var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
const mongoose = require('mongoose')
const session = require('express-session')
const MongoStore = require('connect-mongo')

var indexRouter = require('./routes/index');
const userRouter = require('./routes/users');
const AccountRouter = require('./routes/api/account')

var app = express();

const mongodbUrl = 'mongodb://127.0.0.1:27017/student'

mongoose.connect(mongodbUrl)
mongoose.connection.once('open',()=>{
  console.log('连接成功..');

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

  app.use(logger('dev'));
  app.use(express.json());
  app.use(express.urlencoded({ extended: false }));
  app.use(cookieParser());
  app.use(express.static(path.join(__dirname, 'public')));
  app.use(session({
    name: 'sid', //设置cookie的name，默认connect.si
    secret: 'lsx',//加密字符串，盐
    saveUninitialized: false, //是否每次请求都设置一个cookie存储session
    resave: true, //每次请求重新保存session  20分钟
    store: MongoStore.create({
      mongoUrl: mongodbUrl  //session存储在数据库中
    }),
    cookie: {
      httpOnly: true, //开启后前端无法通过JS操作
      maxAge: 1000 * 60 * 5 //5分钟缓存
    },
  }))

  //web响应
  app.use('/', indexRouter);
  app.use('/user',userRouter);
  //api响应
  app.use('/api',AccountRouter);

  // 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;