#!/usr/bin/perl -w

use Data::Dumper;
use Date::Calc qw/Day_of_Week Days_in_Month/;

use strict;

print STDOUT Dumper(&calendar_array);
exit 0;


sub calendar_array (;$$) {
    my $year = ($_[0] =~ /^\d{4}$/) ? $_[0] : (((localtime)[5]) + 1900);
    my $month = (($_[1] =~ /^\d+$/) && (($_[1] > 0) && ($_[1] < 13))) ? $_[1] : (((localtime)[4]) + 1);
    my (@calendar, @output);
    my $day = 1 - Day_of_Week($year, $month, 1);
    while ($#calendar < 41) {
        push (@calendar, (($day <= 0) || ($day > Days_in_Month($year, $month))) ? '' : $day);
        ++$day;
    }
    for (my $row = 0; $row < 6; $row++) {
        my @columns;
        for (my $col = 0; $col < 7; $col++) {
            push (@columns, {
                'day'       =>  $calendar[$row * 7 + $col],
            });
        }
        push (@output, {
            'row'  =>  \@columns
        });
    }
    return \@output;
}