use 5.010;
use strict;
use warnings;

{
	package Ask::Fallback;
	
	our $AUTHORITY = 'cpan:TOBYINK';
	our $VERSION   = '0.007';
	
	use Moo;
	use Carp qw(croak);
	use namespace::sweep;
	
	with 'Ask::API';
	
	sub quality {
		return 1;
	}
	
	sub info {
		my ($self, %o) = @_;
		say STDERR $o{text};
	}
	
	sub warning {
		my ($self, %o) = @_;
		say STDERR "WARNING: $o{text}";
	}
	
	sub error {
		my ($self, %o) = @_;
		say STDERR "ERROR: $o{text}";
	}
	
	sub question
	{
		my ($self, %o) = @_;
		exists $o{default} and return $o{default};
		croak "question (Ask::Fallback) with no default";
	}
	
	sub entry
	{
		my ($self, %o) = @_;
		exists $o{default} and return $o{default};
		croak "entry (Ask::Fallback) with no default";
	}
	
	sub file_selection
	{
		my ($self, %o) = @_;
		$o{multiple} and exists $o{default} and return @{$o{default}};
		exists $o{default} and return $o{default};
		croak "file_selection (Ask::Fallback) with no default";
	}
	
	sub single_choice
	{
		my ($self, %o) = @_;
		exists $o{default} and return $o{default};
		croak "single_choice (Ask::Fallback) with no default";
	}
	
	sub multiple_choice
	{
		my ($self, %o) = @_;
		exists $o{default} and return @{$o{default}};
		croak "multiple_choice (Ask::Fallback) with no default";
	}
}

1;

__END__

=head1 NAME

Ask::Fallback - backend for unattended scripts

=head1 SYNOPSIS

	my $ask = Ask::Fallback->new;
	
	$ask->info(text => "I'm Charles Xavier");
	if ($ask->question(
		text    => "Would you like some breakfast?",
		default => !!1,
	)) {
		...
	}

=head1 DESCRIPTION

This backend prints all output to STDERR; returns defaults for
C<question>, C<file_selection>, etc, and croaks if no defaults are
available.

This backend is used if the C<PERL_MM_USE_DEFAULT> or C<AUTOMATED_TESTING>
environemnt variables are set to true, or as a last resort if no other
Ask backend can be used.

=head1 BUGS

Please report any bugs to
L<http://rt.cpan.org/Dist/Display.html?Queue=Ask>.

=head1 SEE ALSO

L<Ask>.

=head1 AUTHOR

Toby Inkster E<lt>tobyink@cpan.orgE<gt>.

=head1 COPYRIGHT AND LICENCE

This software is copyright (c) 2012-2013 by Toby Inkster.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=head1 DISCLAIMER OF WARRANTIES

THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.