var codes = require('./codes.json');

module.exports = status;

// [Integer...]
status.codes = Object.keys(codes).map(function (code) {
  code = ~~code;
  var msg = codes[code];
  status[code] = msg;
  status[msg] = status[msg.toLowerCase()] = code;
  return code;
});

// status codes for redirects
status.redirect = {
  300: true,
  301: true,
  302: true,
  303: true,
  305: true,
  307: true,
  308: true,
};

// status codes for empty bodies
status.empty = {
  204: true,
  205: true,
  304: true,
};

// status codes for when you should retry the request
status.retry = {
  502: true,
  503: true,
  504: true,
};

function status(code) {
  if (typeof code === 'number') {
    if (!status[code]) throw new Error('invalid status code: ' + code);
    return code;
  }

  if (typeof code !== 'string') {
    throw new TypeError('code must be a number or string');
  }

  // '403'
  var n = parseInt(code, 10)
  if (!isNaN(n)) {
    if (!status[n]) throw new Error('invalid status code: ' + n);
    return n;
  }

  n = status[code.toLowerCase()];
  if (!n) throw new Error('invalid status message: "' + code + '"');
  return n;
}