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#!perl 
use DAKKAR::p 'test';
 
use Enigmatic::Rotor;
use Enigmatic::Reflector;
use Enigmatic::RotorBox;
use Enigmatic::ReflectorBox;
use Enigmatic::CryptTrain;
 
subtest 'first position' => sub {
    my @in = 'A'..'Z';
 
    my @rots = map { Enigmatic::Rotor->new(@in->join) } 1..3;
    my $refl = Enigmatic::Reflector->new(@in->join);
    my $train = Enigmatic::CryptTrain->new({
        rotors => \@rots,
        reflector => $refl,
        positions => [0,0,0],
    });
 
    my $pos=0;
    for my $c ('A' .. 'Z') {
        is($train->map($c),
           $c,
           "identity train on $c");
        ++$pos;$pos%=26;
        is_deeply([$train->positions],
                  [$pos,0,0],
                  'no notches, only 1st moved');
    }
};
 
subtest 'some stepping' => sub {
    my @in = 'A'..'Z';
 
    my @rots = map { Enigmatic::Rotor->new({
        wiring => @in->join,
        notches => ['Z'],
    }) } 1..3;
    my $refl = Enigmatic::Reflector->new(@in->join);
    my $train = Enigmatic::CryptTrain->new({
        rotors => \@rots,
        reflector => $refl,
        positions => [0,0,0],
    });
 
    my $pos=0;
    for my $c ('A' .. 'Y') {
        $train->step_positions();
        ++$pos;
        is_deeply([$train->positions],
                  [$pos,0,0],
                  'single notch');
    }
    $train->step_positions();
    is_deeply([$train->positions],
              [0,1,0],
              'single notch');
};
 
sub _test_double_stepping {
    my ($train,$init,$steps) = @_;
 
    for my $rot (0..2) {
        $train->set_position($rot,$init->[$rot]);
    }
 
    for my $step_idx (0..$#$steps) {
        $train->step_positions();
 
        my $now_windows = $steps->[$step_idx];
        is_deeply([$train->rotor_windows],
                  $now_windows,
                  'correct step');
    }
}
 
subtest 'double-stepping' => sub {
    my $rotbox = Enigmatic::RotorBox->new();
    my $reflbox = Enigmatic::ReflectorBox->new();
 
    my $train = sub { Enigmatic::CryptTrain->new({
        rotors => [
            $rotbox->get('I'),
            $rotbox->get('II'),
            $rotbox->get('III'),
        ],
        reflector => $reflbox->get('B'),
    }) };
 
    _test_double_stepping($train->(),
                          [qw(O D K)],
                          [
                              [qw(P D K)],
                              [qw(Q D K)],
                              [qw(R E K)],
                              [qw(S F L)],
                              [qw(T F L)],
                          ]);
 
    $train = sub { Enigmatic::CryptTrain->new({
        rotors => [
            $rotbox->get('III'),
            $rotbox->get('II'),
            $rotbox->get('I'),
        ],
        reflector => $reflbox->get('B'),
    }) };
 
    _test_double_stepping($train->(),
                          [qw(T A A)],
                          [
                              [qw(U A A)],
                              [qw(V A A)],
                              [qw(W B A)],
                              [qw(X B A)],
                              [qw(Y B A)],
                          ]);
 
    _test_double_stepping($train->(),
                          [qw(T D A)],
                          [
                              [qw(U D A)],
                              [qw(V D A)],
                              [qw(W E A)],
                              [qw(X F B)],
                              [qw(Y F B)],
                          ]);
};
 
done_testing();