import { _decorator, Component, Node, Vec3, director, Collider2D, Contact2DType, IPhysics2DContact } from 'cc';
import { GameManager } from './GameManager';
const { ccclass, property } = _decorator;

@ccclass('Bullet')
export class Bullet extends Component {
    @property
    speed: number = 300;

    @property
    lifeTime: number = 5;

    private _target: Node = null;
    private _direction: Vec3 = new Vec3(0, 0, 0);
    private _gameManager: GameManager = null;

    start() {
        // 获取游戏管理器
        this._gameManager = director.getScene().getComponentInChildren(GameManager);
        
        // 设置生命周期
        this.scheduleOnce(() => {
            if (this.node && this.node.isValid) {
                this.node.destroy();
            }
        }, this.lifeTime);
        
        // 注册碰撞事件
        const collider = this.getComponent(Collider2D);
        if (collider) {
            collider.on(Contact2DType.BEGIN_CONTACT, this.onBeginContact, this);
        }
    }

    update(dt: number) {
        // 如果有目标，则追踪目标
        if (this._target && this._target.isValid) {
            // 计算朝向目标的方向
            const targetPos = this._target.position;
            this._direction = Vec3.subtract(new Vec3(), targetPos, this.node.position).normalize();
        }
        
        // 移动子弹
        const movement = new Vec3(
            this._direction.x * this.speed * dt,
            this._direction.y * this.speed * dt,
            0
        );
        this.node.position = Vec3.add(new Vec3(), this.node.position, movement);
    }

    setTarget(target: Node) {
        this._target = target;
        
        // 初始化方向
        if (target && target.isValid) {
            this._direction = Vec3.subtract(new Vec3(), target.position, this.node.position).normalize();
        }
    }

    onBeginContact(selfCollider: Collider2D, otherCollider: Collider2D, contact: IPhysics2DContact) {
        // 检测是否与敌人碰撞
        if (otherCollider.node.name === 'Enemy') {
            // 销毁敌人
            if (this._gameManager) {
                this._gameManager.removeEnemy(otherCollider.node);
            }
            otherCollider.node.destroy();
            
            // 销毁子弹
            this.node.destroy();
        }
        // 检测是否与墙碰撞
        else if (otherCollider.node.name.includes('Wall')) {
            // 销毁子弹
            this.node.destroy();
        }
    }
}