package MooseX::AttributeHelpers::MethodProvider::Array;
use Moose::Role;

our $VERSION   = '0.17';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';

with 'MooseX::AttributeHelpers::MethodProvider::List';

sub push : method {
    my ($attr, $reader, $writer) = @_;
    
    if ($attr->has_type_constraint && $attr->type_constraint->isa('Moose::Meta::TypeConstraint::Parameterized')) {
        my $container_type_constraint = $attr->type_constraint->type_parameter;
        return sub { 
            my $instance = CORE::shift;
            $container_type_constraint->check($_) 
                || confess "Value " . ($_||'undef') . " did not pass container type constraint '$container_type_constraint'"
                    foreach @_;
            CORE::push @{$reader->($instance)} => @_; 
        };                    
    }
    else {
        return sub { 
            my $instance = CORE::shift;
            CORE::push @{$reader->($instance)} => @_; 
        };
    }
}

sub pop : method {
    my ($attr, $reader, $writer) = @_;
    return sub { 
        CORE::pop @{$reader->($_[0])} 
    };
}

sub unshift : method {
    my ($attr, $reader, $writer) = @_;
    if ($attr->has_type_constraint && $attr->type_constraint->isa('Moose::Meta::TypeConstraint::Parameterized')) {
        my $container_type_constraint = $attr->type_constraint->type_parameter;
        return sub { 
            my $instance = CORE::shift;
            $container_type_constraint->check($_) 
                || confess "Value " . ($_||'undef') . " did not pass container type constraint '$container_type_constraint'"
                    foreach @_;
            CORE::unshift @{$reader->($instance)} => @_; 
        };                    
    }
    else {                
        return sub { 
            my $instance = CORE::shift;
            CORE::unshift @{$reader->($instance)} => @_; 
        };
    }
}

sub shift : method {
    my ($attr, $reader, $writer) = @_;
    return sub { 
        CORE::shift @{$reader->($_[0])} 
    };
}
   
sub get : method {
    my ($attr, $reader, $writer) = @_;
    return sub { 
        $reader->($_[0])->[$_[1]] 
    };
}

sub set : method {
    my ($attr, $reader, $writer) = @_;
    if ($attr->has_type_constraint && $attr->type_constraint->isa('Moose::Meta::TypeConstraint::Parameterized')) {
        my $container_type_constraint = $attr->type_constraint->type_parameter;
        return sub { 
            ($container_type_constraint->check($_[2])) 
                || confess "Value " . ($_[2]||'undef') . " did not pass container type constraint '$container_type_constraint'";
            $reader->($_[0])->[$_[1]] = $_[2]
        };                    
    }
    else {                
        return sub { 
            $reader->($_[0])->[$_[1]] = $_[2] 
        };
    }
}

sub accessor : method {
    my ($attr, $reader, $writer) = @_;

    if ($attr->has_type_constraint && $attr->type_constraint->isa('Moose::Meta::TypeConstraint::Parameterized')) {
        my $container_type_constraint = $attr->type_constraint->type_parameter;
        return sub {
            my $self = shift;

            if (@_ == 1) { # reader
                return $reader->($self)->[$_[0]];
            }
            elsif (@_ == 2) { # writer
                ($container_type_constraint->check($_[1]))
                    || confess "Value " . ($_[1]||'undef') . " did not pass container type constraint '$container_type_constraint'";
                $reader->($self)->[$_[0]] = $_[1];
            }
            else {
                confess "One or two arguments expected, not " . @_;
            }
        };
    }
    else {
        return sub {
            my $self = shift;

            if (@_ == 1) { # reader
                return $reader->($self)->[$_[0]];
            }
            elsif (@_ == 2) { # writer
                $reader->($self)->[$_[0]] = $_[1];
            }
            else {
                confess "One or two arguments expected, not " . @_;
            }
        };
    }
}

sub clear : method {
    my ($attr, $reader, $writer) = @_;
    return sub { 
        @{$reader->($_[0])} = ()
    };
}

sub delete : method {
    my ($attr, $reader, $writer) = @_;
    return sub {
        CORE::splice @{$reader->($_[0])}, $_[1], 1;
    }
}

sub insert : method {
    my ($attr, $reader, $writer) = @_;
    if ($attr->has_type_constraint && $attr->type_constraint->isa('Moose::Meta::TypeConstraint::Parameterized')) {
        my $container_type_constraint = $attr->type_constraint->type_parameter;
        return sub { 
            ($container_type_constraint->check($_[2])) 
                || confess "Value " . ($_[2]||'undef') . " did not pass container type constraint '$container_type_constraint'";
            CORE::splice @{$reader->($_[0])}, $_[1], 0, $_[2];
        };                    
    }
    else {                
        return sub { 
            CORE::splice @{$reader->($_[0])}, $_[1], 0, $_[2];
        };
    }    
}

sub splice : method {
    my ($attr, $reader, $writer) = @_;
    if ($attr->has_type_constraint && $attr->type_constraint->isa('Moose::Meta::TypeConstraint::Parameterized')) {
        my $container_type_constraint = $attr->type_constraint->type_parameter;
        return sub { 
            my ( $self, $i, $j, @elems ) = @_;
            ($container_type_constraint->check($_)) 
                || confess "Value " . (defined($_) ? $_ : 'undef') . " did not pass container type constraint '$container_type_constraint'" for @elems;
            CORE::splice @{$reader->($self)}, $i, $j, @elems;
        };                    
    }
    else {                
        return sub {
            my ( $self, $i, $j, @elems ) = @_;
            CORE::splice @{$reader->($self)}, $i, $j, @elems;
        };
    }    
}

sub sort_in_place : method {
    my ($attr, $reader, $writer) = @_;
    return sub {
        my ($instance, $predicate) = @_;

        die "Argument must be a code reference"
            if $predicate && ref $predicate ne 'CODE';

        my @sorted;
        if ($predicate) {
            @sorted = CORE::sort { $predicate->($a, $b) } @{$reader->($instance)};
        }
        else {
            @sorted = CORE::sort @{$reader->($instance)};
        }

        $writer->($instance, \@sorted);
    };
}

1;

__END__

=pod

=head1 NAME

MooseX::AttributeHelpers::MethodProvider::Array

=head1 DESCRIPTION

This is a role which provides the method generators for 
L<MooseX::AttributeHelpers::Collection::Array>.

=head1 METHODS

=over 4

=item B<meta>

=back

=head1 PROVIDED METHODS

This module also consumes the B<List> method providers, to 
see those provied methods, refer to that documentation.

=over 4

=item B<get>

=item B<pop>

=item B<push>

=item B<set>

=item B<shift>

=item B<unshift>

=item B<clear>

=item B<delete>

=item B<insert>

=item B<splice>

=item B<sort_in_place>

Sorts the array I<in place>, modifying the value of the attribute.

You can provide an optional subroutine reference to sort with (as you
can with the core C<sort> function). However, instead of using C<$a>
and C<$b>, you will need to use C<$_[0]> and C<$_[1]> instead.

=item B<accessor>

If passed one argument, returns the value of the requested element.
If passed two arguments, sets the value of the requested element.

=back

=head1 BUGS

All complex software has bugs lurking in it, and this module is no 
exception. If you find a bug please either email me, or add the bug
to cpan-RT.

=head1 AUTHOR

Stevan Little E<lt>stevan@iinteractive.comE<gt>

=head1 COPYRIGHT AND LICENSE

Copyright 2007-2008 by Infinity Interactive, Inc.

L<http://www.iinteractive.com>

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

=cut
