
        ;;
    up)
        current=$((current - STEP))
        ;;
esac

current=$(( current < MIN ? MIN : current > MAX ? MAX : current ))

echo "$current" > "$STATE"
gammastep -m randr -x
gammastep -m randr -O "$current"