// @flow

import React from 'react';
import type { Node, ElementType } from 'react';
import classNames from 'classnames';
import Typography from '../Typography';
import withStyles from '../styles/withStyles';

export const styles = (theme: Object) => ({
  root: {
    'label + div > &': {
      marginTop: -theme.spacing.unit * 2,
      height: 26,
    },
  },
  positionStart: {
    marginRight: theme.spacing.unit,
  },
  positionEnd: {
    marginLeft: theme.spacing.unit,
  },
});

type ProvidedProps = {
  classes: Object,
  /**
   * @ignore
   */
  theme?: Object,
};

export type Props = {
  /**
   * The content of the component, normally an `IconButton` or string.
   */
  children?: Node,
  /**
   * Useful to extend the style applied to components.
   */
  classes?: Object,
  /**
   * @ignore
   */
  className?: string,
  /**
   * The component used for the root node.
   * Either a string to use a DOM element or a component.
   */
  component: ElementType,
  /**
   * If children is a string then disable wrapping in a Typography component.
   */
  disableTypography: boolean,
  /**
   * The position this adornment should appear relative to the `Input`.
   */
  position: 'start' | 'end',
};

class InputAdornment extends React.Component<ProvidedProps & Props> {
  static defaultProps = {
    component: ('div': ElementType),
    disableTypography: false,
  };

  render() {
    const {
      children,
      component: Component,
      classes,
      className,
      disableTypography,
      position,
      ...other
    } = this.props;

    return (
      <Component
        className={classNames(
          classes.root,
          {
            [classes.positionStart]: position === 'start',
            [classes.positionEnd]: position === 'end',
          },
          className,
        )}
        {...other}
      >
        {typeof children === 'string' && !disableTypography ? (
          <Typography color="secondary">{children}</Typography>
        ) : (
          children
        )}
      </Component>
    );
  }
}

export default withStyles(styles, { name: 'MuiInputAdornment' })(InputAdornment);