fetch = require('node-fetch')
cron = require('node-cron')
express = require('express')
bodyParser = require('body-parser')


userObj= 

gameObj = {
    users: {
        Agne: {
            USD:1000,
            BTC:0
        },
        Dan: {
            USD:1000,
            BTC:0
        }
    },
    bid: 0,
    ask: 0,
    price: 0 
}


cron.schedule('* * * * * *', () => {
  updateGame()
})


async function updateGame(){
    const response = await fetch('https://www.bitstamp.net/api/ticker/')
    const json = await response.json()
    gameObj.ask = json.ask
    gameObj.bid = json.bid
    gameObj.price = json.last

}

function trade(userID,asset){
    returnObj = {message: "Something is wrong or someone was lazy"}
    switch (asset) {
        case "USD":
            if (gameObj.users[userID].USD != 0){
                gameObj.users[userID].BTC=(gameObj.users[userID].USD/gameObj.ask)
                returnObj.message = "Bought "+gameObj.users[userID].BTC+" BTC for "+gameObj.users[userID].USD+" USD at "+gameObj.ask
                gameObj.users[userID].USD=0
                return returnObj
            } else {
                returnObj.message = "You don't have any of that asset"
                return returnObj
            }
        case "BTC":
            if (gameObj.users[userID].BTC != 0){
                gameObj.users[userID].USD=(gameObj.bid*gameObj.users[userID].BTC)
                returnObj.message = "Bought "+gameObj.users[userID].USD+" USD for "+gameObj.users[userID].BTC+" BTC at "+gameObj.bid
                gameObj.users[userID].BTC=0
                return returnObj
            } else {
                returnObj.message = "You don't have any of that asset"
                return returnObj
            }
        default:
            returnObj.message = "Something went bad wrong"
            break;
    }

}


const app = express()

app.use(bodyParser.json(),function (req, res, next) {
    res.setHeader('Access-Control-Allow-Origin', '*')
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST')
    res.setHeader('Access-Control-Allow-Headers', 'Content-Type')
    res.setHeader('Content-Type', 'application/json')
    res.setHeader('Access-Control-Allow-Credentials', true)
    next()
})

app.post('/submit', async function (req, res) {
    res.send(trade(req.body.userID,req.body.asset))
})

app.get('/status', function (req,res){
    res.send(JSON.stringify(gameObj))
})

app.listen(5000)