import { Data } from "csl-json";

export type BibOrder = {
  comparison: (c1: Data, c2: Data) => number;
  inform_citations: boolean;
};

export function nameYearTitle(citation_1: Data, citation_2: Data) {
  /* NAME */
  const author_1 = citation_1.author[0];
  const author_2 = citation_2.author[0];

  // family name
  let cmp = author_1.family.localeCompare(author_2.family);
  if (cmp != 0) {
    return cmp;
  }

  // given name
  cmp = author_1.given.localeCompare(author_2.given);
  if (cmp != 0) {
    return cmp;
  }

  /* YEAR */
  const year_1: number = <number>(<unknown>citation_1.issued["date-parts"][0]);
  const year_2: number = <number>(<unknown>citation_2.issued["date-parts"][0]);
  cmp = year_1 - year_2;
  if (cmp != 0) {
    return cmp;
  }

  /* TITLE */
  return citation_1.title.localeCompare(citation_2.title);
}

export function insertion(citation_1: Data, citation_2: Data) {
  return 0; // all are equivalent -> do not sort
}

export const comparisons = {
  nameYearTitle: nameYearTitle,
  nyt: nameYearTitle,
  insertion: insertion,
};