import {
  _decorator,
  Component,
  Vec3,
  RigidBody,
  input,
  Input,
  EventTouch,
} from "cc";
import { TrajectoryPreview } from "./TrajectoryPreview";
const { ccclass, property } = _decorator;

@ccclass("GameMrg")
export class GameMrg extends Component {
  @property(RigidBody)
  rigidBody: RigidBody = null!;

  @property(TrajectoryPreview)
  trajectory: TrajectoryPreview = null!;

  @property
  maxPower: number = 25;

  private startPos: Vec3 = new Vec3();
  private endPos: Vec3 = new Vec3();
  private isDragging: boolean = false;

  start() {
    input.on(Input.EventType.TOUCH_START, this.onTouchStart, this);
    input.on(Input.EventType.TOUCH_MOVE, this.onTouchMove, this);
    input.on(Input.EventType.TOUCH_END, this.onTouchEnd, this);
    input.on(Input.EventType.TOUCH_CANCEL, this.onTouchEnd, this);
  }

  onDestroy() {
    input.off(Input.EventType.TOUCH_START, this.onTouchStart, this);
    input.off(Input.EventType.TOUCH_MOVE, this.onTouchMove, this);
    input.off(Input.EventType.TOUCH_END, this.onTouchEnd, this);
    input.off(Input.EventType.TOUCH_CANCEL, this.onTouchEnd, this);
  }

  onTouchStart(e: EventTouch) {
    this.startPos.set(e.getLocation().x, e.getLocation().y, 0);
    this.isDragging = true;
  }

  onTouchMove(e: EventTouch) {
    if (!this.isDragging) return;
    this.endPos.set(e.getLocation().x, e.getLocation().y, 0);
    const dragVec = new Vec3(
      this.startPos.x - this.endPos.x,
      this.startPos.y - this.endPos.y,
      0
    );
    if (dragVec.length() < 10) {
      this.trajectory.hideTrajectory();
      return;
    }

    // 主方向（始终向前 + 抬升）
    const forward = new Vec3(0, 0.5, 1).normalize();

    // 力度
    const power = Math.min(dragVec.y * 0.05 + 10, this.maxPower);

    // 左右弧线
    const sideForce = dragVec.x * 0.02;

    // 显示轨迹
    this.trajectory.showTrajectory(
      //   this.rigidBody.node.worldPosition,
      this.startPos.clone(),
      forward,
      power,
      sideForce
    );
  }

  onTouchEnd(e: EventTouch) {
    if (!this.isDragging) return;
    this.isDragging = false;
    this.trajectory.hideTrajectory();

    this.endPos.set(e.getLocation().x, e.getLocation().y, 0);

    const dragVec = new Vec3(
      this.startPos.x - this.endPos.x,
      this.startPos.y - this.endPos.y,
      0
    );

    if (dragVec.length() < 10) return;

    // 主方向
    const forward = new Vec3(0, 0.5, 1).normalize();

    // 力度
    const power = Math.min(dragVec.y * 0.05 + 10, this.maxPower);

    // 左右弧线
    const sideForce = dragVec.x * 0.02;

    // 发射冲量
    const impulse = forward.multiplyScalar(power);
    impulse.x += sideForce;

    this.rigidBody.applyImpulse(impulse);
  }
}