import { describe, expect, it } from 'vitest';
import iconv from 'iconv-lite';
import { normalizeSubtitleBuffer } from '../src/utils/file.js';

describe('normalizeSubtitleBuffer', () => {
  const sample = '1\r\n00:00:01,000 --> 00:00:02,000\r\nÇığ ÖşÜ ıİ\r\n';

  it('keeps valid utf8 Turkish characters intact', () => {
    const buf = Buffer.from(sample, 'utf8');
    const out = normalizeSubtitleBuffer(buf);
    expect(out).toBe('1\n00:00:01,000 --> 00:00:02,000\nÇığ ÖşÜ ıİ\n');
  });

  it('decodes windows-1254 Turkish text correctly', () => {
    const buf = iconv.encode(sample, 'windows-1254');
    const out = normalizeSubtitleBuffer(buf);
    expect(out).toBe('1\n00:00:01,000 --> 00:00:02,000\nÇığ ÖşÜ ıİ\n');
  });

  it('decodes utf16-le BOM correctly', () => {
    const buf = iconv.encode(sample, 'utf16-le');
    const withBom = Buffer.concat([Buffer.from([0xff, 0xfe]), buf]);
    const out = normalizeSubtitleBuffer(withBom);
    expect(out).toBe('1\n00:00:01,000 --> 00:00:02,000\nÇığ ÖşÜ ıİ\n');
  });

  it('repairs mojibake form with \u00fd/\u00fe/\u00f0 Turkish corruption', () => {
    const mojibake = '1\r\n00:00:01,000 --> 00:00:02,000\r\nKýz þöyle dedi: aðýr bir iþ.\r\n';
    const buf = Buffer.from(mojibake, 'utf8');
    const out = normalizeSubtitleBuffer(buf);
    expect(out).toContain('Kız şöyle dedi: ağır bir iş.');
  });
});