#!env perl
use strict;
use warnings;
use autodie qw/ open close /;
use 5.012;
use WWW::Mechanize;

# create WWW::Mechanize object
# autocheck 1 checks each request to ensure it was successful
my $browser = WWW::Mechanize->new( autocheck => [1] );

# retrieve page
$browser->get('http://www.ncbi.nlm.nih.gov/Traces/wgs/');

#select form to fill based on mech-dump output
$browser->form_number(1);

# fill field 'term' with name of species
$browser->field( 'term', 'Escherichia' );
$browser->field( 'size', 'all' );


# click apply button
$browser->submit('Apply');

my $url = $browser->uri;
print "url: $url\n";

$browser->follow_link( text_regex => qr/Download as TAB/i );
#print $browser->content();  # prints TAB delimited file to STDOUT

if ( my $filename = $browser->res->filename )
{
    die "file already exists [$filename]" if -e $filename;
    print STDERR "Saving downloaded file to [$filename]\n";
    open my $fh, ">", $filename;
    print $fh $browser->content;
    close $fh;
}