import {withState} from 'incompose';
import withState from 'incompose/dist/withState';

import {
  linkEvent
} from 'inferno';

import {
  compose,
  withState,
  shouldUpdate
} from 'incompose';

const inc = (props) => {
  props.setCount(props.count += 1);
};

const dec = (props) => {
  props.setCount(props.count -= 1);
};

const Counter = (props) => (
  <div>
    <h1>count : {props.count}</h1>
    <button onClick={linkEvent(props, dec)}>-</button>
    <button onClick={linkEvent(props, inc)}>+</button>
  </div>
);

/**
 * with state creates 2 new props on the component props
 * props.count		-	contains the value (1 is set as default value)
 * props.setCount	-	contains the setter function
 */
const withCounterState = withState('count', 'setCount', 1);

/**
 * should update prevents the component of re-render (shouldUpdate lifecycle hook)
 * you can compare current and next props and decide whether the component
 * should update or not. In this example, the counter just updates if
 * props.count is even.
 */
const withUpdatePolicy = shouldUpdate((props, nextProps) => (
  nextProps.count % 2 === 0
));

/**
 * with compose all the extended functions are composed BEFORE Counter
 * gets rendered. Please not that order matters.
 */
export default compose(
  withCounterState,
  withUpdatePolicy,
)(Counter);