import { nextTick } from 'vue';
import * as svg from '@element-plus/icons-vue';

// 获取阿里字体图标
const getAlicdnIconfont = () => {
	return new Promise((resolve, reject) => {
		nextTick(() => {
			const styles: any = document.styleSheets;
			let sheetsList = [] as any[];
			let sheetsIconList = [] as any[];
			for (let i = 0; i < styles.length; i++) {
				if (styles[i].href && styles[i].href.indexOf('at.alicdn.com') > -1) {
					sheetsList.push(styles[i]);
				}
			}
			for (let i = 0; i < sheetsList.length; i++) {
				for (let j = 0; j < sheetsList[i].cssRules.length; j++) {
					if (sheetsList[i].cssRules[j].selectorText && sheetsList[i].cssRules[j].selectorText.indexOf('.icon-') > -1) {
						sheetsIconList.push(
							`${sheetsList[i].cssRules[j].selectorText.substring(1, sheetsList[i].cssRules[j].selectorText.length).replace(/\:\:before/gi, '')}`
						);
					}
				}
			}
			if (sheetsIconList.length > 0) resolve(sheetsIconList);
			else reject('未获取到值，请刷新重试');
		});
	});
};

// 初始化获取 css 样式，获取 element plus 自带 svg 图标，增加了 ele- 前缀，使用时：ele-Aim
const getElementPlusIconfont = () => {
	return new Promise((resolve, reject) => {
		nextTick(() => {
			const icons = svg as any;
			const sheetsIconList = [] as any[];
			for (const i in icons) {
				sheetsIconList.push(`ele-${icons[i].name}`);
			}
			if (sheetsIconList.length > 0) resolve(sheetsIconList);
			else reject('未获取到值，请刷新重试');
		});
	});
};

// 初始化获取 css 样式，这里使用 fontawesome 的图标
const getAwesomeIconfont = () => {
	return new Promise((resolve, reject) => {
		nextTick(() => {
			const styles: any = document.styleSheets;
			let sheetsList = [] as any[];
			let sheetsIconList = [] as any[];
			for (let i = 0; i < styles.length; i++) {
				if (styles[i].href && styles[i].href.indexOf('font-awesome') > -1) {
					sheetsList.push(styles[i]);
				}
			}
			for (let i = 0; i < sheetsList.length; i++) {
				for (let j = 0; j < sheetsList[i].cssRules.length; j++) {
					if (
						sheetsList[i].cssRules[j].selectorText &&
						sheetsList[i].cssRules[j].selectorText.indexOf('.fa-') === 0 &&
						sheetsList[i].cssRules[j].selectorText.indexOf(',') === -1
					) {
						if (/::before/.test(sheetsList[i].cssRules[j].selectorText)) {
							sheetsIconList.push(
								`${sheetsList[i].cssRules[j].selectorText.substring(1, sheetsList[i].cssRules[j].selectorText.length).replace(/\:\:before/gi, '')}`
							);
						}
					}
				}
			}
			if (sheetsIconList.length > 0) resolve(sheetsIconList.reverse());
			else reject('未获取到值，请刷新重试');
		});
	});
};

/*
 * 获取本地自带的图标
 * /src/assets/icons文件夹内的svg文件
 */
const getLocalIconfontNames = () => {
	return new Promise<string[]>((resolve, reject) => {
		nextTick(() => {
			let iconfonts: string[] = [];

			const svgEl = document.getElementById('local-icon');
			if (svgEl?.dataset.iconName) {
				iconfonts = (svgEl?.dataset.iconName as string).split(',');
			}

			if (iconfonts.length > 0) {
				resolve(iconfonts);
			} else {
				reject('No Local Icons');
			}
		});
	});
};

/**
 * 获取字体图标 `document.styleSheets`
 * @method ali 获取阿里字体图标 `<i class="iconfont 图标类名"></i>`
 * @method ele 获取 element plus 自带图标 `<i class="图标类名"></i>`
 * @method ali 获取 fontawesome 的图标 `<i class="fa 图标类名"></i>`
 */
const initIconfont = {
	// iconfont
	ali: () => {
		return getAlicdnIconfont();
	},
	// element plus
	ele: () => {
		return getElementPlusIconfont();
	},
	// fontawesome
	awe: () => {
		return getAwesomeIconfont();
	},
	local: () => {
		return getLocalIconfontNames();
	},
};

// 导出方法
export default initIconfont;