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 BrownGuard extends Enemy {
  static const double speed = 0.03;
  bool _hasFiredThisCycle = false;

  BrownGuard({
    required super.x,
    required super.y,
    required super.angle,
    required super.mapId,
  }) : super(
         // Default front-facing idle
         spriteIndex: 50,
         state: EntityState.idle,
       );

  static BrownGuard? trySpawn(
    int objId,
    double x,
    double y,
    int difficultyLevel,
  ) {
    bool canSpawn = false;
    switch (difficultyLevel) {
      case 0:
        canSpawn = objId >= 108 && objId <= 115;
        break;
      case 1:
        canSpawn = objId >= 144 && objId <= 151;
        break;
      case 2:
        canSpawn = objId >= 180 && objId <= 187;
        break;
      case 3:
        canSpawn = objId >= 216 && objId <= 223;
        break;
    }

    if (canSpawn) {
      return BrownGuard(
        x: x,
        y: y,
        angle: Enemy.getInitialAngle(objId),
        mapId: objId,
      );
    }
    return null; // Not a Brown Guard!
  }

  @override
  ({Coordinate2D movement, double newAngle}) update({
    required int elapsedMs,
    required Coordinate2D playerPosition,
    required bool Function(int x, int y) isWalkable,
    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)) {
      state = EntityState.patrolling;
      lastActionTime = elapsedMs;
    }

    // 2. Pre-calculate spatial relations
    double distance = position.distanceTo(playerPosition);
    double angleToPlayer = position.angleTo(playerPosition);

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

    // Calculate Octant for sprite direction
    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. State Machine
    switch (state) {
      case EntityState.idle:
        spriteIndex = 50 + octant;
        break;

      case EntityState.patrolling:
        if (distance > 0.8) {
          // Calculate movement intent
          movement =
              Coordinate2D(math.cos(newAngle), math.sin(newAngle)) * speed;
        }

        int walkFrame = (elapsedMs ~/ 150) % 4;
        spriteIndex = 58 + (walkFrame * 8) + octant;

        if (distance < 5.0 && elapsedMs - lastActionTime > 2000) {
          if (hasLineOfSight(playerPosition, isWalkable)) {
            state = EntityState.shooting;
            lastActionTime = elapsedMs;
            _hasFiredThisCycle = false;
          }
        }
        break;

      case EntityState.shooting:
        int timeShooting = elapsedMs - lastActionTime;
        if (timeShooting < 150) {
          spriteIndex = 96;
        } else if (timeShooting < 300) {
          spriteIndex = 97;
          if (!_hasFiredThisCycle) {
            onDamagePlayer(10); // DAMAGING PLAYER
            _hasFiredThisCycle = true;
          }
        } else if (timeShooting < 450) {
          spriteIndex = 98;
        } else {
          state = EntityState.patrolling;
          lastActionTime = elapsedMs;
        }
        break;

      case EntityState.pain:
        spriteIndex = 94;
        if (elapsedMs - lastActionTime > 250) {
          state = EntityState.patrolling;
          lastActionTime = elapsedMs;
        }
        break;

      case EntityState.dead:
        if (isDying) {
          int deathFrame = (elapsedMs - lastActionTime) ~/ 150;
          if (deathFrame < 4) {
            spriteIndex = 90 + deathFrame - 1;
          } else {
            spriteIndex = 95;
            isDying = false;
          }
        } else {
          spriteIndex = 95;
        }
        break;
      default:
        break;
    }

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