#!/bin/bash
trap \
    "{ pkill -P $$ ; exit 255; }" \
    SIGINT SIGTERM ERR EXIT

bat() {
    battery=$(cat /sys/class/power_supply/BAT0/capacity)
    time=$(cat /tmp/.battime)
    drain=$(cat /sys/class/power_supply/BAT0/power_now)
    if [[ $(cat /sys/class/power_supply/BAT0/status) == "Charging" ]]; then
        echo "$battery%+"
    else
        echo "$time, $battery%$charge, $(echo "scale=1; $drain / 1000000" | bc)mW"
    fi
}

time_date() {
    FORMAT="%a %m.%d.%y %T"
    DATE=`date "+${FORMAT}"`
    echo "${DATE}"
}

mem() {
    echo "scale=2; $(free -m | sed -n 2p | awk '{print $3 + $5}') / 1000" | bc
}

vol() {
    MUTED=$(amixer get Master | grep off)
    amixer get Master | grep -m1 -Po "\d{1,3}%"
    [[ $MUTED != '' ]] && echo " M";

}

temp_update() {
    TEMP=$(cat /sys/class/thermal/thermal_zone0/temp)
    echo $((TEMP / 1000)) 
}

cpu_update() {
    read prevtotal previdle < /tmp/.cpulast
    read cpu a b c idle rest < /proc/stat
    total=$((a+b+c+idle))
    [[ $prevtotal == 0 ]] && prevtotal=1
    cpu=$((100*( (total-prevtotal) - (idle-previdle) ) / (total-prevtotal) ))
    echo $total $idle > /tmp/.cpulast
    echo "$cpu%" 
}

calc(){ awk "BEGIN { print "$*" }"; }
mhz_update() {
    mhz=$(cat /proc/cpuinfo | grep 'cpu MHz' | awk '{print $4}' | head -n1 | cut -d "." -f 1)
    echo "$(calc $mhz/1000 | awk '{ printf "%1.2f\n", $0 }') GHz" 
}

update_3() {
    while true; do
        cpu_update > /tmp/.cpu
        temp_update > /tmp/.temp
        mhz_update > /tmp/.mhz
        sleep 3
    done
}
update_30() {
    while :; do
        awk 'NR==3 {printf("%.0ddB",$4) > "/tmp/.wifi"}' /proc/net/wireless
        acpi | awk '{print $5}' > /tmp/.battime
        if ping -W 1 -c 1 8.8.8.8 > /dev/null; then
            echo "@" > /tmp/.online
        else
            echo "?" > /tmp/.online
        fi
        sleep 30
    done
}

update_300() {
    while :; do
        curl -s wttr.in/madison?format=%t | head -c 7 > /tmp/.wttr
        sleep 300
    done
}

SLEEP_SEC=1
PAD=" | "
update_300 &
update_30 &
update_3 &
while true; do
    xsetroot -name "$(mem)G$PAD$(cat /tmp/.cpu)$PAD$(cat /tmp/.mhz)$PAD$(cat /tmp/.temp)°C$PAD$(cat /tmp/.wifi), $(cat /tmp/.online)$PAD$(vol)$PAD$(bat)$PAD$(cat /tmp/.wttr), $(time_date)"
    sleep $SLEEP_SEC
done