#!/usr/bin/perl

require "getopts.pl";
require "morph.ph"; 
require "funcs.ph";

use strict;
use rhino_parse;
use gcode_write;
use polygon;
use File::Copy;
use HTTP::Request::Common;
use LWP::UserAgent;
use LWP::Simple;

# ./toolpath.pl -u laptop -i tmp1.3dm -d tmp2.3dm -r -g thing.ngc
#    or
# ./toolpath.pl -c config.file 
# tour methods 
#    salesman
#    grid_tour
#    line_tour

&Getopts('c:g:i:d:u:vp:P:r');

use vars qw($opt_P $opt_c $opt_i $opt_g $opt_d $opt_p $opt_u $opt_r $global);

my ($global);

my ($second, $minute, $hour) = localtime();

$global->{'total_salesman'} = 0;
$global->{'clock_time'} = "$hour:$minute:$second";
$global->{'verbose'} = 1;
$global->{'tour_executable'} = "/usr/bin/LKH.UNIX";
$global->{'gcode_deposit_dir'} = "/home/owhite/emc2-head/configs/laser_new/nc_files";
$global->{'default_move_feed_rate'} = 30;
$global->{'default_cut_feed_rate'} = 10;
$global->{'tag'} = "";

my $post_method = "catch_post.pl";
my $cuts_layer = "CUTS";
my $parts_layer = "PARTS";
my $path_layer = "PATH";
my $tour_method = "salesman";

my (%config, $input_file, $gcode_prefix, $dump_file, $base_url);

# opt start...

if (length($opt_p) > 0) {
    $post_method = $opt_p;
}

if (length($opt_c) > 0) {
    # config file
    open(F_IN, "$opt_c") || die("cant open: $opt_c");
    while(<F_IN>) {
	s/\n//;
	s/\s//g;
	if (/(.*)::(.*)/) {
	    $config{$1} = $2;
	}
    }
    close(F_IN);
}

if (length($opt_u) > 0) {
    $base_url = $opt_u;
}
elsif (length($config{'base_url'}) > 0) {
    $base_url = $config{'base_url'};
}
else {
    die "must supply a url with -u for the LWP::Simple->get";
}

if(length($opt_i) > 0) {
    $input_file = $opt_i;
} 
elsif (length($config{'input_file'}) > 0) {
    $input_file = $config{'input_file'};

}
else {
    die "must supply an input file with -i";
}


$global->{'ignore_not_modified'}= $opt_r;

$gcode_prefix = $config{'gcode_prefix'};
if (length($opt_g) > 0) {
    $gcode_prefix = $opt_g;
}

$dump_file = $config{'dump_file'};
if (length($opt_d) > 0) {
    $dump_file = $opt_d;
}

$global->{'t_str'} = "";

toolpath( $base_url, $post_method, $input_file, $gcode_prefix, $cuts_layer, $path_layer, $tour_method, $dump_file);

print $global->{'t_str'};


# --------------------------------------------------

sub toolpath {

    ($base_url, 
     $post_method, 
     $input_file, 
     $gcode_prefix, 
     $cuts_layer, 
     $path_layer, 
     $tour_method, 
     $dump_file) = @_;

    my $start_time = time();

    fetch_file_from_url($base_url, $input_file);

    my $file_struct = rhino_parse->new($input_file);
    my $polyline_struct = polygon->new();
    $polyline_struct->set($file_struct);
    my $dump = rhino_parse->new();
    $dump->add_layer($cuts_layer, "255 0 0");
    $dump->add_layer($parts_layer, "0 0 255");
    $dump->add_layer($path_layer, "0 255 0");

    my $user_part_path;
    my $gcode;
    if (length($gcode_prefix) > 0) {
	$gcode = gcode_write->new(1,$global);
    }

    my $points;

    my $count = 0;
    my $parts = polygon->new();
    foreach my $p ($polyline_struct->polylines_by_layer($parts_layer)) {
	$parts->add($polyline_struct->{$p});
	$points->{$count}->{'x'} = $polyline_struct->{$p}->{0}->{'x'};
	$points->{$count}->{'y'} = $polyline_struct->{$p}->{0}->{'y'};
	$count++;
    }
    $points->{'count'} = $count;

    my $cuts = polygon->new();
    foreach my $p ($polyline_struct->polylines_by_layer($cuts_layer)) {
	$cuts->add($polyline_struct->{$p});
    }

    my($user_part_path) = $polyline_struct->get_vertices_by_layer($path_layer);

    my @tour = create_tour(points => $points,
			   tour_method => $tour_method,
			   part_path => $user_part_path,
			   parts => $parts,
			   origin_x => 0,
			   origin_y => 0);

    if ($cuts->polyline_is_clockwise2d($points)) {
	my @l = @tour;
	@tour = (shift(@l), reverse(@l));
    }

    if ($parts->{'count'} != 0) {

	cut_parts($dump, $parts, $cuts, \@tour, $gcode, $polyline_struct);

	write_part_tour($dump, $points, @tour) if (length($dump_file) > 0);

	if (defined($gcode)) {
	    $global->{'tag'} = $gcode->write_gcode($gcode_prefix, $global->{'clock_time'});

	    move($gcode_prefix, $global->{'gcode_deposit_dir'} . "/" . $gcode_prefix);
	}
    } 
    else {
	$global->{'t_str'} .= "ERROR: got no parts to cut on layer: $parts_layer" 
	}

    if (length($dump_file) > 0) {

	$dump->dump_file($dump_file);

	my $server_url = "http://" . $base_url . "/cgi-bin/" . $post_method;

	my $ua =  LWP::UserAgent->new;

	my $response = $ua->request(
				    POST $server_url,
				    Content_Type => 'form-data',
				    Content      => [ name  => $dump_file,
						      bindata => [$dump_file],
						      ]
				    );

	if ( $response->is_success ) {
	    $global->{'t_str'} .= "request to $post_method worked" if ($global->{'verbose'} != 0);
	} else {
	    $global->{'t_str'} .= "ERROR: request to $server_url did not work\n";
	}

    }

    $global->{'t_str'} .= "look for this tag:: " if ($global->{'verbose'} != 0);

    $global->{'t_str'} .= "$global->{'tag'}\n";

}

sub fetch_file_from_url {
    my($base, $input_file) = @_;

    my $url = "http://" . $base . "/" . $input_file;

    my $content = get($url);

    die "Couldnt get $url -- is the server on?" unless defined $content;

    if (mirror($url, $input_file) == RC_NOT_MODIFIED) {
	$global->{'t_str'} .= "file $input_file was not modified\n" if ($global->{'verbose'} != 0);
	if (length($global->{'ignore_not_modified'}) > 0) {
	    $global->{'t_str'} .= "reusing: $input_file\n" if ($global->{'verbose'} != 0);
	}
	else {
	    exit(1);
	}
    }
    else {
	$global->{'t_str'} .= "file $input_file was modified\n" if ($global->{'verbose'} != 0);
    }
}

sub cut_parts {
  my($dump, $parts, $cuts, $tour, $gcode, $polyline_struct) = @_;

  my $done;
  foreach my $part (@$tour) {

      $global->{'t_str'} .= " part: $part\n" if ($global->{'verbose'} != 0);
	
      my $cut_set = polygon->new();
      my $points;

    my $count = 0;
    foreach my $c (polylines_overlap_polyline($cuts, 
					      $parts->{$part}, 
					      $polyline_struct)) {
      if ($done->{$c} != 1) {
	$points->{$count}->{'x'} = $cuts->{$c}->{0}->{'x'};
	$points->{$count}->{'y'} = $cuts->{$c}->{0}->{'y'};
	$points->{$count}->{'part_number'} = $c;
	$count++;
      } else {
	# for some reason cuts get found more than once.
      }
      $done->{$c} = 1;
    }
    $points->{'count'} = $count;

    my $x = $parts->{$part}->{$parts->{$part}->{'count'}-1}->{'x'};
    my $y = $parts->{$part}->{$parts->{$part}->{'count'}-1}->{'y'};

    if ($points->{'count'} > 0) {
      $global->{'t_str'} .= "  Creating part path... $count cuts\n" if ($global->{'verbose'} != 0);
      my @l = create_tour(points => $points,
			  tour_method => "salesman",
			  origin_x => $x,
			  origin_y => $y);

      $global->{'t_str'} .= "  ...done\n" if ($global->{'verbose'} != 0);
	    
      foreach my $p (@l) {
	my $ptr = $cuts->{$points->{$p}->{'part_number'}};
	$dump->add_polygon($ptr, "CUTS") if (length($dump_file) > 0); 
	$gcode->write_gcode_polyline($ptr) if (defined($gcode));
      }

      write_part_tour($dump, $points, @l) if (length($dump_file) > 0);

    } 
    else {
	$global->{'t_str'} .= "  no cuts in part: $part\n" if ($global->{'verbose'} != 0);
    }

    $dump->add_polygon($parts->{$part}, "PARTS") if (length($dump_file) > 0); 
    $gcode->write_gcode_polyline($parts->{$part}) if (defined($gcode));
  }

  return($done);
}

sub _get_distance {
  my ($x1, $y1, $x2, $y2) = @_;

  my $xdistance=abs(($x1-$x2)*($x1-$x2));
  my $ydistance=abs(($y1-$y2)*($y1-$y2));

  return (sqrt($xdistance+$ydistance));
}

sub write_part_tour {
  my($dump, $pts, @l) = @_;

  my $count = 0;
  my $path;
  foreach my $part (@l) {

    $path->{$count}->{'x'} = $pts->{$part}->{'x'};
    $path->{$count}->{'y'} = $pts->{$part}->{'y'};
    $path->{$count}->{'z'} = 0;

    $count++;

  }
  $path->{'count'} = $count;

  $dump->add_polygon($path, "PATH");
}


sub polylines_overlap_polyline {
  my($polylines, $part, $polyline_struct) = @_;
  my (@l);

  for (my $j=0; $j < $polylines->{'count'}; $j++) {

    my $ptr = $polylines->{$j};

    if ($polyline_struct->polyline_overlaps($ptr, $part)) {
      push(@l, $j);
    }

  }

  return(@l);
}

sub name_gcodefile {
  my($n, $count) = @_;
    
  if ($n =~ /(\..*)/) {
    my $ext = $1;
    $n =~ s/\..*//;
    $n = $n . "_" . $count . $ext;
  } else {
    die ("was expecting some type of extension in gcode file name (e.g., \".ngc\")");
  }

  return($n);
}

sub create_tour {
  my $opts;
  while (@_ && !ref $_[0]) {   
    my $key     = shift;
    $opts->{$key} = shift;
  }

  my $points = $opts->{points};
  $global->{'t_str'} .= "ERROR no points sent to create_tour\n" unless $points;

  if ($opts->{part_path}) {
    $opts->{tour_method} = "line_tour";
  }
  my $tour_method = $opts->{tour_method};
  $global->{'t_str'} .= "ERROR no method sent to create_tour" unless $tour_method;

  my @l;
  if ($tour_method eq "salesman") {
    @l = create_salesman_tour($points);
  } elsif ($tour_method eq "line_tour") {
    @l = tour_parts_by_line($opts);
  } else {
    @l = create_dumb_tour($points);
  }
    
  if (length($opts->{origin_x}) > 0 && length($opts->{origin_y}) > 0) {
    @l = rotate_loop($opts->{origin_x}, $opts->{origin_y}, $points, @l);
  }

  return(@l);
}

sub rotate_loop {
  my($x, $y, $points, @list) = @_;
  my ($i, $item, $d1, $d2, $count);

  my $d2 = _get_distance($x,$y,$points->{0}->{'x'},$points->{0}->{'y'});

  $item = 0;

  $count = 0;
  foreach $i (@list) {
    $d1 = _get_distance($x,$y,
			$points->{$i}->{'x'},
			$points->{$i}->{'y'});

    if ($d1 < $d2) {
      $item = $count;
	$d2 = $d1;
    }
    $count++;
  }
  
  my @l;
  for($i=$item; $i<$points->{'count'}; $i++) {
    push(@l, $list[$i]);
  }
  for($i=0; $i<$item; $i++) {
    push(@l, $list[$i]);
  }

  return(@l);
}

sub tour_parts_by_line {
  my $opts = shift;

  my $path = $opts->{part_path};
$global->{'t_str'} .= "ERROR no part_path sent to tour_parts_by_line" unless $path;

  my $parts = $opts->{parts};
$global->{'t_str'} .= "ERROR no parts sent to tour_parts_by_line" unless $parts;
  my $self = $opts->{parts};

  my ($line, $done, @list);
  for (my $i=0;$i<$path->{'count'}-1;$i++) {

    $line->{0}->{'x'} = $path->{$i}->{'x'};
    $line->{0}->{'y'} = $path->{$i}->{'y'};
	$line->{1}->{'x'} = $path->{$i + 1}->{'x'};
	$line->{1}->{'y'} = $path->{$i + 1}->{'y'};
	$line->{'count'} = 2;

	my $x = $line->{0}->{'x'};
	my $y = $line->{0}->{'y'};

	my @tmp;
	for(my $j=0;$j<$parts->{'count'};$j++) {
	    if ($done->{$j} != 1) {
		my $ptr = $parts->{$j};
		my $box = _get_bounding_box($ptr);
		my $r = $self->polyline_crosses($line, $box);
		if ($r) {
		    my $dist = _get_nearest_dist($x, $y, $r);
		    push(@tmp, $dist . " " . $j);
		    $done->{$j} = 1;
		}
	    }
	}

	foreach my $e (sort by_number (@tmp)) {
	    $e =~ s/.* //;
	    push(@list, $e);
	}
    }

    return(@list);
}

sub _get_nearest_dist {
    my($x, $y, $ptr) = @_;

    my ($i, $d_sq);
    my $rot   = 0;
    my $dmin_sq = sqrt(($ptr->{0}->{'x'}-$x)**2 + ($ptr->{0}->{'y'}-$y)**2);

    for(my $i=0; $i < $ptr->{'count'}; $i++) {

	$d_sq = sqrt(($ptr->{$i}->{'x'}-$x)**2 + ($ptr->{$i}->{'y'}-$y)**2);

	$dmin_sq = min($dmin_sq, $d_sq);
    }

    return($dmin_sq);
}

sub _get_bounding_box {
    my $p = shift;
    my $b;

    $b->{0}->{'x'} = $p->{'min_x'};
    $b->{0}->{'y'} = $p->{'min_y'};

    $b->{1}->{'x'} = $p->{'max_x'};
    $b->{1}->{'y'} = $p->{'min_y'};

    $b->{2}->{'x'} = $p->{'max_x'};
    $b->{2}->{'y'} = $p->{'max_y'};

    $b->{3}->{'x'} = $p->{'min_x'};
    $b->{3}->{'y'} = $p->{'max_y'};

    $b->{4}->{'x'} = $p->{'min_x'};
    $b->{4}->{'y'} = $p->{'min_y'};

    $b->{'count'} = 5;
    return($b);
}


sub dump_polyline_struct {
    my ($s) = shift;
    for(my $j=0; $j < $s->{'count'}; $j++) {
	$global->{'t_str'} .= "LINE: $j\n"  if ($global->{'verbose'} != 0);
	dump_vector($s->{$j});
    }
}


sub dump_vector {
    my ($p) = shift;
    for(my $j=0; $j < $p->{'count'}; $j++) {
	$global->{'t_str'} .= "$j :: $p->{$j}->{'x'} :: $p->{$j}->{'y'}\n" if ($global->{'verbose'} != 0);
    }
}

sub create_dumb_tour {
    my($points) = @_;

    # deal with situations with small number of datapoints
    if ($points->{'count'} == 1) {
	return(0);
    }

    if ($points->{'count'} == 0) {
	$global->{'t_str'} .= "ERROR call to create tour with polyline containing no points\n";
	exit(1);
    }

    my @l;
    my $i;
    for($i=0;$i<$points->{'count'};$i++) {
	push (@l, $points->{$i}->{'x'} . " " . $i);
    }

    my(@l2);
    foreach $i (sort by_number (@l)) {
	$i =~ s/.* //;
	push(@l2, $i);
    }

    return(@l2);
}

# This traveling salesman solution (LKH.UNIX) thanks to Keld Helsgaun.
#    http://www.akira.ruc.dk/~keld/
sub create_salesman_tour {
    my($points) = @_;

    # deal with situations with small number of datapoints
    if ($points->{'count'} == 1) {
	return(0);
    }

    my $start_time = time();

    my $param_file = "tmp_param_file";
    my $input_file = "tmp_input_file";
    my $output_file = "tmp_output_file";

    open(PAR_FILE,">$param_file") || die("cant write file: $param_file");
    print PAR_FILE "PROBLEM_FILE = $input_file\n";
    print PAR_FILE "TOUR_FILE = $output_file\n";
    close(PAR_FILE);

    if ($points->{'count'} == 0) {
	$global->{'t_str'} .=  "ERROR call to create tour with polyline containing no points\n";
    }
    if ($points->{'count'} == 2) {
	return(0,1);
    }

    open(F_OUT, ">$input_file") || die("cant write: $input_file");
    print F_OUT "NAME : inputfile\n";
    print F_OUT "TYPE : TSP\n";
    print F_OUT "COMMENT : COMMENT\n";
    print F_OUT "DIMENSION : $points->{'count'}\n";
    print F_OUT "EDGE_WEIGHT_TYPE : EUC_2D\n";
    print F_OUT "NODE_COORD_SECTION\n";

    my ($t1, $t2);
    if ($points->{'count'} > 120) {
	$global->{'t_str'} .= "ERROR Be advised: the toolpath is processing $points->{'count'} points. Lists with\n";
	$global->{'t_str'} .= "ERROR  that many vertices require a bit of a wait.\n";
	$t1 = time();
    }
    
    my $i;
    for($i=0;$i<$points->{'count'};$i++) {
	printf F_OUT ("%d %lf %lf\n",
		      $i+1,
		      $points->{$i}->{'x'},
		      $points->{$i}->{'y'});
    }

    print F_OUT "EOF\n";
    close(F_OUT);

    my $cmd = "echo $param_file | $global->{'tour_executable'} > /dev/null";
    system($cmd);

    my(@l);
    my $start = 0;
    open(F_IN, "$output_file") || die("cant open: $output_file");
    while(<F_IN>) {

	s/\n//;

	$start = 0 if(/-1/);
	if ($start == 1) {
	    my $n = int($_-1);
	    push(@l,$n); 
	}
	$start = 1 if(/TOUR_SECTION/);
    }

    close(F_IN);

    if (length($t1) > 0) {
	$t2 = time();
	$global->{'t_str'} .= ("WARNING:  %d seconds TSP time\n", $t2 - $t1);
    }

    unlink($param_file);
    unlink($input_file);
    unlink($output_file);

    my $end = time();

    $global->{'total_salesman'} += ($end - $start_time);

    return(@l);
}