var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var cors = require('cors');

var indexRouter = require('./routes/index');

var app = express();

// 导入env
require("dotenv").config();
// 使用evn文件保存的mongodb username和password
const dbUsername = process.env.DB_USERNAME;
const dbPassword = process.env.DB_PASSWORD;

// mongoose连接mongodb
const mongoose = require("mongoose");
const mongoDBUrl = `mongodb://${dbUsername}:${dbPassword}@47.106.93.245:27017/customapi?authSource=admin`;
mongoose.connect(mongoDBUrl);
const db = mongoose.connection;
db.on("connected", () => console.log("MongoDB 连接成功"));
db.on("error", err => console.error(err, "\nMongoDB 连接错误"));
db.on("close", () => console.log("\nMongoDB 连接关闭"));

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

app.use(cors());
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('/', 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;