#!/bin/bash

# logo definition
LOGO="                |
       /\\       |
      /  \\      |
     /    \\     |
    /      \\    |
   /   ,,   \\   |
  /   |  |   \\  |
 /_-''    ''-_\\ |
                |"

# all the info fields
USER=$USER
HOSTNAME=$(cat /etc/hostname)
#CPU_MODELNAME=$(cat /proc/cpuinfo | awk '/model name\t:/' | awk -F ": " '{print $2}' | head -1)
CPU_MODELNAME="Intel Core i5-8365U"
CPU_THREADS_NUM=$(nproc)
RAM_FREE=$(awk '/MemFree:/ { printf "%.1f\n", $2 / 1000000 }' /proc/meminfo)
RAM_TOTAL=$(awk '/MemTotal:/ { printf "%.1f\n", $2 / 1000000 }' /proc/meminfo)
RAM="${RAM_FREE}G / ${RAM_TOTAL}G"
#GPU=$(cat /sys/class/drm/card1/device/{vendor,device} | tr '\n' ':' | head -c -1)
#GPU="Intel(R) UHD Graphics 620"
UPTIME=$(awk '{ s=int($1); printf "%dd %dh %dm\n", s/86400, (s%86400)/3600, (s%3600)/60 }' /proc/uptime)
KERNEL=$(uname -r)
WM="dwm"
TERM=$TERM
SHELL=$SHELL


horizontal_n=$((${#USER} + ${#HOSTNAME} + 3))
horizontal_separator_char="-"
HORIZONTAL_SEPARATOR=$(printf '%*s' "$horizontal_n" ' ' | tr ' ' "$horizontal_separator_char")

# -----
# output login

# convert the logo into an array of "lines" (strings)
mapfile -t LOGO_LINES <<< "$LOGO"

# array of strings as well for the info fields
INFO_LINES=(
"$USER @ $HOSTNAME"
$HORIZONTAL_SEPARATOR
"CPU    : $CPU_MODELNAME ($CPU_THREADS_NUM threads)"
"RAM    : $RAM"
#"GPU: $GPU"
"      : $UPTIME"
"      : $KERNEL"
"      : $WM"
"      : $TERM"
"      : $SHELL"
)

for i in "${!LOGO_LINES[@]}"; do
    # 15 chars is the length of the logo
    printf "%-15s" "${LOGO_LINES[$i]}"
    # only print info if it exists for this line
    [ $i -lt ${#INFO_LINES[@]} ] && printf " %s" "${INFO_LINES[$i]}"
    printf "\n"
done