import 'element-behaviors'
import {MeshPhysicalMaterial} from 'three/src/materials/MeshPhysicalMaterial.js'
import {NoBlending /*, DoubleSide*/} from 'three/src/constants.js'
import {PhysicalMaterialBehavior} from './PhysicalMaterialBehavior.js'
import type {ElementWithBehaviors} from 'element-behaviors'

/**
 * @class MixedPlaneMaterialBehavior -
 *
 * Used as the material for [`<lume-mixed-plane>`](../../../meshes/MixedPlane) elements.
 *
 * <live-code src="../../../../../examples/buttons-with-shadow/example.html"></live-code>
 *
 * @extends PhysicalMaterialBehavior
 */
export class MixedPlaneMaterialBehavior extends PhysicalMaterialBehavior {
	constructor(element: ElementWithBehaviors) {
		super(element)

		// TODO, these should be class field overrides instead of constructor
		// properties, so that they include new defaults for attribute removal
		// from the decorators. At the moment, it isn't easy to override color
		// because it is a getter/setter and we have to copy over the logic,
		// which fails because the getter is accessed in the super class before
		// this subclass has a chance to define its private fields.

		/**
		 * @property {number} materialOpacity -
		 *
		 * `override` `attribute`
		 *
		 * Default: `0.3`
		 *
		 * Overrides
		 * [`PhysicalMaterialBehavior.materialOpacity`](./PhysicalMaterialBehavior#materialOpacity)
		 * to give mixed planes a nice default for viewing DOM content behind
		 * the WebGL canvas, while allowing some light to be caught on the
		 * partially opaque surface for effect. This may require tweaking
		 * depending on lighting and colors.
		 */
		this.materialOpacity = 0.3

		/**
		 * @property {number} materialOpacity -
		 *
		 * `override` `attribute`
		 *
		 * Default: `0.3`
		 *
		 * Overrides [`PhysicalMaterialBehavior.color`](./PhysicalMaterialBehavior#color) to
		 * give mixed planes a default tinted transparent surface over regular
		 * DOM content, on which light effects can be drawn.
		 */
		this.color = '#444'
	}

	override _createComponent() {
		return new MeshPhysicalMaterial({blending: NoBlending})
	}
}

if (globalThis.window?.document && !elementBehaviors.has('mixedplane-material'))
	elementBehaviors.define('mixedplane-material', MixedPlaneMaterialBehavior)