var mschema = require('mschema');

/**
 * OKSchema!
 * Meant as a thin wrapper around some existing schema validation
 * module, mostly to allow for the extension of types.
 */
function OKSchema(spec) {
  if (!(this instanceof OKSchema)) return new OKSchema(spec);
  if (!spec)
    throw new Error('No spec provided to OKSchema');
  Object.defineProperty(this, 'spec', {
    value: spec,
    writable: false
  });
}

OKSchema.prototype.assertValid = function(data) {
  var result = mschema.validate(data, this.toMschema());
  if (!result.valid)
    throw result.errors;
};

/**
 * Return schema as an mschema object.
 * Currently no difference between the two.
 */
OKSchema.prototype.toMschema = function() {
  return this.spec;
};

module.exports = OKSchema;