#!/bin/bash

DIR="/sys/class/power_supply"

if [[ "$BLOCK_INSTANCE" == "" ]]; then
    for BAT in $DIR/BAT*/; do
        [[ -f "${BAT}uevent" ]] && BATS+="$BAT/uevent "
    done
else
    [[ -f "$DIR/BAT$BLOCK_INSTANCE/uevent" ]] && BATS="$DIR/BAT$BLOCK_INSTANCE/uevent"    
fi

if [[ "${BATS}" == "" ]]; then
    echo " no battery "
    echo "n/a"
    exit 33
fi

cat $BATS | gawk -F '=' '
    BEGIN {
        efull = 0
        enow = 0
        status = ""
    } 
    /POWER_SUPPLY_STATUS=/ {
        if (status == "") {
            status = $2
            if (status == "Discharging") {
                status = "↓"
            } else if (status == "Charging") {
                status = "⚡"
            } else {
                status = ""
            }
        }
    }
    /POWER_SUPPLY_ENERGY_FULL=/ {
        efull += $2
    }
    /POWER_SUPPLY_ENERGY_NOW=/ {
        enow += $2
    }
    END {
        charge = enow / efull * 100
        printf("%s%d%\n", status, charge)
        printf("%s%d\n", status, charge)
        if (charge > 25) {
            print("#04B431\n")
        } else if (charge > 20) {
            print("#A8FF00\n")
        } else if (charge > 15) {
            print("#FFF600\n")
        } else if (charge > 10) {
            print("#FFAE00\n")
        } else if (charge > 5) {
            print("#FF0000\n")
        } else {
            exit 33
        }
    }
'