import { buildFfmpegCompositionArgs } from '../src/recording/composer';
import { ServerTrackRecordingFile } from '../src/recording/storage';

function file(filename: string, trackKind: string, participantId: string, role = 'participant'): ServerTrackRecordingFile {
  return {
    meetingId: 'room-1',
    directory: 'recordings/room-1',
    filename,
    filePath: `recordings/room-1/${filename}`,
    metadataPath: `recordings/room-1/${filename}.json`,
    recordingId: 'recording-1',
    participantId,
    trackId: `${participantId}-${trackKind}`,
    trackKind,
    uploadedAt: '2026-06-01T00:00:00.000Z',
    metadata: { role }
  };
}

describe('recording composer', () => {
  test('builds ffmpeg args for host-led video layout and mixed audio', () => {
    const args = buildFfmpegCompositionArgs({
      videoInputs: [
        file('p1-video.webm', 'video', 'p1', 'host'),
        file('p2-video.webm', 'video', 'p2')
      ],
      audioInputs: [
        file('p1-audio.webm', 'audio', 'p1'),
        file('p2-audio.webm', 'audio', 'p2')
      ],
      outputPath: 'recordings/room-1/output.webm',
      format: 'webm'
    });

    expect(args).toContain('-filter_complex');
    expect(args.join(' ')).toContain('xstack=inputs=2');
    expect(args.join(' ')).toContain('scale=1280:540');
    expect(args.join(' ')).toContain('scale=1280:180');
    expect(args.join(' ')).toContain('layout=0_0|0_540');
    expect(args.join(' ')).toContain('amix=inputs=2');
    expect(args).toContain('libvpx-vp9');
    expect(args).toContain('libopus');
    expect(args[args.length - 1]).toBe('recordings/room-1/output.webm');
  });

  test('places host in the first row even when host input is not first', () => {
    const args = buildFfmpegCompositionArgs({
      videoInputs: [
        file('p1-video.webm', 'video', 'p1'),
        file('host-video.webm', 'video', 'host', 'host'),
        file('p2-video.webm', 'video', 'p2')
      ],
      audioInputs: [],
      outputPath: 'recordings/room-1/output.webm',
      format: 'webm'
    });

    const filter = args[args.indexOf('-filter_complex') + 1];
    expect(args.slice(0, 7)).toEqual([
      '-y',
      '-i',
      'recordings/room-1/host-video.webm',
      '-i',
      'recordings/room-1/p1-video.webm',
      '-i',
      'recordings/room-1/p2-video.webm'
    ]);
    expect(filter).toContain('scale=1280:540');
    expect(filter).toContain('scale=640:180');
    expect(filter).toContain('layout=0_0|0_540|640_540');
  });

  test('builds mp4 encoder args', () => {
    const args = buildFfmpegCompositionArgs({
      videoInputs: [file('p1-video.webm', 'video', 'p1')],
      audioInputs: [],
      outputPath: 'recordings/room-1/output.mp4',
      format: 'mp4'
    });

    expect(args).toContain('libx264');
    expect(args).toContain('-pix_fmt');
    expect(args).not.toContain('libopus');
  });
});