handleSubmit = (event) => {
    event.preventDefault();
    const form = this.state.signInForm.fields;
    const params = {
      email: form.email.value,
      password: form.password.value,
    };
    this.props.onSignIn(params);
  }

/**
 * Mapping dispatched functions to component's properties
 * @param  {Object} dispatch Application dispatch function
 * @return {Object} Mapped functions
 */
const mapDispatchToProps = dispatch => ({
  onSignIn: user => dispatch(signIn(user)),
});

/**
 * Mapping application state to component's properties
 * @param  {Object} state Application state
 * @return {Object} Mapped properties
 */
const mapStateToProps = state => ({
  signInErrors: state.authorization.signInErrors,
});

export default connect(mapStateToProps, mapDispatchToProps)(SignIn);