/**
 * 应用入口
 * @author xuqi<qi.xu@yoho.cn>
 * @date: 2016/3/28
 */

var express = require('express'),
    path = require('path'),
    exphbs = require('express-handlebars'),
    bodyParser = require('body-parser');

var logger = require('morgan'),
    favicon = require('serve-favicon'),
    cookieParser = require('cookie-parser'),
    session = require('express-session'),
    connectRedis = require('connect-redis');

var app = express(),
    RedisStore = connectRedis(session);

var config = require('./config');

// 根据不同环境获取不同配置
if (app.get('env') === 'development') {
    config = Object.assign(config, require('./config/config.dev'));
}

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

app.set('trust proxy', ['loopback', 'linklocal', 'uniquelocal']);
app.set('views', path.join(__dirname, 'views/action'));

app.engine('.hbs', exphbs({
    extname: '.hbs',
    defaultLayout: 'main',
    layoutsDir: 'views/layouts/',
    partialsDir: 'views/partials/',
    helpers: 'helpers'
}));
app.set('view engine', '.hbs');

app.use(favicon(path.join(__dirname, '/public/favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

// session 配置
app.use(session({
    name: config.sessionName,
    resave: true,
    saveUninitialized: true,
    httpOnly: true,
    store: new RedisStore(config.sessionRedis),
    secret: config.sessionSecret
}));

// 加载路由
app.use('/', require('./router'));

// 未知路由转入 404
app.use(function(req, res) {
    var err = new Error('Not Found');

    err.status = 404;
    res.status(404).send(err);
});

// 捕获全局错误, 开发环境返回错误详情
app.use(function(err, req, res) {
    if (app.locals.devEnv) {
        console.log(err);
    } else {
        err = {};
    }

    res.status(err.status || 500);
    res.render('error', {
        message: err.message,
        error: err
    });
});

module.exports = app;