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

//优先读取环境变量
require("dotenv").config();

//引入数据库连接
require("./dao/db");

//引入路由
const userRouter = require("./routes/user");
const expressRouter = require("./routes/express");
const addressRouter = require("./routes/address");

var app = express();

//配置cors
const corsOptions = {
  allowedHeaders: ["Content-Type", "Authorization"],
  exposedHeaders: ["Authentication", "X-Custom-Header"],
  credentials: true,
};
//为所有源跨域
app.use(cors(corsOptions));
//使用各种中间件
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")));

//使用路由中间件
app.use("/user", userRouter);
app.use("/express", expressRouter);
app.use("/address", addressRouter);

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

// 错误捕获
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);
});

module.exports = app;