#!/usr/bin/perl -w
use strict;
use warnings;

use LWP::RobotUA;
use HTML::SimpleLinkExtor;

use vars qw/$http_ua $link_extractor/;

sub crawl {
    my @queue = @_;
    my %visited;
    my $a = 42464;
    my $base;
    dbmopen(%visited, "visited", 0666);
    while ( my $url = shift @queue ) {
        next if $visited{$url};

        my $response = $http_ua->get($url);
	if ($response->is_success) {
		my $content = $response->content
        	open FILE, '>' . ++$a . '.txt';
        	print FILE "$url\n";
		print FILE $content;
        	close FILE;

        	print qq{Downloaded: "$url"\n};

        	push @queue, do {
            		my $link_extractor = HTML::SimpleLinkExtor->new($url);
            		$link_extractor->parse($content);
            		$link_extractor->a;

        	};
        $visited{$url} = 1;
	} else {
		dbmclose(%visited);
    		die $response->status_line;
  	}
    }  
    
}

$http_ua = new LWP::RobotUA theusefulbot => 'bot@theusefulnet.com';
$http_ua->delay( 10 / 6000 );

crawl(@ARGV);