#!/usr/bin/env perl
use strict;
use warnings;
use 5.010;
use autodie;

use GD;
use Getopt::Std;

my %opts;

getopts('a:cfgC:', \%opts);

my $alpha = $opts{'a'} // 0;

my $im = GD::Image->new(200, 40);
$im->saveAlpha(1);

my $fg = $im->colorAllocateAlpha(  0,   0,   0, $alpha);
my $bg = $im->colorAllocateAlpha(  0,   0,   0, 127);

if ($opts{'C'}) {
	$fg = $im->colorAllocateAlpha(split(qr{,}, $opts{'C'}), $alpha);
}

my @lines = split(/\n/, qx{calendar});

if ($opts{'c'}) {
	say join("\n", @lines);
}
elsif ($opts{'g'}) {
	$im->filledRectangle(0, 0, 200, 40, $bg);

	for my $i (0 .. $#lines) {
		$lines[$i] =~ s{\t}{};
		$im->string(gdSmallFont, 2, 2 + (10 * $i), $lines[$i], $fg);
	}

	open(my $out_fh, '>', '/tmp/vcalendar.png');
	binmode $out_fh;
	print $out_fh $im->png();
	close($out_fh);
}

if ($opts{'f'}) {
	exec('feh', '/tmp/vcalendar.png');
}