package Catalyst::View::RRDGraph;

use strict;
use warnings;

use base 'Catalyst::View';

our $VERSION = '0.01';

use RRDs;
use File::Temp qw();

sub new {
    my ($class, $c, $arguments) = @_;
    my $config = {
        'IMG_DIR' => '/tmp/',
        'IMG_FORMAT' => 'PNG',
        %{ $class->config },
        (defined($arguments)?%{$arguments}:()),
    };

    my $self = $class->NEXT::new(
        $c, { %$config },
    );

    $self->config($config);

    return ($self);
}

sub process {
    my ($self, $c) = @_;

    my $props = $c->stash->{'graph'};
    die "No graph in the stash" if (not defined $props);
    die "graph must be an ARRAYREF" if (ref($props) ne 'ARRAY');

    my $tempfile = File::Temp->new( TEMPLATE => 'cat_view_rrd_XXXXXX',
                                    DIR => $self->config->{'IMG_DIR'},
                                    SUFFIX => '.' . lc($self->config->{'IMG_FORMAT'}));

    RRDs::graph($tempfile->filename,
                '--imgformat', $self->config->{'IMG_FORMAT'},
                @$props);

    if (RRDs::error) {
        die(RRDs::error);
    } else {
        $c->serve_static_file($tempfile->filename);
    }
}

#################### main pod documentation begin ###################
## Below is the stub of documentation for your module. 
## You better edit it!


=head1 NAME

Catalyst::View::RRDGraph - RRD Graph View Class

=head1 SYNOPSIS

use the helper to create your View myapp_create.pl view RRDGraph RRDGraph

from the controller:

  sub routine :Local {
    my ($self, $c) = @_;
    
    $c->stash->{'graph'} = [
            "--lower-limit", "0",
            "--start", "end-1d",
            "--vertical-label", "My Label",
            "--height", 600,
            "--width", 300,
            "DEF:Data=/path/to/rrd.rrd:data:AVERAGE",
            "AREA:Data#0000FF:Data "
    ];
    $c->forward('MyApp::View::RRDGraph');
  }

=head1 DESCRIPTION

This view generates RRD graph images from the graph defintion placed in the stash. The controller is responsable of placing an ARRAYREF in B<$c->stash->{'graph'}> with the same data as to generate a graph with the RRDs module, except for I<filename>, that will be automatically generated by the view.

=head1 CONFIGURATION

Configurations for the view are:

=head2 IMG_DIR

Directory to generate temporary image files. Defaults to B</tmp/>

=head2 IMG_FORMAT

Image format for the generated files. 'PNG' by default. 

See http://oss.oetiker.ch/rrdtool/doc/rrdgraph.en.html for more info.

=head1 METHODS

=head2 new

Constructor.

=head2 process

Called internally by Catalyst when the view is used.

=head1 AUTHOR

    Jose Luis Martinez
    CPAN ID: JLMARTIN
    CAPSiDE
    jlmartinez@capside.com
    http://www.pplusdomain.net

=head1 COPYRIGHT

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

The full text of the license can be found in the
LICENSE file included with this module.


=head1 SEE ALSO

RRDs: http://oss.oetiker.ch/rrdtool/prog/RRDs.en.html

RRD graph docs: http://oss.oetiker.ch/rrdtool/doc/rrdgraph.en.html, http://oss.oetiker.ch/rrdtool/doc/rrdgraph_data.en.html, http://oss.oetiker.ch/rrdtool/doc/rrdgraph_graph.en.html

=cut

#################### main pod documentation end ###################


1;
# The preceding line will help the module return a true value