'use strict';

var _trader;
var _lamassuConfig;
var logger = require('./logger');

module.exports = {
  init: init,
  getFingerprint: getFingerprint
};

// 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;
};

function poll(req, res) {
  var rateRec = _trader.rate();
  var balanceRec = _trader.balance;
  var fingerprint = getFingerprint(req);

  logger.debug('poll request from: %s', fingerprint);

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

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

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

  var rate = rateRec.rate;
  if (rate === null) return res.json({err: 'No rate available'});
  var fiatBalance = _trader.fiatBalance(fingerprint);
  if (fiatBalance === null) return res.json({err: 'No balance available'});

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

function trade(req, res) {
  var fingerprint = getFingerprint(req);
  _trader.trade(req.body, fingerprint);
  res.json({err: null});
};

function send(req, res) {
  var fingerprint = getFingerprint(req);
  _trader.sendBitcoins(fingerprint, req.body, function(err, txHash) {
    res.json({
      err: err && err.message,
      txHash: txHash,
      errType: err && err.name
    });
  });
};

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

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

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

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

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

  return app;
};

function getFingerprint(req) {
  return typeof req.connection.getPeerCertificate === 'function' &&
    req.connection.getPeerCertificate().fingerprint;
};