#!/bin/bash

DIR="/sys/class/backlight"

[[ "${BLOCK_INSTANCE}" == "color" ]] && MODE="color" || MODE="bw"

if [[ -d "$DIR/acpi_video0" ]]; then
   DIR="$DIR/acpi_video0"
elif [[ -d "$DIR/intel_backlight" ]]; then
   DIR="$DIR/intel_backlight"
else
   echo " no backlight "
   echo "n/a"
   exit 33
fi

cat "$DIR/brightness" "$DIR/max_brightness" | gawk -v MODE="$MODE" '
    NR==1 { current_brightness = $1 }
    NR==2 { max_brightness = $1 }
    END {
        relative_brightness = ( current_brightness / max_brightness ) * 100
        printf("%d%\n", relative_brightness)
        printf("%d\n", relative_brightness)
        if (MODE == "color") {
            if (relative_brightness < 50) {
                print("#04B431\n")
            } else if (relative_brightness < 60) {
                print("#A8FF00\n")
            } else if (relative_brightness < 70) {
                print("#FFF600\n")
            } else if (relative_brightness < 80) {
                print("#FFAE00\n")
            } else if (relative_brightness < 90) {
                print("#FF0000\n")
            } else {
                exit 33
            }
        } else {
            printf("\n")
        }
    }
'