import ethers from 'ethers';
import { isEmpty } from '@ember/utils';

// Derives a stable grouping key for a contribution, so that contributions
// created for the same issue/pull request (one per contributor) can be
// linked together in the UI.
//
// The key is a 6-char keccak256 prefix of a combination of fields:
// url (optional), description, date, amount, kind. When the URL is present
// (bot contributions) it is included; when absent (manual contributions)
// the remaining fields still produce a reliable key. All of description,
// date, amount, and kind must be present — if any is missing, the
// contribution is treated as a singleton (null key).

export default function contributionGroupingKey (contribution) {
  if (!contribution) return null;

  const { url, description, date, amount, kind } = contribution;

  if (isEmpty(description) || isEmpty(date) || isEmpty(amount) || isEmpty(kind)) {
    return null;
  }

  const input = isEmpty(url)
    ? `${description}|${date}|${amount}|${kind}`
    : `${url}|${description}|${date}|${amount}|${kind}`;

  return ethers.utils.id(input).slice(2, 8);
}