package Slic3r::Polyline;
use strict;
use warnings;

use Math::Clipper qw();
use Scalar::Util qw(reftype);
use Slic3r::Geometry qw(A B X Y X1 X2 Y1 Y2 polyline_remove_parallel_continuous_edges polyline_remove_acute_vertices
    polyline_lines move_points same_point);

# the constructor accepts an array(ref) of points
sub new {
    my $class = shift;
    my $self;
    if (@_ == 1) {
        $self = [ @{$_[0]} ];
    } else {
        $self = [ @_ ];
    }
    
    bless $self, $class;
    bless $_, 'Slic3r::Point' for @$self;
    $self;
}

sub clone {
    my $self = shift;
    return (ref $self)->new(map $_->clone, @$self);
}

sub serialize {
    my $self = shift;
    return pack 'l*', map @$_, @$self;
}

sub deserialize {
    my $class = shift;
    my ($s) = @_;
    
    my @v = unpack '(l2)*', $s;
    return $class->new(map [ $v[2*$_], $v[2*$_+1] ], 0 .. int($#v/2));
}

sub is_serialized {
    my $self = shift;
    return (reftype $self) eq 'SCALAR' ? 1 : 0;
}

sub lines {
    my $self = shift;
    return polyline_lines($self);
}

sub boost_linestring {
    my $self = shift;
    return Boost::Geometry::Utils::linestring($self);
}

sub merge_continuous_lines {
    my $self = shift;
    polyline_remove_parallel_continuous_edges($self);
}

sub remove_acute_vertices {
    my $self = shift;
    polyline_remove_acute_vertices($self);
}

sub simplify {
    my $self = shift;
    my $tolerance = shift || 10;
    
    @$self = @{ Slic3r::Geometry::douglas_peucker($self, $tolerance) };
    bless $_, 'Slic3r::Point' for @$self;
}

sub reverse {
    my $self = shift;
    @$self = CORE::reverse @$self;
}

sub length {
    my $self = shift;
    my $length = 0;
    $length += $_->length for $self->lines;
    return $length;
}

# this only applies to polylines
sub grow {
    my $self = shift;
    return Slic3r::Polygon->new(@$self, CORE::reverse @$self[1..($#$self-1)])->offset(@_);
}

sub nearest_point_to {
    my $self = shift;
    my ($point) = @_;
    
    $point = Slic3r::Geometry::nearest_point($point, $self);
    return Slic3r::Point->new($point);
}

sub nearest_point_index_to {
    my $self = shift;
    my ($point) = @_;
    return Slic3r::Geometry::nearest_point_index($point, $self);
}

sub has_segment {
    my $self = shift;
    my ($line) = @_;
    
    for ($self->lines) {
        return 1 if $_->has_segment($line);
    }
    return 0;
}

sub clip_with_polygon {
    my $self = shift;
    my ($polygon) = @_;
    
    return $self->clip_with_expolygon(Slic3r::ExPolygon->new($polygon));
}

sub clip_with_expolygon {
    my $self = shift;
    my ($expolygon) = @_;
    
    my $result = Boost::Geometry::Utils::polygon_linestring_intersection(
        $expolygon->boost_polygon,
        $self->boost_linestring,
    );
    bless $_, 'Slic3r::Polyline' for @$result;
    bless $_, 'Slic3r::Point' for map @$_, @$result;
    return @$result;
}

sub bounding_box {
    my $self = shift;
    return Slic3r::Geometry::bounding_box($self);
}

sub size {
    my $self = shift;
    
    my @extents = $self->bounding_box;
    return [$extents[X2] - $extents[X1], $extents[Y2] - $extents[Y1]];
}

sub align_to_origin {
    my $self = shift;
    my @bb = $self->bounding_box;
    return $self->translate(-$bb[X1], -$bb[Y1]);
}

sub rotate {
    my $self = shift;
    my ($angle, $center) = @_;
    @$self = Slic3r::Geometry::rotate_points($angle, $center, @$self);
    bless $_, 'Slic3r::Point' for @$self;
    return $self;
}

sub translate {
    my $self = shift;
    my ($x, $y) = @_;
    @$self = Slic3r::Geometry::move_points([$x, $y], @$self);
    bless $_, 'Slic3r::Point' for @$self;
    return $self;
}

sub scale {
    my $self = shift;
    my ($factor) = @_;
    return if $factor == 1;
    
    # transform point coordinates
    foreach my $point (@$self) {
        $point->[$_] *= $factor for X,Y;
    }
    return $self;
}

1;