import 'package:flutter_test/flutter_test.dart';
import 'package:pj_supermarket_cloud/common/index.dart';

String marked(String text, String kw) {
  final ranges = SearchHighlightTool.matchRanges(text, kw);
  final buf = StringBuffer();
  int cursor = 0;
  final runes = text.runes.toList();
  for (final r in ranges) {
    if (r.start < cursor) continue;
    if (r.start > cursor) {
      buf.write(String.fromCharCodes(runes.sublist(cursor, r.start)));
    }
    buf.write('[${String.fromCharCodes(runes.sublist(r.start, r.end))}]');
    cursor = r.end;
  }
  if (cursor < runes.length) buf.write(String.fromCharCodes(runes.sublist(cursor)));
  return buf.toString();
}

void main() {
  test('商品名直接命中', () {
    expect(marked('康师傅红烧方便面', '方便'), '康师傅红烧[方便]面');
  });

  test('多次出现全部高亮', () {
    expect(marked('可口可乐可乐瓶装', '可乐'), '可口[可乐][可乐]瓶装');
  });

  test('大小写不敏感', () {
    expect(marked('CocaCola 500ml', 'cola'), 'Coca[Cola] 500ml');
  });

  test('条码直接命中', () {
    expect(marked('6901234567892', '1234'), '690[1234]567892');
  });

  test('拼音首字母头部命中', () {
    expect(marked('康师傅红烧方便面', 'ksf'), '[康师傅]红烧方便面');
  });

  test('拼音首字母中部命中', () {
    expect(marked('康师傅红烧方便面', 'fhs'), '康师[傅红烧]方便面');
  });

  test('拼音首字母尾部命中', () {
    expect(marked('康师傅红烧方便面', 'fbm'), '康师傅红烧[方便面]');
  });

  test('汉字与字母混合拼音命中', () {
    expect(marked('农夫山泉550ml', 'nfsq'), '[农夫山泉]550ml');
  });

  test('无命中不高亮', () {
    expect(marked('康师傅红烧方便面', 'zzz'), '康师傅红烧方便面');
  });

  test('空关键字不高亮', () {
    expect(marked('康师傅红烧方便面', ''), '康师傅红烧方便面');
    expect(marked('康师傅红烧方便面', '  '), '康师傅红烧方便面');
  });
}