use Test::More tests => 9;
use strict;
use warnings;

BEGIN {
    use FindBin;
    use lib "$FindBin::Bin/../lib";
    use local::lib "$FindBin::Bin/../local-lib";
}

use List::Util qw(first sum);
use Slic3r;
use Slic3r::Test qw(_eq);
use Slic3r::Geometry qw(Z PI scale unscale);

use Devel::Peek;

my $config = Slic3r::Config->new_from_defaults;

my $generate_gcode = sub {
    my ($conf) = @_;
    $conf ||= $config;
    
    my $print = Slic3r::Test::init_print('slopy_cube', config => $conf);
    
    my @z = ();
    my @increments = ();
    Slic3r::GCode::Reader->new->parse(Slic3r::Test::gcode($print), sub {
        my ($self, $cmd, $args, $info) = @_;
        
        if ($info->{dist_Z}) {
            push @z, 1*$args->{Z};
            push @increments, $info->{dist_Z};
        }
    });
    
    return (@z);
};

my $horizontal_feature_test = sub {
    my (@z) = $generate_gcode->();
    
    ok  (_eq($z[0], $config->get_value('first_layer_height') + $config->z_offset), 'first layer height.');
    
    ok  (_eq($z[1], $config->get_value('first_layer_height') + $config->get('max_layer_height')->[0] + $config->z_offset), 'second layer height.');
        
    cmp_ok((first { _eq($_, 10.0) } @z[1..$#z]), '>', 0, 'horizontal facet matched');
    
    1;
};

my $height_gradation_test = sub {
    my (@z) = $generate_gcode->();

    my $gradation = 1 / $config->get('z_steps_per_mm');
    # +1 is a "dirty fix" to avoid rounding issues with the modulo operator...
    my @results = map {unscale((scale($_)+1) % scale($gradation))} @z;

    ok  (_eq(sum(@results), 0), 'layer z is multiple of gradation ' . $gradation );
    
    1;
};


my $adaptive_slicing = Slic3r::SlicingAdaptive->new();
my $mesh = Slic3r::Test::mesh('slopy_cube');
$adaptive_slicing->add_mesh($mesh);
$adaptive_slicing->prepare(20);


subtest 'max layer_height limited by extruder capabilities' => sub {
    plan tests => 3;

    ok  (_eq($adaptive_slicing->next_layer_height(1, 20, 0.1, 0.15), 0.15), 'low');
    ok  (_eq($adaptive_slicing->next_layer_height(1, 20, 0.1, 0.4), 0.4), 'higher');
    ok  (_eq($adaptive_slicing->next_layer_height(1, 20, 0.1, 0.65), 0.65), 'highest');
};
  
subtest 'min layer_height limited by extruder capabilities' => sub {
    plan tests => 3;

    ok  (_eq($adaptive_slicing->next_layer_height(4, 99, 0.1, 0.15), 0.1), 'low');
    ok  (_eq($adaptive_slicing->next_layer_height(4, 98, 0.2, 0.4), 0.2), 'higher');
    ok  (_eq($adaptive_slicing->next_layer_height(4, 99, 0.3, 0.65), 0.3), 'highest');
};

subtest 'correct layer_height depending on the facet normals' => sub {
    plan tests => 3;

    ok  (_eq($adaptive_slicing->next_layer_height(1, 10, 0.1, 0.5), 0.5), 'limit');
    ok  (_eq($adaptive_slicing->next_layer_height(4, 80, 0.1, 0.5), 0.1546), '45deg facet, quality_value: 0.2');
    ok  (_eq($adaptive_slicing->next_layer_height(4, 50, 0.1, 0.5), 0.3352), '45deg facet, quality_value: 0.5');
};


# 2.92893 ist lower slope edge
# distance to slope must be higher than min extruder cap.
# slopes layer height must be greater than the distance to the slope
ok  (_eq($adaptive_slicing->next_layer_height(2.798, 80, 0.1, 0.5), 0.1546), 'reducing layer_height due to higher slopy facet');

# slopes layer height must be smaller than the distance to the slope
ok  (_eq($adaptive_slicing->next_layer_height(2.6289, 85, 0.1, 0.5), 0.3), 'reducing layer_height to z-diff');

subtest 'horizontal planes' => sub {
    plan tests => 3;

    ok  (_eq($adaptive_slicing->horizontal_facet_distance(1, 1.2), 1.2), 'max_height limit');
    ok  (_eq($adaptive_slicing->horizontal_facet_distance(8.5, 4), 1.5), 'normal horizontal facet');
    ok  (_eq($adaptive_slicing->horizontal_facet_distance(17, 5), 3.0), 'object maximum');
};

# shrink current layer to fit another layer under horizontal facet
$config->set('start_gcode', '');  # to avoid dealing with the nozzle lift in start G-code
$config->set('z_offset', 0);

$config->set('adaptive_slicing', 1);
$config->set('first_layer_height', 0.42893); # to catch lower slope edge
$config->set('nozzle_diameter', [0.5]);
$config->set('min_layer_height', [0.1]);
$config->set('max_layer_height', [0.5]);
$config->set('adaptive_slicing_quality', [81]);
# slope height: 7,07107 (2.92893 to 10)

subtest 'shrink to match horizontal facets' => sub {
    plan skip_all => 'spline smoothing currently prevents exact horizontal facet matching';
    plan tests => 3;
    $horizontal_feature_test->();
};
    
# widen current layer to match horizontal facet
$config->set('adaptive_slicing_quality', [0.1]);

subtest 'widen to match horizontal facets' => sub {
    plan skip_all => 'spline smoothing currently prevents exact horizontal facet matching';
    plan tests => 3;
    $horizontal_feature_test->();
};

subtest 'layer height gradation' => sub {
    plan tests => 5;
    foreach my $gradation (1/0.001, 1/0.01, 1/0.02, 1/0.05, 1/0.08) {
        $config->set('z_steps_per_mm', $gradation);
        $height_gradation_test->();
    }
};

__END__