use strict;
use Test::More;
use Test::Deep;
use t::common qw( new_dbm );

use_ok( 'DBM::Deep' );

my $dbm_factory = new_dbm(
    locking   => 1,
    autoflush => 1,
    num_txns  => 2,
);
while ( my $dbm_maker = $dbm_factory->() ) {
    my $db1 = $dbm_maker->();
    next unless $db1->supports('transactions');
    my $db2 = $dbm_maker->();

    $db1->{x} = { xy => { foo => 'y' } };
    is( $db1->{x}{xy}{foo}, 'y', "Before transaction, DB1's X is Y" );
    is( $db2->{x}{xy}{foo}, 'y', "Before transaction, DB2's X is Y" );

    cmp_bag( [ keys %$db1 ], [qw( x )], "DB1 keys correct" );
    cmp_bag( [ keys %$db2 ], [qw( x )], "DB2 keys correct" );

    cmp_bag( [ keys %{$db1->{x}} ], [qw( xy )], "DB1->X keys correct" );
    cmp_bag( [ keys %{$db2->{x}} ], [qw( xy )], "DB2->X keys correct" );

    cmp_bag( [ keys %{$db1->{x}{xy}} ], [qw( foo )], "DB1->X->XY keys correct" );
    cmp_bag( [ keys %{$db2->{x}{xy}} ], [qw( foo )], "DB2->X->XY keys correct" );

    $db1->begin_work;

        cmp_bag( [ keys %$db1 ], [qw( x )], "DB1 keys correct" );
        cmp_bag( [ keys %$db2 ], [qw( x )], "DB2 keys correct" );

        cmp_bag( [ keys %{$db1->{x}} ], [qw( xy )], "DB1->X keys correct" );
        cmp_bag( [ keys %{$db2->{x}} ], [qw( xy )], "DB2->X keys correct" );

        cmp_bag( [ keys %{$db1->{x}{xy}} ], [qw( foo )], "DB1->X->XY keys correct" );
        cmp_bag( [ keys %{$db2->{x}{xy}} ], [qw( foo )], "DB2->X->XY keys correct" );

        is( $db1->{x}{xy}{foo}, 'y', "After transaction, DB1's X is Y" );
        is( $db2->{x}{xy}{foo}, 'y', "After transaction, DB2's X is Y" );

        $db1->{x} = { yz => { bar => 30 } };
        ok( !exists $db1->{x}{xy}, "DB1: After reassignment of X, X->XY is gone" );
        is( $db2->{x}{xy}{foo}, 'y', "DB2: After reassignment of DB1 X, X is Y" );

        cmp_bag( [ keys %{$db1->{x}} ], [qw( yz )], "DB1->X keys correct" );
        cmp_bag( [ keys %{$db2->{x}} ], [qw( xy )], "DB2->X keys correct" );

    $db1->rollback;

    cmp_bag( [ keys %$db1 ], [qw( x )], "DB1 keys correct" );
    cmp_bag( [ keys %$db2 ], [qw( x )], "DB2 keys correct" );

    cmp_bag( [ keys %{$db1->{x}} ], [qw( xy )], "DB1->X keys correct" );
    cmp_bag( [ keys %{$db2->{x}} ], [qw( xy )], "DB2->X keys correct" );

    cmp_bag( [ keys %{$db1->{x}{xy}} ], [qw( foo )], "DB1->X->XY keys correct" );
    cmp_bag( [ keys %{$db2->{x}{xy}} ], [qw( foo )], "DB2->X->XY keys correct" );

    is( $db1->{x}{xy}{foo}, 'y', "Before transaction, DB1's X is Y" );
    is( $db2->{x}{xy}{foo}, 'y', "Before transaction, DB2's X is Y" );

    $db1->begin_work;

        cmp_bag( [ keys %$db1 ], [qw( x )], "DB1 keys correct" );
        cmp_bag( [ keys %$db2 ], [qw( x )], "DB2 keys correct" );

        cmp_bag( [ keys %{$db1->{x}} ], [qw( xy )], "DB1->X keys correct" );
        cmp_bag( [ keys %{$db2->{x}} ], [qw( xy )], "DB2->X keys correct" );

        cmp_bag( [ keys %{$db1->{x}{xy}} ], [qw( foo )], "DB1->X->XY keys correct" );
        cmp_bag( [ keys %{$db2->{x}{xy}} ], [qw( foo )], "DB2->X->XY keys correct" );

        is( $db1->{x}{xy}{foo}, 'y', "After transaction, DB1's X is Y" );
        is( $db2->{x}{xy}{foo}, 'y', "After transaction, DB2's X is Y" );

        $db1->{x} = { yz => { bar => 30 } };
        ok( !exists $db1->{x}{xy}, "DB1: After reassignment of X, X->XY is gone" );
        is( $db2->{x}{xy}{foo}, 'y', "DB2: After reassignment of DB1 X, X->YZ is Y" );

        cmp_bag( [ keys %{$db1->{x}} ], [qw( yz )], "DB1->X keys correct" );
        cmp_bag( [ keys %{$db2->{x}} ], [qw( xy )], "DB2->X keys correct" );

    $db1->commit;

    cmp_bag( [ keys %$db1 ], [qw( x )], "DB1 keys correct" );
    cmp_bag( [ keys %$db2 ], [qw( x )], "DB2 keys correct" );

    cmp_bag( [ keys %{$db1->{x}} ], [qw( yz )], "DB1->X keys correct" );
    cmp_bag( [ keys %{$db2->{x}} ], [qw( yz )], "DB2->X keys correct" );

    cmp_bag( [ keys %{$db1->{x}{yz}} ], [qw( bar )], "DB1->X->XY keys correct" );
    cmp_bag( [ keys %{$db2->{x}{yz}} ], [qw( bar )], "DB2->X->XY keys correct" );
}

done_testing;