#!/usr/bin/bash

ScrDir=$(dirname "$(realpath "$0")")
source "$ScrDir/globalcontrol.sh"

monitorInfo=$(ddcutil detect)
mapfile monitors < <(echo "$monitorInfo" | grep "I2C bus:" | cut -s -f 2 -d :)
model=$(echo "$monitorInfo" | grep "Model:" | cut -s -f 2 -d : | head -n 1 | xargs)

print_error() {
  cat <<"EOF"
    ./brightnesscontrol.sh <action>
    ...valid actions are...
        i -- <i>ncrease  brightness [+5%]
        d -- <d>ecrease  brightness [-5%]
        s -- <s>et VALUE brightness [VALUE%]
        g -- <g>et       brightness
EOF
}

get_brightness() {
  ddcutil getvcp 10 | awk -F 'current value = ' '{print $2}' | grep -o '[0-9]\+' | head -n 1
}

send_notification() {
  brightness=$(get_brightness)
  angle=$((((brightness + 2) / 5) * 5))
  ico="$HOME/.config/dunst/icons/vol/vol-${angle}.svg"

  notify-send -a "t2" -r 91190 -t 800 -i "${ico}" "Brightness ${brightness}" "${model}"
}

set_brightness() {
  for v in "${monitors[@]}"; do
    bus=$(echo "$v" | cut -s -f 2 -d -)

    case $1 in
    i)
      ddcutil setvcp 10 + "$2" --bus="$bus"
      ;;
    d)
      ddcutil setvcp 10 - "$2" --bus="$bus"
      ;;
    *)
      ddcutil setvcp 10 "$2" --bus="$bus"
      ;;
    esac
  done
}

case $1 in
i)
  currentBrightness=$(get_brightness)
  if [[ "$currentBrightness" -lt 10 ]]; then
    # Increase the brightness by 1% if less than 10%
    set_brightness i 1
  else
    # Increase the brightness by 5% otherwise
    set_brightness i 5
  fi
  send_notification
  ;;
d)
  currentBrightness=$(get_brightness)
  if [[ "$currentBrightness" -le 2 ]]; then
    # Avoid 0% brightness
    set_brightness s 2
  elif [[ "$currentBrightness" -le 10 ]]; then
    # Decrease the brightness by 1% if less than 10%
    set_brightness d 1
  else
    # Decrease the brightness by 5% otherwise
    set_brightness d 5
  fi
  send_notification
  ;;
s)
  if [[ $2 -le 2 ]]; then
    # Avoid 0% brightness
    set_brightness s 2
  else
    set_brightness s "$2"
  fi
  send_notification
  ;;
g)
  send_notification
  ;;
*)
  print_error
  ;;
esac