import { test, expect } from 'vitest';
import { findWords, isWholeVerse, placeHighlights } from './highlightSpans.js';

const BSB = 'In the beginning God created the heavens and the earth.';
const KJV = 'In the beginning God created the heaven and the earth.';
const hl = (extra) => ({ id: 'h', color: '#fef08a', startOffset: 3, endOffset: 16, text: 'the beginning', translation: 'BSB', ...extra });

test('in the same translation the saved positions are used', () => {
  expect(placeHighlights([hl()], BSB, 'BSB').spans).toEqual([{ start: 3, end: 16, id: 'h', color: '#fef08a' }]);
});

test('in another translation the same words are found where they are, even if they sit elsewhere', () => {
  const other = `And so, ${KJV}`;
  const placed = placeHighlights([hl()], other, 'KJV');
  expect(placed.ghosts).toEqual([]);
  expect(other.slice(placed.spans[0].start, placed.spans[0].end)).toBe('the beginning');
});

test('matching ignores case, punctuation and spacing', () => {
  expect(findWords('And God said, “Let there be light,” and there was light.', 'God said Let there be light')).toEqual({ start: 4, end: 'And God said, “Let there be light'.length });
  expect(findWords('Grace and peace', 'GRACE  and PEACE')).toEqual({ start: 0, end: 15 });
  expect(findWords('Grace and peace', 'of')).toBeNull(); // too short to trust
  expect(findWords('Grace and peace', 'mercy')).toBeNull();
});

test('words the other translation puts differently leave a dot, not a wrong mark', () => {
  const placed = placeHighlights([hl({ startOffset: 22, endOffset: 40, text: 'created the heavens', translation: 'BSB' })], 'In the beginning God made heaven and earth.', 'KJV');
  expect(placed.spans).toEqual([]);
  expect(placed.ghosts).toEqual([{ id: 'h', color: '#fef08a', translation: 'BSB', text: 'created the heavens' }]);
});

test('a whole-verse highlight covers the whole verse in every translation', () => {
  const whole = hl({ startOffset: 0, endOffset: BSB.length, text: BSB, whole: true });
  expect(placeHighlights([whole], 'A much longer verse in another Bible than the first one was.', 'NET').spans).toEqual([{ start: 0, end: 'A much longer verse in another Bible than the first one was.'.length, id: 'h', color: '#fef08a' }]);
  expect(isWholeVerse({ startOffset: 0, endOffset: 500 }, BSB)).toBe(true); // made before the flag existed
  expect(isWholeVerse(hl(), BSB)).toBe(false);
});

test('older highlights with no translation are checked against their words, not trusted blindly', () => {
  const old = { id: 'o', color: '#bbf7d0', startOffset: 3, endOffset: 16, text: 'the beginning' }; // no translation saved
  expect(placeHighlights([old], BSB, 'BSB').spans).toHaveLength(1);
  expect(placeHighlights([old], 'Before time began, God began.', 'NET').ghosts).toHaveLength(1); // the offsets would mark the wrong words here
  expect(placeHighlights([{ ...old, text: undefined }], BSB, 'BSB').spans).toHaveLength(1);
});