#! /usr/bin/perl
# $Id: gmap_process.pl.in,v 1.8 2010-07-21 22:02:18 twu Exp $

use warnings;

use IO::File;
use Getopt::Std;
undef($opt_c);			# coord file
undef($opt_g);			# gunzip each file
undef($opt_f);			# File with input FASTA source filenames
getopts("c:gf:");

if (!defined($coord_file = $opt_c)) {
  if (-e "coords.txt") {
    $coord_file = "coords.txt";
  } else {
    die "Must specify coordinate file (created by md_coords or fa_coords) with -c flag."
  }
}

read_coords($coord_file);

if (defined($opt_f)) {
    # Source files given in a file
    @sourcefiles = ();
    $SOURCES = new IO::File($opt_f) or die "Cannot open file $opt_f";
    while (defined($line = <$SOURCES>)) {
	chop $line;
	push @sourcefiles,$line;
    }
    close($SOURCES);
    process_fasta(\@sourcefiles);

} elsif ($#ARGV < 0) {
    # FASTA is piped via stdin
    @streams = ();
    push @streams,"<&STDIN";
    process_fasta(\@streams);

} else {
    # Source files given on command line
    process_fasta(\@ARGV);
}

check_processed();

exit;


sub read_coords {
  my ($coord_file) = @_;
  my $universal_coord = 0;

  $FP = new IO::File($coord_file) or die "Cannot open coord file $coord_file";
  print STDERR "Reading coordinates from file $coord_file\n";

  while (defined($line = <$FP>)) {
    if ($line =~ /^#/) {
	#if ($line =~ /Reference strain:\s*(\S+)/) {
	#$refstrain = $1;
	#}

    } else {
      $line =~ s/\r\n/\n/;
      chop $line;
      @fields = split /\s+/,$line;
      $contig = $fields[0];

      #if (!defined($strain{$contig} = $fields[2])) {
      #$strain{$contig} = "";
      #} elsif (defined($refstrain) && $strain{$contig} eq $refstrain) {
      #$strain{$contig} = "";
      #}

      $coords{$contig} = $fields[1];
      $universal_coord{$contig} = $universal_coord;

      ($chrstart,$chrend) = $coords{$contig} =~ /\S+:(\d+)\.\.(\d+)/;
      if (!defined($fields[2])) {
	  $universal_coord += $chrend - $chrstart + 1;
      } elsif ($fields[2] eq "circular") {
	  $circularp{$contig} = 1;
	  $universal_coord += $chrend - $chrstart + 1;
	  $universal_coord += $chrend - $chrstart + 1;
      } elsif ($fields[2] eq "primary") {
	  # Linear and primary
	  $universal_coord += $chrend - $chrstart + 1;
      } else {
	  # Altloc
	  $primary{$contig} = $fields[2];
	  $universal_coord += $chrend - $chrstart + 1;
      }
    }
  }
  close($FP);
  return;
}


sub find_contig_name {
    my ($contiginfo, $coords) = @_;

    if ($contiginfo !~ /\|/) {
	if (defined($ {$coords}{$contiginfo})) {
	    return $contiginfo;
	} elsif ($contiginfo =~ /(\S+)/ && defined($ {$coords}{$1})) {
	    return $1;
	} else {
	    # Failed
	    return $contiginfo;
	}
    } else {
	# Old code for FASTA files that contained pipe delimiters
	@parts = split /\|/,$contiginfo;
	foreach $part (@parts) {
	    if (defined($ {$coords}{$part})) {
		return $part;
	    } elsif ($part =~ /(\S+)/ && defined($ {$coords}{$1})) {
		return $1;
	    }
	}
	# Failed
	return $contiginfo;
    }
}

sub process_fasta {
  my ($argv) = @_;
  my $printp = 0;

  foreach $arg (@ {$argv}) {
      if (defined($opt_g)) {
	  $FP = new IO::File("gunzip -c \"$arg\" |") or die "Cannot open file $arg";
      } else {
	  $FP = new IO::File($arg) or die "Cannot open file $arg";
      }

      while (defined($line = <$FP>)) {
	  $line =~ s/\r\n/\n/;
	  chomp $line;
	  if ($line !~ /\S/) {
	      # Skip blank lines
	  } elsif ($line =~ /^>(\S+)/) {

	      # $contig = find_contig_name($1,\%coords);
	      $contig = $1;

	      if (!defined($coords{$contig})) {
		  print STDERR "No coordinates defined for contig $contig.  Skipping.\n";
		  $printp = 0;
		  
	      } else {
		  
		  # ($chr,$chrpos1,$chrpos2) = $coords{$contig} =~ /(\S+):(\d+)\D+(\d+)/;
		  # If $chrpos2 < $chrpos1, then contig needs to be reverse complement.
		  # However, gmapindex knows how to handle this
		  
		  $processedp{$contig} = 1;
		  #printf (">%s\t%s\t%s\n",$contig,$coords{$contig},$strain{$contig});
		  printf (">%s\t%s\t%u",$contig,$coords{$contig},$universal_coord{$contig});
		  if (defined($circularp{$contig})) {
		      print "\tcircular";
		  } elsif (defined($primary{$contig})) {
		      print "\t" . $primary{$contig};
		  }
		  print "\n";
		  $printp = 1;
		  
	      }
	  } elsif ($printp == 1) {
	      print $line . "\n";
	  }
      }

      close($FP);
  }

  return;
}


sub check_processed {
  $nwarnings = 0;
  foreach $contig (keys %coords) {
    if (!defined($processedp{$contig})) {
      print STDERR "Warning!!  Contig $contig was listed in coords file, but not seen in a FASTA file\n";
      $nwarnings++;
    }
  }
  if ($nwarnings > 0) {
    print STDERR "Warning: A total of $nwarnings contigs were listed in coords file, but not seen in a FASTA file\n";
    print STDERR "Should provide the correct FASTA files, or comment out these contigs in the coords file $coord_file\n";
  }
  return;
}

