const https = require("https");

const api_url = ({ market, crypto, currency }) => `https://api.cryptowat.ch/markets/${market}/${crypto}${currency}/summary`;
const currencies = {
  usd: ({ val }) => `\$${val}`,
  eur: ({ val }) => `${val}€`,
  eth: ({ val }) => `${val}Ξ`,
  btc: ({ val }) => `${val}฿`,
  xmr: ({ val }) => `${val} xmr`
};
const markets = {
  btc: "coinbase",
  eth: "coinbase",
  xmr: "bitfinex"
};

module.exports = bot => {
  bot._trigger.set("coins", {
    call: /^(\.|\/)(btc|eth|xmr)/i,
    level: 0,
    active: true,
    clients: ["irc", "tg"],
    f: e => {
      let args = e.message.trim().substr(1).toLowerCase().split(" ");
      cryptowat_summary(args[0], markets[args[0]], args[0] !== "xmr" ? args[1] : "usd").then(
        resolve => e.reply(resolve),
        reject => e.reply(reject)
      );
    }
  });
};

const cryptowat_summary = (crypto, market, currency) => {
  return new Promise((resolve, reject) => {
    if (!currency)
      currency = "eur";
    if (!Object.keys(currencies).includes(currency) || crypto === currency)
      reject(`Can't convert or invalid currency: ${currency}`);
    https.get([{ market: market, crypto: crypto, currency: currency }].map(api_url).join``, res => {
      let content = "";
      res.on('data', chunk => content += chunk.toString());
      res.on('end', () => {
        if(content.length === 0)
          reject("No data received");
        const result = JSON.parse(content).result;
        const data = {
          last: [{ val: result.price.last }].map(currencies[currency]).join``,
          high: [{ val: result.price.high }].map(currencies[currency]).join``,
          low: [{ val: result.price.low }].map(currencies[currency]).join``,
          change: (result.price.change.percentage * 100).toFixed(2),
          volume: result.volume
        };

        resolve(`Current: [b]${data.last}[/b] - High: [b]${data.high}[/b] - Low: [b]${data.low}[/b] - Change: [b]${data.change}[/b]% - Volume: [b]${data.volume}[/b]`);
      });
    });
  });
};