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

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

var app = express();

app.all("*", function (req, res, next) {
	res.header("Access-Control-Allow-Origin", "*");
	//允许的header类型
	res.header("Access-Control-Allow-Headers", "content-type");
	//跨域允许的请求方式 
	res.header("Access-Control-Allow-Methods", "DELETE,PUT,POST,GET,OPTIONS");
	if (req.method == 'OPTIONS')
		res.sendStatus(200); //让options尝试请求快速结束
	else
		next();
});

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('/api/json/', indexRouter);
app.use('/api/json/', detailRouter);

app.use(function(req, res, next) {
  next(createError(404));
});

app.use(function(err, req, res, next) {
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};
  res.status(err.status || 500);
});

module.exports = app;