package Email::Sender::Transport::Test 2.500;
# ABSTRACT: deliver mail in memory for testing

use Moo;

use Email::Sender::Failure::Multi;
use Email::Sender::Success::Partial;
use MooX::Types::MooseLike::Base qw(ArrayRef Bool);

#pod =head1 DESCRIPTION
#pod
#pod This transport is meant for testing email deliveries in memory.  It will store
#pod a record of any delivery made so that they can be inspected afterward.
#pod
#pod =for Pod::Coverage recipient_failure delivery_failure
#pod
#pod By default, the Test transport will not allow partial success and will always
#pod succeed.  It can be made to fail predictably, however, if it is extended and
#pod its C<recipient_failure> or C<delivery_failure> methods are overridden.  These
#pod methods are called as follows:
#pod
#pod   $self->delivery_failure($email, $envelope);
#pod
#pod   $self->recipient_failure($to);
#pod
#pod If they return true, the sending will fail.  If the transport was created with
#pod a true C<allow_partial_success> attribute, recipient failures can cause partial
#pod success to be returned.
#pod
#pod For more flexible failure modes, you can override more aggressively or can use
#pod L<Email::Sender::Transport::Failable>.
#pod
#pod =attr deliveries
#pod
#pod =for Pod::Coverage clear_deliveries
#pod
#pod This attribute stores an arrayref of all the deliveries made via the transport.
#pod The C<clear_deliveries> method returns a list of them.
#pod
#pod Each delivery is a hashref, in the following format:
#pod
#pod   {
#pod     email     => $email,
#pod     envelope  => $envelope,
#pod     successes => \@ok_rcpts,
#pod     failures  => \@failures,
#pod   }
#pod
#pod Both successful and failed deliveries are stored.
#pod
#pod A number of methods related to this attribute are provided:
#pod
#pod =for :list
#pod * delivery_count
#pod * clear_deliveries
#pod * shift_deliveries
#pod
#pod =cut

has allow_partial_success => (is => 'ro', isa => Bool, default => sub { 0 });

sub recipient_failure { }
sub delivery_failure  { }

has deliveries => (
  isa => ArrayRef,
  init_arg   => undef,
  default    => sub { [] },
  is         => 'ro',
  reader     => '_deliveries',
);

sub delivery_count { scalar @{ $_[0]->_deliveries } }
sub record_delivery { push @{ shift->_deliveries }, @_ }
sub deliveries { @{ $_[0]->_deliveries } }
sub shift_deliveries { shift @{ $_[0]->_deliveries } }
sub clear_deliveries { @{ $_[0]->_deliveries } = () }

sub send_email {
  my ($self, $email, $envelope) = @_;

  my @failures;
  my @ok_rcpts;

  if (my $failure = $self->delivery_failure($email, $envelope)) {
    $failure->throw;
  }

  for my $to (@{ $envelope->{to} }) {
    if (my $failure = $self->recipient_failure($to)) {
      push @failures, $failure;
    } else {
      push @ok_rcpts, $to;
    }
  }

  if (
    @failures
    and ((@ok_rcpts == 0) or (! $self->allow_partial_success))
  ) {
    $failures[0]->throw if @failures == 1 and @ok_rcpts == 0;

    my $message = sprintf '%s recipients were rejected',
      @ok_rcpts ? 'some' : 'all';

    Email::Sender::Failure::Multi->throw(
      message  => $message,
      failures => \@failures,
    );
  }

  $self->record_delivery({
    email     => $email,
    envelope  => $envelope,
    successes => \@ok_rcpts,
    failures  => \@failures,
  });

  # XXX: We must report partial success (failures) if applicable.
  return $self->success unless @failures;
  return Email::Sender::Success::Partial->new({
    failure => Email::Sender::Failure::Multi->new({
      message  => 'some recipients were rejected',
      failures => \@failures
    }),
  });
}

with 'Email::Sender::Transport';
no Moo;
1;

__END__

=pod

=encoding UTF-8

=head1 NAME

Email::Sender::Transport::Test - deliver mail in memory for testing

=head1 VERSION

version 2.500

=head1 DESCRIPTION

This transport is meant for testing email deliveries in memory.  It will store
a record of any delivery made so that they can be inspected afterward.

=head1 PERL VERSION

This library should run on perls released even a long time ago.  It should work
on any version of perl released in the last five years.

Although it may work on older versions of perl, no guarantee is made that the
minimum required version will not be increased.  The version may be increased
for any reason, and there is no promise that patches will be accepted to lower
the minimum required perl.

=head1 ATTRIBUTES

=head2 deliveries

=for Pod::Coverage recipient_failure delivery_failure

By default, the Test transport will not allow partial success and will always
succeed.  It can be made to fail predictably, however, if it is extended and
its C<recipient_failure> or C<delivery_failure> methods are overridden.  These
methods are called as follows:

  $self->delivery_failure($email, $envelope);

  $self->recipient_failure($to);

If they return true, the sending will fail.  If the transport was created with
a true C<allow_partial_success> attribute, recipient failures can cause partial
success to be returned.

For more flexible failure modes, you can override more aggressively or can use
L<Email::Sender::Transport::Failable>.

=for Pod::Coverage clear_deliveries

This attribute stores an arrayref of all the deliveries made via the transport.
The C<clear_deliveries> method returns a list of them.

Each delivery is a hashref, in the following format:

  {
    email     => $email,
    envelope  => $envelope,
    successes => \@ok_rcpts,
    failures  => \@failures,
  }

Both successful and failed deliveries are stored.

A number of methods related to this attribute are provided:

=over 4

=item *

delivery_count

=item *

clear_deliveries

=item *

shift_deliveries

=back

=head1 AUTHOR

Ricardo Signes <rjbs@semiotic.systems>

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2021 by Ricardo Signes.

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

=cut
