import {
  lastSegmentPreview,
  splitMessageParts,
  splitStreamingSegments,
} from '@/features/conversation/message-split';

describe('message-split', () => {
  it('splitMessageParts is case-insensitive on delimiter', () => {
    expect(splitMessageParts('a [SPLIT] b')).toEqual(['a', 'b']);
    expect(splitMessageParts('a [split] b')).toEqual(['a', 'b']);
    expect(splitMessageParts('a [Split] b')).toEqual(['a', 'b']);
  });

  it('splitMessageParts trims and drops empty segments', () => {
    expect(splitMessageParts('  x  [SPLIT]  y  ')).toEqual(['x', 'y']);
    expect(splitMessageParts('[SPLIT]only')).toEqual(['only']);
  });

  it('splitStreamingSegments keeps empty tail after delimiter', () => {
    expect(splitStreamingSegments('first [SPLIT]')).toEqual(['first', '']);
  });

  it('lastSegmentPreview uses last non-empty part', () => {
    expect(lastSegmentPreview('a [SPLIT] b', 10)).toBe('b');
    expect(lastSegmentPreview('hello', 3)).toBe('hel');
  });
});