import {UniformName} from './UniformsController';
import {PolyScene} from '../PolyScene';
import {IUniforms} from '../../../core/geometry/Material';
import {
	Scene,
	Object3D,
	Light,
	IUniform,
	// RectAreaLight,
} from 'three';
import {LightType, getLightType, AvailableLight, UniformsUpdateFunction} from './raymarching/_Base';
import {
	_resetSpotLightIndex,
	_updateUniformsWithSpotLight,
	SpotLightRayMarchingUniform,
	_createSpotLightUniform,
} from './raymarching/SpotLight';
import {
	_resetDirectionalLightIndex,
	_updateUniformsWithDirectionalLight,
	DirectionalLightRayMarchingUniform,
	_createDirectionalLightUniform,
} from './raymarching/DirectionalLight';
// import {
// 	_resetHemisphereLightIndex,
// 	_updateUniformsWithHemisphereLight,
// 	HemisphereLightRayMarchingUniform,
// 	_createHemisphereLightUniform,
// } from './raymarching/HemisphereLight';
import {
	_resetPointLightIndex,
	_updateUniformsWithPointLight,
	PointLightRayMarchingUniform,
	_createPointLightUniform,
} from './raymarching/PointLight';

function _updateUniformsFunctionForLight<L extends AvailableLight>(
	object: L
): UniformsUpdateFunction<AvailableLight> | undefined {
	const lightType = getLightType(object as Light);
	switch (lightType) {
		case LightType.SPOT: {
			return _updateUniformsWithSpotLight as UniformsUpdateFunction<AvailableLight>;
		}
		case LightType.DIRECTIONAL: {
			return _updateUniformsWithDirectionalLight as UniformsUpdateFunction<AvailableLight>;
		}
		// case LightType.HEMISPHERE: {
		// 	return _updateUniformsWithHemisphereLight as UniformsUpdateFunction<AvailableLight>;
		// }
		case LightType.POINT: {
			return _updateUniformsWithPointLight as UniformsUpdateFunction<AvailableLight>;
		}
	}
}
export class SceneTraverserController {
	private _spotLightsRayMarching: SpotLightRayMarchingUniform = {
		value: [],
	};
	private _directionalLightsRayMarching: DirectionalLightRayMarchingUniform = {
		value: [],
	};
	// private _hemisphereLightsRayMarching: HemisphereLightRayMarchingUniform = {
	// 	value: [],
	// };
	private _pointLightsRayMarching: PointLightRayMarchingUniform = {
		value: [],
	};
	// private _areaLightsRayMarching: AreaLightRayMarchingUniform = {
	// 	value: [],
	// 	// properties: {
	// 	// 	worldPos: {},
	// 	// },
	// };
	private _updateUniformsFunctionByLight: WeakMap<AvailableLight, UniformsUpdateFunction<AvailableLight>> =
		new WeakMap();
	private _uniformsByLight: WeakMap<Light, IUniform> = new WeakMap();
	constructor(protected scene: PolyScene) {}

	traverseScene(scene?: Scene) {
		_resetSpotLightIndex();
		_resetDirectionalLightIndex();
		// _resetHemisphereLightIndex();
		_resetPointLightIndex();
		scene = scene || this.scene.threejsScene();
		scene.traverse(this._onObjectTraverseBound);
	}
	private _onObjectTraverseBound = this._onObjectTraverse.bind(this);
	private _onObjectTraverse(object: Object3D) {
		let updateFunction = this._updateUniformsFunctionByLight.get(object as AvailableLight);

		if (!updateFunction) {
			if ((object as Light).isLight) {
				updateFunction = _updateUniformsFunctionForLight(object as AvailableLight);
				if (updateFunction) {
					this._updateUniformsFunctionByLight.set(object as AvailableLight, updateFunction);
				}
			}
		}
		if (!updateFunction) {
			return updateFunction;
		}
		let uniforms = this._uniformsByLight.get(object as Light);
		if (!uniforms) {
			uniforms = this._updateUniformsForLight(object as Light);
			if (uniforms) {
				this._uniformsByLight.set(object as Light, uniforms);
			}
		}
		if (!uniforms) {
			return;
		}
		updateFunction(object as AvailableLight, uniforms);
	}
	private _updateUniformsForLight<L extends Light>(object: L) {
		const lightType = getLightType(object as Light);
		switch (lightType) {
			case LightType.SPOT: {
				return this._spotLightsRayMarching;
			}
			case LightType.DIRECTIONAL: {
				return this._directionalLightsRayMarching;
			}
			// case LightType.HEMISPHERE: {
			// 	return this._hemisphereLightsRayMarching;
			// }
			case LightType.POINT: {
				return this._pointLightsRayMarching;
			}
		}
	}

	addLightsRayMarchingUniform(uniforms: IUniforms) {
		uniforms[UniformName.SPOTLIGHTS_RAYMARCHING] = this._spotLightsRayMarching;
		uniforms[UniformName.DIRECTIONALLIGHTS_RAYMARCHING] = this._directionalLightsRayMarching;
		// uniforms[UniformName.HEMISPHERELIGHTS_RAYMARCHING] = this._hemisphereLightsRayMarching;
		uniforms[UniformName.POINTLIGHTS_RAYMARCHING] = this._pointLightsRayMarching;
		// uniforms[UniformName.AREALIGHTS_RAYMARCHING] = this._areaLightsRayMarching;
	}
	removeLightsRayMarchingUniform(uniforms: IUniforms) {
		delete uniforms[UniformName.SPOTLIGHTS_RAYMARCHING];
		delete uniforms[UniformName.DIRECTIONALLIGHTS_RAYMARCHING];
		// delete uniforms[UniformName.HEMISPHERELIGHTS_RAYMARCHING];
		delete uniforms[UniformName.POINTLIGHTS_RAYMARCHING];
		// uniforms[UniformName.AREALIGHTS_RAYMARCHING] = this._areaLightsRayMarching;
	}
}