import { describe, it, expect } from 'vitest';
import path from 'node:path';
import { detectInputMime, outputMimeType } from '../src/mime.js';

describe('detectInputMime', () => {
  it('detects PNG from magic bytes regardless of file extension', async () => {
    const fixturePath = path.join(import.meta.dirname, 'fixtures', 'sample.png');

    const result = await detectInputMime(fixturePath);

    expect(result).toEqual({ ext: 'png', mime: 'image/png' });
  });
});

describe('outputMimeType', () => {
  it('returns the MIME type for a known target format', () => {
    expect(outputMimeType('pdf')).toBe('application/pdf');
    expect(outputMimeType('png')).toBe('image/png');
    expect(outputMimeType('docx')).toBe(
      'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
    );
  });

  it('throws for an unknown target format', () => {
    expect(() => outputMimeType('made-up-format')).toThrowError(/made-up-format/);
  });
});