// @vitest-environment node
import { test, expect } from 'vitest';
import { MIN_GAP_MS, pack, shouldSnapshot, summarizeProject, unpack } from './versions.js';

test('a version is kept once per window of editing, and always the first', () => {
  const t = 1_800_000_000_000;
  expect(shouldSnapshot({ prevEditedAt: t, lastKeptAt: undefined })).toBe(true);
  expect(shouldSnapshot({ prevEditedAt: t, lastKeptAt: t - 60_000 })).toBe(false); // a minute after the last one
  expect(shouldSnapshot({ prevEditedAt: t, lastKeptAt: t - MIN_GAP_MS })).toBe(true);
  expect(shouldSnapshot({ prevEditedAt: t, lastKeptAt: t - 1000, force: true })).toBe(true); // before a restore
  expect(shouldSnapshot({ prevEditedAt: undefined, lastKeptAt: undefined })).toBe(false); // nothing to keep
});

test('a stored copy round-trips and is smaller than the original', () => {
  const study = { id: 'a', title: 'T', chapters: [{ verses: Array.from({ length: 200 }, (_, i) => ({ number: i, text: 'In the beginning God created the heavens and the earth.' })) }] };
  const packed = pack(study);
  expect(packed.length).toBeLessThan(JSON.stringify(study).length / 5);
  expect(unpack(packed)).toEqual(study);
});

test('a study is summarised by its chunks and the words in its notes', () => {
  const s = summarizeProject({ chapters: [{ chunks: [{ observation: 'one two three', application: ' four ' }, { finalScript: 'a b' }] }, { chunks: [{}] }] });
  expect(s).toEqual({ chunks: 3, words: 6 });
  expect(summarizeProject(null)).toEqual({ chunks: 0, words: 0 });
});