const Koa = require('koa')
const Router = require('koa-router');
const router = new Router();
const app = new Koa()
const views = require('koa-views')
const json = require('koa-json')
const onerror = require('koa-onerror')
const bodyparser = require('koa-bodyparser')
const logger = require('koa-logger')
const koaBody = require('koa-body');
const conn = require('./db/db')//链接数据库
const index = require('./routes/index')
const users = require('./routes/users')
//jwtoken
const jwt = require("jsonwebtoken")
//撒盐，加密时候混淆
const secret = '123bingjspoiuytrewqlkjhgfdsa'
// 放在路由中间前面
app.use(koaBody());
//生成token
//info也就是payload是需要存入token的信息
function createToken(info) {
    let token = jwt.sign(info, secret, {
        //Token有效时间 单位s
        expiresIn:60 * 60 * 10
    })
    return token
}
//验证Token
function verifyToken(token) {
    return new Promise((resolve, reject) => {
        jwt.verify(token, secret, (error, result) => {
            if(error){
                reject(error)
            } else {
                resolve(result)
            }
        })
    })
}

// error handler
onerror(app)

// middlewares
app.use(bodyparser({
  enableTypes:['json', 'form', 'text']
}))
app.use(json())
app.use(logger())
app.use(require('koa-static')(__dirname + '/public'))

app.use(views(__dirname + '/views', {
  extension: 'ejs'
}))

// logger
app.use(async (ctx, next) => {
  const start = new Date()
  await next()
  const ms = new Date() - start
  console.log(`${ctx.method} ${ctx.url} - ${ms}ms`)
})

//测试接口
router.get('/', ctx => {
  ctx.body = "Hello Koa !!!!"
})
// routes
app.use(router.routes()).use(router.allowedMethods());
app.use(index.routes(), index.allowedMethods())
app.use(users.routes(), users.allowedMethods())

// error-handling
app.on('error', (err, ctx) => {
  console.error('server error', err, ctx)
});

//设置允许跨域
// app.use(function(req, res, next) {
//   //指定允许其他域名访问 *所有
//   res.setHeader("Access-Control-Allow-Origin", "*");
//   // //允许客户端请求头中带有的
//   // res.setHeader("Access-Control-Allow-Headers", "Content-Type,Content-Length, Authorization, Accept,X-Requested-With");
//   // //允许请求的类型
//   // res.setHeader("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
//   // res.setHeader("X-Powered-By",' 3.2.1')
//   //让options请求快速返回
//   if(req.method=="OPTIONS") res.send(200);
//   else  next();
// });

app.listen(3000,()=>{
  console.log('正在监听3000端口');
})
module.exports = app