import { Vec3 } from "cc";
import { ecs } from "db://oops-framework/libs/ecs/ECS";
import { HeroViewComp } from "../hero/HeroViewComp";

// 投射物组件
@ecs.register('Projectile')
export class ProjectileComp extends ecs.Comp {
    speed: number = 500;        // 飞行速度
    direction: Vec3 = Vec3.RIGHT;// 飞行方向
    maxDistance: number = 1000;  // 最大射程
    traveled: number = 0;        // 已飞行距离
    penetrate: number = 3;       // 穿透次数
    targets = new Set<ecs.Entity>(); // 已命中目标

    reset() {
        this.speed = 500;
        this.direction.set(Vec3.RIGHT);
        this.maxDistance = 1000;
        this.traveled = 0;
        this.penetrate = 3;
        this.targets.clear();
    }
}

// 投射物系统
@ecs.register('ProjectileSystem')
export class ProjectileSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate {
    filter(): ecs.IMatcher {
        return ecs.allOf(ProjectileComp, HeroViewComp);
    }

    update(e: ecs.Entity): void {
        const proj = e.get(ProjectileComp);
        const view = e.get(HeroViewComp);

        // 移动计算
        const delta = proj.direction.multiplyScalar(proj.speed * this.dt);
        view.node.position = view.node.position.add(delta);
        proj.traveled += delta.length();

        // 碰撞检测（使用ECS组件检测）
        this.checkCollision(e);

        // 超出射程销毁
        if (proj.traveled >= proj.maxDistance) {
            e.destroy();
        }
    }

    private checkCollision(e: ecs.Entity) {
        const proj = e.get(ProjectileComp);
        const view = e.get(HeroViewComp);

        // 获取范围内所有敌人
        // const enemies = ecs.getEntities(HeroViewComp).filter(entity => {
        //     const enemyView = entity.get(HeroViewComp);
        //     return enemyView.boxGroup !== view.boxGroup &&
        //            Vec3.distance(view.node.position, enemyView.node.position) <= 50; // 碰撞半径
        // });

        // enemies.forEach(enemy => {
        //     if (!proj.targets.has(enemy)) {
        //         this.applyDamage(e, enemy);
        //         proj.targets.add(enemy);
        //         proj.penetrate--;
        //     }
        // });

        if (proj.penetrate <= 0) {
            e.destroy();
        }
    }

    private applyDamage(projectile: ecs.Entity, target: ecs.Entity) {
        const projView = projectile.get(HeroViewComp);
        const targetView = target.get(HeroViewComp);
        // targetView.takeDamage(projView.attack);
    }
}