import React from 'react';
import cn from 'classnames';

interface Props {
  shades: Record<string, string>;
  pathRoot: string;
  path: string;
  diff: Record<string, any>;
}

const getCircularReplacer = () => {
  const seen = new WeakSet();
  // @ts-ignore
  return (key, value) => {
    if (typeof value === 'object' && value !== null) {
      if (seen.has(value)) {
        return;
      }
      seen.add(value);
    }
    return value;
  };
};

function DiffRow({ diff, path }: Props) {
  const [shorten, setShorten] = React.useState(true);
  const [shortenOldVal, setShortenOldVal] = React.useState(true);
  const [shortenNewVal, setShortenNewVal] = React.useState(true);

  const oldValue = diff.item
    ? JSON.stringify(diff.item.lhs, getCircularReplacer(), 1)
    : JSON.stringify(diff.lhs, getCircularReplacer(), 1);
  const newValue = diff.item
    ? JSON.stringify(diff.item.rhs, getCircularReplacer(), 1)
    : JSON.stringify(diff.rhs, getCircularReplacer(), 1);

  const length = path.length;
  const diffLengths = [oldValue?.length || 0, newValue?.length || 0];

  const pathStr =
    length > 20 && shorten ? path.slice(0, 5) + '...' + path.slice(length - 10, length) : path;

  const oldValueSafe =
    diffLengths[0] > 50 && shortenOldVal
      ? `${oldValue.slice(0, 10)} ... ${oldValue.slice(diffLengths[0] - 25, diffLengths[0])}`
      : oldValue;
  const newValueSafe =
    diffLengths[1] > 50 && shortenNewVal
      ? `${newValue.slice(0, 10)} ... ${newValue.slice(diffLengths[1] - 25, diffLengths[1])}`
      : newValue;

  return (
    <div className="p-1 rounded">
      <span className={length > 20 ? 'cursor-pointer' : ''} onClick={() => setShorten(!shorten)}>
        {pathStr}
        {': '}
      </span>
      <span
        onClick={() => setShortenOldVal(!shortenOldVal)}
        className={cn(
          'line-through text-disabled-text',
          diffLengths[0] > 50 ? 'cursor-pointer' : ''
        )}
      >
        {oldValueSafe || 'undefined'}
      </span>
      {' -> '}
      <span
        onClick={() => setShortenNewVal(!shortenNewVal)}
        className={cn(
          'whitespace-pre',
          newValue ? 'text-red' : 'text-green',
          diffLengths[1] > 50 ? 'cursor-pointer' : ''
        )}
      >
        {newValueSafe || 'undefined'}
      </span>
    </div>
  );
}

export default DiffRow;