text: import React from 'react';
  import PropTypes from 'prop-types';
  import clsx from 'clsx';
  import SwitchBase from '../internal/SwitchBase';
  import RadioButtonIcon from './RadioButtonIcon';
  import { fade } from '../styles/colorManipulator';
  import { capitalize, createChainedFunction } from '../utils/helpers';
  import withStyles from '../styles/withStyles';
  import RadioGroupContext from '../RadioGroup/RadioGroupContext';
  
  export const styles = theme => ({
    /* Styles applied to the root element. */
    root: {
      color: theme.palette.text.secondary,
    },
    /* Pseudo-class applied to the root element if `checked={true}`. */
    checked: {},
    /* Pseudo-class applied to the root element if `disabled={true}`. */
    disabled: {},
    /* Styles applied to the root element if `color="primary"`. */
    colorPrimary: {
      '&$checked': {
        color: theme.palette.primary.main,
        '&:hover': {
          backgroundColor: fade(theme.palette.primary.main, theme.palette.action.hoverOpacity),
          // Reset on touch devices, it doesn't add specificity
          '@media (hover: none)': {
            backgroundColor: 'transparent',
          },
        },
      },
      '&$disabled': {
        color: theme.palette.action.disabled,
      },
    },
    /* Styles applied to the root element if `color="secondary"`. */
    colorSecondary: {
      '&$checked': {
        color: theme.palette.secondary.main,
        '&:hover': {
          backgroundColor: fade(theme.palette.secondary.main, theme.palette.action.hoverOpacity),
          // Reset on touch devices, it doesn't add specificity
          '@media (hover: none)': {
            backgroundColor: 'transparent',
          },
        },
      },
      '&$disabled': {
        color: theme.palette.action.disabled,
      },
    },
  });
  
  const defaultCheckedIcon = <RadioButtonIcon checked />;
  const defaultIcon = <RadioButtonIcon />;
  
  const Radio = React.forwardRef(function Radio(props, ref) {
    const {
      checked: checkedProp,
      classes,
      color = 'secondary',
      name: nameProp,
      onChange: onChangeProp,
      ...other
    } = props;
    const radioGroup = React.useContext(RadioGroupContext);
  
    let checked = checkedProp;
    const onChange = createChainedFunction(onChangeProp, radioGroup && radioGroup.onChange);
    let name = nameProp;
  
    if (radioGroup) {
      if (typeof checked === 'undefined') {
        checked = radioGroup.value === props.value;
      }
      if (typeof name === 'undefined') {
        name = radioGroup.name;
      }
    }
  
    return (
      <SwitchBase
        color={color}
        type="radio"
        icon={defaultIcon}
        checkedIcon={defaultCheckedIcon}
        classes={{
          root: clsx(classes.root, classes[`color${capitalize(color)}`]),
          checked: classes.checked,
          disabled: classes.disabled,
        }}
        name={name}
        checked={checked}
        onChange={onChange}
        ref={ref}
        {...other}
      />
    );
  });
  
  Radio.propTypes = {
    /**
     * If `true`, the component is checked.
     */
    checked: PropTypes.bool,
    /**
     * The icon to display when the component is checked.
     */
    checkedIcon: PropTypes.node,
    /**
     * Override or extend the styles applied to the component.
     * See [CSS API](#css) below for more details.
     */
    classes: PropTypes.object.isRequired,
    /**
     * The color of the component. It supports those theme colors that make sense for this component.
     */
    color: PropTypes.oneOf(['primary', 'secondary', 'default']),
    /**
     * If `true`, the switch will be disabled.
     */
    disabled: PropTypes.bool,
    /**
     * If `true`, the ripple effect will be disabled.
     */
    disableRipple: PropTypes.bool,
    /**
     * The icon to display when the component is unchecked.
     */
    icon: PropTypes.node,
    /**
     * The id of the `input` element.
     */
    id: PropTypes.string,
    /**
     * [Attributes](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#Attributes) applied to the `input` element.
     */
    inputProps: PropTypes.object,
    /**
     * This property can be used to pass a ref callback to the `input` element.
     */
    inputRef: PropTypes.oneOfType([PropTypes.func, PropTypes.object]),
    /**
     * Name attribute of the `input` element.
     */
    name: PropTypes.string,
    /**
     * Callback fired when the state is changed.
     *
     * @param {object} event The event source of the callback.
     * You can pull out the new value by accessing `event.target.value`.
     * @param {boolean} checked The `checked` value of the switch
     */
    onChange: PropTypes.func,
    /**
     * The input component property `type`.
     */
    type: PropTypes.string,
    /**
     * The value of the component.
     */
    value: PropTypes.any,
  };
  
  export default withStyles(styles, { name: 'MuiRadio' })(Radio);
  