'use strict'

/**
 * Module dependencies
 */

const express = require('express')
const fs = require('fs')
const path = require('path')
const cors = require('cors')

/**
 * To test, publish something on 'test-express' channel
 *
 * $ redis-cli publish test-express testmessage
 */


// stream

const subscribe = require('redis-subscribe-sse')


// express app

let app = express()
app.use(cors())


let sse = subscribe({
    channels: 'qrcode',
    retry: 5000,
    host: '127.0.0.1',
    port: 6379
})

let latestMessage = null

sse.addListener("data", (data) => {
    // console.log(data.toString().substring(6));
    latestMessage = JSON.parse(data.toString().substring(6))
})

app.get('/', (req, res) => {
    let index = path.join(__dirname, './index.html')
    fs.createReadStream(index).pipe(res)
})


app.get("/qrcode", (req, res) => {
    res.json(latestMessage)
    // res.send("hello")
})

app.get('/qrcode-sse', (req, res) => {
    req.socket.setTimeout(Number.MAX_VALUE)
    res.set({
        'Content-Type': 'text/event-stream',
        'Cache-Control': 'no-cache',
        'Connection': 'keep-alive'
    })

    sse.pipe(res)
})

app.listen(3000, () => {
    console.log('Express listening on port 3000')
})