#
# BioPerl module for Bio::AlignIO::phylip
#
# Copyright Heikki Lehvaslaiho
#

=head1 NAME

Bio::AlignIO::phylip - PHYLIP format sequence input/output stream

=head1 SYNOPSIS

Do not use this module directly.  Use it via the Bio::AlignIO class.

This example shows how to write to phylip format:

    use Bio::AlignIO;
    use Bio::SimpleAlign;

    # Use -idlength to set the name length to something other than
    # the default 10 if you need longer ids.
    my $phylipstream = Bio::AlignIO->new(-format   => 'phylip',
                                         -fh       => \*STDOUT,
                                         -idlength => 30);
    # Convert data from one format to another
    my $gcgstream = Bio::AlignIO->new(-format => 'msf',
                                      -file   => 't/data/cysprot1a.msf');

    while( my $aln = $gcgstream->next_aln ) {
        $phylipstream->write_aln($aln);
    }

    # With phylip sequential format format
    $phylipstream->interleaved(0);
    # Or initialize the object like this
    $phylipstream = Bio::AlignIO->new(-interleaved => 0,
                                      -format      => 'phylip',
                                      -fh          => \*STDOUT,
                                      -idlength    => 20 );
    $gcgstream = Bio::AlignIO->new(-format => 'msf',
                                   -file   => 't/data/cysprot1a.msf');

    while( my $aln = $gcgstream->next_aln ) {
        $phylipstream->write_aln($aln);
    }

This example shows how to read phylip format:

    my $in = Bio::AlignIO->new(
      -file        => $inFile,
      -format      => 'phylip',
      -interleaved => 0,
      -longid      => 1
    );

    my $out = Bio::AlignIO->new(
      -file   => ">$outFile",
      -format => 'fasta'
    );

    while ( my $aln = $in->next_aln() ) {
      $out->write_aln($aln);
    }

The -longid argument is required if the input phylip format file
has ids with lengths greater then 10 characters.

=head1 DESCRIPTION

This object can transform Bio::SimpleAlign objects to and from PHYLIP
format. By default it works with the interleaved format. By specifying
the flag -interleaved =E<gt> 0 in the initialization the module can
read or write data in sequential format.

Reading phylip format with long IDs up to 50 characters is supported by
the flag -longid =E<gt>1. ID strings can be surrounded by single quotes.
They are mandatory only if the IDs contain spaces.

=head1 FEEDBACK

=head2 Support

Please direct usage questions or support issues to the mailing list:

I<bioperl-l@bioperl.org>

rather than to the module maintainer directly. Many experienced and
reponsive experts will be able look at the problem and quickly
address it. Please include a thorough description of the problem
with code and data examples if at all possible.

=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:

  https://github.com/bioperl/bioperl-live/issues

=head1 AUTHORS - Heikki Lehvaslaiho and Jason Stajich

Email: heikki at ebi.ac.uk
Email: jason at bioperl.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::AlignIO::phylip;
use vars qw($DEFAULTIDLENGTH $DEFAULTLINELEN $DEFAULTTAGLEN);
use strict;

use Bio::SimpleAlign;
use POSIX;    # for the rounding call

use base qw(Bio::AlignIO);

BEGIN {
    $DEFAULTIDLENGTH = 10;
    $DEFAULTLINELEN  = 60;
    $DEFAULTTAGLEN   = 10;
}

=head2 new

 Title   : new
 Usage   : my $alignio = Bio::AlignIO->new(-format => 'phylip'
            -file   => '>file',
            -idlength => 10,
            -idlinebreak => 1);
 Function: Initialize a new L<Bio::AlignIO::phylip> reader or writer
 Returns : L<Bio::AlignIO> object
 Args    : [specific for writing of phylip format files]
           -idlength => integer - length of the id (will pad w/
                        spaces if needed) when writing phylip
           -interleaved => boolean - whether interleaved
                           or sequential format required
           -line_length  => integer of how long a sequence lines should be
           -idlinebreak => insert a line break after the sequence id
                           so that sequence starts on the next line
           -flag_SI => whether or not write a "S" or "I" just after
                       the num.seq. and line len., in the first line
           -tag_length => integer of how long the tags have to be in
                         each line between the space separator. set it
                         to 0 to have 1 tag only.
           -wrap_sequential => boolean for whether or not sequential
                               format should be broken up or a single line
                               default is false (single line)
           -longid => boolean to read arbitrary long IDs (default is false)

=cut

sub _initialize {
    my ( $self, @args ) = @_;
    $self->SUPER::_initialize(@args);

    my ( $interleave, $linelen, $idlinebreak,
        $idlength, $flag_SI, $tag_length, $ws, $longid )
        = $self->_rearrange(
        [   qw(INTERLEAVED
                LINE_LENGTH
                IDLINEBREAK
                IDLENGTH
                FLAG_SI
                TAG_LENGTH
                WRAP_SEQUENTIAL
                LONGID)
        ],
        @args
        );
    $self->interleaved( $interleave ? 1 : 0 ) if defined $interleave;
    $self->idlength( $idlength || $DEFAULTIDLENGTH );
    $self->id_linebreak(1) if ($idlinebreak);
    $self->line_length($linelen) if defined $linelen && $linelen > 0;
    $self->flag_SI(1) if ($flag_SI);
    $self->tag_length($tag_length) if ( $tag_length || $DEFAULTTAGLEN );
    $self->wrap_sequential( $ws ? 1 : 0 );
    $self->longid( $longid      ? 1 : 0 );
    1;
}

=head2 next_aln

 Title   : next_aln
 Usage   : $aln = $stream->next_aln()
 Function: returns the next alignment in the stream.
           Throws an exception if trying to read in PHYLIP
           sequential format.
 Returns : L<Bio::SimpleAlign> object
 Args    :

=cut

sub next_aln {
    my $self = shift;
    my $entry;
    my ($seqcount, $residuecount, %hash,    $name,
        $str,      @names,        $seqname, $start,
        $end,      $count,        $seq
    );

    my $aln = Bio::SimpleAlign->new( -source => 'phylip' );

    # First, parse up through the header.
    # If we see a non-blank line that isn't the seqcount and residuecount line
    # then bail out of next_aln (return)
    while ( $entry = $self->_readline ) {
        if ( $entry =~ /^\s?$/ ) {
            next;
        } elsif ( $entry =~ /\s*(\d+)\s+(\d+)/ ) {
            ( $seqcount, $residuecount ) = ( $1, $2 );
            last;
        } else {
            $self->warn(
                "Failed to parse PHYLIP: Did not see a sequence count and residue count."
            );
            return;
        }
    }
    return unless $seqcount and $residuecount;

  # First alignment section. We expect to see a name and (part of) a sequence.
    my $idlen = $self->idlength;
    $count = 0;

    while ( $entry = $self->_readline ) {
        if ( $entry =~ /^\s?$/ ) {    # eat the newlines
            next;
        }

# Names can be in a few different formats:
# 1. they can be traditional phylip: 10 chars long, period. If this is the case, that name can have spaces.
# 2. they can be hacked with a long ID, as passed in with the flag -longid.
# 3. if there is a long ID, the name can have spaces as long as it is wrapped in single quotes.
        if ( $self->longid() ) {    # 2 or 3
            if ( $entry =~ /^'(.+)'\s+(.+)$/ ) {  # 3. name has single quotes.
                $name = $1;
                $str  = $2;
            } else { # 2. name does not have single quotes, so should not have spaces.
                 # therefore, the first part of the line is the name and the rest is the seq.
                 # make sure that the line does not lead with extra spaces.
                $entry =~ s/^\s+//;
                ( $name, $str ) = split( /\s+/, $entry, 2 );
            }
        } else {    # 1. traditional phylip.
            $entry =~ /^(.{1,10})\s(.+)$/;
            $name = $1;
            $str  = $2;
            $name =~ s/\s+$//;    # eat any trailing spaces
            $name =~ s/\s+/_/g;
        }
        push @names, $name;

        #clean sequence of spaces:
        $str =~ s/\s+//g;

# are we sequential? If so, we should keep adding to the sequence until we've got all the residues.
        if ( ( $self->interleaved ) == 0 ) {
            while ( length($str) < $residuecount ) {
                $entry = $self->_readline;
                $str .= $entry;
                $str =~ s/\s+//g;
                if ( $entry =~ /^\s*$/ ) { # we ran into a newline before we got a complete sequence: bail!
                    $self->warn(
                        "Failed to parse PHYLIP: Sequence $name was shorter than expected: "
                            . length($str)
                            . " instead of $residuecount." );
                    last;
                }
            }
        }
        $hash{$count} = $str;

        $count++;

        # if we've read as many seqs as we're supposed to, move on.
        if ( $count == $seqcount ) {
            last;
        }
    }

# if we are interleaved, we're going to keep seeing chunks of sequence until we get all of it.
    if ( $self->interleaved ) {
        while ( length( $hash{ $seqcount - 1 } ) < $residuecount ) {
            $count = 0;
            while ( $entry = $self->_readline ) {
                if ( $entry =~ /^\s*$/ ) {    # eat newlines
                    if ( $count != 0 ) { # there was a newline at an unexpected place!
                        $self->warn(
                            "Failed to parse PHYLIP: Interleaved file is missing a segment: saw $count, expected $seqcount."
                        );
                        return;
                    }
                    next;
                } else {    # start taking in chunks
                    $entry =~ s/\s//g;
                    $hash{$count} .= $entry;
                    $count++;
                }
                if ( $count >= $seqcount ) { # we've read all of the sequences for this chunk, so move on.
                    last;
                }
            }
        }
    }
    if ( ( scalar @names ) != $seqcount ) {
        $self->warn(
            "Failed to parse PHYLIP: Did not see the correct number of seqs: saw "
                . scalar(@names)
                . ", expected $seqcount." );
        return;
    }
    for ( $count = 0; $count < $seqcount; $count++ ) {
        $str = $hash{$count};
        my $seqname = $names[$count];
        if ( length($str) != $residuecount ) {
            $self->warn(
                "Failed to parse PHYLIP: Sequence $seqname was the wrong length: "
                    . length($str)
                    . " instead of $residuecount." );
        }
        $seq = Bio::LocatableSeq->new(
            '-seq'        => $hash{$count},
            '-display_id' => $seqname
        );
        $aln->add_seq($seq);
    }
    return $aln;
}

=head2 write_aln

 Title   : write_aln
 Usage   : $stream->write_aln(@aln)
 Function: writes the $aln object into the stream in phylip format
 Returns : 1 for success and 0 for error
 Args    : L<Bio::Align::AlignI> object

=cut

sub write_aln {
    my ( $self, @aln ) = @_;
    my $count   = 0;
    my $wrapped = 0;
    my $maxname;
    my $width = $self->line_length();
    my ($length,   $date,    $name,        $seq,       $miss,
        $pad,      %hash,    @arr,         $tempcount, $index,
        $idlength, $flag_SI, $line_length, $tag_length
    );

    foreach my $aln (@aln) {
        if ( ! $aln || ! $aln->isa('Bio::Align::AlignI') ) {
            $self->warn(
                "Must provide a Bio::Align::AlignI object when calling write_aln"
            );
            next;
        }
        $self->throw("All sequences in the alignment must be the same length")
            unless $aln->is_flush(1);

        $flag_SI = $self->flag_SI();
        $aln->set_displayname_flat();    # plain
        $length = $aln->length();
        if ($flag_SI) {
            if ( $self->interleaved() ) {
                $self->_print(
                    sprintf(
                        " %s %s I\n", $aln->num_sequences, $aln->length
                    )
                );
            } else {
                $self->_print(
                    sprintf(
                        " %s %s S\n", $aln->num_sequences, $aln->length
                    )
                );
            }
        } else {
            $self->_print(
                sprintf( " %s %s\n", $aln->num_sequences, $aln->length ) );
        }

        $idlength    = $self->idlength();
        $line_length = $self->line_length();
        $tag_length  = $self->tag_length();
        foreach $seq ( $aln->each_seq() ) {
            $name = $aln->displayname( $seq->get_nse );
            if ( $self->longid ) {
                $self->warn(
                    "The length of the name is over 50 chars long [$name]")
                    if length($name) > 50;
                $name = "'$name'  ";
            } else {
                $name = substr( $name, 0, $idlength )
                    if length($name) > $idlength;
                $name = sprintf( "%-" . $idlength . "s", $name );
                if ( $self->interleaved() ) {
                    $name .= '   ';
                } elsif ( $self->id_linebreak ) {
                    $name .= "\n";
                }
            }

            #phylip needs dashes not dots
            my $seq = $seq->seq();
            $seq =~ s/\./-/g;
            $hash{$name} = $seq;
            push( @arr, $name );
        }

        if ( $self->interleaved() ) {
            my $numtags;
            if ( $tag_length <= $line_length ) {
                $numtags     = floor( $line_length / $tag_length );
                $line_length = $tag_length * $numtags;
            } else {
                $numtags = 1;
            }
            while ( $count < $length ) {

                # there is another block to go!
                foreach $name (@arr) {
                    my $dispname = $name;
                    $dispname = '' if $wrapped;
                    $self->_print(
                        sprintf( "%" . ( $idlength + 3 ) . "s", $dispname ) );
                    $tempcount = $count;
                    $index     = 0;
                    $self->debug("residue count: $count\n")
                        if ( $count % 100000 == 0 );
                    while (( $tempcount + $tag_length < $length )
                        && ( $index < $numtags ) ) {
                        $self->_print(
                            sprintf(
                                "%s ",
                                substr(
                                    $hash{$name}, $tempcount, $tag_length
                                )
                            )
                        );
                        $tempcount += $tag_length;
                        $index++;
                    }

                    # last
                    if ( $index < $numtags ) {

                        # space to print!
                        $self->_print(
                            sprintf( "%s",
                                substr( $hash{$name}, $tempcount ) )
                        );
                        $tempcount += $tag_length;
                    }
                    $self->_print("\n");
                }
                $self->_print("\n");
                $count   = $tempcount;
                $wrapped = 1;
            }
        } else {
            foreach $name (@arr) {
                my $dispname = $name;
                my $line = sprintf( "%s%s\n", $dispname, $hash{$name} );
                if ( $self->wrap_sequential ) {
                    $line =~ s/(.{1,$width})/$1\n/g;
                }
                $self->_print($line);
            }
        }
    }
    $self->flush if $self->_flush_on_write && defined $self->_fh;
    return 1;
}

=head2 interleaved

 Title   : interleaved
 Usage   : my $interleaved = $obj->interleaved
 Function: Get/Set Interleaved status
 Returns : boolean
 Args    : boolean


=cut

sub interleaved {
    my ( $self, $value ) = @_;
    if ( defined $value ) {
        if ($value) {
          $self->{'_interleaved'} = 1
        } else {
          $self->{'_interleaved'} = 0
        }
    }
    return 1 unless defined $self->{'_interleaved'};
    return $self->{'_interleaved'};
}

=head2 flag_SI

 Title   : flag_SI
 Usage   : my $flag = $obj->flag_SI
 Function: Get/Set if the Sequential/Interleaved flag has to be shown
           after the number of sequences and sequence length
 Example :
 Returns : boolean
 Args    : boolean


=cut

sub flag_SI {
    my ( $self, $value ) = @_;
    my $previous = $self->{'_flag_SI'};
    if ( defined $value ) {
        $self->{'_flag_SI'} = $value;
    }
    return $previous;
}

=head2 idlength

 Title   : idlength
 Usage   : my $idlength = $obj->idlength
 Function: Get/Set value of id length
 Returns : string
 Args    : string


=cut

sub idlength {
    my ( $self, $value ) = @_;
    if ( defined $value ) {
        $self->{'_idlength'} = $value;
    }
    return $self->{'_idlength'};
}

=head2 line_length

 Title   : line_length
 Usage   : $obj->line_length($newval)
 Function:
 Returns : value of line_length
 Args    : newvalue (optional)


=cut

sub line_length {
    my ( $self, $value ) = @_;
    if ( defined $value ) {
        $self->{'_line_length'} = $value;
    }
    return $self->{'_line_length'} || $DEFAULTLINELEN;

}

=head2 tag_length

 Title   : tag_length
 Usage   : $obj->tag_length($newval)
 Function:
 Example : my $tag_length = $obj->tag_length
 Returns : value of the length for each space-separated tag in a line
 Args    : newvalue (optional) - set to zero to have one tag per line


=cut

sub tag_length {
    my ( $self, $value ) = @_;
    if ( defined $value ) {
        $self->{'_tag_length'} = $value;
    }
    return $self->{'_tag_length'} || $DEFAULTTAGLEN;
}

=head2 id_linebreak

 Title   : id_linebreak
 Usage   : $obj->id_linebreak($newval)
 Function:
 Returns : value of id_linebreak
 Args    : newvalue (optional)


=cut

sub id_linebreak {
    my ( $self, $value ) = @_;
    if ( defined $value ) {
        $self->{'_id_linebreak'} = $value;
    }
    return $self->{'_id_linebreak'} || 0;
}

=head2 wrap_sequential

 Title   : wrap_sequential
 Usage   : $obj->wrap_sequential($newval)
 Function:
 Returns : value of wrap_sequential
 Args    : newvalue (optional)


=cut

sub wrap_sequential {
    my ( $self, $value ) = @_;
    if ( defined $value ) {
        $self->{'_wrap_sequential'} = $value;
    }
    return $self->{'_wrap_sequential'} || 0;
}

=head2 longid

 Title   : longid
 Usage   : $obj->longid($newval)
 Function:
 Returns : value of longid
 Args    : newvalue (optional)


=cut

sub longid {
    my ( $self, $value ) = @_;
    if ( defined $value ) {
        $self->{'_longid'} = $value;
    }
    return $self->{'_longid'} || 0;
}

1;
