///////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2002-2023, Open Design Alliance (the "Alliance").
// All rights reserved.
//
// This software and its documentation and related materials are owned by
// the Alliance. The software may only be incorporated into application
// programs owned by members of the Alliance, subject to a signed
// Membership Agreement and Supplemental Software License Agreement with the
// Alliance. The structure and organization of this software are the valuable
// trade secrets of the Alliance and its suppliers. The software is also
// protected by copyright law and international treaty provisions. Application
// programs incorporating this software must include the following statement
// with their copyright notices:
//
//   This application incorporates Open Design Alliance software pursuant to a
//   license agreement with Open Design Alliance.
//   Open Design Alliance Copyright (C) 2002-2021 by Open Design Alliance.
//   All rights reserved.
//
// By use of this software, its documentation or related materials, you
// acknowledge and accept the above terms.
///////////////////////////////////////////////////////////////////////////////

import * as THREE from "three";

export class ClippingPlaneDragger {
  protected viewer: any;
  protected start: THREE.Vector3;
  protected end: THREE.Vector3;
  protected delta: THREE.Vector3;
  protected planeHelper: THREE.PlaneHelper;

  public plane: THREE.Plane;

  constructor(viewer: any) {
    this.viewer = viewer;

    this.viewer.addEventListener("pointerdown", this.onPointerDown);
    this.viewer.addEventListener("pointerup", this.onPointerUp);

    this.plane = new THREE.Plane(new THREE.Vector3(0, 1, 0), 0);

    this.start = new THREE.Vector3();
    this.end = new THREE.Vector3();
    this.delta = new THREE.Vector3();
    if (!this.viewer.renderer.clippingPlanes) this.viewer.renderer.clippingPlanes = [];

    this.viewer.renderer.clippingPlanes.push(this.plane);

    this.planeHelper = new THREE.PlaneHelper(this.plane, 150, 0xffff00);
    this.viewer.scene.add(this.planeHelper);
  }

  dispose() {
    this.viewer.removeEventListener("pointerdown", this.onPointerDown);
    this.viewer.removeEventListener("pointerup", this.onPointerUp);
    this.viewer.removeEventListener("pointermove", this.onPointerMove);

    this.viewer.renderer.clippingPlanes = this.viewer.renderer.clippingPlanes.filter((plane) => this.plane !== plane);

    this.planeHelper.removeFromParent();
  }

  onPointerDown = (event: PointerEvent) => {
    this.viewer.addEventListener("pointermove", this.onPointerMove);

    const { offsetX, offsetY } = event;
    this.start.set(offsetX, offsetY, 0.5);
    this.start = this.screenToPlane(this.start);
    this.delta.set(0, 0, 0);
    this.end.set(0, 0, 0);
  };

  onPointerUp = (event: PointerEvent) => {
    this.viewer.removeEventListener("pointermove", this.onPointerMove);

    if (this.end.length() === 0) {
      const plane: THREE.Plane = this.plane;
      plane.normal.multiplyScalar(-1);
      plane.constant *= -1;
    } else {
      const { offsetX, offsetY } = event;
      this.end.set(offsetX, offsetY, 0.5);
      this.end = this.screenToPlane(this.end);
    }
  };

  onPointerMove = (event: PointerEvent) => {
    const { offsetX, offsetY } = event;
    this.end.set(offsetX, offsetY, 0.5);
    this.end = this.screenToPlane(this.end);
    this.delta.copy(this.end).sub(this.start);
    this.start.copy(this.end);

    const plane: THREE.Plane = this.plane;
    plane.translate(this.delta);
  };

  update() {}

  screenToWorld(v: THREE.Vector3) {
    v.x = (2 * v.x) / this.viewer.canvas.clientWidth - 1;
    v.y = 1 - (2 * v.y) / this.viewer.canvas.clientHeight;
    return v.unproject(this.viewer.camera);
  }

  screenToPlane(v: THREE.Vector3) {
    v = this.screenToWorld(v);
    const direction = v.sub(this.viewer.camera.position).normalize();
    const ray = new THREE.Ray(this.viewer.camera.position, direction);
    let plane: THREE.Plane = new THREE.Plane(new THREE.Vector3(0, 0, 1), 0);
    const dot = plane.normal.dot(this.plane.normal);
    if (Math.abs(dot) === 1) {
      plane = new THREE.Plane(new THREE.Vector3(1, 0, 0), 0);
    }
    const result = new THREE.Vector3();
    ray.intersectPlane(plane, result);
    return result;
  }
}