#!/bin/sh

LOG="/tmp/lid-handler.log"
SAVED_BRIGHTNESS_FILE="/tmp/keyboard_backlight_saved"
BACKLIGHT_NAME="system76_acpi::kbd_backlight"
LID_PATH=$(find /proc/acpi/button/lid/ -name state | head -n1)

# Check if the lid path exists
if [[ -z "$LID_PATH" ]] || [[ ! -f "$LID_PATH" ]]; then
  echo "$(date): ERROR - Lid state file not found." >> "$LOG"
  exit 1
fi

# Watch for lid events
last_state="unknown"

while true; do
  # Wait for lid state to change
  inotifywait -e modify "$LID_PATH" >/dev/null 2>&1

  state=$(grep -o 'open\|closed' "$LID_PATH")

  # Log only when lid is opened or closed
  if [[ "$state" != "$last_state" ]]; then
    if [[ "$state" == "closed" ]]; then
      # Save brightness and suspend when lid is closed
      brightnessctl --device="$BACKLIGHT_NAME" get > "$SAVED_BRIGHTNESS_FILE"
      brightnessctl --device="$BACKLIGHT_NAME" set 0
      echo "$(date): Lid closed. Backlight saved and system suspending..." >> "$LOG"
      systemctl suspend

    elif [[ "$state" == "open" ]]; then
      # Restore brightness when lid is opened
      if [[ -f "$SAVED_BRIGHTNESS_FILE" ]]; then
        BRIGHTNESS=$(cat "$SAVED_BRIGHTNESS_FILE")
        brightnessctl --device="$BACKLIGHT_NAME" set "$BRIGHTNESS"
        echo "$(date): Lid opened. Backlight restored." >> "$LOG"
      fi
    fi

    last_state="$state"
  fi
done