#-*- perl -*-
#
#  Copyright (C) 2004,2005,2006 Ken'ichi Fukamachi
#   All rights reserved. This program is free software; you can
#   redistribute it and/or modify it under the same terms as Perl itself.
#
# $FML: Calendar.pm,v 1.4 2006/07/09 12:11:12 fukachan Exp $
#

package FML::Demo::Calendar;
use strict;
use vars qw(@ISA @EXPORT @EXPORT_OK $AUTOLOAD);
use Carp;

=head1 NAME

FML::Demo::Calendar - show a calendar (demonstration module).

=head1 SYNOPSIS

    use FML::Demo::Calendar;
    my $schedule = new FML::Demo::Calendar;

    $schedule->parse;

    # show table by w3m :-)
    my $tmp = $schedule->tmpfilepath;
    my $fh  = new FileHandle $tmp, "w";
    if (defined $wh) {
	$schedule->print($fh);
	$fh->close;
    }

    system "w3m -dump $tmp";
    unlink $tmp if -f $tmp;

=head1 DESCRIPTION

C<CAUTION:> This module is created just for a demonstration to show
how to write a module intended for your personal use. This module is
not enough mature nor secure.

This is also a demonstration module to show how to use and build up
modules to couple with CPAN and FML modules. For exaple, this routine
uses C<HTML::CalendarMonthSimple> under cpan/lib.

It parses files in ~/.schedule/ and output the schedule of this month
as HTML TABLE by default. To see it, you need a WWW browser
e.g. "w3m".

=head1 FILES in ~/.schedule/

Theare are arbitrary number of files. This module treis to parse all
files here and use only valid entries found in them.

The file format follows:

    # comment: the format is /^(\d+\/\d+)\s+(.*)/ or /^(*\/\d+)\s+(.*)/
    DATE CONTENT
    DATE CONTENT FORMAT IS ARBITORARY

where null lines or space lines are ignored.

    # the first day!
    01/01 shougatu yasumi

    # 20 of each month
    */20 doctor.


=head1 METHODS

=head2 new($args)

Constructor.

It speculates C<user> by $args->{ user } or $ENV{'USER'} or UID
and determines the path for ~user/.schedule/.

C<$args> can take the following variables:

   $args = {
       schedule_dir   => DIR,
       schedule_file  => FILE,
       mode           => MODE,
   };

C<CAUTION:>
   The string for ~user is restricted to ^[-\w\d\.\/_]+$.

   PATH is reset at the last of new() method.

=cut


# Descriptions: constructor. $args is optional, passed via CGI.pm
#               if fmlsci.cgi uses.
#                    OR
#               libexec/loaders's $args if fmlsch uses.
#    Arguments: OBJ($self) HASH_REF($args)
# Side Effects: none
# Return Value: OBJ
sub new
{
    my ($self, $args) = @_;
    my ($type) = ref($self) || $self;
    my $me     = {};
    my $user   = $args->{ user } || $ENV{'USER'};

    # default directory holding schdule file(s): ~/.schedule/ by default.
    use User::pwent;
    unless (defined $user) {
	my $p = getpwuid($<);
	$user = $p->name;
    }

    my $pw       = getpwnam($user);
    my $home_dir = $pw->dir;

    # simple check (not enough mature).
    # This code is not for security but to avoid -T (taint mode) error ;)
    use FML::Restriction::Base;
    my $safe = new FML::Restriction::Base;
    unless ($safe->regexp_match('fullpath', $home_dir)) {
	croak("invalid home directory string");
    }

    # search files under ~/.schedule/ by default.
    use File::Spec;
    $me->{ _user }          = $user;
    $me->{ _schedule_dir }  = File::Spec->catfile($home_dir, ".schedule");
    $me->{ _schedule_file } = undef;

    # import value from $args if specified.
    for my $key ('schedule_dir', 'schedule_file', 'mode') {
	if (defined $args->{ $key }) {
	    $me->{ "_$key" } = $args->{ $key };
	}
    }

    # reset PATH to execute w3m.
    $ENV{'PATH'} = '/bin/:/usr/bin:/usr/pkg/bin:/usr/local/bin';

    return bless $me, $type;
}


=head2 tmpfilepath($args)

return a tmpfile path name, which is under ~/.schedule directory.
It creates just a file path not file itself.

=cut


# Descriptions: determine a template file location.
#    Arguments: OBJ($self) HASH_REF($args)
# Side Effects: none
# Return Value: STR(filename)
sub tmpfilepath
{
    my ($self, $args) = @_;
    my $user   = $self->{ _user };
    my $dir    = $self->{ _schedule_dir };
    my $tmpdir = undef;

    if (-w $dir) {
	$tmpdir = $dir;
    }
    else {
	croak("$dir not exists\n")   unless -d $dir;
	croak("$dir not writable\n") unless -w $dir;
    }

    # XXX we should not create a temporary file in the public area
    # XXX such as /tmp/, so create it in ~/.schedule/.
    if (defined $tmpdir) {
	use File::Spec;
	$self->{ _tmpfile } = File::Spec->catfile($tmpdir, ".tmp.$$.html");
	return $self->{ _tmpfile };
    }
    else {
	croak("cannot determine \$tmpdir");
    }
}


=head2 parse($args)

Parse files in ~/.schedule/ or the specified schedule file.

=cut


# Descriptions: parse file(s).
#    Arguments: OBJ($self) HASH_REF($args)
# Side Effects: update calendar entries in $self object
#               (actually by _add_entry() calleded here)
# Return Value: none
sub parse
{
    my ($self, $args) = @_;
    my ($sec,$min,$hour,$mday,$month,$year,$wday) = localtime(time);

    # get the date to show
    $year  = $args->{ year }  || (1900 + $year);
    $month = $args->{ month } || ($month + 1);

    # schedule file
    my $data_dir  = $self->{ _schedule_dir };
    my $data_file = $self->{ _schedule_file };

    # pick up line matching this pattern
    my @pat = (
	       sprintf("^%04d%02d(\\d{1,2})\\s+(.*)",   $year, $month),
	       sprintf("^%04d/%02d/(\\d{1,2})\\s+(.*)", $year, $month),
	       sprintf("^%04d/%d/(\\d{1,2})\\s+(.*)",   $year, $month),

	       sprintf("^%02d(\\d{1,2})\\s+(.*)",       $month),
	       sprintf("^%02d/(\\d{1,2})\\s+(.*)",      $month),

	       sprintf("^\\\*/(\\d{1,2})\\s+(.*)"),
	       );

    if ($data_file && -f $data_file) {
	$self->_analyze($year, $month, $data_file, \@pat);
    }
    elsif (-d $data_dir) {
	$self->_analyze_dir($year, $month, $data_dir, \@pat);
    }
    else {
	croak("invalid data");
    }
}


# Descriptions: initialize Calendar object.
#    Arguments: OBJ($self) STR($year) STR($month)
# Side Effects: none
# Return Value: none
sub _init_calendar
{
    my ($self, $year, $month) = @_;

    use HTML::CalendarMonthSimple;
    my $cal = new HTML::CalendarMonthSimple('year'=> $year, 'month'=> $month);

    if (defined $cal) {
	$self->{ _calendar } = $cal;
    }
    else {
	croak("cannot create Calendar object");
    }

    $cal->width('70%');
    $cal->border(10);
    $cal->header(sprintf("%04d/%02d %s",  $year, $month, "schedule"));
    $cal->bgcolor('pink');
}


# Descriptions: parse the specified file.
#    Arguments: OBJ($self)
#               STR($year) STR($month) STR($file) ARRAY_REF($pattern)
# Side Effects: none
# Return Value: none
sub _analyze_file
{
    my ($self, $year, $month, $file, $pattern) = @_;

    # initialize year+month dependent Calendar object
    # since _analyze() adds matched data into this Calendar object.
    $self->_init_calendar($year, $month);

    $self->_analyze($file, $pattern);
}


# Descriptions: parse the specified files in the directory.
#    Arguments: OBJ($self)
#               STR($year) STR($month) STR($data_dir) ARRAY_REF($pattern)
# Side Effects: none
# Return Value: none
sub _analyze_dir
{
    my ($self, $year, $month, $data_dir, $pattern) = @_;

    # initialize year+month dependent Calendar object
    # since _analyze() adds matched data into this Calendar object.
    $self->_init_calendar($year, $month);

    use DirHandle;
    my $dh = new DirHandle $data_dir;

    if (defined $dh) {
	my $xdir;

      DIR:
	while (defined($xdir = $dh->read)) {
	    next DIR if $xdir =~ /~$/o;
	    next DIR if $xdir =~ /^\./o;

	    use File::Spec;
	    my $schedule_file = File::Spec->catfile($data_dir, $xdir);
	    if (-f $schedule_file) {
		$self->_analyze($schedule_file, $pattern);
	    }
	}
    }
}


# Descriptions: open, read specified $file and
#               analyze the line which matches $pattern.
#    Arguments: OBJ($self) STR($file) STR($pattern)
# Side Effects: update $self object by _add_entry()
# Return Value: none
sub _analyze
{
    my ($self, $file, $pattern) = @_;

    # ignore if the file not exists.
    return unless -f $file;

    use FileHandle;
    my $fh = new FileHandle $file;

    if (defined $fh) {
	my $buf;

      LINE:
	while ($buf = <$fh>) {
	    for my $pat (@$pattern) {
		# XXX $pat is /($re_date)(.*)/.
		if ($buf =~ /$pat/) {
		    $self->_add_entry($1, $2);
		    next LINE;
		}
	    }

	    # for example, "*/24 something"
	    if (0 && $buf =~ /^\*\/(\d+)\s+(.*)/) {
		$self->_add_entry($1, $2);
	    }
	}

	$fh->close();
    }
}


# Descriptions: add calendar entry to $self object.
#    Arguments: OBJ($self) STR($day) STR($buf)
# Side Effects: update $self object
# Return Value: none
sub _add_entry
{
    my ($self, $day, $buf) = @_;
    my $cal = $self->{ _calendar };
    $day =~ s/^0//;

    if (defined $day && defined $buf) {
	print STDERR "day=$day buf=$buf\n" if 0;
	$cal->addcontent($day, "<p>$buf");
    }
}


=head2 print_as_html($fd)

print out the result as HTML.
You can specify the output channel by file descriptor C<$fd>.

=cut


# Descriptions: print Calendar by HTML::CalendarMonthSimple::as_HTML()
#               method.
#    Arguments: OBJ($self) HANDLE($fd)
# Side Effects: none
# Return Value: none
sub print_as_html
{
    my ($self, $fd) = @_;

    if (defined $self->{ _calendar }) {
	$fd = defined $fd ? $fd : \*STDOUT;
	print $fd $self->{ _calendar }->as_HTML;
    }
    else {
	croak("undefined schedule object");
    }
}


=head2 print_specific_month($fh, $month, $year)

print range specified by C<$month> and C<$year>.
C<$month> is a number or string among C<this>, C<next> and C<last>.

=cut


# Descriptions: print Calendar for specific month as HTML.
#    Arguments: OBJ($self) HANDLE($fh) STR($month) [STR($year)]
# Side Effects: none
# Return Value: none
sub print_specific_month
{
    my ($self, $fh, $month, $year) = @_;
    my ($month_now, $year_now) = (localtime(time))[4,5];
    my $default_year           = 1900 + $year_now;
    my $default_month          = $month_now + 1;
    my ($thismonth, $thisyear) = ($default_month, $default_year);

    if ($month =~ /^\d+$/) {
	$thismonth = $month;
	$thisyear  = $year if defined $year;
    }
    else {
	# XXX-TODO: fix $thisyear ?
	if ($default_month == 1) {
	    $thismonth =  2 if $month eq 'next';
	    $thismonth = 12 if $month eq 'last';
	}
	elsif ($default_month == 12) {
	    $thismonth =  1 if $month eq 'next';
	    $thismonth = 11 if $month eq 'last';
	}
	else {
	    $thismonth++ if $month eq 'next';
	    $thismonth-- if $month eq 'last';
	}
    }

    print $fh "<A NAME=\"$month\">\n";
    $self->parse( { month => $thismonth, year => $thisyear } );

    # show overview if this month.
    if ($thismonth == $default_month) {
	print $fh "<pre>\n";
	$self->_print_specific_day($fh, time);
	$self->_print_specific_day($fh, time + 24*3600);
	$self->_print_specific_day($fh, time + 48*3600);
	print $fh "</pre>\n";
    }

    # calendar style
    $self->print_as_html($fh);
}


# Descriptions: print schedule at the day specified by unix time $time.
#    Arguments: OBJ($self) HANDLE($fh) NUM($time)
# Side Effects: none
# Return Value: none
sub _print_specific_day
{
    my ($self, $fh, $time) = @_;
    my $cal = $self->{ _calendar };

    my ($sec,$min,$hour,$mday,$month,$year,$wday) = localtime($time);
    my $buf = $cal->getcontent($mday) || '';
    $buf =~ s/^\s*//;
    $buf =~ s/<p>//;
    $buf =~ s/<p>/,/g;
    printf $fh "%02d: %s\n", $mday, $buf;
}


=head1 MODE

=head2 get_mode( )

show mode (string).

=head2 set_mode( $mode )

override mode.
The mode is either of 'text' or 'html'.

XXX: The mode is not used in this module itsef.
     This is a pragma for other module use.

=cut


# Descriptions: show the current $mode.
#    Arguments: OBJ($self)
# Side Effects: none
# Return Value: STR or undef
sub get_mode
{
    my ($self) = @_;
    return (defined $self->{ _mode } ? $self->{ _mode } : undef);
}


# Descriptions: override $mode.
#    Arguments: OBJ($self) STR($mode)
# Side Effects: update $self object
# Return Value: STR
sub set_mode
{
    my ($self, $mode) = @_;

    if (defined $mode) {
	$self->{ _mode } = $mode;
    }
    else {
	$self->{ _mode } = undef;
    }
}


=head1 CODING STYLE

See C<http://www.fml.org/software/FNF/> on fml coding style guide.

=head1 AUTHOR

Ken'chi Fukamachi

=head1 COPYRIGHT

Copyright (C) 2004,2005,2006 Ken'chi Fukamachi

All rights reserved. This program is free software; you can
redistribute it and/or modify it under the same terms as Perl itself.

=head1 HISTORY

FML::Demo::Calendar first appeared in fml8 mailing list driver package.
See C<http://www.fml.org/> for more details.

Firstly this module name is C<TinyScheduler.pm> and renamed to
Calendar::Lite later. In 2004, it is renamed to FML::Demo::Calendar
again since this module must depend FML::* classes.

=cut


1;