import 'package:wolf_dart/classes/coordinate_2d.dart';

enum EntityState { staticObj, idle, patrolling, attacking, pain, dead }

abstract class Entity<T> {
  double x;
  double y;
  int spriteIndex;
  double angle;
  EntityState state;
  int mapId;
  int lastActionTime;

  Entity({
    required this.x,
    required this.y,
    required this.spriteIndex,
    this.angle = 0.0,
    this.state = EntityState.staticObj,
    this.mapId = 0,
    this.lastActionTime = 0,
  });

  set position(Coordinate2D pos) {
    x = pos.x;
    y = pos.y;
  }

  Coordinate2D get position => Coordinate2D(x, y);

  // NEW: Checks if a projectile or sightline from 'source' can reach this entity
  bool hasLineOfSightFrom(
    Coordinate2D source,
    double sourceAngle,
    double distance,
    bool Function(int x, int y) isWalkable,
  ) {
    // Corrected Integer Bresenham Algorithm
    int currentX = source.x.toInt();
    int currentY = source.y.toInt();
    int targetX = x.toInt();
    int targetY = y.toInt();

    int dx = (targetX - currentX).abs();
    int dy = -(targetY - currentY).abs();
    int sx = currentX < targetX ? 1 : -1;
    int sy = currentY < targetY ? 1 : -1;
    int err = dx + dy;

    while (true) {
      if (!isWalkable(currentX, currentY)) return false;
      if (currentX == targetX && currentY == targetY) break;

      int e2 = 2 * err;
      if (e2 >= dy) {
        err += dy;
        currentX += sx;
      }
      if (e2 <= dx) {
        err += dx;
        currentY += sy;
      }
    }
    return true;
  }
}