import React from 'react';
import Props from '@storybook/addon-info/dist/components/Props';
import PropTypes from 'prop-types';

const stylesheet = {
  containerStyle: {},
  tagStyle: {
    color: '#444',
  },
};

function getData(element) {
  const data = {
    name: null,
    text: null,
    children: null,
  };

  if (element === null) {
    return data;
  }

  if (typeof element === 'string') {
    data.text = element;
    return data;
  }

  if (typeof element === 'number') {
    data.text = String.toString(element);
    return data;
  }

  data.children = element.props.children;
  const { type } = element;

  if (typeof type === 'string') {
    data.name = type;
  } else {
    data.name = type.displayName || type.name || 'Unknown';
  }

  return data;
}

export default function Node(props) {
  const {
    node,
    depth,
    maxPropsIntoLine,
    maxPropObjectKeys,
    maxPropArrayLength,
    maxPropStringLength,
  } = props;
  const { tagStyle, containerStyle } = stylesheet;

  const leftPad = {
    paddingLeft: 3 + (depth + 1) * 15,
    paddingRight: 3,
  };

  // Keep a copy so that further mutations to containerStyle don't impact us:
  const containerStyleCopy = Object.assign({}, containerStyle, leftPad);

  const { name, text, children } = getData(node);

  // Just text
  if (!name) {
    return (
      <div style={containerStyleCopy}>
        <span style={tagStyle}>{text}</span>
      </div>
    );
  }

  // Single-line tag
  if (!children) {
    return (
      <div style={containerStyleCopy}>
        <span style={tagStyle}>
          &lt;
          {name}
        </span>
        <Props
          node={node}
          singleLine
          maxPropsIntoLine={maxPropsIntoLine}
          maxPropObjectKeys={maxPropObjectKeys}
          maxPropArrayLength={maxPropArrayLength}
          maxPropStringLength={maxPropStringLength}
        />
        <span style={tagStyle}>/&gt;</span>
      </div>
    );
  }

  // tag with children
  return (
    <div>
      <div style={containerStyleCopy}>
        <span style={tagStyle}>
          &lt;
          {name}
        </span>
        <Props
          node={node}
          maxPropsIntoLine={maxPropsIntoLine}
          maxPropObjectKeys={maxPropObjectKeys}
          maxPropArrayLength={maxPropArrayLength}
          maxPropStringLength={maxPropStringLength}
        />
        <span style={tagStyle}>&gt;</span>
      </div>
      {React.Children.map(children, childElement => (
        <Node
          node={childElement}
          depth={depth + 1}
          maxPropsIntoLine={maxPropsIntoLine}
          maxPropObjectKeys={maxPropObjectKeys}
          maxPropArrayLength={maxPropArrayLength}
          maxPropStringLength={maxPropStringLength}
        />
      ))}
      <div style={containerStyleCopy}>
        <span style={tagStyle}>
          &lt;/
          {name}
          &gt;
        </span>
      </div>
    </div>
  );
}

Node.defaultProps = {
  node: null,
  depth: 0,
};

Node.propTypes = {
  node: PropTypes.node,
  depth: PropTypes.number,
  maxPropsIntoLine: PropTypes.number.isRequired,
  maxPropObjectKeys: PropTypes.number.isRequired,
  maxPropArrayLength: PropTypes.number.isRequired,
  maxPropStringLength: PropTypes.number.isRequired,
};