'use strict';

// 页面seo相关属性的配置文件
const seoMap = require('./seoConfig');

/**
 * 设置seo相关的数据，包括title, keywords, description
 * @param  {undefined}
 * @return {Function} 中间件函数，用于给res.locals对象添加属性
 */
module.exports = () => {
    return (req, res, next) => {
        if (!req.xhr) {
            let seo;

            if (req.tdk) {
                seo = {
                    title: req.tdk[1],
                    keywords: req.tdk[2],
                    description: req.tdk[3]
                };
            } else {
                seo = seoMap[req.path] || seoMap['/'];
            }
            Object.assign(res.locals, seo);
        }
        next();
    };
};