import { Behaviour, FrameEvent } from "@needle-tools/engine";

export class Rotate extends Behaviour {

    start() {
        // the second argument is optional and allows you to specifiy
        // when it should be called in the current frame loop
        // coroutine events are called after regular component events of the same name
        // for example: Update coroutine events are called after component.update() functions
        this.startCoroutine(this.rotate(), FrameEvent.Update);
    }

    // this method is called every frame until the component is disabled
    *rotate() {
        // keep looping forever
        while (true) {
            yield;
        }
    }
}

// this can be put into e.g. main.ts or a svelte component (similar to onMount)
import { onStart, onUpdate, onBeforeRender, onAfterRender } from "@needle-tools/engine"

onStart(ctx => console.log("Hello Scene", ctx.scene));

onUpdate(ctx => {
    // do something... e.g. access the frame # or deltatime via ctx.time
    console.log("UPDATE", ctx.time.frame);
});

onBeforeRender(ctx => {
    // this event is only called once because of the { once: true } argument
    console.log("ON BEFORE RENDER", ctx.time.frame);
}, { once: true } );

// Every event hook returns a method to unsubscribe from the event
const unsubscribe = onAfterRender(ctx => {
    console.log("ON AFTER RENDER", ctx.time.frame);
});
// Unsubscribe from the event at any time
setTimeout(()=> unsubscribe(), 1000);

import { Behaviour, GameObject, Renderer } from "@needle-tools/engine";

export class MyComponent extends Behaviour {

    start() {
        const renderer = GameObject.getComponentInParent(this.gameObject, Renderer);
        console.log(renderer);
    }
}

for(let i = 0; i < this.gameObject.children; i++)
    console.log(this.gameObject.children[i]);

for(const child of this.gameObject.children) {
    console.log(child);
}

import { Object3D } from "three";
this.gameObject.traverse((obj: Object3D) => console.log(obj));

import { Renderer } from "@needle-tools/engine";
for(const renderer of this.gameObject.getComponentsInChildren(Renderer))
    console.log(renderer);

import { Behaviour } from "@needle-tools/engine";
export class MyScript extends Behaviour
{
    onPointerDown() {
        console.log("POINTER DOWN on " + this.gameObject.name);
    }
}

import { Behaviour, InputEvents, NEPointerEvent } from "@needle-tools/engine";

export class MyScript extends Behaviour
{
    onEnable() {
        this.context.input.addEventListener(InputEvents.PointerDown, this.inputPointerDown);
    }

    onDisable() {
        // it is recommended to also unsubscribe from events when your component becomes inactive
        this.context.input.removeEventListener(InputEvents.PointerDown, this.inputPointerDown);
    }

    // @nonSerialized
    inputPointerDown = (evt: NEPointerEvent) => { console.log("POINTER DOWN anywhere on the <needle-engine> element"); }
}

import { Behaviour } from "@needle-tools/engine";
export class MyScript extends Behaviour
{
    update() {
        if(this.context.input.getPointerDown(0)){
            console.log("POINTER DOWN anywhere")
        }
    }
}

import { Behaviour } from "@needle-tools/engine";
export class MyScript extends Behaviour
{
    onEnable() {
        window.addEventListener("click", this.windowClick);
    }

    onDisable() {
        // unsubscribe again when the component is disabled
        window.removeEventListener("click", this.windowClick);
    }

    windowClick = () => { console.log("CLICK anywhere on the page, not just on <needle-engine>"); }
}

const hit = this.context.physics.engine?.raycast();

class YourComponentType extends Behaviour {}
//---cut---
import { NeedleEngine, GameObject, Behaviour } from "@needle-tools/engine";

NeedleEngine.addContextCreatedCallback((args) => {
  const context = args.context;
  const scene = context.scene;
  const myInstance = GameObject.getComponentInChildren(scene, YourComponentType);
});

import { Behaviour, serializable, Camera } from "@needle-tools/engine";
import { Object3D } from "three"

export class MyClass extends Behaviour {
    // this will be a "Transform" field in Unity
    @serializable(Object3D) 
    myObjectReference: Object3D | null = null;
    
    // this will be a "Transform" array field in Unity
    // Note that the @serializable decorator contains the array content type! (Object3D and not Object3D[])
    @serializable(Object3D) 
    myObjectReferenceList: Object3D[] | null = null;

    // for component or other objects use the object's type
    @serializable(Camera)
    myCameraComponent: Camera | null = null;
}

import { Behaviour, serializable, AssetReference } from "@needle-tools/engine";

export class MyClass extends Behaviour {

    // if you export a prefab or scene as a reference from Unity you'll get a path to that asset
    // which you can de-serialize to AssetReference for convenient loading
    @serializable(AssetReference)
    myPrefab?: AssetReference;
    
    async start() {
      // directly instantiate
      const myInstance = await this.myPrefab?.instantiate();

      // you can also just load and instantiate later
      // const myInstance = await this.myPrefab.loadAssetAsync();
      // this.gameObject.add(myInstance)
      // this is useful if you know that you want to load this asset only once because it will not create a copy
      // since ``instantiate()`` does create a copy of the asset after loading it
    }  
}