use strict;
use warnings;

use Test::More;

use DateTime::Format::Builder;

my %parsers = (
    parsers => {
        parse_datetime => {
            length => 8,
            regex  => qr/^abcdef$/,
            params => [qw( year month day )],
        }
    }
);

# Verify constructor (non-)creation

# Ensure we don't build a constructor when one isn't asked for
{
    my $class = 'SampleClass1';
    eval q[
    package SampleClass1;
    use DateTime::Format::Builder
        constructor => undef,
        %parsers;
    1;
    ];
    ok( !$@, "No errors when creating the class." );

    diag $@ if $@;

    {
        no strict 'refs';
        ok( !( *{"${class}::new"}{CV} ), "There is indeed no 'new'" );
    }

    my $parser = eval { $class->new() };
    ok( $@, "Error when trying to instantiate (no new)" );
    like(
        $@, qr/^Can't locate object method "new" via package "$class"/,
        "Right error"
    );
}

# Ensure we don't have people wiping out their constructors
{
    my $class = 'SampleClassHasNew';
    sub SampleClassHasNew::new { return "4" }
    eval q[
    package SampleClassHasNew;
    use DateTime::Format::Builder
        constructor => 1,
        %parsers;
    1;
    ];
    ok( $@, "Error when creating class." );
}

# Ensure we're not accidentally overriding when we don't itnend to.
{
    my $class = 'SampleClassDont';
    sub SampleClassDont::new { return "5" }
    eval q[
    package SampleClassDont;
    use DateTime::Format::Builder
        constructor => 0,
        %parsers;
    1;
    ];
    ok( !$@, "No error when creating class." );
    diag $@ if $@;

    my $parser = eval { $class->new() };
    is( $parser => 5, "Didn't override new()" );
}

# Ensure we use the given constructor
{
    my $class = 'SampleClassGiven';
    eval q[
    package SampleClassGiven;
    use DateTime::Format::Builder
        constructor => sub { return "6" },
        %parsers;
    1;
    ];
    ok( !$@, "No error when creating class." );
    diag $@ if $@;

    my $parser = eval { $class->new() };
    is( $parser => 6, "Used given new()" );
}

done_testing();