#!/usr/bin/perl

use strict;
use warnings;

use Test::More;

# Skip the test before Method::Signatures can try to compile it and blow up.
BEGIN {
    plan skip_all => "Perl 5.10 or higher required to test where constraints" if $] < 5.010;
}

{
    package Stuff;

    use Test::More;
    use Method::Signatures;

    method add($this //= 23, $that //= 42) {
        return $this + $that;
    }

    method minus($this is ro //= 23, $that is ro //= 42) {
        return $this - $that;
    }

    is( Stuff->add(),      23 + 42 );
    is( Stuff->add(undef), 23 + 42 );
    is( Stuff->add(99),    99 + 42 );
    is( Stuff->add(2,3),   5 );

    is( Stuff->minus(),         23 - 42 );
    is( Stuff->minus(undef),     23 - 42 );
    is( Stuff->minus(99),       99 - 42 );
    is( Stuff->minus(2, 3),     2 - 3 );


    # Test again that undef doesn't override defaults
    method echo($message //= "what?") {
        return $message
    }

    is( Stuff->echo(),          "what?" );
    is( Stuff->echo(undef),     "what?" );
    is( Stuff->echo("who?"),    'who?'  );


    # Test that you can reference earlier args in a default
    method copy_cat($this, $that //= $this) {
        return $that;
    }

    is( Stuff->copy_cat("wibble"), "wibble" );
    is( Stuff->copy_cat("wibble", undef), "wibble" );
    is( Stuff->copy_cat(23, 42),   42 );
}

{
    package Bar;
    use Test::More;
    use Method::Signatures;

    method hello($msg //= "Hello, world!") {
        return $msg;
    }

    is( Bar->hello,               "Hello, world!" );
    is( Bar->hello(undef),        "Hello, world!" );
    is( Bar->hello("Greetings!"), "Greetings!" );


    method hi($msg //= q,Hi,) {
        return $msg;
    }

    is( Bar->hi,                "Hi" );
    is( Bar->hi(undef),         "Hi" );
    is( Bar->hi("Yo"),          "Yo" );


    method list(@args = (1,2,3) when ()) {
        return @args;
    }

    is_deeply [Bar->list()],      [1,2,3];


    method code($num, $code //= sub { $num + 2 }) {
        return $code->();
    }

    is( Bar->code(42), 44 );
}

done_testing;