#!perl
use warnings FATAL => 'all';
use strict;

use Test::More
    eval { require MooseX::Types }
    ? (tests => 34)
    : (skip_all => "MooseX::Types required for testing types")
;
use Test::Fatal;
use MooseX::Types::Moose qw(Int Str ArrayRef CodeRef);

use Function::Parameters qw(:strict);


fun foo(Int $n, CodeRef $f, $x) {
    $x = $f->($x) for 1 .. $n;
    $x
}

is foo(0, fun (@) {}, undef), undef;
is foo(0, fun (@) {}, "o hai"), "o hai";
is foo(3, fun ($x) { "($x)" }, 1.5), "(((1.5)))";
is foo(3, fun (Str $x) { "($x)" }, 1.5), "(((1.5)))";

{
    my $info = Function::Parameters::info \&foo;
    is $info->invocant, undef;
    is $info->slurpy, undef;
    is $info->positional_optional, 0;
    is $info->named_required, 0;
    is $info->named_optional, 0;
    my @req = $info->positional_required;
    is @req, 3;
    is $req[0]->name, '$n';
    ok $req[0]->type->equals(Int);
    is $req[1]->name, '$f';
    ok $req[1]->type->equals(CodeRef);
    is $req[2]->name, '$x';
    is $req[2]->type, undef;
}

like exception { foo("ermagerd", fun (@) {}, undef) }, qr/\bparameter 1.+\$n\b.+\bValidation failed\b.+\bInt\b.+ermagerd/;
like exception { foo(0, {}, undef) }, qr/\bparameter 2.+\$f\b.+\bValidation failed\b.+\bCodeRef\b/;

fun bar(((Function::Parameters::info(\&foo)->positional_required)[0]->type) $whoa) { $whoa * 2 }

is bar(21), 42;
{
    my $info = Function::Parameters::info \&bar;
    is $info->invocant, undef;
    is $info->slurpy, undef;
    is $info->positional_optional, 0;
    is $info->named_required, 0;
    is $info->named_optional, 0;
    my @req = $info->positional_required;
    is @req, 1;
    is $req[0]->name, '$whoa';
    ok $req[0]->type->equals(Int);
}

{
    my $info = Function::Parameters::info(fun ( ArrayRef [ Int | CodeRef ]@nom) {});
    is $info->invocant, undef;
    is $info->positional_required, 0;
    is $info->positional_optional, 0;
    is $info->named_required, 0;
    is $info->named_optional, 0;
    my $slurpy = $info->slurpy;
    is $slurpy->name, '@nom';
    ok $slurpy->type->equals(ArrayRef[Int|CodeRef]);
}