package Agent;

use IvyIO;
use FugueConfig;

use strict;



#----------------------------------------------------------------------
#
# class variables and methods
#
#----------------------------------------------------------------------
my ($x0, $y0, $wmax, $dx, $dy, $cmin, $rmax, @matrix, @hosts, $tempo_id,
    $mw, $bg, $fg, $selcolor, $hlbg, $darkbg, $fontspec, @fontspec,
    $on_img, $off_img, %instances, @instances, $bus,
    $hosts_tl, $selected_host, $preselected_host);


# configure the class : graphic parameters, geometry and ivy bus
sub configure {
    shift;
    ($mw, $bg, $fg, $selcolor, $hlbg, $darkbg,
     $fontspec, $x0, $y0, $wmax, $dy, $cmin, $rmax, $bus) = @_;
    @fontspec = @$fontspec if $fontspec;
    $off_img = $mw->Bitmap('off', -file => Tk::findINC('led.bmp'),
			  -foreground => $bg);
    $on_img = $mw->Bitmap('on', -file => Tk::findINC('led.bmp'),
			   -foreground => $selcolor);
    &_resetmatrix;

} # end configure


# kill an named agent
sub kill {
    my ($class, $appname) = @_;
    IvyIO::kill($appname);
    
} # end kill;


# kill all agents
sub killall {
    my ($class) = @_;
    my $nb = 0;
    for(@instances) {
	if ($_->{status} > 0) {
	    IvyIO::kill($_->{appname});
	    $nb++;
	}
    }
    return $nb;
    
} # end killall;

# set usable hosts list for executing agents
sub hosts {
    shift;
    @hosts = @_;
    
} # end hosts

# callback called when an agent connects
sub connect {
    my ($class, $appname, $host) = @_;
    if ($instances{$appname}) {
	if ($instances{$appname}->{status} == 1) {
	    $instances{$appname}->addtwin;
	} else {
	    $instances{$appname}->on;
	}
    } else {
	$class->new($appname, $host, undef, undef, 1);
    }
    
} # end connect


# callback called when an agent disconnects
sub disconnect {
    my ($class, $appname, $host) = @_;
    if ($instances{$appname}) {
	if ($instances{$appname}->{number} > 1) {
	    $instances{$appname}->removetwin;
	} else {
	    $instances{$appname}->off;
	}
    } else {
	$class->new($appname, $host, undef, undef, 0);
    }
    
} # end disconnect

# class constructor
sub new {
    my ($class, $appname, $host, $command, $params, $status) = @_;
    if ($instances{$appname}) {
	$instances{$appname}->addtwin;
	return;
    }
    my $self = {};
    bless $self;
    
    # set object attributes
    $self->{appname} = $appname;
    $self->{status} = $status;
    $self->{host} = $host;
    $self->{command} = $command;
    $self->{params} = $params;
    $self->{number} = 1;
    $self->{led} = undef;
    $self->{label} = undef;
    
    # reset positions before adding new instance
    if (@instances >= ($rmax*$cmin)) {
	$cmin++;
	$class->_updatepositions;
    }
    # set class variables
    $instances{$appname} = $self;
    push(@instances, $self);
    
    # graphical updates
    $self->createlabel;
    $self->on if $status;

    $class->_alphabeticsort();

    return $self;

} # end new



#----------------------------------------------------------------------
#
# instance methods
#
#----------------------------------------------------------------------

# called when several agent instances are detected
sub addtwin {
    my $self = shift;
    $self->{number}++;
    $self->{label}->configure(-text => $self->formatlabel);

} # end addtwin

# called when an instance of a not single agent dies
sub removetwin {
    my $self = shift;
    return if $self->{number} == 1;
    $self->{number}--;
    $self->{label}->configure(-text => $self->formatlabel);
    
} # end addtwin

# graphical effect when a known agent connects
sub on {
    my $self = shift;
    $self->{status} = 1;
    $self->{led}->configure(-image => $on_img);
    $self->{label}->raise;
    $self->{label}->configure(-highlightthicknes => 2);
    $tempo_id = $mw->after(3000, sub {
	$self->{label}->configure(highlightthicknes => 0);
    });
    
} # end on

# graphical effect when a known agent disconnects

sub off {
    my $self = shift;
    $self->{status} = 0;
    $self->{led}->configure(-image => $off_img);

} # end off

# label placement
sub setposition {
    my $self = shift;
    my ($r, $c);
    for (my $i=0; $i<@matrix; $i++) {
	for (my $j=0; $j<=$#{$matrix[$i]}; $j++) {
	    unless ($matrix[$i][$j]->[0]) {
		($r, $c) = ($i, $j);
		last;
	    }
	}
	last if defined $r;
    }
    $matrix[$r][$c]->[0] = $self;
    my ($x, $y) = ($matrix[$r][$c]->[1], $matrix[$r][$c]->[2]);
    my $y2 = $y - 5;
    $y2 -= 12 if ($self->{label}->cget(-text) =~ /\n/);

    if ($self->{command}) {
	$self->{led}->configure(-highlightthickness => 6);
	$self->{led}->place(-x => $x+3, -y => $y+3);
    } else {
	$self->{led}->configure(-highlightthickness => 2);
	$self->{led}->place(-x => $x+6, -y => $y+6);
    }
    $self->{label}->place(-x => $x + 38, -y => $y2);
    
} # end setposition


# label creation
sub createlabel {
    my ($self) = @_;
    $self->{led} = 
  	$mw->Label(-image => $off_img,
  		   -highlightbackground => $hlbg,
  		   -borderwidth => 0,
  		   );
    $self->{label} =
	$mw->Label(-text =>  $self->formatlabel,
		   -pady => 10,
		   -justify => 'left',
		   -relief => 'flat',
		   -highlightthickness => 0,
		   -background => $darkbg,
		   -foreground => $fg,
		   @fontspec,
		   );
    $self->{led}->bind('<1>', [\&_cbOnPress, $self]);
    $self->{label}->bind('<1>', [\&_cbOnPress, $self]);

} # end createlabel

# label format : affects too long labels and not single agents
sub formatlabel {
    my ($self) = @_;
    my $im_width = 38;
    my $dx = $dx - $im_width;
    my $appname = $self->{appname};
    # for not single agents
    $appname = '['.$self->{number}.'] '.$appname if $self->{number} > 1;
    my $width = $mw->fontMeasure($fontspec[1], $appname);
    my $appnametext;
    # for too long names
    while ($width > 2*$dx) {
	$appname = substr($appname, 0, -1);
	$width = $mw->fontMeasure($fontspec[1], $appname);
    }
    if ($width > $dx) {
	my $hlen = int(length($appname)/2);
	my @fields = split(/:/, $appname);
	if (@fields > 1) {
	    my $len = 0;
	    my $imax = -1;
	    for (my $i=0; $i<@fields; $i++) {
		$len += length($fields[$i]);
		if ($len > $hlen) {
		    $imax = $i - 1;
		    last;
		}
	    }
	    if ($imax >= 0) {
		$appnametext = join(':', (@fields)[0..$imax])."\n".
		    join(':', (@fields)[$imax+1..$#fields]);
	    }
	}
	$appnametext = substr($appname, 0, $hlen)."\n".substr($appname, $hlen)
	    unless $appnametext;
    } else {
	my @fields = split(/:/, $appname);
	if (@fields > 1) {
	    $appnametext = $fields[0].":\n   ".join(':', (@fields)[1..$#fields]);
	}
    }
    $appnametext = $appname unless $appnametext;
    return $appnametext;
    
} # end formatlabel


#----------------------------------------------------------------------
#
# private methods or functions
#
#----------------------------------------------------------------------
sub _resetmatrix {
    $dx = $wmax/$cmin;
    for(my $r=0; $r<$rmax; $r++) {
	for(my $c=0; $c<$cmin; $c++) {
	    $matrix[$r][$c] = [undef, $x0 + $c*$dx, $y0 + $r*$dy];
	}
    }

} # end _resetmatrix


sub _updatepositions {
    &_resetmatrix;
    for (@instances) {
	$_->setposition();
	$_->{label}->configure(-text => $_->formatlabel);
    }
    
} # end _updatepositions


sub _alphabeticsort {
    &_resetmatrix;
    for (sort {uc($a->{appname}) cmp uc($b->{appname})} @instances) {
	$_->setposition();
    }
    
} # end _alphabeticsort


# callback invoked when user press on label
sub _cbOnPress {
    shift;
    my $self = shift;
    $self->{label}->configure(-foreground => $hlbg);
    if ($self->{status} == 1) {
        IvyIO::kill($self->{appname});
	  $mw->after(400, sub {$self->{label}->configure(-foreground => $fg);});
    } elsif ($self->{command}) {
	my ($x, $y) = ($self->{label}->rootx, $self->{label}->rooty);
	my $host = &_hostsmenu($x, $y, $self->{host});
	$self->{label}->configure(-foreground => $fg);
	return unless $host;
        FugueConfig::launchAgent($self->{appname}, $host,
				 $self->{command}, $self->{params}, $bus);
	  print "$self->{appname} launched\n";
    } else {
	$mw->bell;
	  $mw->after(400, sub {$self->{label}->configure(-foreground => $fg);});
    }
    
} # end _cbOnPress


# create and show hosts menu
sub _hostsmenu {
    my $x = shift;
    my $y = shift;
    $x += 50;
    
    my $preselected_host = shift;
    return $preselected_host if @hosts <= 1;
    $hosts_tl->destroy if Tk::Exists($hosts_tl);
    $hosts_tl = $mw->Toplevel(-background => $darkbg);
    $hosts_tl->resizable(0,0);
    $hosts_tl->title('ivycontrolpanel');
    my $hosts_fm = $hosts_tl->Frame(-background => $darkbg,
				    -highlightthickness => 3,
				    -highlightbackground => $hlbg,
				    )->pack(-side => 'top', -padx => 0, -pady => 0);
    my @lattr = (-padx => 10,
		 -pady => 10,
		 -relief => 'flat',
		 -highlightthickness => 0,
		 -background => $darkbg,
		 -foreground => $fg,
		 -borderwidth => 0,
		 @fontspec);
    my @battr = (@lattr,
		 -width => 4, -height => 1,
		 -highlightthickness => 3,
		 -highlightbackground => $hlbg,
		 -activebackground => $darkbg,
		 -activeforeground => $fg,
		 );
    my @rattr = (@lattr,
		 -activebackground => $darkbg,
		 -activeforeground => $fg,
		 -selectcolor => $selcolor);
    
    $hosts_fm->Label(@lattr, -text => "restart on :"
		     )->pack(-side => 'top', -padx => 20, -pady => 20);
    for(@hosts) {
	$hosts_fm->Radiobutton(@rattr,
			       -variable => \$preselected_host,
			       -value => $_,
			       -text => $_,
			       )->pack(-side => 'top');
    }
    my $fm = $hosts_fm->Frame(-background => $darkbg)->pack(-side => 'bottom');
    $fm->Button(@battr,
		-command => sub {$hosts_tl->destroy},
		-text => 'ok')->pack(-side => 'left', -padx => 10, -pady => 20);
    $fm->Button(@battr,
		-command => sub {$preselected_host = undef; $hosts_tl->destroy},
		-text => 'cancel')->pack(-side => 'left', -padx => 10, -pady => 20);
    $hosts_tl->update;
    my ($X, $Y) = ($mw->rootx, $mw->rooty);
    my ($w, $h) = ($hosts_tl->width, $hosts_tl->height);
    my ($W, $H) = ($mw->width, $mw->height);
    $x = $X + $W - $w if ($x + $w) > $X + $W;
    $y = $Y + $H - $h if ($y + $h) > $Y + $H;
    $hosts_tl->geometry('+'.$x.'+'.$y);
    $hosts_tl->waitWindow();
    return $preselected_host;
    
} # end hostsmenu

1;