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# $Id: NetPhos.pm,v 1.13.4.1 2006/10/02 23:10:32 sendu Exp $
#
# BioPerl module for Bio::Tools::Analysis::Protein::NetPhos
#
# Cared for by Heikki Lehvaslaiho <heikki-at-bioperl-dot-org>
#
# Copyright Richard Adams
#
# You may distribute this module under the same terms as perl itself
# POD documentation - main docs before the code
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=head1 NAME
Bio::Tools::Analysis::Protein::NetPhos - a wrapper around NetPhos server
=head1 SYNOPSIS
  use Bio::Tools::Analysis::Protein::NetPhos;
  my $seq; # a Bio::PrimarySeqI object
  my $threshold  = "0.90";
  my $netphos = Bio::Tools::Analysis::Protein::NetPhos->new
     ( -seq => $seq,
       -threshold => $threshold );
  # run NetPhos prediction on a sequence
  my $netphos->run();
  # alternatively you can say
  $netphos->seq($seq)->threshold($threshold)->run;
  die "Could not get a result" unless $netphos->status =~ /^COMPLETED/;
  print $netphos->result;     # print raw prediction to STDOUT
  foreach my $feat ( $netphos->result('Bio::SeqFeatureI') ) {
      # do something to SeqFeature
      # e.g. print as GFF
      print $feat->gff_string, "\n";
      # or store within the sequence - if it is a Bio::RichSeqI
      $seq->add_SeqFeature($feat)
 }
=head1 DESCRIPTION
This class is wrapper around the NetPhos 2.0 server which produces
neural network predictions for serine, threonine and tyrosine
phosphorylation sites in eukaryotic proteins.
See L<http://www.cbs.dtu.dk/services/NetPhos/>.
This the first implentation of Bio::SimpleAnalysisI which hopefully
will make it easier to write wrappers on various services. This class
uses a web resource and therefore inherits from Bio::WebAgent.
=head1 SEE ALSO
L<Bio::SimpleAnalysisI>, 
L<Bio::WebAgent>
=head1 FEEDBACK
=head2 Mailing Lists
User feedback is an integral part of the evolution of this and other
Bioperl modules. Send your comments and suggestions preferably to one
of the Bioperl mailing lists.  Your participation is much appreciated.
  bioperl-l@bioperl.org                  - General discussion
  http://bioperl.org/wiki/Mailing_lists  - About the mailing lists
=head2 Reporting Bugs
Report bugs to the Bioperl bug tracking system to help us keep track
the bugs and their resolution.  Bug reports can be submitted via the
web:
  http://bugzilla.open-bio.org/
=head1 AUTHORS
Richard Adams, Richard.Adams@ed.ac.uk, 
Heikki Lehvaslaiho, heikki-at-bioperl-dot-org
=head1 APPENDIX
The rest of the documentation details each of the object
methods. Internal methods are usually preceded with a _
=cut
# Let the code begin...
package Bio::Tools::Analysis::Protein::NetPhos;
use vars qw($FLOAT);
use strict;
use IO::String;
use Bio::SeqIO;
use HTTP::Request::Common qw (POST);
use Bio::SeqFeature::Generic;
use base qw(Bio::Tools::Analysis::SimpleAnalysisBase);
    $FLOAT = '[+-]?\d*\.\d*';
    my $URL = 'http://www.cbs.dtu.dk/cgi-bin/nph-webface';
    my $ANALYSIS_SPEC =
        {
         'name'        => 'NetPhos',
         'type'        => 'Protein',
         'version'     => '2.0',
         'supplier'    => 'Center for Biological Sequence Analysis,
                           Technical University of Denmark',
         'description' => 'Prediction of serine, threonine and tyrosine
                             phosphorylation sites in eukaryotic proteins',
        };
    my $INPUT_SPEC =
        [
         {
          'mandatory' => 'true',
          'type'      => 'Bio::PrimarySeqI',
          'name'      => 'seq',
         },
         {
          'mandatory' => 'false',
          'type'      => 'float',
          'name'      => 'threshold',
          'default'   => 0.8,
         }
        ];
    my $RESULT_SPEC =
        {
         ''                 => 'bulk',  # same as undef
         'Bio::SeqFeatureI' => 'ARRAY of Bio::SeqFeeature::Generic',
         'raw'              => 'Array of [ position, score, residue ]'
        };
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=head2 result
 Name    : result
 Usage   : $job->result (...)
 Returns : a result created by running an analysis
 Args    : none (but an implementation may choose
           to add arguments for instructions how to process
           the raw result)
The method returns a scalar representing a result of an executed
job. If the job was terminated by an error the result may contain an
error message instead of the real data (or both, depending on the
implementation).
This implementation returns differently processed data depending on
argument:
=over 3
=item undef
Returns the raw ASCII data stream but without HTML tags
=item 'Bio::SeqFeatureI'
The argument string defined the type of bioperl objects returned in an
array.  The objects are L<Bio::SeqFeature::Generic>.
=item anything else
Array of array references of [ position, score, residue].
=back
=cut
sub result {
    my ($self,$value) = @_;
    my @predictions;
    my @fts;
    if ($value ) {
        my $result = IO::String->new($self->{'_result'});
        while (<$result>) {
            next if /^____/;
            /^\S+ +(\d+) +\w+ +(0\.\d+) +.([STY])/;
            next unless $3 and $2 > $self->threshold;
            push @predictions, [$1, $2, $3];
        }
        if ($value eq 'Bio::SeqFeatureI') {
            foreach  (@predictions) {
                push @fts, Bio::SeqFeature::Generic->new
                    (-start   => $_->[0],
                     -end     => $_->[0] ,
                     -source  => 'NetPhos',
                     -primary => 'Site',
                     -tag     => {
                               score   => $_->[1],
                               residue => $_->[2] });
            }
            return @fts;
        }
        return \@predictions;
    }
    return $self->{'_result'};
}
HideShow 9 lines of Pod
=head2  threshold
 Usage   : $job->threshold(...)
 Returns  : The significance threshold of a prediction
 Args     : None (retrieves value) or a value beween 0 and 1.
 Purpose  : Get/setter of the threshold to be sumitted for analysis.
=cut
sub threshold {
   my ($self,$value) = @_;
   if( defined $value) {
       if ( $value !~ /$FLOAT/ or $value < 0 or $value > 1 ) {
           $self->throw("I need a value between 0 and 1 , not  [". $value. "]")
       }
       $self->{'_threshold'} = $value;
       return $self;
   }
   return $self->{'_threshold'} || $self->input_spec->[1]{'default'} ;
}
sub _init 
                {
        my $self = shift;
        $self->url($URL);
        $self->{'_ANALYSIS_SPEC'} =$ANALYSIS_SPEC;
        $self->{'_INPUT_SPEC'} =$INPUT_SPEC;
        $self->{'_RESULT_SPEC'} =$RESULT_SPEC;
        $self->{'_ANALYSIS_NAME'} =$ANALYSIS_SPEC->{name};
        return $self;
}
sub _run {
    my $self = shift;
    # format the sequence into fasta
    my $seq_fasta;
    my $stringfh = new IO::String($seq_fasta);
    my $seqout = new Bio::SeqIO(-fh => $stringfh,
                                -format => 'fasta');
    $seqout->write_seq($self->seq);
    $self->debug($seq_fasta);
    # delay repeated calls by default by 3 sec, set delay() to change
    $self->sleep;
    $self->status('TERMINATED_BY_ERROR');
    my $request = POST $self->url,
            Content_Type => 'form-data',
            Content      => [configfile => '/usr/opt/www/pub/CBS/services/NetPhos-2.0/NetPhos.cf',
                             SEQPASTE   => $seq_fasta];
    my $content = $self->request($request);
    my $text    = $content->content;
    my ($result_url) = $text =~ /follow <a href="(.*?)"/;
    return 0 unless $result_url;
    $self->debug("url is $result_url\n\n");
    my $ua2      = $self->clone;
    my $content2 = $ua2->request(POST $result_url);
    my $ua3      = $self->clone;
    $result_url  =~ s/&.*//;
    $self->debug("final result url is $result_url\n");
    my $content3 = $ua3->request(POST $result_url);
    #print Dumper $content3;
    my $response = $content3->content;
    $response =~ s/.*<pre>(.*)<\/pre>.*/$1/s;
    $response =~ s/<.*?>//gs;
    $self->{'_result'} = $response;
    $self->status('COMPLETED') if $response ne '';
}
1;