'use strict';

var _trader;
var _lamassuConfig;

// Make sure these are higher than polling interval
// or there will be a lot of errors
var STALE_TICKER  = 180000;
var STALE_BALANCE = 180000;

Error.prototype.toJSON = function () {
  var self = this;
  var ret = {};
  Object.getOwnPropertyNames(self).forEach(function (key) {
    ret[key] = self[key];
  });
  return ret;
};

var poll = function(req, res) {
  var rateRec = _trader.rate(req.params.currency);
  var satoshiBalanceRec = _trader.balance;

  // `rateRec` and `satoshiBalanceRec` are both objects, so there's no danger
  // of misinterpreting rate or balance === 0 as 'Server initializing'.
  if (!rateRec || !satoshiBalanceRec) {
    return res.json({err: 'Server initializing'});
  }

  if (Date.now() - rateRec.timestamp > STALE_TICKER) {
    return res.json({err: 'Stale ticker'});
  }

  if (Date.now() - rateRec.timestamp > STALE_BALANCE) {
    return res.json({err: 'Stale balance'});
  }

  var rate = rateRec.rate;

  res.json({
    err: null,
    rate: rate * _trader.config.exchanges.settings.commission,
    fiat: _trader.fiatBalance(0, 0),
    currency: req.params.currency,
    txLimit: parseInt(_trader.config.exchanges.settings.compliance.maximum.limit, 10)
  });
};

var trade = function (req, res) {
  _trader.trade(req.body.fiat, req.body.satoshis, req.body.currency, function(err) {
    res.json({err: err});
  });
};

var send = function(req, res) {
  var fingerprint = req.connection.getPeerCertificate().fingerprint;
  _trader.sendBitcoins(fingerprint, req.body, function(err, txHash) {
    res.json({err: err, txHash: txHash});
  });
};

var pair = function(req, res) {
  var token = req.body.token;
  var name = req.body.name;

  _lamassuConfig.pair(
    token,
    req.connection.getPeerCertificate().fingerprint,
    name,
    function(err) {
      if (err) {
        return res.json(500, { err: err.message });
      }

      res.json(200);
    }
  );
};

exports.init = function(app, config, trader, authMiddleware) {
  _lamassuConfig = config;
  _trader = trader;

  app.get('/poll/:currency', authMiddleware, poll);
  app.post('/send', authMiddleware, send);
  app.post('/trade', authMiddleware, trade);
  app.post('/pair', pair);

  return app;
};