# HTML::CalendarMonthSimple.pm
# Generate HTML calendars. An alternative to HTML::CalendarMonth
# Herein, the symbol $self is used to refer to the object that's being passed around.

package HTML::CalendarMonthSimple;
my $VERSION     = "1.02";
use strict;
use Date::Calc;


# Within the constructor is the only place where values are access directly.
# Methods are provided for accessing/changing values, and those methods
# are used even internally.
# Most of the constructor is assigning default values.
sub new {
   my $class = shift; $class = ref($class) || $class;
   my $self = {}; %$self = @_; # Load ourselves up from the args

   # Set the month and year to either args or today
   ($self->{'month'})  || ($self->{'month'}  = (Date::Calc::Today)[1]);
   ($self->{'year'})   || ($self->{'year'}   = (Date::Calc::Today)[0]);

   # Some defaults
   $self->{'border'}             = 5;
   $self->{'width'}              = '100%';
   $self->{'showdatenumbers'}    = 1;
   $self->{'showweekdayheaders'} = 1;
   $self->{'cellalignment'}      = 'left';

   # Set the default calendar header
   $self->{'header'} = sprintf("<center><font size=+2>%s %d</font></center>",
                               Date::Calc::Month_to_Text($self->{'month'}),$self->{'year'});

   # Get the monthname now so monthname() is fast and efficient
   $self->{'monthname'} = Date::Calc::Month_to_Text($self->{'month'});

   # Initialize the (empty) cell content so the keys are representative of the month
   map { $self->{'content'}->{$_} = ''; } (1 .. Date::Calc::Days_in_Month($self->{'year'},$self->{'month'}));

   # All done!
   bless $self,$class; return $self;
}



sub as_HTML {
   my $self = shift;
   my $html = '';
   my(@days,$weeks,$WEEK,$DAY);

   # To make the grid even, pad the start of the series with 0s
   @days = (1 .. Date::Calc::Days_in_Month($self->year(),$self->month() ) );
   foreach (1 .. (Date::Calc::Day_of_Week($self->year(),$self->month(),1)%7) ) {
      unshift(@days,0);
   }
   $weeks = int((scalar(@days)+6)/7);

   # Define some scalars for generating the table
   my $border = $self->border();
   my $tablewidth = $self->width();
   $tablewidth =~ m/^(\d+)(\%?)$/; my $cellwidth = (int($1/7))||'14'; if ($2) { $cellwidth .= '%'; }
   my $header = $self->header();
   my $cellalignment = $self->cellalignment();
   my $bgcolor = $self->bgcolor() || '';
   my $weekdaycolor = $self->weekdaycolor() || $self->bgcolor();
   my $weekendcolor = $self->weekendcolor() || $self->bgcolor();
   my $weekdayheadercolor = $self->weekdayheadercolor() || $self->bgcolor();
   my $headercolor = $self->headercolor() || $self->bgcolor();

   # Now draw the grid
   $html .= "<TABLE BORDER=\"$border\" WIDTH=\"$tablewidth\" BGCOLOR=\"$bgcolor\">\n";
   $html .= "<tr><td colspan=7 bgcolor=\"$headercolor\">$header</td></tr>\n" if $header;
   if ($self->showweekdayheaders) {
      # Ultimately, this will display a hashref contents instead of a static week...
      #$html .= "<tr>\n<th>Sunday</th>\n<th>Monday</th>\n<th>Tuesday</th>\n<th>Wednesday</th>\n<th>Thursday</th>\n<th>Friday</th>\n<th>Saturday</th>\n</tr>\n";
      $html .= "<tr>\n<th bgcolor=\"$weekdayheadercolor\">Sunday</th>\n<th bgcolor=\"$weekdayheadercolor\">Monday</th>\n<th bgcolor=\"$weekdayheadercolor\">Tuesday</th>\n<th bgcolor=\"$weekdayheadercolor\">Wednesday</th>\n<th bgcolor=\"$weekdayheadercolor\">Thursday</th>\n<th bgcolor=\"$weekdayheadercolor\">Friday</th>\n<th bgcolor=\"$weekdayheadercolor\">Saturday</th>\n</tr>\n";
   }
   foreach $WEEK (0 .. ($weeks-1)) {
      $html .= "<TR>\n";
      foreach $DAY (0 .. 6) {
         my($thiscontent,$thisday,$thiscolor);
         $thisday = $days[((7*$WEEK)+$DAY)];
         # Get the cell content
         if (! $thisday) { # If it's a dummy cell, no content
            $thiscontent = '&nbsp;'; }
         else { # A real date cell with potential content
            # Get the content
            if ($self->showdatenumbers()) { 
              if ( $self->getdatehref( $thisday )) {
                $thiscontent = "<p><b><a href=".$self->getdatehref($thisday);
                $thiscontent .= ">$thisday</a></b></p>\n";
              } else {
                $thiscontent = "<p><b>$thisday</b></p>\n";
              }
            }
            $thiscontent .= $self->getcontent($thisday) || '&nbsp;';
         }
         # Get the cell color
         if (($DAY == 0) || ($DAY == 6)) { $thiscolor = $weekendcolor; }
         else                            { $thiscolor = $weekdaycolor; }
         # Done with this cell - push it into the table
         $html .= "<TD WIDTH=\"$cellwidth\" VALIGN=\"$cellalignment\" ALIGN=\"$cellalignment\" BGCOLOR=\"$thiscolor\">$thiscontent</TD>\n";
      }
      $html .= "</TR>\n";
   }
   $html .= "</TABLE>\n";

   return $html;
}

sub getdatehref {
  my $self = shift;
  my $date = shift || return();
  return $self->{'href'}->{$date};
}

sub setdatehref {
   my $self = shift;
   my $date = shift || return();
   my $datehref = shift || '';
   $self->{'href'}->{$date} = $datehref;
   return(1);
}

sub weekendcolor {
   my $self = shift;
   my $newvalue = shift;
   if (defined($newvalue)) { $self->{'weekendcolor'} = $newvalue; }
   return $self->{'weekendcolor'};
}

sub weekdayheadercolor {
   my $self = shift;
   my $newvalue = shift;
   if (defined($newvalue)) { $self->{'weekdayheadercolor'} = $newvalue; }
   return $self->{'weekdayheadercolor'};
}

sub weekdaycolor {
   my $self = shift;
   my $newvalue = shift;
   if (defined($newvalue)) { $self->{'weekdaycolor'} = $newvalue; }
   return $self->{'weekdaycolor'};
}

sub headercolor {
   my $self = shift;
   my $newvalue = shift;
   if (defined($newvalue)) { $self->{'headercolor'} = $newvalue; }
   return $self->{'headercolor'};
}

sub bgcolor {
   my $self = shift;
   my $newvalue = shift;
   if (defined($newvalue)) { $self->{'bgcolor'} = $newvalue; }
   return $self->{'bgcolor'};
}


sub getcontent {
   my $self = shift;
   my $date = shift || return();

   return $self->{'content'}->{$date};
}

sub setcontent {
   my $self = shift;
   my $date = shift || return();
   my $newcontent = shift || '';
   return() unless defined($self->{'content'}->{$date});
   $self->{'content'}->{$date} = $newcontent;
   return(1);
}

sub addcontent {
   my $self = shift;
   my $date = shift || return();
   my $newcontent = shift || return();
   return() unless defined($self->{'content'}->{$date});
   $self->{'content'}->{$date} .= $newcontent;
   return(1);
}



sub border {
   my $self = shift;
   my $newvalue = shift;
   if (defined($newvalue)) { $self->{'border'} = int($newvalue); }
   return $self->{'border'};
}


sub width {
   my $self = shift;
   my $newvalue = shift;
   if (defined($newvalue)) { $self->{'width'} = $newvalue; }
   return $self->{'width'};
}

sub showdatenumbers {
   my $self = shift;
   my $newvalue = shift;
   if (defined($newvalue)) { $self->{'showdatenumbers'} = $newvalue; }
   return $self->{'showdatenumbers'};
}
sub showweekdayheaders {
   my $self = shift;
   my $newvalue = shift;
   if (defined($newvalue)) { $self->{'showweekdayheaders'} = $newvalue; }
   return $self->{'showweekdayheaders'};
}

sub cellalignment {
   my $self = shift;
   my $newvalue = shift;
   if (defined($newvalue)) { $self->{'cellalignment'} = $newvalue; }
   return $self->{'cellalignment'};
}


sub year {
   my $self = shift;
   return $self->{'year'};
}

sub month {
   my $self = shift;
   return $self->{'month'};
}

sub monthname {
   my $self = shift;
   return $self->{'monthname'};
}


sub header {
   my $self = shift;
   my $newvalue = shift;
   if (defined($newvalue)) { $self->{'header'} = $newvalue; }
   return $self->{'header'};
}




__END__;
#################################################################################


=head1 NAME

HTML::CalendarMonthSimple - Perl Module for Generating HTML Calendars


=head1 SYNOPSIS

   use HTML::CalendarMonthSimple;
   $cal = new HTML::CalendarMonthSimple('year'=>2001,'month'=>2);
   $cal->width('50%');
   $cal->border(10);
   $cal->header('Text at the top of the Grid');
   $cal->setcontent(14,"Valentine's Day");
   $cal->setdatehref(14, 'http://www.lovers.com/');
   $cal->addcontent(14,"<p>Don't forget to buy flowers.");
   $cal->addcontent(13,"Thirteenth day of the month");
   $cal->bgcolor('pink');
   print $cal->as_HTML;


=head1 DESCRIPTION

HTML::CalendarMonthSimple is a Perl module for generating, manipulating, and printing a HTML calendar grid for a specified month. It is intended as a faster and easier-to-use alternative to HTML::CalendarMonth.

This module requires the Date::Calc module, which is available from CPAN if you don't already have it.



=head1 INTERFACE METHODS


=head1 new(ARGUMENTS)

Naturally, new() returns a newly constructed calendar object. Recognized arguments are 'year' and 'month', to specify which month's calendar will be used. If either is omitted, the current value is used. An important note is that the month and the year are NOT the standard C or Perl -- use a month in the range 1-12 and a real year, e.g. 2001.

   # Examples:
   # Create a calendar for this month.
   $cal = new HTML::CalendarMonthSimple();
   # One for a specific month/year
   $cal = new HTML::CalendarMonthSimple('month'=>2,'year=>2000);
   # One for "the current date" in 1997
   $cal = new HTML::CalendarMonthSimple('year'=>1997);


=head1 setcontent(DATE,STRING)

=head1 addcontent(DATE,STRING)

=head1 getcontent(DATE)

These methods are used to control the content of date cells within the calendar grid.

   # Examples:
   # The cell for the 15th of the month will now say something.
   $cal->setcontent(15,"An Important Event!");
   # Later down the program, we want the content to be boldfaced.
   $foo = "<b>" . $cal->getcontent(15) . "</b>";
   $cal->setcontent(15,$foo);
   # Or we could get extra spiffy:
   $cal->setcontent(15,"<b>" . $cal->getcontent(15) . "</b>");

   # Example:
   # addcontent() does not clober existing content.
   # Also, if you setcontent() to '', you've deleted the content.
   $cal->setcontent(16,'');
   $cal->addcontent(16,"<p>Hello World</p>");
   $cal->addcontent(16,"<p>Hello Again</p>");
   print $cal->getcontent(16); # Prints 2 sentences


=head1 setdatehref(DATE,URL_STRING)

=head1 getdatehref(DATE)

These methods are used to control the content of date cells within the calendar grid.

   # Example:
   # The date number in the cell for the 15th of the month will 
   # be a link to the sourceforge website
   $cal->setdatehref(15,"http://sourceforge.net/");

   # Example:
   # You want to add to an URL
   $cal->setdatehref(15, $getdatehref(15)."projects/perl/");


=head1 as_HTML()

This method returns a string containing the HTML table for the month.

   # Example:
   print $cal->as_HTML();

It's okay to continue modifying the calendar after calling as_HTML(). My guess is that you'd want to call as_HTML() again to print the further-modified calendar, but that's your business...


=head1 year()

=head1 month()

=head1 monthname()

These methods simply return the year/month of the calendar. monthname() returns the text name of the month, e.g. "December".


=head1 border([INTEGER])

This specifies the value of the border attribute to the <TABLE> declaration for the calendar. As such, this controls the thickness of the border around the calendar table. The default value is 5.

If a value is not specified, the current value is returned. If a value is specified, the border value is changed and the new value is returned.


=head1 width([INTEGER][%])

This sets the value of the width attribute to the <TABLE> declaration for the calendar. As such, this controls the horizintal width of the calendar.

The width value can be either an integer (e.g. 600) or a percentage string (e.g. "80%"). Most web browsers take an integer to be the table's width in pixels and a percentage to be the table width relative to the screen's width. The default width is "100%".

If a value is not specified, the current value is returned. If a value is specified, the border value is changed and the new value is returned.

   # Examples:
   $cal->width(600);    # absolute pixel width
   $cal->width("100%"); # percentage of screen size


=head1 showdatenumbers([1 or 0])

If showdatenumbers() is set to 1, then the as_HTML() method will put date labels in each cell (e.g. a 1 on the 1st, a 2 on the 2nd, etc.) If set to 0, then the date labels will not be printed. The default is 1.

If no value is specified, the current value is returned.

The date numbers are shown in boldface, normal size font. If you want to change this, consider setting showdatenumbers() to 0 and using setcontent()/addcontent() instead.


=head1 showweekdayheaders([1 or 0])

If showweekdayheaders() is set to 1 (the default) then calendars rendered via as_HTML() will display the names of the days of the week. If set to 0, the days' names will not be displayed.

If no value is specified, the current value is returned.


=head1 cellalignment([STRING])

This sets the value of the align attribute to the <TD> tag for each day's cell. This controls how text will be centered/aligned within the cells.

Any value can be used, if you think the web browser will find it interesting. Some useful alignments are: left, right, center, top, and bottom,

By default, cells are aligned to the left.


=head1 header([STRING])

By default, the current month and year are displayed at the top of the calendar grid. This is called the "header".

The header() method allows you to set the header to whatever you like. If no new header is specified, the current header is returned.

If the header is set to an empty string, then no header will be printed at all. (No, you won't be stuck with a big empty cell!)

   # Example:
   # Set the month/year header to something snazzy.
   my($y,$m) = ( $cal->year() , $cal->monthname() );
   $cal->header("<center><font size=+2 color=red>$m $y</font></center>\n\n");


=head1 bgcolor([STRING])

=head1 weekdaycolor([STRING])

=head1 weekendcolor([STRING])

=head1 weekdayheadercolor([STRING])

=head1 headercolor([STRING])

These define the colors of the cells. If a string (which should be a HTML color-code like '#000000' or a color-word like 'yellow') is supplied as an argument, then the color is set to that specified. Otherwise, the current value is returned. To un-set a value, try assigning the null string as a value.

The bgcolor defines the color of all cells. The weekdaycolor overrides the bgcolor for weekdays (Monday thru\ough Friday), and the weekendcolor overrides the bgcolor for weekend days (Saturday and Sunday). The weekdayheadercolor overrides the bgcolor for the weekday headers that appear at the top of the calendar if showweekdayheaders() is true. The headercolor overrides the bgcolor for the month/year header at the top of the calendar.

   # Example:
   # This sets a default cell color, and then overrides the cell colors.
   # Only the weekday headers aren't overridden, so only they will show
   # the default bgcolor of green.
   # P.S. I don't recommend this color scheme for production use. ;)
   $cal->bgcolor('green');
   $cal->weekdaycolor('orange');
   $cal->weekendcolor('blue');
   #$cal->weekdayheadercolor('silver');
   $cal->headercolor('yellow');


=head1 BUGS, TODO, CHANGES

It would be nice if the week didn't have to start on Sunday. It would also be cool if the weekday headers could be changed (Lunes, Martes, Miercoles,...)  or suppressed. It'd be nice if the month could be translated, as well. These features will probably make in into the next version some time in April 2001. If anyone wants to take on any of this work, please feel invited.

Changes in 1.01: Added VALIGN to cells, to make alignment work with browsers better. Added showweekdayheaders(). Corrected a bug that results in the month not fitting on the grid (e.g. March 2003).  Added getdatehref() and setdatehref(). Corrected a bug that causes a blank week to be printed at the beginning of some months.

Changes in 1.02: Added the color methods.


=head1 AUTHORS, CREDITS, COPYRIGHTS

HTML::CalendarMonth was written and is copyrighted by Matthew P. Sisk <sisk@mojotoad.com> and provided inspiration for the module's interface and features. Frankly, the major inspiration was the difficulty and unnecessary complexity of the interface. (Laziness is a virtue.)

HTML::CalendarMonthSimple was written by Gregor Mosheh <stigmata@blackangel.net> None of Matt Sisk's code appears herein.

This would have been extremely difficult if not for Date::Calc. Many thanks to Steffen Beyer <sb@engelschall.com> for a very fine set of date-related functions!

Dave Fuller <dffuller@yahoo.com> added the getdatehref() and setdatehref() methods, and pointed out the bugs that were corrected in 1.01.

Danny J. Sohier <danny@gel.ulaval.ca> provided the color functions.

This Perl module is freeware. It may be copied, derived, used, and distributed without limitation.