package Ocsinventory::Logger;
# TODO use Log::Log4perl instead.
use Carp;
sub new {

  my (undef, $params) = @_;

  my $self = {};
  bless $self;
  $self->{backend} = [];
  $self->{config} = $params->{config};

  $self->{debug} = $self->{config}->{debug}?1:0;
  my @logger;

  if (exists ($self->{config}->{logger})) {
    @logger = split /,/, $self->{config}->{logger};
  } else {
    # if no 'logger' parameter exist I use Stderr as default backend
    push @logger, 'Stderr';
  }

  my @loadedMbackends;
  foreach (@logger) {
    my $backend = "Ocsinventory::LoggerBackend::".$_;
    eval ("require $backend"); # TODO deal with error
    if ($@) {
        print STDERR "Failed to load Logger backend: $backend ($@)\n";
        next;
    } else {
        push @loadedMbackends, $_;
    }

    my $obj = new $backend ({
      config => $self->{config},
      });
    push @{$self->{backend}}, $obj if $obj;
  }
  
  my $version = "Ocsinventory unified agent for UNIX, Linux and MacOSX ";
  $version .= exists ($self->{config}->{VERSION})?$self->{config}->{VERSION}:'';
  $self->debug($version."\n");
  $self->debug("Log system initialised (@loadedMbackends)");

  $self;
}

sub log {
  my ($self, $args) = @_;

  # levels: info, debug, warn, fault
  my $level = $args->{level};
  my $message = $args->{message};
  my $header = $self->{header};

  return if ($level =~ /^debug$/ && !($self->{debug}));

  chomp($message);

  #Add a header to message if needed 
  $message="$header $message" if $header;

  $level = 'info' unless $level;

  foreach (@{$self->{backend}}) {
    $_->addMsg ({
      level => $level,
      message => $message
    });
  }
  confess if $level =~ /^fault$/; # Die with a backtace 
}

sub debug {
  my ($self, $msg) = @_;
  $self->log({ level => 'debug', message => $msg});
}

sub info {
  my ($self, $msg) = @_;
  $self->log({ level => 'info', message => $msg});
}

sub error {
  my ($self, $msg) = @_;
  $self->log({ level => 'error', message => $msg});
}

sub fault {
  my ($self, $msg) = @_;
  $self->log({ level => 'fault', message => $msg});
}

sub user {
  my ($self, $msg) = @_;
  $self->log({ level => 'user', message => $msg});
}

1;