const fs = require('fs')
const path = require('path')
const Koa = require('koa')
const Router = require('koa-router')
const bodyParser = require('koa-bodyparser')
const LRU = require('lru-cache')
const WebSocket = require('ws')
const koaStatic = require('koa-static')

const routerOptions = {
  prefix: '/api'
}
const lruOptions = {
  max: 50,
  maxAge: 1000 * 60 * 60 * 24
}
const dataPath = './data/data.json'
const staticPath = './dist'

const router = new Router(routerOptions)
const cache = new LRU(lruOptions)

let STATIC_DATA = ''
fs.readFile(dataPath, (err, buf) => {
  if (err) {
    console.error(err)
    return
  }
  STATIC_DATA = buf.toString()
})

const app = new Koa()
const wss = new WebSocket.Server({ port: 5556 })

app.use(koaStatic(path.join(__dirname, staticPath)))

wss.on('connection', ws => {
  ws.on('message', msg => {
    const res = JSON.parse(msg)
    console.log('msg: ', res)
    if (res.code && res.status === 'update') {
      const list = cache.get(res.code)
      const data = JSON.stringify({ data: list })
      wss.clients.forEach(client => {
        if (client.readyState === WebSocket.OPEN) {
          client.send(data)
        }
      })
    }
  })
})

app.use(bodyParser())

// 判断是不是api
// app.use((ctx, next) => {
//   const url = ctx.url
//   const isApi = /^\/api/.test(url)
//   ctx.$isApi = isApi
//   next()
// })

router.get('/list', (ctx, next) => {
  const { code } = ctx.query
  let data
  if (cache.has(code)) {
    data = cache.get(code)
  } else {
    const jsonData = JSON.parse(STATIC_DATA).data || []
    const len = 25
    const sum = jsonData.length - len
    const arr = new Array(25).fill(1).map(el => Math.floor(Math.random() * sum))
    const groupList = [1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 3, 0, 0, 0, 0, 0, 0, 0]
    data = new Array(25).fill(1).map((el, i) => {
      const del = groupList.length ? Math.floor(Math.random() * groupList.length) : 0
      const group = groupList.splice(del, 1)[0]
      return {
        text: jsonData.splice(arr[i], 1)[0],
        status: 0,
        group
      }
    })
    cache.set(code, data)
  }

  ctx.body = {
    code,
    data
  }
})

router.put('/status/:code', ctx => {
  const { params, request } = ctx
  const { code } = params
  const { index } = request.body
  const list = cache.get(code) || []
  if (!index) {
    throw new Error('index is not find')
  }
  if (!list || !list.length) {
    throw new Error('cache list is not find')
  }
  list[index].status = list[index].status ? 0 : 1
  cache.set(code, list)
  ctx.body = { success: true, msg: '更新成功', data: list[index] }
})

app.use(router.routes()).use(router.allowedMethods())

app.on('error', err => console.error(err))

app.listen(5555)

console.log('http://127.0.0.1:5555')