import React from 'react';
import PropTypes from 'prop-types';
import 'onsenui/esm/elements/ons-icon';

import onsCustomElement from '../onsCustomElement';

const parseIcon = icon => {
  if (icon) {
    if ((typeof icon) === 'string') {
      return icon;
    } else {
      const keys = Object.keys(icon).filter((a) => a !== 'default');
      const innerString = keys.map((key) => key + ':' + icon[key] + '');
      return icon.default + ', ' + innerString.join(',');
    }
  }
};

const parseSize = size => {
  if (size) {
    if ((typeof size) === 'number') {
      return `${size}px`;
    } else {
      const keys = Object.keys(size).filter((a) => a !== 'default');
      const innerString = keys.map((key) => key + ':' + size[key] + 'px');
      return size.default + 'px, ' + innerString.join(',');
    }
  }
};

const Element = onsCustomElement('ons-icon');

/**
 * @original ons-icon
 * @category visual
 * @tutorial react/Reference/icon
 * @description
 * [en]
 * Displays an icon. The following icon suites are available:
 *   *  [Font Awesome](https://fortawesome.github.io/Font-Awesome/)
 *   *  [Ionicons](http://ionicons.com/)
 *   *  [Material Design Iconic Font](http://zavoloklom.github.io/material-design-iconic-font/)
 * [/en]
 * [ja][/ja]
 * @example
  <Icon
    size={{default: 32, material: 40}}
    icon={{default: 'ion-navicon', material: 'md-menu'}}
  />
*/
const Icon = React.forwardRef((props, ref) => {
  const {icon, size, ...rest} = props;

  return (
    <Element
      icon={parseIcon(icon)}
      size={parseSize(size)}
      {...rest}
      ref={ref}
    >
      {props.children}
    </Element>
  );
});

Icon.propTypes = {
  /**
   * @name modifier
   * @type string
   * @required false
   * @description
   *  [en]The appearance of the icon.[/en]
   *  [ja][/ja]
   */
  modifier: PropTypes.string,

  /**
   * @name icon
   * @type 'object or string'
   * @description
   *  [en] can be either a string or an object. If it is an string, it is set to an specific icon like 'ions-navicon'. If it is an object, it represents a dictionary of the icons depending on the modifier e.g.   `{{default: 'ion-navicon', material: 'md-menu'}}` [/en]
   *  [ja][/ja]
   */
  icon: PropTypes.oneOfType([
    PropTypes.string,
    PropTypes.objectOf(PropTypes.string)
  ]),

  /**
   * @name size
   * @type 'object or number'
   * @description
   *  [en] can be either a number or an object. If it is an number, it  specifies the icon size with a number in pixels. If it is an object, it represents a dictionary of the icon sizes depending on the modifier e.g.   `{{default: 20, material: 18}}` [/en]
   *  [ja][/ja]
   */
  size: PropTypes.oneOfType([
    PropTypes.number,
    PropTypes.objectOf(PropTypes.number)
  ]),

  /**
   * @name rotate
   * @type number
   * @description
   *  [en] Number of degrees to rotate the icon. Valid values are 90, 180 and 270. [/en]
   *  [ja][/ja]
   */
  rotate: PropTypes.oneOf([0, 90, 180, 270]),

  /**
   * @name fixedWidth
   * @type bool
   * @description
   * [en] When used in a list, you want the icons to have the same width so that they align vertically by defining this attribute. [/en]
   *  [ja][/ja]
   */
  fixedWidth: PropTypes.bool,

  /**
   * @name spin
   * @type bool
   * @description
   * [en] Specify whether the icon should be spinning. [/en]
   *  [ja][/ja]
   */
  spin: PropTypes.bool
};

export default Icon;