import React from 'react';
import PropTypes from 'prop-types';
import classNames from 'classnames';
import withStyles from '../styles/withStyles';

export const styles = {
  /* Styles applied to the root element. */
  root: {
    listStyle: 'none',
    margin: 0,
    padding: 0,
    position: 'relative',
  },
  /* Styles applied to the root element if `disablePadding={false}`. */
  padding: {
    paddingTop: 8,
    paddingBottom: 8,
  },
  /* Styles applied to the root element if `dense={true}` & `disablePadding={false}`. */
  dense: {
    paddingTop: 4,
    paddingBottom: 4,
  },
  /* Styles applied to the root element if a `subheader` is provided. */
  subheader: {
    paddingTop: 0,
  },
};

class List extends React.Component {
  getChildContext() {
    return {
      dense: this.props.dense,
    };
  }

  render() {
    const {
      children,
      classes,
      className: classNameProp,
      component: Component,
      dense,
      disablePadding,
      subheader,
      ...other
    } = this.props;
    const className = classNames(
      classes.root,
      {
        [classes.dense]: dense && !disablePadding,
        [classes.padding]: !disablePadding,
        [classes.subheader]: subheader,
      },
      classNameProp,
    );

    return (
      <Component className={className} {...other}>
        {subheader}
        {children}
      </Component>
    );
  }
}

List.propTypes = {
  /**
   * The content of the component.
   */
  children: PropTypes.node,
  /**
   * Override or extend the styles applied to the component.
   * See [CSS API](#css-api) below for more details.
   */
  classes: PropTypes.object.isRequired,
  /**
   * @ignore
   */
  className: PropTypes.string,
  /**
   * The component used for the root node.
   * Either a string to use a DOM element or a component.
   */
  component: PropTypes.oneOfType([PropTypes.string, PropTypes.func, PropTypes.object]),
  /**
   * If `true`, compact vertical padding designed for keyboard and mouse input will be used for
   * the list and list items. The property is available to descendant components as the
   * `dense` context.
   */
  dense: PropTypes.bool,
  /**
   * If `true`, vertical padding will be removed from the list.
   */
  disablePadding: PropTypes.bool,
  /**
   * The content of the subheader, normally `ListSubheader`.
   */
  subheader: PropTypes.node,
};

List.defaultProps = {
  component: 'ul',
  dense: false,
  disablePadding: false,
};

List.childContextTypes = {
  dense: PropTypes.bool,
};

export default withStyles(styles, { name: 'MuiList' })(List);
