import 'dart:math' as math;

import 'package:wolf_dart/classes/coordinate_2d.dart';
import 'package:wolf_dart/features/entities/enemies/enemy.dart';
import 'package:wolf_dart/features/entities/entity.dart';

class Dog extends Enemy {
  static const double speed = 0.05; // Dogs are much faster than guards!
  bool _hasBittenThisCycle = false;

  Dog({
    required super.x,
    required super.y,
    required super.angle,
    required super.mapId,
  }) : super(
         spriteIndex: 99, // Dogs start at index 99 in VSWAP
         state: EntityState.idle,
       );

  static Dog? trySpawn(int objId, double x, double y, int difficultyLevel) {
    bool canSpawn = false;
    switch (difficultyLevel) {
      case 0:
        canSpawn = objId >= 116 && objId <= 119;
        break;
      case 1:
        canSpawn = objId >= 152 && objId <= 155;
        break;
      case 2:
        canSpawn = objId >= 188 && objId <= 191;
        break;
      case 3:
        canSpawn = objId >= 224 && objId <= 227;
        break;
    }

    if (canSpawn) {
      return Dog(
        x: x,
        y: y,
        angle: Enemy.getInitialAngle(objId),
        mapId: objId,
      );
    }
    return null;
  }

  @override
  ({Coordinate2D movement, double newAngle}) update({
    required int elapsedMs,
    required Coordinate2D playerPosition,
    required bool Function(int x, int y) isWalkable,
    required void Function(int x, int y) tryOpenDoor, // NEW
    required void Function(int damage) onDamagePlayer,
  }) {
    Coordinate2D movement = const Coordinate2D(0, 0);
    double newAngle = angle;

    // 1. Wake up logic
    if (state == EntityState.idle &&
        hasLineOfSight(playerPosition, isWalkable)) {
      if (reactionTimeMs == 0) {
        reactionTimeMs = elapsedMs + 100 + math.Random().nextInt(200);
      } else if (elapsedMs >= reactionTimeMs) {
        state = EntityState.patrolling;
        lastActionTime = elapsedMs;
        reactionTimeMs = 0;
      }
    }

    double distance = position.distanceTo(playerPosition);
    double angleToPlayer = position.angleTo(playerPosition);

    if (state != EntityState.idle && state != EntityState.dead) {
      newAngle = angleToPlayer;
    }

    double diff = newAngle - angleToPlayer;
    while (diff <= -math.pi) {
      diff += 2 * math.pi;
    }
    while (diff > math.pi) {
      diff -= 2 * math.pi;
    }

    int octant = ((diff + (math.pi / 8)) / (math.pi / 4)).floor() % 8;
    if (octant < 0) octant += 8;

    // 3. Clean State Machine
    switch (state) {
      case EntityState.idle:
        spriteIndex = 99 + octant;
        break;

      case EntityState.patrolling:
        if (distance > 0.8) {
          double deltaX = playerPosition.x - position.x;
          double deltaY = playerPosition.y - position.y;

          double moveX = deltaX > 0 ? speed : (deltaX < 0 ? -speed : 0);
          double moveY = deltaY > 0 ? speed : (deltaY < 0 ? -speed : 0);

          Coordinate2D intendedMovement = Coordinate2D(moveX, moveY);

          // Pass tryOpenDoor down!
          movement = getValidMovement(
            intendedMovement,
            isWalkable,
            tryOpenDoor,
          );
        }

        int walkFrame = (elapsedMs ~/ 100) % 4;
        spriteIndex = 107 + (walkFrame * 8) + octant;

        if (distance < 1.0 && elapsedMs - lastActionTime > 1000) {
          state = EntityState.shooting;
          lastActionTime = elapsedMs;
          _hasBittenThisCycle = false;
        }
        break;

      case EntityState.shooting:
        int timeAttacking = elapsedMs - lastActionTime;
        if (timeAttacking < 200) {
          spriteIndex = 139;
          if (!_hasBittenThisCycle) {
            onDamagePlayer(5);
            _hasBittenThisCycle = true;
          }
        } else {
          state = EntityState.patrolling;
          lastActionTime = elapsedMs;
        }
        break;

      default:
        break;
    }

    return (movement: movement, newAngle: newAngle);
  }
}