# Czech.pm
#
# (c) 2005 Jiri Vaclavik <jiri.vaclavik@gmail.com>
# All rights reserved. This program is free software; you can redistribute
# and/or modify it under the same terms as perl itself.

=head1 NAME

Date::Say::Czech - Output dates as text as you would speak it

=head1 SYNOPSIS

use Date::Say::Czech;

print time_to_say(time());
print date_to_say($DAY, $MONTH, $YEAR);

=head1 DESCRIPTION

This module provides you with functions to easily convert a date (given
as either integer values for day, month and year or as a unix timestamp)
to its representation as czech text, like you would read it aloud.

=head1 EXPORTABLE TAGS

:ALL    - all helper methods are also exported into the callers namespace

=head1 FUNCTIONS

=head2 Exported by default

=over 2

=item B<time_to_say($TIMESTAMP)>

In scalar context, return a string consisting of the text
representation of the date in the given unix timestamp,
like e.g. "dvacátého pátého června dva tisíce pět".

In list context, returns the three words of the string as a list.

=item B<date_to_say($DAY, $MONTH, $YEAR)>

Takes the values for day of month, month and year as integers
(month starting with B<1>) and gives the same return values as
I<time_to_say>.

=back

=head2 Exported by :ALL

=over 2

=item B<year_to_say($YEAR)>

Takes a year (absolute integer value) as input and returns the
text representation in Czech.

=item B<month_to_speak($MONTH)>

Takes a month (integer value, January = 1) as input and returns
the text representation in Czech.

=item B<day_to_say($DAY)>

Converts a day number to its Czech text representation.

=back

=head1 BUGS

Please report all bugs to the author of this module:
Jiri Vaclavik <jiri.vaclavik@gmail.com>

=for html <a href="mailto:jiri.vaclavik@gmail.com?subject=Bug%20in%20Date::Say::Czech">Mail a Bug</a>

=head1 AUTHOR

Jiri Vaclavik <jiri.vaclavik@gmail.com>

=head1 SEE ALSO

Date::Spoken::German from Christian Winter


=cut

package Date::Say::Czech;

require Exporter;
require POSIX;

@ISA = qw(Exporter Date::Say::Czech);
@EXPORT_OK = qw(date_to_say time_to_say);
%EXPORT_TAGS = ( ALL => [qw(year_to_say date_to_say time_to_say month_to_say day_to_say)] );
$VERSION = "0.02";
$AUTHOR = 'Jiri Vaclavik <jiri.vaclavik@gmail.com>';

my %cipher = (1 => "jedna", 2 => "dva", 3 => "tři", 4 => "čtyři", 5 => "pět", 6 => "šest", 7 => "sedm", 8 => "osm", 9 => "devět", 10 => "deset", 11 => "jedenáct", 12 => "dvanáct", 13 => "třináct", 14 => "čtrnáct", 15 => "patnáct", 16 => "šestnáct", 17 => "sedmnáct", 18 => "osmnáct", 19 => "devatenáct");
my %specialcipher = (1 => "prvního", 2 => "druhého", 3 => "třetího", 4 => "čtvrtého", 5 => "pátého", 6 => "šestého", 7 => "sedmého", 8 => "osmého", 9 => "devátého", 10 => "desátého", 11 => "jedenáctého", 12 => "dvanáctého", 13 => "třináctého", 14 => "čtrnáctého", 15 => "patnáctého", 16 => "šestnáctého", 17 => "sedmnáctého", 18 => "osmnáctého", 19 => "devatenáctého");
my %tens = (1 => "deset", 2 => "dvacet", 3 => "třicet", 4 => "čtyřicet", 5 => "padesát", 6 => "šedesát", 7 => "sedmdesát", 8 => "osmdesát", 9 => "devadesát" );
my %specialtens = (1 => "desátého", 2 => "dvacátého", 3 => "třicátého", 4 => "čtyřicátého", 5 => "padesátého", 6 => "šedesátého", 7 => "sedmdesátého", 8 => "osmdesátého", 9 => "devadesátého" );
my %months = (  1 => "leden", 2 => "únor", 3 => "březen", 4 => "duben", 5 => "květen", 6 => "červen", 7 => "červenec", 8 => "srpen", 9 => "září", 10 => "říjen", 11 => "listopad", 12 => "prosinec" );
my %specialmonths = (  1 => "ledna", 2 => "února", 3 => "března", 4 => "dubna", 5 => "května", 6 => "června", 7 => "července", 8 => "srpna", 9 => "září", 10 => "října", 11 => "listopadu", 12 => "prosince" );

sub year_to_say
{
    my $year = shift;
    (my $tens = $year) =~ s/^.*(\d\d)$/$1/;
    my $hundreds = "";
    if( $year < 10 ) {
        $tens = "";
        $hundreds = $cipher{$year} || "null";
    } else {
        if( $tens == 0 ) {
            $tens = "";
        } elsif( ($tens % 10) == 0 ) {
            $tens =~ s/(.)(.)/$tens{$1}/;
        } else {
            if( $tens < 10 ) {
                $tens =~ s/(.)(.)/$cipher{$2}/;
            } elsif( $tens < 20 ) {
                $tens =~ s/(.)(.)/$cipher{$1.$2}/;
            } else {
                $tens =~ s/(.)(.)/$tens{$1}." ".$cipher{$2}/e;
            }
        }
        if( $year >= 100 ) {
            ($hundreds = $year) =~ s/^(.?.)..$/$1/;
            if( $hundreds % 10 == 0) {
                $thousand = thousand_form($hundreds);
                if($hundreds == 10){
                    $hundreds =~ s/(.)(.)/"tisíc "/ex;
                }else{
                    $hundreds =~ s/(.)(.)/$cipher{$1}." ".$thousand/ex;
                }
            } else {
                if( $hundreds > 10 ) {
                    $thousand = thousand_form($hundreds);
                    if ($hundreds < 20){
                        $hundred = hundred_form($hundreds);
                        my($x, $y) = split("", $hundreds);
                        if($y == 1){
                            $hundreds =~ s/(.)(.)/"tisíc sto "/ex;
                        }else{
                            $hundreds =~ s/(.)(.)/"tisíc ".$cipher{$2}." $hundred "/ex;
                        }
                    }else{
                        $hundred = hundred_form($hundreds);
                        my($x, $y) = split("", $hundreds);
                        if($y == 1){
                           $hundreds = "sto ";
                        }else{
                            $hundreds =~ s/(.)(.)/$cipher{"$1"}." ".$thousand.$cipher{$2}." ".$hundred." "/e;
                        }
                    }
                } else {
                    if($hundreds == 1){
                       $hundreds = "sto ";
                    }else{
                       $hundred = hundred_form($hundreds);
                       $hundreds = $cipher{$hundreds}." ".$hundred;
                    }
                }
            }
        }
    }
    return $hundreds.$tens;
}

sub hundred_form {
    my($hundreds) = shift;
    my($x, $num) = split("", $hundreds);
    if($num > 4){
        return "set";
    }else{
        return "sta";
    }
}

sub thousand_form {
    my($num) = shift;
    if($num > 49){
        return "tisíc ";
    }else{
        return "tisíce ";
    }
}

sub month_to_say
{
    my $month = shift;
    return $specialmonths{$month};
}

sub day_to_say
{
    my $tag = shift;
    if( $tag >= 10 ) {
        $tag =~ s/(.)(.)/$specialcipher{"$1$2"} || $specialtens{$1}." ".$specialcipher{$2}/ex;
    } else {
        $tag = $specialcipher{$tag} || $cipher{$tag};
    }
    return $tag;
}

sub date_to_say
{
    my($day, $month, $year) = @_;
    if( wantarray ) {
        return day_to_say($day), " ", month_to_say($month), " ", year_to_say($year);
    } else {
        return day_to_say($day)." ".month_to_say($month)." ".year_to_say($year);
    }
}

sub time_to_say
{
    my($day, $month, $year) = (gmtime( shift || time() ))[3,4,5];
    return date_to_say($day, $month+1, 1900+$year);
}

1;