var Hmac = require('./browserHmac');
var Md5 = require('./browserMd5');
var Sha1 = require('./browserSha1');
var Sha256 = require('./browserSha256');

/**
 * @api private
 */
module.exports = exports = {
    createHash: function createHash(alg) {
      alg = alg.toLowerCase();
      if (alg === 'md5') {
        return new Md5();
      } else if (alg === 'sha256') {
        return new Sha256();
      } else if (alg === 'sha1') {
        return new Sha1();
      }

      throw new Error('Hash algorithm ' + alg + ' is not supported in the browser SDK');
    },
    createHmac: function createHmac(alg, key) {
      alg = alg.toLowerCase();
      if (alg === 'md5') {
        return new Hmac(Md5, key);
      } else if (alg === 'sha256') {
        return new Hmac(Sha256, key);
      } else if (alg === 'sha1') {
        return new Hmac(Sha1, key);
      }

      throw new Error('HMAC algorithm ' + alg + ' is not supported in the browser SDK');
    },
    createSign: function() {
      throw new Error('createSign is not implemented in the browser');
    }
  };