package Log::Contextual::Router;

use Moo;
use Scalar::Util 'blessed';

with 'Log::Contextual::Role::Router',
  'Log::Contextual::Role::Router::SetLogger',
  'Log::Contextual::Role::Router::WithLogger';

eval {
   require Log::Log4perl;
   die if $Log::Log4perl::VERSION < 1.29;
   Log::Log4perl->wrapper_register(__PACKAGE__)
};

has _default_logger => (
   is       => 'ro',
   default  => sub { {} },
   init_arg => undef,
);

has _package_logger => (
   is       => 'ro',
   default  => sub { {} },
   init_arg => undef,
);

has _get_logger => (
   is       => 'ro',
   default  => sub { {} },
   init_arg => undef,
);

sub before_import { }

sub after_import {
   my ($self, %import_info) = @_;
   my $exporter = $import_info{exporter};
   my $target   = $import_info{target};
   my $config   = $import_info{arguments};

   if (my $l = $exporter->arg_logger($config->{logger})) {
      $self->set_logger($l);
   }

   if (my $l = $exporter->arg_package_logger($config->{package_logger})) {
      $self->_set_package_logger_for($target, $l);
   }

   if (my $l = $exporter->arg_default_logger($config->{default_logger})) {
      $self->_set_default_logger_for($target, $l);
   }
}

sub with_logger {
   my $logger = $_[1];
   if (ref $logger ne 'CODE') {
      die 'logger was not a CodeRef or a logger object.  Please try again.'
        unless blessed($logger);
      $logger = do {
         my $l = $logger;
         sub { $l }
        }
   }
   local $_[0]->_get_logger->{l} = $logger;
   $_[2]->();
}

sub set_logger {
   my $logger = $_[1];
   if (ref $logger ne 'CODE') {
      die 'logger was not a CodeRef or a logger object.  Please try again.'
        unless blessed($logger);
      $logger = do {
         my $l = $logger;
         sub { $l }
        }
   }

   warn 'set_logger (or -logger) called more than once!  This is a bad idea!'
     if $_[0]->_get_logger->{l};
   $_[0]->_get_logger->{l} = $logger;
}

sub _set_default_logger_for {
   my $logger = $_[2];
   if (ref $logger ne 'CODE') {
      die 'logger was not a CodeRef or a logger object.  Please try again.'
        unless blessed($logger);
      $logger = do {
         my $l = $logger;
         sub { $l }
        }
   }
   $_[0]->_default_logger->{$_[1]} = $logger
}

sub _set_package_logger_for {
   my $logger = $_[2];
   if (ref $logger ne 'CODE') {
      die 'logger was not a CodeRef or a logger object.  Please try again.'
        unless blessed($logger);
      $logger = do {
         my $l = $logger;
         sub { $l }
        }
   }
   $_[0]->_package_logger->{$_[1]} = $logger
}

sub get_loggers {
   my ($self, %info) = @_;
   my $package   = $info{caller_package};
   my $log_level = $info{message_level};
   my $logger =
     (     $_[0]->_package_logger->{$package}
        || $_[0]->_get_logger->{l}
        || $_[0]->_default_logger->{$package}
        || die
        q( no logger set!  you can't try to log something without a logger! ));

   $info{caller_level}++;
   $logger = $logger->($package, \%info);

   return $logger if $logger ->${\"is_${log_level}"};
   return ();
}

sub handle_log_request {
   my ($self, %message_info) = @_;
   my $generator = $message_info{message_sub};
   my $args      = $message_info{message_args};
   my $log_level = $message_info{message_level};

   $message_info{caller_level}++;

   foreach my $logger ($self->get_loggers(%message_info)) {
      $logger->$log_level($generator->(@$args));
   }
}

1;