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#!/bin/bash

trap "tput reset; tput cnorm; exit" 2

clear

tput civis

lin=2

col=$(($(tput cols) / 2))

c=$((col-1))

est=$((c-2))

color=0

tput setaf 2; tput bold

# Tree

for ((i=1; i<20; i+=2))

{

    tput cup $lin $col

    for ((j=1; j<=i; j++))

    {

        echo -n \*

    }

    let lin++

    let col--

}

tput sgr0; tput setaf 3

# Trunk

for ((i=1; i<=2; i++))

{

    tput cup $((lin++)) $c

    echo 'mWm'

}

new_year=$(date +'%Y')

let new_year++

tput setaf 1; tput bold

tput cup $lin $((c - 6)); echo MERRY CHRISTMAS

tput cup $((lin + 1)) $((c - 10)); echo And lots of CODE in $new_year

let c++

k=1

# Lights and decorations

while true; do

    for ((i=1; i<=35; i++)) {

        # Turn off the lights

        [ $k -gt 1 ] && {

            tput setaf 2; tput bold

            tput cup ${line[$[k-1]$i]} ${column[$[k-1]$i]}; echo \*

            unset line[$[k-1]$i]; unset column[$[k-1]$i]  # Array cleanup

        }

        li=$((RANDOM % 9 + 3))

        start=$((c-li+2))

        co=$((RANDOM % (li-2) * 2 + 1 + start))

        tput setaf $color; tput bold   # Switch colors

        tput cup $li $co

        echo o

        line[$k$i]=$li

        column[$k$i]=$co

        color=$(((color+1)%8))

        # Flashing text

        sh=1

        for l in C O D E

        do

            tput cup $((lin+1)) $((c+sh))

            echo $l

            let sh++

            sleep 0.01

        done

    }

    k=$((k % 2 + 1))