#!perl
use strict;
use warnings;
use Math::Matrix;
use Test::More tests => 24;
note('rot90()');
{
    my $x = Math::Matrix -> new([[1, 2, 3],
                                 [4, 5, 6]]);
    my $y = $x -> rot90();
    is(ref($y), 'Math::Matrix', '$y is a Math::Matrix');
    is_deeply([ @$y ], [[3, 6],
                        [2, 5],
                        [1, 4]], '$y has the right values');
    # Verify that modifying $y does not modify $x.
    my ($nrowy, $ncoly) = $y -> size();
    for my $i (0 .. $nrowy - 1) {
        for my $j (0 .. $ncoly - 1) {
            $y -> [$i][$j] += 100;
        }
    }
    is_deeply([ @$x ], [[1, 2, 3],
                        [4, 5, 6]], '$x is unmodified');
}
note('rot90(0)');
{
    my $x = Math::Matrix -> new([[1, 2, 3],
                                 [4, 5, 6]]);
    my $y = $x -> rot90(0);
    is(ref($y), 'Math::Matrix', '$y is a Math::Matrix');
    is_deeply([ @$y ], [[1, 2, 3],
                        [4, 5, 6]], '$y has the right values');
    # Verify that modifying $y does not modify $x.
    my ($nrowy, $ncoly) = $y -> size();
    for my $i (0 .. $nrowy - 1) {
        for my $j (0 .. $ncoly - 1) {
            $y -> [$i][$j] += 100;
        }
    }
    is_deeply([ @$x ], [[1, 2, 3],
                        [4, 5, 6]], '$x is unmodified');
}
note('rot90(1)');
{
    my $x = Math::Matrix -> new([[1, 2, 3],
                                 [4, 5, 6]]);
    my $y = $x -> rot90(1);
    is(ref($y), 'Math::Matrix', '$y is a Math::Matrix');
    is_deeply([ @$y ], [[3, 6],
                        [2, 5],
                        [1, 4]], '$y has the right values');
    # Verify that modifying $y does not modify $x.
    my ($nrowy, $ncoly) = $y -> size();
    for my $i (0 .. $nrowy - 1) {
        for my $j (0 .. $ncoly - 1) {
            $y -> [$i][$j] += 100;
        }
    }
    is_deeply([ @$x ], [[1, 2, 3],
                        [4, 5, 6]], '$x is unmodified');
}
note('rot90(2)');
{
    my $x = Math::Matrix -> new([[1, 2, 3],
                                 [4, 5, 6]]);
    my $y = $x -> rot90(2);
    is(ref($y), 'Math::Matrix', '$y is a Math::Matrix');
    is_deeply([ @$y ], [[6, 5, 4],
                        [3, 2, 1]], '$y has the right values');
    # Verify that modifying $y does not modify $x.
    my ($nrowy, $ncoly) = $y -> size();
    for my $i (0 .. $nrowy - 1) {
        for my $j (0 .. $ncoly - 1) {
            $y -> [$i][$j] += 100;
        }
    }
    is_deeply([ @$x ], [[1, 2, 3],
                        [4, 5, 6]], '$x is unmodified');
}
note('rot90(3)');
{
    my $x = Math::Matrix -> new([[1, 2, 3],
                                 [4, 5, 6]]);
    my $y = $x -> rot90(3);
    is(ref($y), 'Math::Matrix', '$y is a Math::Matrix');
    is_deeply([ @$y ], [[4, 1],
                        [5, 2],
                        [6, 3]], '$y has the right values');
    # Verify that modifying $y does not modify $x.
    my ($nrowy, $ncoly) = $y -> size();
    for my $i (0 .. $nrowy - 1) {
        for my $j (0 .. $ncoly - 1) {
            $y -> [$i][$j] += 100;
        }
    }
    is_deeply([ @$x ], [[1, 2, 3],
                        [4, 5, 6]], '$x is unmodified');
}
note('rot90() with empty matrix');
{
    my $x = Math::Matrix -> new([]);
    my $y = $x -> rot90();
    is(ref($y), 'Math::Matrix', '$y is a Math::Matrix');
    is_deeply([ @$y ], [], '$y has the right values');
    is_deeply([ @$x ], [], '$x is unmodified');
}
note('rot90([[1]])');
{
    my $x = Math::Matrix -> new([[1, 2, 3],
                                 [4, 5, 6]]);
    my $y = $x -> rot90([[1]]);
    is(ref($y), 'Math::Matrix', '$y is a Math::Matrix');
    is_deeply([ @$y ], [[3, 6],
                        [2, 5],
                        [1, 4]], '$y has the right values');
    # Verify that modifying $y does not modify $x.
    my ($nrowy, $ncoly) = $y -> size();
    for my $i (0 .. $nrowy - 1) {
        for my $j (0 .. $ncoly - 1) {
            $y -> [$i][$j] += 100;
        }
    }
    is_deeply([ @$x ], [[1, 2, 3],
                        [4, 5, 6]], '$x is unmodified');
}
note('rot90(Math::Matrix -> new([[1]]))');
{
    my $x = Math::Matrix -> new([[1, 2, 3],
                                 [4, 5, 6]]);
    my $y = $x -> rot90(Math::Matrix -> new([[1]]));
    is(ref($y), 'Math::Matrix', '$y is a Math::Matrix');
    is_deeply([ @$y ], [[3, 6],
                        [2, 5],
                        [1, 4]], '$y has the right values');
    # Verify that modifying $y does not modify $x.
    my ($nrowy, $ncoly) = $y -> size();
    for my $i (0 .. $nrowy - 1) {
        for my $j (0 .. $ncoly - 1) {
            $y -> [$i][$j] += 100;
        }
    }
    is_deeply([ @$x ], [[1, 2, 3],
                        [4, 5, 6]], '$x is unmodified');
}