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

if (process.env.USE_APM === '1' && process.env.NODE_ENV === 'production') {
    require('oneapm');
}

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

global.Promise = require('bluebird');

const yohoLib = require('yoho-node-lib');

// 全局注册library
yohoLib.global(config);

const express = require('express');
const compression = require('compression');
const path = require('path');
const bodyParser = require('body-parser');
const cookieParser = require('cookie-parser');
const favicon = require('serve-favicon');
const _ = require('lodash');
const fp = require('lodash/fp');

const CookieSession = require('client-sessions');
const MemcachedSession = require('yoho-express-session');
const memcached = require('connect-memcached');
const MemcachedStore = memcached(MemcachedSession);
const pkg = require('./package.json');
const app = express();
const helpers = global.yoho.helpers;

// NOTE: 这里修改了图片质量的参数
helpers.image = _.flow(helpers.image, fp.replace(/\/quality\/\d*$/, '/quality/90'));

// NOTE：这里修改了参数的个数
helpers.getUrlBySkc = pid => `//item.yohobuy.com/p${pid}.html`;

global.middleware = path.resolve('./doraemon/middleware');
global.utils = path.resolve('./utils');
global.appRoot = path.resolve(__dirname);

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

// zookeeper
if (config.zookeeperServer) {
    require('yoho-zookeeper')(config.zookeeperServer, 'pc', app.locals.pc = {}, global.yoho.cache);
}

app.enable('trust proxy');

// 请求限制中间件
app.use(require('./doraemon/middleware/limiter'));

app.set('subdomain offset', 2);
app.use(global.yoho.hbs({
    extname: '.hbs',
    defaultLayout: 'layout',
    layoutsDir: path.join(__dirname, 'doraemon/views'),
    partialsDir: path.join(__dirname, 'doraemon/views/partial'),
    views: path.join(__dirname, 'doraemon/views'),
    helpers: Object.assign(global.yoho.helpers, require('./utils/helpers'))
}));

app.use(global.yoho.middleware());

app.use(favicon(path.join(__dirname, '/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(compression());

app.use(MemcachedSession({  // eslint-disable-line
    proxy: true,
    resave: false,
    saveUninitialized: true,
    unset: 'destroy',
    secret: '82dd7e724f2c6870472c89dfa43cf48d',
    name: 'yohobuy_session',
    cookie: {
        domain: 'yohobuy.com',
        httpOnly: false
    },
    store: new MemcachedStore({
        hosts: config.memcache.session,
        prefix: 'yohobuy_session:',
        reconnect: 5000,
        timeout: 1000,
        retries: 0
    })
}));

app.use(CookieSession({ // eslint-disable-line
    requestKey: 'session2',
    cookieName: 'yohobuy_session_cookie',
    secret: '82dd7e724f2c6870472c89dfa43cf48d',
    domain: config.cookieDomain
}));

app.use((req, res, next) => {
    if (req.session) {
        let sessionKeys = Object.keys(req.session || {});
        let backSessionKeys = Object.keys(req.session2.sessionBack || {});

        if (backSessionKeys.length > sessionKeys.length) {
            let differences = _.difference(backSessionKeys, sessionKeys);

            _.forEach(differences, d => {
                req.session[d] = req.session2.sessionBack[d];
            });
        }
        req.session2.sessionBack = req.session;
    } else {
        req.session = new MemcachedSession.Session(req);
        req.session.cookie = new MemcachedSession.Cookie({
            domain: 'yohobuy.com',
            httpOnly: false
        });
        req.session = _.assign(req.session, req.session2.sessionBack);
    }

    if (typeof req.session.reset !== 'function') {
        req.session.reset = function() {
            req.session = null;
            req.session2.reset();
        };
    }
    next();
});

app.use((req, res, next) => {
    req.user = {}; // 全局的用户数据
    req.yoho = {}; // req和res绑定yoho对象，用于传递全局数据, 如req.yoho.channel等

    if (!req.session) {
        req.session = {};
    }

    next();
});

const logger = global.yoho.logger;

// dispatcher
try {
    const subDomain = require('./doraemon/middleware/sub-domain');
    const mobileRefer = require('./doraemon/middleware/mobile-refer');
    const mobileCheck = require('./doraemon/middleware/mobile-check');
    const user = require('./doraemon/middleware/user');
    const seo = require('./doraemon/middleware/seo');
    const setYohoData = require('./doraemon/middleware/set-yoho-data');
    const errorHanlder = require('./doraemon/middleware/error-handler');
    const setPageInfo = require('./doraemon/middleware/set-pageinfo');
    const layoutTools = require('./doraemon/middleware/layout-tools');
    const pageCache = require('./doraemon/middleware/page-cache');
    const devtool = require('./doraemon/middleware/devtools');

    // YOHO 前置中间件
    app.use(subDomain());
    app.use(mobileRefer());
    app.use(mobileCheck());
    app.use(setYohoData());
    app.use(user());
    app.use(seo());
    app.use(setPageInfo());
    app.use(layoutTools());
    app.use(pageCache());

    if (app.locals.devEnv) {
        app.use(devtool());
    }

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

    app.all('*', errorHanlder.notFound()); // 404

    // YOHO 后置中间件
    app.use(errorHanlder.serverError());
} catch (err) {
    logger.error(err);
}

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