import {
  assistantSegmentMessageId,
  lastSegmentPreview,
  normalizeAssistantContentForSplit,
  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 handles spaces inside brackets and fullwidth brackets', () => {
    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('splitMessageParts splits multi-segment content as persisted / WS-joined', () => {
    expect(splitMessageParts('第一段[SPLIT]第二段')).toEqual([
      '第一段',
      '第二段',
    ]);
  });

  it('splitMessageParts falls back to double-newline paragraphs (no [SPLIT] in DB)', () => {
    const a = '太为你高兴了！在上海大剧院的舞台绽放，聚光灯下的你。';
    const b =
      '说到舞台，我忽然想起你黄浦江边的童年。从看着江水流淌，到在舞台上演绎别人的悲欢。';
    expect(splitMessageParts(`${a}\n\n${b}`)).toEqual([a, b]);
  });

  it('splitStreamingSegments keeps empty tail after delimiter', () => {
    /**
     * 流式上下文（!isComplete）下保留尾部空段，让 UI 能在分隔符已出现、第二段尚未到字时
     * 渲染「上一段已完成气泡 + 空流式气泡」。`StreamingBubbles` 在 isComplete=true 时
     * 会过滤掉这只空尾段（见 conversation/[id].tsx 与对应注释），所以底部不会再永久挂一只
     * 假装的「Replying…」气泡。
     */
    expect(splitStreamingSegments('first [SPLIT]')).toEqual(['first', '']);
  });

  it('splitStreamingSegments handles lowercase / fullwidth split markers', () => {
    expect(splitStreamingSegments('a [split] b')).toEqual(['a', 'b']);
    expect(splitStreamingSegments('a【SPLIT】b')).toEqual(['a', 'b']);
    expect(splitStreamingSegments('a [ SPLIT ] b')).toEqual(['a', 'b']);
  });

  it('splitMessageParts accepts spaced / lowercase delimiters', () => {
    expect(splitMessageParts('first [ SPLIT ] second')).toEqual([
      'first',
      'second',
    ]);
    expect(splitMessageParts('first [split] second')).toEqual([
      'first',
      'second',
    ]);
  });

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

  it('assistantSegmentMessageId matches WS / TTS segment binding', () => {
    expect(assistantSegmentMessageId('uuid-a', 0)).toBe('uuid-a_seg_0');
    expect(assistantSegmentMessageId('uuid-a', 1)).toBe('uuid-a_seg_1');
  });

  it('normalizeAssistantContentForSplit maps fullwidth brackets', () => {
    expect(normalizeAssistantContentForSplit('［x］')).toBe('[x]');
    expect(normalizeAssistantContentForSplit('【x】')).toBe('[x]');
  });
});