import { _decorator, Component, Vec3 } from 'cc';
import { BulletLifecycleConfig, HitResult } from '../BulletTypes';
const { ccclass } = _decorator;

/**
 * 生命周期控制（可移植版）：范围、时间、穿透/弹射计数、返回发射源等
 */
@ccclass('BCBulletLifecycle')
export class BulletLifecycle extends Component {
  private cfg: BulletLifecycleConfig | null = null;
  private origin: Vec3 = new Vec3();
  private lifetime = 0;
  private distance = 0;
  private piercingLeft = 0;
  private ricochetLeft = 0;
  private shouldReturn = false;
  private returnTimer = 0;

  public init(cfg: BulletLifecycleConfig, startPos: Vec3, pierceInit?: number, ricochetInit?: number) {
    this.cfg = { ...cfg };
    this.origin.set(startPos);
    this.lifetime = 0;
    this.distance = 0;
    this.piercingLeft = Math.max(0, pierceInit ?? (cfg?.penetration ?? 0));
    this.ricochetLeft = Math.max(0, ricochetInit ?? (cfg?.ricochetCount ?? 0));
    this.returnTimer = 0;
    this.shouldReturn = !!cfg?.returnToOrigin;
  }

  update(dt: number) {
    if (!this.cfg) return;
    this.lifetime += dt;
    const pos = this.node.worldPosition;
    const dx = pos.x - this.origin.x;
    const dy = pos.y - this.origin.y;
    this.distance = Math.sqrt(dx * dx + dy * dy);

    // 处理返回延迟
    if (this.shouldReturn) {
      const delay = Math.max(0, this.cfg.returnDelay ?? 0);
      if (this.lifetime >= delay) {
        // 上层可以根据 shouldReturnNow 触发回程逻辑（例如改变弹道方向）
      }
    }
  }

  /** 命中时通知，用于更新计数 */
  public notifyHit(hit: HitResult) {
    if (hit.pierced) {
      if (this.piercingLeft > 0) this.piercingLeft -= 1;
    } else {
      // 非穿透命中默认视为消耗一次 penetration（例如普通 hit_destroy）
      if (this.piercingLeft > 0) this.piercingLeft -= 1;
    }
    if (hit.ricochet) {
      if (this.ricochetLeft > 0) this.ricochetLeft -= 1;
    }
  }

  /** 是否应该立即销毁 */
  public shouldDestroyNow(): boolean {
    if (!this.cfg) return true;
    // 时间限制
    const maxLifetime = this.cfg.maxLifetime ?? Infinity;
    if (this.lifetime > maxLifetime) return true;
    // 射程限制
    const maxRange = this.cfg.maxRange ?? Infinity;
    if (this.cfg.type === 'range_limit' && this.distance > maxRange) return true;
    // 穿透/弹射计数耗尽
    if (this.cfg.type === 'hit_destroy' && this.piercingLeft <= 0) return true;
    if (this.cfg.type === 'ricochet_counter' && this.ricochetLeft <= 0) return true;
    // ground_impact：由外层根据地面碰撞事件触发销毁，此处不主动判定
    return false;
  }

  /** 是否进入回程阶段（供上层改变弹道方向） */
  public shouldReturnNow(): boolean {
    if (!this.cfg || !this.shouldReturn) return false;
    const delay = Math.max(0, this.cfg.returnDelay ?? 0);
    return this.lifetime >= delay;
  }
}