/*
 * LightController.js
 *
 * @author realor
 */

import { Controller } from './Controller.js'
import * as THREE from '../lib/three.module.js'

class LightController extends Controller {
    constructor(object, name) {
        super(object, name)
        this.input = 0
        this.minValue = 0
        this.maxValue = 1
        this.intensity = 1
        this.distance = 3
        this.offsetX = 0
        this.offsetY = 0
        this.offsetZ = 0

        this._onNodeChanged = this.onNodeChanged.bind(this)
        this._light = null
    }

    onStart() {
        this.createLight()
        this.update(true)
        this.application.addEventListener('scene', this._onNodeChanged)
    }

    onStop() {
        this.destroyLight()
        this.application.removeEventListener('scene', this._onNodeChanged)
    }

    onNodeChanged(event) {
        if (event.type === 'nodeChanged' && this.hasChanged(event)) {
            this.update(false)
        }
    }

    update(force) {
        let value = this.input
        let distance = this.distance
        let minValue = this.minValue
        let maxValue = this.maxValue
        let offsetX = this.offsetX
        let offsetY = this.offsetY
        let offsetZ = this.offsetZ

        let factor
        if (value <= minValue) {
            factor = 0
        } else if (value >= maxValue) {
            factor = 1
        } // interpolate factor
        else {
            factor = (value - minValue) / (maxValue - minValue) // [0..1]
        }

        let intensity = factor * this.intensity
        if (
            force ||
            this._light.intensity !== intensity ||
            this._light.distance !== distance ||
            this._light.position.x !== offsetX ||
            this._light.position.y !== offsetY ||
            this._light.position.z !== offsetZ
        ) {
            this._light.intensity = intensity
            this._light.distance = distance
            this._light.position.set(offsetX, offsetY, offsetZ)
            this._light.updateMatrix()
            this.application.notifyObjectsChanged(this.object, this)
        }
    }

    createLight() {
        this._light = new THREE.PointLight(0xffffff)
        const light = this._light
        light.name = 'light'
        light.userData.export = { export: false }
        this.application.addObject(light, this.object)
    }

    destroyLight() {
        this.application.removeObject(this._light, this.object)
        this._light = null
    }
}

Controller.addClass(LightController)

export { LightController }