#!/bin/bash

function scrypto() {
    local c

    c="$(crypto 2> /dev/null)" && echo "$c" > crypto
}

function scpu() {
    echo " $(awk '{print $1}' /proc/loadavg)" > cpu
}

function smemory() {
    echo " $(free -h | awk '/^Mem:/{print $3}')" > memory
}

function sbat() {
    local cap; cap="$(cat /sys/class/power_supply/BAT0/capacity)"

    if grep -qv Discharging /sys/class/power_supply/BAT0/status; then
        echo " $cap%"
    else
        echo " $cap%"
    fi > bat
}

function svol() {
    local st v vol=('' ' ') mut=('🔇' ' ') m

    mapfile -t st <<< "$(wpctl status | sed -n 's/.*\*.*\[vol: \(.*\)]/\1/p')"
    if [ -z "${st[0]}" ]; then
        return > vol
    fi
    for i in "${!vol[@]}"; do
        read -r v m <<< "${st[$i]}"
        if [ -n "$m" ]; then
            echo -n "${mut[$i]}"
        else
            echo -n "${vol[$i]} $((10#${v/./}))"
        fi
    done > vol
}

function snet() {
    local dev j ssid sig

    dev="$(ip route | grep -oP 'default.*dev\s+\K[^\s]+')"
    j="$(networkctl status "$dev" --json=short)"
    case "$(jq -r .Type <<< "$j")" in
        ether)
            echo "🌐 $dev"
            ;;
        wlan)
            ssid="$(jq -r .SSID <<< "$j")"
            sig="$(awk "/$dev/{printf \"%.0f\", \$3}" /proc/net/wireless)"
            if   [ "$sig" -gt 56 ]; then echo "▂▄▆█ $ssid"
            elif [ "$sig" -gt 38 ]; then echo "▂▄▆_ $ssid"
            elif [ "$sig" -gt 21 ]; then echo "▂▄__ $ssid"
            elif [ "$sig" -gt  3 ]; then echo "▂___ $ssid"
            else                         echo "____ $ssid"
            fi
            ;;
        *)
            echo '⚠'
            ;;
    esac > net
}

function svpn() {
    local v; v="$(ip -br link show type wireguard | awk '{print $1}')"

    if [ -n "$v" ]; then
        echo " 🔒 $v"
    fi > vpn
}

function stime() {
    # shellcheck disable=SC2238
    TZ=Asia/Makassar date '+%a %m-%d %R %Z' > time
}

function display() {
    for f in *; do
        local - "$f"="$(cat "$f")"
    done
    # shellcheck disable=SC2128,SC2154
    xsetroot -name "$crypto | $cpu | $memory | $vol | $net$vpn | $bat | $time"
}

# SIGNALING
# trap  '<function>;display;wait' 'RTMIN+n'
trap    'svol;display;wait'       'RTMIN+0'
trap    'snet;display;wait'       'RTMIN+1'
trap    'svpn;display;wait'       'RTMIN+2'
# to update it from external commands
## kill -m "$(cat "$XDG_CACHE_HOME/pidofbar")"
# where m = 34 + n

mkdir -p "$XDG_RUNTIME_DIR/sbar" && cd "$XDG_RUNTIME_DIR/sbar" || exit 1
echo "$$" > pid

(while :; do
    scrypto
    sleep $((300 - 10#$(date '+%S') % 300)) & wait
done &)

while true; do
    scpu
    smemory
    svol
    snet
    svpn
    sbat
    stime
    display
    sleep $((5 - 10#$(date '+%S') % 5)) & wait
done