// Tests for the correction-tracking heuristic — should not flood the
// memories table with whitespace-only or single-word fixes on long
// outputs, but must capture all real edits.

import { describe, expect, it } from 'vitest';
import { isMeaningfulChange } from './correction-tracker';

describe('isMeaningfulChange', () => {
  it('returns false for empty strings', () => {
    expect(isMeaningfulChange('', 'anything')).toBe(false);
    expect(isMeaningfulChange('anything', '')).toBe(false);
  });

  it('returns false when the trimmed text is identical', () => {
    expect(isMeaningfulChange('hello', 'hello')).toBe(false);
    expect(isMeaningfulChange('hello\n', '  hello  ')).toBe(false);
  });

  it('returns true for short edits even with small word/char diffs', () => {
    // The 100-char threshold guards against noise on LONG outputs only.
    // Short edits always count.
    expect(isMeaningfulChange('hi', 'hi.')).toBe(true);
    expect(isMeaningfulChange('hi', 'hello')).toBe(true);
  });

  it('rejects single-word, ≤20-char edits on long original output', () => {
    const long = 'Patient is a 5-year-old male presenting with fever for two days. ' +
      'No respiratory symptoms. No GI symptoms. Vitals stable. Exam unremarkable. ' +
      'Plan: supportive care, return precautions reviewed.';
    // Same length, swap one word — wordDiff=0, charDiff=0 → noise, skip.
    expect(isMeaningfulChange(long, long.replace('male', 'mail'))).toBe(false);
    // Same length, swap one word for similar length — still noise, skip.
    expect(isMeaningfulChange(long, long.replace('two days', 'one day '))).toBe(false);
  });

  it('accepts multi-word edits even on long output', () => {
    const long = 'Patient is a 5-year-old male presenting with fever for two days. ' +
      'No respiratory symptoms. No GI symptoms. Vitals stable. Exam unremarkable. ' +
      'Plan: supportive care, return precautions reviewed.';
    // Inserting a sentence is a real edit — track it.
    const edited = long + ' Will follow up in 48 hours if symptoms persist.';
    expect(isMeaningfulChange(long, edited)).toBe(true);
  });

  it('accepts single-word edits when the char diff is large enough', () => {
    const long = 'a'.repeat(150);
    // 30-char insertion — over the 20-char noise floor.
    expect(isMeaningfulChange(long, long + 'x'.repeat(30))).toBe(true);
  });
});