#!/usr/bin/perl -w
 

use strict;
use warnings;
use strict;
use Curses::UI;
use Net::Telnet;
use URI::Split;


my $HOST_DEFAULT = "nightfall.city";
my $PATHSPEC_DEFAULT = '';
my $PORT_DEFAULT = 1900;
my $PROT_NEX = "nex://";

my $home_default= $PROT_NEX . $HOST_DEFAULT;

my $host = "nightfall.city";
my $port = "1900";
my $pathspec = "";
my $docname = "";
my $doctype = "txt";
my $dot_ext = ".";

my @history;


my $statusbar;
my $win1;
my $cui = new Curses::UI( -color_support => 1 );
my $connect = new Net::Telnet (Timeout => 10,
                      Errmode => 'return');
my @menu = (
  { -label => 'File', 
    -submenu => [
   { -label => 'Go to Link  ^G', -value => \&goto_link_dialog },
   { -label => 'Change Site ^C', -value => \&goto_site_dialog },
   { -label => 'Back        ^B', -value => \&goto_back  },
   { -label => 'History     ^H', -value => "\&history_status_dialog"  },
   { -label => 'Exit        ^Q', -value => \&exit_dialog  }
                ]
   },

);

sub exit_dialog()
{
        my $return = $cui->dialog(
                -message   => "Really quit?",
                -title     => "Are you sure?", 
                -buttons   => ['yes', 'no'],
 
        );
 
exit(0) if $return;
}

sub goto_link_dialog()
{
	my $return = $cui->question(-question => "This is [$host/ $pathspec]. Enter destination link:",
								-answer => $pathspec,
							); 
	navigate($return);
}


sub goto_site_dialog()
{

	my $return = $cui->question(-question => "This is [$host/ $pathspec]. Visit site:",
								-answer => $host,
								); 
	if ($return){
		my $site = $return;
		if($site ne ''){ 
			$host = $site;
			add_history($host);
			load($pathspec);
			update_status_bar();
		}
		history_status_dialog();
	}
}
 

sub goto_back()
{
	my $fetched = fetch_history();
	#if($fetched) {
		$pathspec =$fetched;
		load($pathspec);
		update_status_bar();
		history_status_dialog();
	 #}

}



sub navigate{
	my $link = shift;
	#if ($link){
	#	if($link ne ''){ 
			add_history($pathspec);  #add last link to history before going forward!
			$pathspec = $link;
			load($pathspec);
	#	}else { 
	#		$pathspec = '';
	#	}
		update_status_bar();
 	#}
 
}


sub update_status_bar
{
	my $browser = $win1->getobj("browser");
	my $statusbar = $win1->getobj("status");
	$statusbar->text("Current site: $host, current link: [$pathspec]");
	$statusbar->draw();
	$browser->focus();
	

}


sub add_history
{
	my $link = shift;
	print ("link $link");
	push(@history, $link);
	history_status_dialog();
	return;
}

sub fetch_history
{
	my $latest;
	if(@history) {
		$latest = pop(@history);
		return $latest;
	}else{
    	return($PATHSPEC_DEFAULT);
	}
}


sub history_status_dialog
{
	if(@history){
		my $browser = $win1->getobj("browser");	
		$browser->focus();
		my $history_list = join(", ", @history);
		my $return = $cui->status("$history_list");
	}
}


my $menu = $cui->add(
        'menu','Menubar', 
        -menu => \@menu,
        -fg  => "blue",
);


$win1 = $cui->add(
                     'win1', 'Window',
                     -border => 1,
                     -y    => 1,
                     -bfg  => 'red',
                     -vscrollbar => 'right',
                     );

my $texteditor = $win1->add("browser", "TextViewer",
                        -text => "Start Page",
                        -border 	 => 1,
                       	-padtop		 => 0,	
                   		-padbottom 	 => 3,
            			-showlines	 => 0,
                     	-sbborder	 => 0,
                  		-vscrollbar	 => 1,
              			-hscrollbar	 => 1, 
          				-showhardreturns => 0,
                   		-wrapping        => 0, # wrapping slows down the editor :-(
                         );


$statusbar = $win1->add("status", "TextViewer",
	                     -border => 1,
        	             -bfg  => 'red',
        	             -y => -1,
        	             -height => 1,
        	             -width => -1,
        	             -reverse => 1,
        	             -paddingspaces => 1,
                         -text => "Current site: $HOST_DEFAULT, current link: [/]",
                         );
                         



#key bindings, should match menu items
$cui->set_binding(sub {$menu->focus()}, "\cX");
$cui->set_binding( \&exit_dialog , "\cQ");
$cui->set_binding( \&goto_link_dialog , "\cG");
$cui->set_binding( \&goto_back , "\cB");
$cui->set_binding( \&goto_site_dialog , "\cC");

#start up
$texteditor->focus();

navigate('');
$cui->mainloop();


#pick apart nex:// urls, which we should be using
#sub parse_url #need to pass in url; and host, pathspec, file variables to be filled
#{
#	my $url = @_[0];
#	my $host = url;
#	host =~ s/^nex://([a-z0-9]*)\/[a-z0-9\/\.]*$/$1/;
#	my $pathspec = url;
#	pathspec =~ s/^nex://[a-z0-9]*(\/[a-z0-9\/]*)[[a-z0-9\.]*$)/$1/;
#	my $file = $url
#	
#}


#make nex:// urls from parts, relative urls
#sub construct_valid_url #protocol, host, pathspec
#{
#	my $protocol = shift;
#	my $host = shift;
#	my $pathspec = shift;
#	my $file = shift;
#	my $url = $protocol;
#need error handling
#what about the end slash and files vs index?
#	$url = $protocol . $host;
#	if ($pathspec){
#		$url = $url . '/' . $pathspec;
#		if ($file){
#			$url = $url . '.' $file;
#		}
#	}
# 	return $url;
#}



sub load
{
	my $pathspec = shift;
    my @lines;
	my $ok;
	$connect->host($host);
	$connect->port($port);
	$ok= $connect->open($host);
	$ok= $connect->print($pathspec);
	@lines =$connect->getlines(ErrMode=> 'return');
    print $connect->eof();
#handle non-existant request?
    die unless $connect->eof();
	$connect->close();
    my $widget= $texteditor;
    my $loaded_text ="";
    my $currentline;
    my $count=0;
	foreach $currentline (@lines){
		if ($currentline =~ m/^=>/){
			$count+=1;
			$currentline =~ s/(^=>.*$)/$1 [\>$count\]/;
        }
		$loaded_text= $loaded_text . $currentline;
	}
	 $widget->text($loaded_text);

}