/**
 * @title input-pointer
 * @category input
 * @thumbnail https://mdn.alipayobjects.com/merchant_appfe/afts/img/A*t7xZRok9NpEAAAAAAAAAAAAADiR2AQ/original
 */
import {
  BlinnPhongMaterial,
  BoxColliderShape,
  Camera,
  MeshRenderer,
  PointLight,
  PrimitiveMesh,
  Script,
  StaticCollider,
  Vector2,
  Pointer,
  Entity,
  Vector3,
  WebGLEngine,
} from "@galacean/engine";
import { LitePhysics } from "@galacean/engine-physics-lite";

// Create engine
WebGLEngine.create({ canvas: "canvas", physics: new LitePhysics() }).then(
  (engine) => {
    engine.canvas.resizeByClientSize();
    const invCanvasWidth = 1 / engine.canvas.width;
    const invCanvasHeight = 1 / engine.canvas.height;
    // @ts-ignore
    const inputManager = engine.inputManager;
    const scene = engine.sceneManager.activeScene;
    const rootEntity = scene.createRootEntity("root");

    scene.ambientLight.diffuseSolidColor.set(1, 1, 1, 1);
    scene.ambientLight.diffuseIntensity = 1.2;

    // init camera
    const cameraEntity = rootEntity.createChild("camera");
    const camera = cameraEntity.addComponent(Camera);
    cameraEntity.transform.setPosition(10, 10, 10);
    cameraEntity.transform.lookAt(new Vector3(0, 0, 0));

    // init point light
    let light = rootEntity.createChild("light1");
    light.transform.setPosition(-8, -2, 8);
    light.addComponent(PointLight).intensity = 0.12;

    light = rootEntity.createChild("light2");
    light.transform.setPosition(8, -2, 0);
    light.addComponent(PointLight).intensity = 0.12;

    class PanScript extends Script {
      private startPointerPos = new Vector3();
      private tempVec2: Vector2 = new Vector2();
      private tempVec3: Vector3 = new Vector3();
      private zValue: number = 0;

      onPointerDown(pointer: Pointer) {
        this.zValue = camera.worldToViewportPoint(
          this.entity.transform.worldPosition,
          this.tempVec3
        ).z;
        const { tempVec2, tempVec3 } = this;
        tempVec2.copyFrom(pointer.position);
        tempVec3.set(
          tempVec2.x * invCanvasWidth,
          tempVec2.y * invCanvasHeight,
          this.zValue
        );
        camera.viewportToWorldPoint(tempVec3, this.startPointerPos);
      }

      onPointerDrag(pointer: Pointer) {
        const { tempVec2, tempVec3, startPointerPos } = this;
        const { transform } = this.entity;
        tempVec2.copyFrom(pointer.position);
        tempVec3.set(
          tempVec2.x * invCanvasWidth,
          tempVec2.y * invCanvasHeight,
          this.zValue
        );
        camera.viewportToWorldPoint(tempVec3, tempVec3);
        Vector3.subtract(tempVec3, startPointerPos, startPointerPos);
        transform.worldPosition.add(startPointerPos);
        startPointerPos.copyFrom(tempVec3);
      }
    }

    class ClickScript extends Script {
      private material: BlinnPhongMaterial;
      onStart() {
        this.material = <BlinnPhongMaterial>(
          this.entity.getComponent(MeshRenderer).getInstanceMaterial()
        );
      }

      onPointerClick() {
        this.material.baseColor.set(
          Math.random(),
          Math.random(),
          Math.random(),
          1.0
        );
      }
    }

    class EnterExitScript extends Script {
      private material: BlinnPhongMaterial;
      onStart() {
        this.material = <BlinnPhongMaterial>(
          this.entity.getComponent(MeshRenderer).getInstanceMaterial()
        );
      }

      onPointerEnter() {
        this.material.baseColor.set(
          Math.random(),
          Math.random(),
          Math.random(),
          1.0
        );
      }

      onPointerExit() {
        this.material.baseColor.set(
          Math.random(),
          Math.random(),
          Math.random(),
          1.0
        );
      }
    }

    function createBox(x: number, y: number, z: number): Entity {
      // create box test entity
      const cubeSize = 2.0;
      const boxEntity = rootEntity.createChild("BoxEntity");
      boxEntity.transform.setPosition(x, y, z);

      const boxMtl = new BlinnPhongMaterial(engine);
      const boxRenderer = boxEntity.addComponent(MeshRenderer);
      boxMtl.baseColor.set(0.6, 0.3, 0.3, 1.0);
      boxRenderer.mesh = PrimitiveMesh.createCuboid(
        engine,
        cubeSize,
        cubeSize,
        cubeSize
      );
      boxRenderer.setMaterial(boxMtl);

      const boxCollider: StaticCollider =
        boxEntity.addComponent(StaticCollider);
      const boxColliderShape = new BoxColliderShape();
      boxColliderShape.size.set(cubeSize, cubeSize, cubeSize);
      boxCollider.addShape(boxColliderShape);
      return boxEntity;
    }
    createBox(0, 0, 0).addComponent(PanScript);
    createBox(3, 0, -3).addComponent(ClickScript);
    createBox(-3, 0, 3).addComponent(EnterExitScript);

    // Run engine
    engine.run();
  }
);