#!/usr/bin/perl

start:
$|=1;

use Term::ReadKey;
ReadMode 3;
($w, $h) = GetTerminalSize;

$n = 0.97; #AI sternght
$l = 10; #difficulty

$x1 = $w/2; $y1 = $h/2;

@dxs = (-0.09, -0.08, -0.07, -0.06, -0.05, 0.05, 0.06, 0.07, 0.08, 0.09);

@d = (0.05, -0.05);
$dx = $d[rand @d];
$dy = $d[rand @d];

$x = $w/2-5;

while (1) {

$key = ReadKey -1;

if ($key eq "d") {$x++; $x = $w-10 if $x > $w-10}
if ($key eq "a") {$x--; $x = 0     if $x < 0}

$s = " " x (($x1-5)*$n) . "[========]";
$s .= "\n" x $y1 . " " x $x1 . "o"; 
$s .= "\n" x ($h-$y1-4) . " " x $x . "[========]\n\nyou:\t\t$you\ncomputer:\t$pc\n\r";
print $s;

$dx *= -1 if $x1 >= $w-1 || $x1 <= 0;
$dy *= -1 if  ($y1 >= $h-5 && $x1 > $x && $x1 < $x+10) || ($y1 <= 1 && $x1 > (($x1-5)*$n) && $x1 < (($x1+5)*$n));
$dx = $dxs[$x1-$x] if  ($y1 >= $h-5 && $x1 > $x && $x1 < $x+10) || ($y1 <= 1 && $x1 > (($x1-5)*$n) && $x1 < (($x1+5)*$n));

$x1 += $dx;
$y1 += $dy;

if ($y1 < 0) {ReadMode 0; ++$you; sleep 1; goto start} 
if ($y1 > $h-4) {ReadMode 0; ++$pc; sleep 1; goto start}

select(undef, undef, undef, 0.005/$l);
system('clear');

}

ReadMode 0;