#!/usr/bin/env bash
# Simple Waybar custom battery module using sysfs
# Outputs JSON: {"text":"...","tooltip":"..."} for Waybar's custom module

BAT_PATH="/sys/class/power_supply/BAT1"
AC_PATH="/sys/class/power_supply/ACAD"

read_file() {
  local f="$1"
  if [[ -r "$f" ]]; then
    tr -d '\n' < "$f"
  fi
}

if [[ ! -d "$BAT_PATH" ]]; then
  echo '{"text":"󱃍 N/A","tooltip":"Battery device not found (expected BAT1)"}'
  exit 0
fi

capacity="$(read_file "$BAT_PATH/capacity")"
status="$(read_file "$BAT_PATH/status")"
present="$(read_file "$BAT_PATH/present")"

# Fallbacks
capacity="${capacity:-0}"
status="${status:-Unknown}"
present="${present:-0}"

# Choose icon based on capacity
# Nerd Font icons similar to Waybar's default sequence
# 0-10, 10-20, ... , 90-100
icons=( "󰂎" "󰁺" "󰁻" "󰁼" "󰁽" "󰁾" "󰁿" "󰂀" "󰂁" "󰂂" "󰁹" )

idx=$(( capacity / 10 ))
if (( idx < 0 )); then idx=0; fi
if (( idx > 10 )); then idx=10; fi

icon="${icons[$idx]}"

# If charging, override icon with plug
if [[ "$status" == "Charging" || "$status" == "Full" ]]; then
  icon=""
fi

# AC online?
ac_online=""
if [[ -r "$AC_PATH/online" ]]; then
  ac_online="$(read_file "$AC_PATH/online")"
fi

# Build tooltip details
tooltip="Status: ${status}"
tooltip+="\nCapacity: ${capacity}%"
if [[ -n "$ac_online" ]]; then
  tooltip+="\nAC Online: ${ac_online}"
fi

# If battery is reported not present, show N/A
if [[ "$present" != "1" ]]; then
  echo '{"text":"󱃍 N/A","tooltip":"Battery not present"}'
  exit 0
fi

# Emit JSON for Waybar
printf '{"text":"%s %s%%","tooltip":"%s"}\n' "$icon" "$capacity" "$tooltip"