var createError = require('http-errors');
var express = require('express');
var path = require('path');
const session = require('express-session');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var ejs = require('ejs');
var indexRouter = require('./routes/index');
var app = express();
import config from './config/settings'
app.use(cookieParser(config.session_secret));
  let  sessionConfig = {
        secret: config.encrypt_key,
        cookie: {
            maxAge: 1000 * 60 * 60
        },
        resave: false,
        saveUninitialized: true,
        rolling:true/*只要页面在操作就不会过期，无操作1小时后过期*/
}


app.use(session(sessionConfig));
app.use(function (req, res, next) {
    res.header('Access-Control-Allow-Origin', '*'); //这个表示任意域名都可以访问，这样写不能携带cookie了。
//res.header('Access-Control-Allow-Origin', 'http://www.baidu.com'); //这样写，只有www.baidu.com 可以访问。
    res.header('Access-Control-Allow-Headers', 'Content-Type, Content-Length, Authorization,token');
    res.header('Access-Control-Allow-Methods', 'PUT, POST, GET, DELETE, OPTIONS');//设置方法
    res.header('Content-Type', 'application/json;charset=utf-8');
    if (req.method == 'OPTIONS') {
        res.send(200); // 意思是，在正常的请求之前，会发送一个验证，是否可以请求。
    }
    else {
        next();
    }
});


// view engine setup
app.set('views', path.join(__dirname, 'views'));
// app.set('view engine', 'jade');
app.engine('html', ejs.__express);
app.set('view engine', 'html');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({extended: false}));

app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);

// catch 404 and forward to error handler
app.use(function (req, res, next) {
    next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
    // set locals, only providing error in development
    res.locals.message = err.message;
    res.locals.error = req.app.get('env') === 'development' ? err : {};

    // render the error page
    res.status(err.status || 500);
    res.render('error');
});

module.exports = app;