import 'package:wolf_dart/features/difficulty/difficulty.dart';
import 'package:wolf_dart/features/entities/collectible.dart';
import 'package:wolf_dart/features/entities/decorative.dart';
import 'package:wolf_dart/features/entities/enemies/brown_guard.dart';
import 'package:wolf_dart/features/entities/enemies/dog.dart';
import 'package:wolf_dart/features/entities/entity.dart';
import 'package:wolf_dart/features/entities/map_objects.dart';

typedef EntitySpawner =
    Entity? Function(
      int objId,
      double x,
      double y,
      Difficulty difficulty,
    );

abstract class EntityRegistry {
  static final List<EntitySpawner> _spawners = [
    BrownGuard.trySpawn,
    Dog.trySpawn,
    Collectible.trySpawn,
    Decorative.trySpawn,
  ];

  static Entity? spawn(
    int objId,
    double x,
    double y,
    Difficulty difficulty,
    int maxSprites,
  ) {
    // 1. Difficulty check before even looking for a spawner
    if (!MapObject.shouldSpawn(objId, difficulty)) return null;

    for (final spawner in _spawners) {
      Entity? entity = spawner(objId, x, y, difficulty);

      if (entity != null) {
        // Safety bounds check for the VSWAP array
        if (entity.spriteIndex >= 0 && entity.spriteIndex < maxSprites) {
          return entity;
        }
        return null; // VSWAP doesn't have this sprite!
      }
    }
    return null; // No class claimed this Map ID
  }
}