#!/usr/bin/env bash
#
# display a custom decorative text (default to username)
# + welcome the username + date, time and timezone
# + inform of mail presence for user (if s-nail is installed)
#
# requirements: sudo apt install figlet
#               sudo wget --no-check-certificate -O "/usr/share/figlet/ansi-shadow.flf" https://raw.githubusercontent.com/xero/figlet-fonts/master/ANSI%20Shadow.flf
# optionnal:    sudo apt install s-nail

# GENERAL ###########################################################

# locale env
unset LC_ALL
export LC_MESSAGES=C

# check if module was disabled
module_disable=${module_header_disable:=0}
if (($module_disable == 1)); then
    exit 1
fi

# colors
c_txt=${c_txt:="39"}
c_txt_emphase=${c_txt_emphase:="35"}
c_txt_deco=${c_txt_deco:="97"}
c_txt_invert=${c_txt_invert:="30"}
c_bg=${c_bg_sec:="47"}
c_danger=${c_danger:="31"}
c_warning=${c_warning:="33"}
c_success=${c_success:="32"}
c_title=${c_title:="${c_bg};1;${c_txt_invert}m"}

# OPTIONS ###########################################################

# banner custom text or username
username=$(/usr/bin/id -un)
header_text=${module_header_text:="$username"}

# PREPARATIONS ######################################################

# check if s-nail is available and if you have mail
if command -v s-nail 1>/dev/null; then
    # check mail for user
    if /usr/bin/s-nail -e; then
        hasmail=$(echo -e "  You have \e[1;${c_success}mmessages\e[0m.")
        
    else
        hasmail=$(echo -e "  You have no messages.")
    fi
else
    hasmail=""
fi

# trim banner text
header_text_width=${#header_text}
figlet_width=$(/usr/bin/env figlet -f "ANSI Shadow" "$header_text" | wc -L)
while [[ $figlet_width -ge 73 ]]; do
    let "header_text_width-=1"
    header_text=$(echo -e "${header_text:0:$header_text_width}...")
    figlet_width=$(/usr/bin/env figlet -f "ANSI Shadow" "$header_text" | wc -L)
done

# OUTPUT ############################################################

if [[ $module_header_text != "$username" ]]; then
    /usr/bin/env figlet -f "ANSI Shadow" "$header_text" \
        | sed "$d" \
        | sed "s/^/  /" \
        | echo -e "$(sed "1 s/^/\\\e[${c_txt_emphase}m/")" \
        | echo -e "$(sed "$ s/$/\\\e[0m/")"
    echo -e "  \e[1;${c_txt}mWelcome \e[${c_txt_emphase}m${username}\e[${c_txt}m, it is \e[${c_txt_emphase}m$(date +"%Y-%m-%d %H:%M:%S %z")\e[${c_txt}m.\e[0m\n${hasmail}"
else
    echo -e "  Welcome"
    /usr/bin/env figlet -f "ANSI Shadow" "$header_text" \
        | sed "$d" \
        | sed "s/^/  /" \
        | echo -e "$(sed "1 s/^/\\\e[${c_txt_emphase}m/")" \
        | echo -e "$(sed "$ s/$/\\\e[0m/")"
    echo -e "  \e[1;${c_txt}mIt is \e[${c_txt_emphase}m$(date +"%Y-%m-%d %H:%M:%S %z")\e[${c_txt}m.\e[0m\n${hasmail}"
fi