/**
 * 控制器基类
 *
 * @author CaiAoLin
 * @date 2017/6/29
 * @version
 */
import crypto from "crypto";
import Url from "url";
import Moment from "moment";
import menuData from "../../../config/menu";

class BaseController {

    /**
     * 页面title
     *
     * @var string
     */
    title = '';

    /**
     * 构造函数
     *
     * @return {void}
     */
    constructor() {
        if (new.target === BaseController) {
            throw new Error('BaseController不能实例化,只能继承使用。');
        }
    }

    /**
     * 初始化函数
     *
     * @param {object} request
     * @param {object} response
     * @param {function} next
     * @return {void}
     */
    init(request, response, next) {
        // 获取当前控制器和动作名称
        let urlInfo = Url.parse(request.originalUrl, true);
        let url = urlInfo.pathname.substr(1);
        let actionInfo = url.split('/');
        let controller = 'index';
        let action = 'index';
        switch (actionInfo.length) {
            case 1:
                controller = actionInfo[0];
                break;
            case 2:
                controller = actionInfo[0];
                action = actionInfo[1];
                break;
        }

        // 菜单数据
        response.locals.menu = menuData;
        // 二级菜单数据
        response.locals.secondMenu = menuData[controller] !== undefined && menuData[controller].children !== undefined ?
            menuData[controller].children : {};

        // url相关数据
        response.locals.urlQuery = JSON.stringify(urlInfo.query);
        response.locals.controller = controller;
        response.locals.action = action;

        // 用户session数据
        response.locals.manager = request.session.managerData;

        // moment工具
        response.locals.moment = Moment;

        next();
    }

    /**
     * 验证方法
     *
     * @param {object} request
     * @param {object} response
     * @param {function} next
     * @return {void}
     */
    auth(request, response, next) {
        // 判断session
        let mangerData = request.session.managerData;
        try {
            if (typeof mangerData !== 'object' || Object.keys(mangerData).length < 0) {
                throw 'err data';
            }

            if (mangerData.username === undefined || mangerData.loginTime === undefined) {
                throw 'username empty';
            }
            // 校验session
            let sessionToken = crypto.createHmac('sha1', mangerData.loginTime + '')
                .update(mangerData.username).digest().toString('base64');
            if (sessionToken !== mangerData.sessionToken) {
                throw 'session error';
            }

        } catch (error) {
            console.log(error);
            // 未登录
            response.redirect('/login');
        }

        next();
    }
}

export default BaseController;