/**
 * yohobuy app
 * @author: xuqi<qi.xu@yoho.cn>
 * @date: 2016/4/25
 */
'use strict';

const config = require('./config/common');

// use one apm
if (config.useOneapm) {
    require('oneapm');
}

const express = require('express');
const path = require('path');
const bodyParser = require('body-parser');
const cookieParser = require('cookie-parser');
const favicon = require('serve-favicon');
const session = require('yoho-express-session');
const memcached = require('yoho-connect-memcached');
const uuid = require('uuid');
const _ = require('lodash');
const pkg = require('./package.json');
const sign = require('./library/sign');
const cookie = require('./library/cookie');

const app = express();
const MemcachedStore = memcached(session);


// 向模板注入变量
app.locals.devEnv = app.get('env') === 'development';
app.locals.version = pkg.version;

// 指定libray目录
global.library = path.resolve('./library/');

app.set('view engine', '.hbs');

app.use(favicon(path.join(__dirname, '/public/favicon.ico')));
app.use(express.static(path.join(__dirname, 'public')));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
    extended: false
}));
app.use(cookieParser());
app.use(session({
    proxy: true,
    resave: false,
    saveUninitialized: true,
    unset: 'destroy',
    secret: 'nothing', // 兼容 PHP SESSION，sessionID 不加密
    name: 'PHPSESSID', // 兼容 PHP SESSION
    genid: () => {
        return uuid.v4(); // 兼容 PHP SESSION
    },
    cookie: {
        domain: 'yohobuy.com'
    },
    store: new MemcachedStore({
        hosts: config.memcache.session,
        prefix: 'qinsessionsession:', // 兼容 PHP SESSION
        key: 'yohobuy_session' // 兼容 PHP SESSION
    })
}));

app.use((req, res, next) => {
    req.user = {};

    // 从 PHP 写的 SESSION 中获取到当前登录用户的 UID
    if (req.session && _.isNumber(req.session._LOGIN_UID)) {
        req.user.uid = req.session._LOGIN_UID;
    }

    // session 没有读取到的时候，从 cookie 读取 UID
    if (!req.user.uid && req.cookies._UID) {
        let uid = cookie.getUid(req);

        // 校验 cookie 的 uid 有没有被修改
        if (req.cookies._TOKEN === sign.makeToken(uid)) {
            req.user.uid = uid;
        }
    }

    next();
});

// dispatcher
require('./dispatch')(app);

// listener
app.listen(config.port, function() {
    console.log('yohobuy start');
});