<template>
	<view>
		<slot v-if="!nodes.length" />
		<!--#ifdef APP-PLUS-NVUE-->
		<web-view id="_top" ref="web" :style="'margin-top:-2px;height:'+height+'px'" @onPostMessage="_message" />
		<!--#endif-->
		<!--#ifndef APP-PLUS-NVUE-->
		<view id="_top" :style="showAm+(selectable?';user-select:text;-webkit-user-select:text':'')">
			<!--#ifdef H5 || MP-360-->
			<div :id="'rtf'+uid"></div>
			<!--#endif-->
			<!--#ifndef H5 || MP-360-->
			<trees :nodes="nodes" :lazyLoad="lazyLoad" :loading="loadingImg" />
			<!--#endif-->
		</view>
		<!--#endif-->
	</view>
</template>

<script>
	// #ifndef H5 || APP-PLUS-NVUE || MP-360
	import trees from './libs/trees';
	var cache = {},
		// #ifdef MP-WEIXIN || MP-TOUTIAO
		fs = uni.getFileSystemManager ? uni.getFileSystemManager() : null,
		// #endif
		Parser = require('./libs/MpHtmlParser.js');
	var dom;
	// 计算 cache 的 key
	function hash(str) {
		for (var i = str.length, val = 5381; i--;)
			val += (val << 5) + str.charCodeAt(i);
		return val;
	}
	// #endif
	// #ifdef H5 || APP-PLUS-NVUE || MP-360
	var {
		windowWidth,
		platform
	} = uni.getSystemInfoSync(),
		cfg = require('./libs/config.js');
	// #endif
	// #ifdef APP-PLUS-NVUE
	var weexDom = weex.requireModule('dom');
	// #endif
	/**
	 * Parser 富文本组件
	 * @tutorial https://github.com/jin-yufeng/Parser
	 * @property {String} html 富文本数据
	 * @property {Boolean} autopause 是否在播放一个视频时自动暂停其他视频
	 * @property {Boolean} autoscroll 是否自动给所有表格添加一个滚动层
	 * @property {Boolean} autosetTitle 是否自动将 title 标签中的内容设置到页面标题
	 * @property {Number} compress 压缩等级
	 * @property {String} domain 图片、视频等链接的主域名
	 * @property {Boolean} lazyLoad 是否开启图片懒加载
	 * @property {String} loadingImg 图片加载完成前的占位图
	 * @property {Boolean} selectable 是否开启长按复制
	 * @property {Object} tagStyle 标签的默认样式
	 * @property {Boolean} showWithAnimation 是否使用渐显动画
	 * @property {Boolean} useAnchor 是否使用锚点
	 * @property {Boolean} useCache 是否缓存解析结果
	 * @event {Function} parse 解析完成事件
	 * @event {Function} load dom 加载完成事件
	 * @event {Function} ready 所有图片加载完毕事件
	 * @event {Function} error 错误事件
	 * @event {Function} imgtap 图片点击事件
	 * @event {Function} linkpress 链接点击事件
	 * @author JinYufeng
	 * @version 20200828
	 * @listens MIT
	 */
	export default {
		name: 'parser',
		data() {
			return {
				// #ifdef H5 || MP-360
				uid: this._uid,
				// #endif
				// #ifdef APP-PLUS-NVUE
				height: 1,
				// #endif
				// #ifndef APP-PLUS-NVUE
				showAm: '',
				// #endif
				nodes: []
			}
		},
		// #ifndef H5 || APP-PLUS-NVUE || MP-360
		components: {
			trees
		},
		// #endif
		props: {
			html: String,
			autopause: {
				type: Boolean,
				default: true
			},
			autoscroll: Boolean,
			autosetTitle: {
				type: Boolean,
				default: true
			},
			// #ifndef H5 || APP-PLUS-NVUE || MP-360
			compress: Number,
			loadingImg: String,
			useCache: Boolean,
			// #endif
			domain: String,
			lazyLoad: Boolean,
			selectable: Boolean,
			tagStyle: Object,
			showWithAnimation: Boolean,
			useAnchor: Boolean
		},
		watch: {
			html(html) {
				this.setContent(html);
			}
		},
		created() {
			// 图片数组
			this.imgList = [];
			this.imgList.each = function(f) {
				for (var i = 0, len = this.length; i < len; i++)
					this.setItem(i, f(this[i], i, this));
			}
			this.imgList.setItem = function(i, src) {
				if (i == void 0 || !src) return;
				// #ifndef MP-ALIPAY || APP-PLUS
				// 去重
				if (src.indexOf('http') == 0 && this.includes(src)) {
					var newSrc = src.split('://')[0];
					for (var j = newSrc.length, c; c = src[j]; j++) {
						if (c == '/' && src[j - 1] != '/' && src[j + 1] != '/') break;
						newSrc += Math.random() > 0.5 ? c.toUpperCase() : c;
					}
					newSrc += src.substr(j);
					return this[i] = newSrc;
				}
				// #endif
				this[i] = src;
				// 暂存 data src
				if (src.includes('data:image')) {
					var filePath, info = src.match(/data:image\/(\S+?);(\S+?),(.+)/);
					if (!info) return;
					// #ifdef MP-WEIXIN || MP-TOUTIAO
					filePath = `${wx.env.USER_DATA_PATH}/${Date.now()}.${info[1]}`;
					fs && fs.writeFile({
						filePath,
						data: info[3],
						encoding: info[2],
						success: () => this[i] = filePath
					})
					// #endif
					// #ifdef APP-PLUS
					filePath = `_doc/parser_tmp/${Date.now()}.${info[1]}`;
					var bitmap = new plus.nativeObj.Bitmap();
					bitmap.loadBase64Data(src, () => {
						bitmap.save(filePath, {}, () => {
							bitmap.clear()
							this[i] = filePath;
						})
					})
					// #endif
				}
			}
		},
		mounted() {
			// #ifdef H5 || MP-360
			this.document = document.getElementById('rtf' + this._uid);
			// #endif
			// #ifndef H5 || APP-PLUS-NVUE || MP-360
			if (dom) this.document = new dom(this);
			// #endif
			// #ifdef APP-PLUS-NVUE
			this.document = this.$refs.web;
			setTimeout(() => {
				// #endif
				if (this.html) this.setContent(this.html);
				// #ifdef APP-PLUS-NVUE
			}, 30)
			// #endif
		},
		beforeDestroy() {
			// #ifdef H5 || MP-360
			if (this._observer) this._observer.disconnect();
			// #endif
			this.imgList.each(src => {
				// #ifdef APP-PLUS
				if (src && src.includes('_doc')) {
					plus.io.resolveLocalFileSystemURL(src, entry => {
						entry.remove();
					});
				}
				// #endif
				// #ifdef MP-WEIXIN || MP-TOUTIAO
				if (src && src.includes(uni.env.USER_DATA_PATH))
					fs && fs.unlink({
						filePath: src
					})
				// #endif
			})
			clearInterval(this._timer);
		},
		methods: {
			// 设置富文本内容
			setContent(html, append) {
				// #ifdef APP-PLUS-NVUE
				if (!html)
					return this.height = 1;
				if (append)
					this.$refs.web.evalJs("var b=document.createElement('div');b.innerHTML='" + html.replace(/'/g, "\\'") +
						"';document.getElementById('parser').appendChild(b)");
				else {
					html =
						'<meta charset="utf-8" /><meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no"><style>html,body{width:100%;height:100%;overflow:hidden}body{margin:0}</style><base href="' +
						this.domain + '"><div id="parser"' + (this.selectable ? '>' : ' style="user-select:none">') + this._handleHtml(html).replace(/\n/g, '\\n') +
						'</div><script>"use strict";function e(e){if(window.__dcloud_weex_postMessage||window.__dcloud_weex_){var t={data:[e]};window.__dcloud_weex_postMessage?window.__dcloud_weex_postMessage(t):window.__dcloud_weex_.postMessage(JSON.stringify(t))}}document.body.onclick=function(){e({action:"click"})},' +
						(this.showWithAnimation ? 'document.body.style.animation="_show .5s",' : '') +
						'setTimeout(function(){e({action:"load",text:document.body.innerText,height:document.getElementById("parser").scrollHeight})},50);\x3c/script>';
					if (platform == 'android') html = html.replace(/%/g, '%25');
					this.$refs.web.evalJs("document.write('" + html.replace(/'/g, "\\'") + "');document.close()");
				}
				this.$refs.web.evalJs(
					'var t=document.getElementsByTagName("title");t.length&&e({action:"getTitle",title:t[0].innerText});for(var o,n=document.getElementsByTagName("style"),r=1;o=n[r++];)o.innerHTML=o.innerHTML.replace(/body/g,"#parser");for(var a,c=document.getElementsByTagName("img"),s=[],i=0==c.length,d=0,l=0,g=0;a=c[l];l++)parseInt(a.style.width||a.getAttribute("width"))>' +
					windowWidth + '&&(a.style.height="auto"),a.onload=function(){++d==c.length&&(i=!0)},a.onerror=function(){++d==c.length&&(i=!0),' + (cfg.errorImg ? 'this.src="' + cfg.errorImg + '",' : '') +
					'e({action:"error",source:"img",target:this})},a.hasAttribute("ignore")||"A"==a.parentElement.nodeName||(a.i=g++,s.push(a.getAttribute("original-src")||a.src||a.getAttribute("data-src")),a.onclick=function(){e({action:"preview",img:{i:this.i,src:this.src}})});e({action:"getImgList",imgList:s});for(var u,m=document.getElementsByTagName("a"),f=0;u=m[f];f++)u.onclick=function(){var t,o=this.getAttribute("href");if("#"==o[0]){var n=document.getElementById(o.substr(1));n&&(t=n.offsetTop)}return e({action:"linkpress",href:o,offset:t}),!1};for(var h,y=document.getElementsByTagName("video"),v=0;h=y[v];v++)h.style.maxWidth="100%",h.onerror=function(){e({action:"error",source:"video",target:this})}' +
					(this.autopause ? ',h.onplay=function(){for(var e,t=0;e=y[t];t++)e!=this&&e.pause()}' : '') +
					';for(var _,p=document.getElementsByTagName("audio"),w=0;_=p[w];w++)_.onerror=function(){e({action:"error",source:"audio",target:this})};' +
					(this.autoscroll ? 'for(var T,E=document.getElementsByTagName("table"),B=0;T=E[B];B++){var N=document.createElement("div");N.style.overflow="scroll",T.parentNode.replaceChild(N,T),N.appendChild(T)}' : '') +
					'var x=document.getElementById("parser");clearInterval(window.timer),window.timer=setInterval(function(){i&&clearInterval(window.timer),e({action:"ready",ready:i,height:x.scrollHeight})},350)'
				)
				this.nodes = [1];
				// #endif
				// #ifdef H5 || MP-360
				if (!html) {
					if (this.rtf && !append) this.rtf.parentNode.removeChild(this.rtf);
					return;
				}
				var div = document.createElement('div');
				if (!append) {
					if (this.rtf) this.rtf.parentNode.removeChild(this.rtf);
					this.rtf = div;
				} else {
					if (!this.rtf) this.rtf = div;
					else this.rtf.appendChild(div);
				}
				div.innerHTML = this._handleHtml(html, append);
				for (var styles = this.rtf.getElementsByTagName('style'), i = 0, style; style = styles[i++];) {
					style.innerHTML = style.innerHTML.replace(/body/g, '#rtf' + this._uid);
					style.setAttribute('scoped', 'true');
				}
				// 懒加载
				if (!this._observer && this.lazyLoad && IntersectionObserver) {
					this._observer = new IntersectionObserver(changes => {
						for (let item, i = 0; item = changes[i++];) {
							if (item.isIntersecting) {
								item.target.src = item.target.getAttribute('data-src');
								item.target.removeAttribute('data-src');
								this._observer.unobserve(item.target);
							}
						}
					}, {
						rootMargin: '500px 0px 500px 0px'
					})
				}
				var _ts = this;
				// 获取标题
				var title = this.rtf.getElementsByTagName('title');
				if (title.length && this.autosetTitle)
					uni.setNavigationBarTitle({
						title: title[0].innerText
					})
				// 图片处理
				this.imgList.length = 0;
				var imgs = this.rtf.getElementsByTagName('img');
				for (let i = 0, j = 0, img; img = imgs[i]; i++) {
					if (parseInt(img.style.width || img.getAttribute('width')) > windowWidth)
						img.style.height = 'auto';
					var src = img.getAttribute('src');
					if (this.domain && src) {
						if (src[0] == '/') {
							if (src[1] == '/')
								img.src = (this.domain.includes('://') ? this.domain.split('://')[0] : '') + ':' + src;
							else img.src = this.domain + src;
						} else if (!src.includes('://')) img.src = this.domain + '/' + src;
					}
					if (!img.hasAttribute('ignore') && img.parentElement.nodeName != 'A') {
						img.i = j++;
						_ts.imgList.push(img.getAttribute('original-src') || img.src || img.getAttribute('data-src'));
						img.onclick = function() {
							var preview = true;
							this.ignore = () => preview = false;
							_ts.$emit('imgtap', this);
							if (preview) {
								uni.previewImage({
									current: this.i,
									urls: _ts.imgList
								});
							}
						}
					}
					img.onerror = function() {
						if (cfg.errorImg)
							_ts.imgList[this.i] = this.src = cfg.errorImg;
						_ts.$emit('error', {
							source: 'img',
							target: this
						});
					}
					if (_ts.lazyLoad && this._observer && img.src && img.i != 0) {
						img.setAttribute('data-src', img.src);
						img.removeAttribute('src');
						this._observer.observe(img);
					}
				}
				// 链接处理
				var links = this.rtf.getElementsByTagName('a');
				for (var link of links) {
					link.onclick = function() {
						var jump = true,
							href = this.getAttribute('href');
						_ts.$emit('linkpress', {
							href,
							ignore: () => jump = false
						});
						if (jump && href) {
							if (href[0] == '#') {
								if (_ts.useAnchor) {
									_ts.navigateTo({
										id: href.substr(1)
									})
								}
							} else if (href.indexOf('http') == 0 || href.indexOf('//') == 0)
								return true;
							else
								uni.navigateTo({
									url: href
								})
						}
						return false;
					}
				}
				// 视频处理
				var videos = this.rtf.getElementsByTagName('video');
				_ts.videoContexts = videos;
				for (let video, i = 0; video = videos[i++];) {
					video.style.maxWidth = '100%';
					video.onerror = function() {
						_ts.$emit('error', {
							source: 'video',
							target: this
						});
					}
					video.onplay = function() {
						if (_ts.autopause)
							for (let item, i = 0; item = _ts.videoContexts[i++];)
								if (item != this) item.pause();
					}
				}
				// 音频处理
				var audios = this.rtf.getElementsByTagName('audio');
				for (var audio of audios)
					audio.onerror = function() {
						_ts.$emit('error', {
							source: 'audio',
							target: this
						});
					}
				// 表格处理
				if (this.autoscroll) {
					var tables = this.rtf.getElementsByTagName('table');
					for (var table of tables) {
						let div = document.createElement('div');
						div.style.overflow = 'scroll';
						table.parentNode.replaceChild(div, table);
						div.appendChild(table);
					}
				}
				if (!append) this.document.appendChild(this.rtf);
				this.$nextTick(() => {
					this.nodes = [1];
					this.$emit('load');
				});
				setTimeout(() => this.showAm = '', 500);
				// #endif
				// #ifndef APP-PLUS-NVUE
				// #ifndef H5 || MP-360
				var nodes;
				if (!html) return this.nodes = [];
				var parser = new Parser(html, this);
				// 缓存读取
				if (this.useCache) {
					var hashVal = hash(html);
					if (cache[hashVal])
						nodes = cache[hashVal];
					else {
						nodes = parser.parse();
						cache[hashVal] = nodes;
					}
				} else nodes = parser.parse();
				this.$emit('parse', nodes);
				if (append) this.nodes = this.nodes.concat(nodes);
				else this.nodes = nodes;
				if (nodes.length && nodes.title && this.autosetTitle)
					uni.setNavigationBarTitle({
						title: nodes.title
					})
				if (this.imgList) this.imgList.length = 0;
				this.videoContexts = [];
				this.$nextTick(() => {
					(function f(cs) {
						for (var i = cs.length; i--;) {
							if (cs[i].top) {
								cs[i].controls = [];
								cs[i].init();
								f(cs[i].$children);
							}
						}
					})(this.$children)
					this.$emit('load');
				})
				// #endif
				var height;
				clearInterval(this._timer);
				this._timer = setInterval(() => {
					// #ifdef H5 || MP-360
					this.rect = this.rtf.getBoundingClientRect();
					// #endif
					// #ifndef H5 || MP-360
					uni.createSelectorQuery().in(this)
						.select('#_top').boundingClientRect().exec(res => {
							if (!res) return;
							this.rect = res[0];
							// #endif
							if (this.rect.height == height) {
								this.$emit('ready', this.rect)
								clearInterval(this._timer);
							}
							height = this.rect.height;
							// #ifndef H5 || MP-360
						});
					// #endif
				}, 350);
				if (this.showWithAnimation && !append) this.showAm = 'animation:_show .5s';
				// #endif
			},
			// 获取文本内容
			getText(ns = this.nodes) {
				var txt = '';
				// #ifdef APP-PLUS-NVUE
				txt = this._text;
				// #endif
				// #ifdef H5 || MP-360
				txt = this.rtf.innerText;
				// #endif
				// #ifndef H5 || APP-PLUS-NVUE || MP-360
				for (var i = 0, n; n = ns[i++];) {
					if (n.type == 'text') txt += n.text.replace(/&nbsp;/g, '\u00A0').replace(/&lt;/g, '<').replace(/&gt;/g, '>')
						.replace(/&amp;/g, '&');
					else if (n.type == 'br') txt += '\n';
					else {
						// 块级标签前后加换行
						var block = n.name == 'p' || n.name == 'div' || n.name == 'tr' || n.name == 'li' || (n.name[0] == 'h' && n.name[1] >
							'0' && n.name[1] < '7');
						if (block && txt && txt[txt.length - 1] != '\n') txt += '\n';
						if (n.children) txt += this.getText(n.children);
						if (block && txt[txt.length - 1] != '\n') txt += '\n';
						else if (n.name == 'td' || n.name == 'th') txt += '\t';
					}
				}
				// #endif
				return txt;
			},
			// 锚点跳转
			in (obj) {
				if (obj.page && obj.selector && obj.scrollTop) this._in = obj;
			},
			navigateTo(obj) {
				if (!this.useAnchor) return obj.fail && obj.fail('Anchor is disabled');
				// #ifdef APP-PLUS-NVUE
				if (!obj.id)
					weexDom.scrollToElement(this.$refs.web);
				else
					this.$refs.web.evalJs('var pos=document.getElementById("' + obj.id +
						'");if(pos)post({action:"linkpress",href:"#",offset:pos.offsetTop+' + (obj.offset || 0) + '})');
				obj.success && obj.success();
				// #endif
				// #ifndef APP-PLUS-NVUE
				var d = ' ';
				// #ifdef MP-WEIXIN || MP-QQ || MP-TOUTIAO
				d = '>>>';
				// #endif
				var selector = uni.createSelectorQuery().in(this._in ? this._in.page : this).select((this._in ? this._in.selector :
					'#_top') + (obj.id ? `${d}#${obj.id},${this._in?this._in.selector:'#_top'}${d}.${obj.id}` : '')).boundingClientRect();
				if (this._in) selector.select(this._in.selector).scrollOffset().select(this._in.selector).boundingClientRect();
				else selector.selectViewport().scrollOffset();
				selector.exec(res => {
					if (!res[0]) return obj.fail && obj.fail('Label not found')
					var scrollTop = res[1].scrollTop + res[0].top - (res[2] ? res[2].top : 0) + (obj.offset || 0);
					if (this._in) this._in.page[this._in.scrollTop] = scrollTop;
					else uni.pageScrollTo({
						scrollTop,
						duration: 300
					})
					obj.success && obj.success();
				})
				// #endif
			},
			// 获取视频对象
			getVideoContext(id) {
				// #ifndef APP-PLUS-NVUE
				if (!id) return this.videoContexts;
				else
					for (var i = this.videoContexts.length; i--;)
						if (this.videoContexts[i].id == id) return this.videoContexts[i];
				// #endif
			},
			// #ifdef H5 || APP-PLUS-NVUE || MP-360
			_handleHtml(html, append) {
				if (!append) {
					// 处理 tag-style 和 userAgentStyles
					var style = '<style>@keyframes _show{0%{opacity:0}100%{opacity:1}}img{max-width:100%}';
					for (var item in cfg.userAgentStyles)
						style += `${item}{${cfg.userAgentStyles[item]}}`;
					for (item in this.tagStyle)
						style += `${item}{${this.tagStyle[item]}}`;
					style += '</style>';
					html = style + html;
				}
				// 处理 rpx
				if (html.includes('rpx'))
					html = html.replace(/[0-9.]+\s*rpx/g, $ => (parseFloat($) * windowWidth / 750) + 'px');
				return html;
			},
			// #endif
			// #ifdef APP-PLUS-NVUE
			_message(e) {
				// 接收 web-view 消息
				var d = e.detail.data[0];
				switch (d.action) {
					case 'load':
						this.$emit('load');
						this.height = d.height;
						this._text = d.text;
						break;
					case 'getTitle':
						if (this.autosetTitle)
							uni.setNavigationBarTitle({
								title: d.title
							})
						break;
					case 'getImgList':
						this.imgList.length = 0;
						for (var i = d.imgList.length; i--;)
							this.imgList.setItem(i, d.imgList[i]);
						break;
					case 'preview':
						var preview = true;
						d.img.ignore = () => preview = false;
						this.$emit('imgtap', d.img);
						if (preview)
							uni.previewImage({
								current: d.img.i,
								urls: this.imgList
							})
						break;
					case 'linkpress':
						var jump = true,
							href = d.href;
						this.$emit('linkpress', {
							href,
							ignore: () => jump = false
						})
						if (jump && href) {
							if (href[0] == '#') {
								if (this.useAnchor)
									weexDom.scrollToElement(this.$refs.web, {
										offset: d.offset
									})
							} else if (href.includes('://'))
								plus.runtime.openWeb(href);
							else
								uni.navigateTo({
									url: href
								})
						}
						break;
					case 'error':
						if (d.source == 'img' && cfg.errorImg)
							this.imgList.setItem(d.target.i, cfg.errorImg);
						this.$emit('error', {
							source: d.source,
							target: d.target
						})
						break;
					case 'ready':
						this.height = d.height;
						if (d.ready) uni.createSelectorQuery().in(this).select('#_top').boundingClientRect().exec(res => {
							this.rect = res[0];
							this.$emit('ready', res[0]);
						})
						break;
					case 'click':
						this.$emit('click');
						this.$emit('tap');
				}
			},
			// #endif
		}
	}
</script>

<style>
	@keyframes _show {
		0% {
			opacity: 0;
		}

		100% {
			opacity: 1;
		}
	}

	/* #ifdef MP-WEIXIN */
	:host {
		display: block;
		overflow: scroll;
		-webkit-overflow-scrolling: touch;
	}

	/* #endif */
</style>
