import React, { useState, useEffect } from 'react';
import PropTypes from 'prop-types';
import classNames from 'classnames';

function CheckedIcon() {
  return <>🌜</>;
}
function UncheckedIcon() {
  return <>🌞</>;
}

function ToggleButton(props) {
  const [toggle, setToggle] = useState(false);
  const {
    defaultChecked, onChange, disabled, className,
  } = props;

  useEffect(() => {
    if (defaultChecked) {
      setToggle(defaultChecked);
    }
  }, [defaultChecked]);

  const triggerToggle = () => {
    if (disabled) {
      return;
    }

    setToggle(!toggle);

    if (typeof onChange === 'function') {
      onChange(!toggle);
    }
  };

  const getIcon = (type) => {
    const { icons } = props;
    if (!icons) {
      return null;
    }

    return icons[type] === undefined
      ? ToggleButton.defaultProps.icons[type]
      : icons[type];
  };

  const toggleClasses = classNames('wrg-toggle', {
    'wrg-toggle--checked': toggle,
    'wrg-toggle--disabled': disabled,
  }, className);

  return (
    <div onClick={triggerToggle} className={toggleClasses}>
      <div className="wrg-toggle-container">
        <div className="wrg-toggle-check">
          <span>{ getIcon('checked') }</span>
        </div>
        <div className="wrg-toggle-uncheck">
          <span>{ getIcon('unchecked') }</span>
        </div>
      </div>
      <div className="wrg-toggle-circle" />
      <input type="checkbox" aria-label="Toggle Button" className="wrg-toggle-input" />
    </div>
  );
}

ToggleButton.defaultProps = {
  icons: {
    checked: <CheckedIcon />,
    unchecked: <UncheckedIcon />,
  },
};

ToggleButton.propTypes = {
  disabled: PropTypes.bool,
  defaultChecked: PropTypes.bool,
  className: PropTypes.string,
  onChange: PropTypes.func,
  icons: PropTypes.oneOfType([
    PropTypes.bool,
    PropTypes.shape({
      checked: PropTypes.node,
      unchecked: PropTypes.node,
    }),
  ]),
};

export default ToggleButton;
