import { nextTick } from 'vue';
import type { App } from 'vue';
import * as svg from '@element-plus/icons-vue';
import router from '/@/router/index';
import { store } from '/@/store/index';
import { i18n } from '/@/i18n/index';
import { Local } from '/@/utils/storage';
import SvgIcon from '/@/components/svgIcon/index.vue';

/**
 * 导出全局注册 element plus svg 图标
 * @param app vue 实例
 * @description 使用：https://element-plus.gitee.io/zh-CN/component/icon.html
 */
export function elSvg(app: App) {
	const icons = svg as any;
	for (const i in icons) {
		app.component(`element${icons[i].name}`, icons[i]);
	}
	app.component('SvgIcon', SvgIcon);
}

/**
 * 设置浏览器标题国际化
 * @method const title = useTitle(); ==> title()
 */
export function useTitle() {
	return () => {
		nextTick(() => {
			let webTitle = '';
			let globalTitle: string = store.state.themeConfig.themeConfig.globalTitle;
			router.currentRoute.value.path === '/login'
				? (webTitle = router.currentRoute.value.meta.title as any)
				: (webTitle = i18n.global.t(router.currentRoute.value.meta.title as any));
			document.title = `${webTitle} - ${globalTitle}` || globalTitle;
		});
	};
}

/**
 * 图片懒加载
 * @param el dom 目标元素
 * @param arr 列表数据
 * @description data-xxx 属性用于存储页面或应用程序的私有自定义数据
 */
export const lazyImg = (el: any, arr: any) => {
	const io = new IntersectionObserver((res) => {
		res.forEach((v: any) => {
			if (v.isIntersecting) {
				const { img, key } = v.target.dataset;
				v.target.src = img;
				v.target.onload = () => {
					io.unobserve(v.target);
					arr[key]['loading'] = false;
				};
			}
		});
	});
	nextTick(() => {
		document.querySelectorAll(el).forEach((img) => io.observe(img));
	});
};

/**
 * 全局组件大小
 * @returns 返回 `window.localStorage` 中读取的缓存值 `globalComponentSize`
 */
export function globalComponentSize() {
	return Local.get('themeConfig')?.globalComponentSize;
}

/**
 * 对象深克隆
 * @param obj 源对象
 * @returns 克隆后的对象
 */
export function deepClone(obj: any) {
	let newObj: any;
	try {
		newObj = obj.push ? [] : {};
	} catch (error) {
		newObj = {};
	}
	for (let attr in obj) {
		if (typeof obj[attr] === 'object') {
			newObj[attr] = deepClone(obj[attr]);
		} else {
			newObj[attr] = obj[attr];
		}
	}
	return newObj;
}

/**
 * 统一批量导出
 * @method elSvg 导出全局注册 element plus svg 图标
 * @method useTitle 设置浏览器标题国际化
 * @method lazyImg 图片懒加载
 * @method globalComponentSize element plus 全局组件大小
 * @method deepClone 对象深克隆
 */
const other = {
	elSvg: (app: App) => {
		elSvg(app);
	},
	useTitle: () => {
		useTitle();
	},
	lazyImg: (el: any, arr: any) => {
		lazyImg(el, arr);
	},
	globalComponentSize: () => {
		globalComponentSize();
	},
	deepClone: (obj: any) => {
		deepClone(obj);
	},
};

// 统一批量导出
export default other;
