#! perl # MANDATORY

cf::map->register (qr{^\?random/([0-9a-f]{32})});

sub init {
   my ($self) = @_;

   $self->{random_id} = $1;

   if (0 < Coro::AIO::aio_load "$cf::RANDOM_MAPS/$self->{random_id}.meta", my $data) {
      $self->{random} = cf::from_json $data;
      $self->{random}{custom} ||= "$self->{random}{origin_map}+$self->{random}{origin_x}+$self->{random}{origin_y}";
   } else {
      warn "unable to read meta file for $self->{random_id}\n";
      return 0;
   }

   1
}

sub thawer_merge {
   # we have to keep some variables in memory intact
   local $_[0]{random_id};
   local $_[0]{random};

   $_[0]->SUPER::thawer_merge ($_[1]);
}

sub visible_name {
   my ($self) = @_;

   my $rmp = $self->{random};
   "random map at $rmp->{custom}, level $rmp->{dungeon_level}"
}

sub save_path {
   my ($self) = @_;

   sprintf "%s/%s.map", $cf::RANDOM_MAPS, $self->{random_id}
}

sub uniq_path {
   undef
}

sub load_header_orig {
   my ($self) = @_;

   return unless $self->{random};

   $self->generate_random_map ($self->{random});

   1
}

sub clean_random_maps {
   my $files = Coro::AIO::aio_readdir $cf::RANDOM_MAPS
      or return;

   my $META_TIMEOUT = $cf::CFG{map_random_meta_timeout} || 86400 * 7;
   my $MAP_TIMEOUT  = $cf::CFG{map_random_map_timeout}  || 3600 * 6;

   for my $file (@$files) {
      next if $file =~ /\.pst$/;

      Coro::AIO::aio_stat "$cf::RANDOM_MAPS/$file"
         and next;

      my $age = $cf::NOW - (stat _)[8];

      if ($file =~ /\.meta$/) {
         if ($age > $META_TIMEOUT) {
            warn "resetting random meta data for $file";
            IO::AIO::aio_unlink "$cf::RANDOM_MAPS/$file";
         }
      } else {
         if ($age > $MAP_TIMEOUT) {
            warn "resetting random map $file";
            IO::AIO::aioreq_pri 4; IO::AIO::aio_unlink "$cf::RANDOM_MAPS/$file";
            IO::AIO::aioreq_pri 4; IO::AIO::aio_unlink "$cf::RANDOM_MAPS/$file.pst";
         }
      }
   }
}

# clean up old temp maps regularly
Event->timer (
   reentrant => 0,
   data      => cf::WF_AUTOCANCEL,
   interval  => 3600,
   after     => 60,
   cb        => Coro::unblock_sub { clean_random_maps },
);

# map generator stresstest, never enable under normal circumstances
if (0) {
   cf::async {
      my $seed = 0;
      while () {
         my $map = cf::map::new;
         $map->generate_random_map ({
            region => "scorn",
            random_seed => $seed++,
            xsize => 12,
            ysize => 12,
         });
         warn sprintf "%d: %d %d\n", $seed, $map->width, $map->height;#d#
         $map->destroy;
      }
   };
}

1