var crypto = require('crypto');

function Cache() {
  this._store = {};
}

Cache.prototype.get = function(key) {
  key = this._serialize(key);
  return key in this._store ? this._store[key] : undefined;
};

Cache.prototype.set = function(key, value) {
  key = this._serialize(key);
  this._store[key] = value;
  return this;
};

Cache.prototype._serialize = function(mixedKey) {
  var json = JSON.stringify(mixedKey);
  return this._hash(json);
};

Cache.prototype._hash = function(str) {
  var shasum = crypto.createHash('md5');
  shasum.update(str);
  return shasum.digest('hex');
};

module.exports = Cache;