const mongoose = require('mongoose');
const Schema = mongoose.Schema;

/* 过滤 HTML 标签 */
const striptags = require('striptags');

/* 转义 HTML 实体字符 */
const Entities = require('html-entities').AllHtmlEntities;
const entities = new Entities;

/* markdown */
const MarkdownIt = require('markdown-it');

const md = MarkdownIt()
	.use(require('markdown-it-footnote'))


const ArticleSchema = new Schema({
	status: { type: Number, default: 0 },

	title: { type: String, default: '(title)' },
	content: { type: String, default: '(empty)' },
	contentType: { type: String, default: 'text' },
	format: { type: String, default: '(format)' },
	tags: { type: Array, default: [] },

	date: { type: Date, default: Date.now },
	mod: { type: Date, default: Date.now },

});

const contentFormat = function () {
	if (this.contentType === 'markdown') {
		this.format = md.render(this.content);
	} else {
		/* 转 Text */
		this.format = `<pre><code>${entities.encode(this.content)}</code></pre>`;
	}
};

ArticleSchema.pre('save', function (next) {
	contentFormat.apply(this);

	if (!this.title.length) {
		this.title = '(无标题)';
	}

	let now = new Date;
	this.mod = now;

	next();
});

ArticleSchema.pre('update', function (next) {
	let set = this._update.$set;

	if (set.tags && !Array.isArray(set.tags)) {
		set.tags = [];
	}
	set.mod = new Date;

	if (set.contentType && set.content) {
		contentFormat.apply(this._update.$set);
	} else {
		delete set.contentType;
		delete set.content;
	}

	next();
});

mongoose.model('Article', ArticleSchema);

@@ -1291,16 +1291,26 @@
 tags = %5B
+ set.tags 
 %5D;%0A%09%7D%0A%09s

修复单个 tag 插入时无效的 bug