#!/bin/bash

# color definitions
C_RESET=$'\e[0m'
C_GRAY=$'\e[90m'
C_CYAN=$'\e[36m'
C_BYELLOW_BOLD=$'\e[1;93m'
C_BWHITE_BOLD=$'\e[1;97m'
C_DIMYELLOW_ITALIC=$'\e[3;93m'

# logo definition
LOGO="                $C_GRAY/$C_RESET
$C_CYAN       /\\       $C_GRAY/$C_RESET
$C_CYAN      /  \\      $C_GRAY/$C_RESET
$C_CYAN     /    \\     $C_GRAY/$C_RESET
$C_CYAN    /      \\    $C_GRAY/$C_RESET
$C_CYAN   /   ,,   \\   $C_GRAY/$C_RESET
$C_CYAN  /   |  |   \\  $C_GRAY/$C_RESET
$C_CYAN /_-''    ''-_\\ $C_GRAY/$C_RESET
                $C_GRAY/$C_RESET"

# 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=(
"${C_BYELLOW_BOLD}$USER${C_BWHITE_BOLD} @ ${C_BYELLOW_BOLD}$HOSTNAME${C_RESET}"
${C_GRAY}$HORIZONTAL_SEPARATOR${C_RESET}
"${C_CYAN}CPU${C_DIMYELLOW_ITALIC} : $CPU_MODELNAME ($CPU_THREADS_NUM threads)"
"${C_CYAN}RAM${C_DIMYELLOW_ITALIC} : $RAM"
#"GPU: $GPU"
"  ${C_CYAN}${C_DIMYELLOW_ITALIC} : $UPTIME"
"  ${C_CYAN}${C_DIMYELLOW_ITALIC} : $KERNEL"
"  ${C_CYAN}${C_DIMYELLOW_ITALIC} : $WM"
"  ${C_CYAN}${C_DIMYELLOW_ITALIC} : $TERM"
"  ${C_CYAN}${C_DIMYELLOW_ITALIC} : $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[$i]}"
    printf "\n"
done
printf "${C_RESET}"