/* 引入Cesium */
// import * as Cesium from 'Cesium';

import SkyBoxOnGround from "../../Core/SkyBoxOnGround.js";

/**
 * 天空盒子
 */
class SkyBox {
	/**
	 * 默认初始化
	 * @param {Object} viewer 三维场景
	 */
	constructor(viewer) {
		if (!viewer) throw new Cesium.DeveloperError('no viewer object!');
		this._viewer = viewer;
		this._farSkyBox = viewer.scene.skyBox; //默认天空盒子,即远景天空盒子
	}
}

/**
 * 通用对外公开函数 
 */
Object.assign(SkyBox.prototype, /** @lends SkyBox.prototype */ {
	/**
	 * 自定义天空盒子
	 * @param {Object} options 具有以下属性:
	 * @param {Object} [options.type="蓝天"] 默认蓝天,晚霞,阴天,紫色星空,蓝色星空
	 * @param {Object} [options.sources] 天空盒子6个方向的图片地址(立方体全景图片)
	 * @param {String} [options.sources.positiveX] 
	 * @param {String} [options.sources.negativeX] 
	 * @param {String} [options.sources.positiveY] 
	 * @param {String} [options.sources.negativeY] 
	 * @param {String} [options.sources.positiveZ]
	 * @param {String} [options.sources.negativeZ] 
	 * @param {Number} [options.height=200000] 开始显示自定义天空盒子高度，默认=200000
	 * 
	 * @example
	 * setGroundSkyBox({
	 * 	type:"蓝天",
	 *	height:200000,
	 * 	sources: { //蓝天
	 * 		positiveX: 'http://support.supermap.com.cn:8090/webgl/examples/webgl/imgs/SkyBox/bluesky/Right.jpg',
	 * 		negativeX: 'http://support.supermap.com.cn:8090/webgl/examples/webgl/imgs/SkyBox/bluesky/Left.jpg',
	 * 		positiveY: 'http://support.supermap.com.cn:8090/webgl/examples/webgl/imgs/SkyBox/bluesky/Front.jpg',
	 * 		negativeY: 'http://support.supermap.com.cn:8090/webgl/examples/webgl/imgs/SkyBox/bluesky/Back.jpg',
	 * 		positiveZ: 'http://support.supermap.com.cn:8090/webgl/examples/webgl/imgs/SkyBox/bluesky/Up.jpg',
	 * 		negativeZ: 'http://support.supermap.com.cn:8090/webgl/examples/webgl/imgs/SkyBox/bluesky/Down.jpg',
	 * 	},
	 * });		
	 */
	setGroundSkyBox(options) {

		options = options || {};
		options.height = options.height || 200000;
		options.type = options.type || "蓝天";

		if (!options.sources) {
			switch (options.type) {
				case "晚霞":
					options.sources = {
						positiveX: 'jt3dSDK/imgs/skybox/01/px.png',
						negativeX: 'jt3dSDK/imgs/skybox/01/nx.png',
						positiveY: 'jt3dSDK/imgs/skybox/01/py.png',
						negativeY: 'jt3dSDK/imgs/skybox/01/ny.png',
						positiveZ: 'jt3dSDK/imgs/skybox/01/pz.png',
						negativeZ: 'jt3dSDK/imgs/skybox/01/nz.png',
					}
					break;
				case "阴天":
					options.sources = {
						positiveX: 'jt3dSDK/imgs/skybox/02/px.jpg',
						negativeX: 'jt3dSDK/imgs/skybox/02/nx.jpg',
						positiveY: 'jt3dSDK/imgs/skybox/02/py.jpg',
						negativeY: 'jt3dSDK/imgs/skybox/02/ny.jpg',
						positiveZ: 'jt3dSDK/imgs/skybox/02/pz.jpg',
						negativeZ: 'jt3dSDK/imgs/skybox/02/nz.jpg',
					}
					break;
				case "蓝天":
					options.sources = {
						positiveX: 'jt3dSDK/imgs/skybox/03/px.jpg',
						negativeX: 'jt3dSDK/imgs/skybox/03/nx.jpg',
						positiveY: 'jt3dSDK/imgs/skybox/03/py.jpg',
						negativeY: 'jt3dSDK/imgs/skybox/03/ny.jpg',
						positiveZ: 'jt3dSDK/imgs/skybox/03/pz.jpg',
						negativeZ: 'jt3dSDK/imgs/skybox/03/nz.jpg',
					}
					break;
				case "紫色星空":
					options.sources = {
						positiveX: 'jt3dSDK/imgs/skybox/04/px.jpg',
						negativeX: 'jt3dSDK/imgs/skybox/04/nx.jpg',
						positiveY: 'jt3dSDK/imgs/skybox/04/py.jpg',
						negativeY: 'jt3dSDK/imgs/skybox/04/ny.jpg',
						positiveZ: 'jt3dSDK/imgs/skybox/04/pz.jpg',
						negativeZ: 'jt3dSDK/imgs/skybox/04/nz.jpg',
					}
					break;
				case "蓝色星空":
					options.sources = {
						positiveX: 'jt3dSDK/imgs/skybox/05/px.jpg',
						negativeX: 'jt3dSDK/imgs/skybox/05/nx.jpg',
						positiveY: 'jt3dSDK/imgs/skybox/05/py.jpg',
						negativeY: 'jt3dSDK/imgs/skybox/05/ny.jpg',
						positiveZ: 'jt3dSDK/imgs/skybox/05/pz.jpg',
						negativeZ: 'jt3dSDK/imgs/skybox/05/nz.jpg',
					}
					break;
			}
		} else if (!Cesium.defined(options.sources.positiveX) ||
			!Cesium.defined(options.sources.negativeX) ||
			!Cesium.defined(options.sources.positiveY) ||
			!Cesium.defined(options.sources.negativeY) ||
			!Cesium.defined(options.sources.positiveZ) ||
			!Cesium.defined(options.sources.negativeZ)
		) {
			throw new Cesium.DeveloperError(
				"options.sources is required and must have positiveX, negativeX, positiveY, negativeY, positiveZ, and negativeZ properties."
			);
		}

		let _self = this;

		//自定义天空盒子（天空盒子需要显示）
		// let groundSkyBox = new Cesium.SkyBox({//自带的有bug，天空效果出现倾斜
		// 	sources: options.sources,
		// 	show: true
		// });

		let groundSkyBox = new SkyBoxOnGround({ //在源码基础上修改后的
			sources: options.sources,
			show: true
		});

		//如果高度小于某个值 显示近景天空盒 否则显示远景天空盒
		_self._viewer.scene.postRender.addEventListener(() => {
			var e = _self._viewer.camera.position;
			if (Cesium.Cartographic.fromCartesian(e).height < options.height) {
				_self._viewer.scene.skyBox = groundSkyBox; // 显示自定义的天空盒
			} else {
				_self._viewer.scene.skyBox = _self._defaultSkyBox; // 显示原始的天空盒
			}
		});
	}
});

export default SkyBox;