// Author: fruit.com.cn

import 'package:flutter_test/flutter_test.dart';
import 'package:fruitshorts/core/data/models/notice.dart';
import 'package:fruitshorts/core/data/remote/api_client.dart';
import 'package:fruitshorts/core/data/repositories/notice_repository.dart';
import 'package:fruitshorts/core/data/services/notices_controller.dart';

void main() {
  test('should_append_next_page_until_loaded_count_reaches_total', () async {
    final repository = ScriptedNoticeRepository([
      NoticePage(total: 3, notices: [_notice('1'), _notice('2')]),
      NoticePage(total: 3, notices: [_notice('3')]),
    ]);
    final controller = NoticesController(repository);

    await controller.load();
    expect(controller.notices.map((item) => item.id), ['1', '2']);
    expect(controller.hasMore, isTrue);

    await controller.loadMore();
    expect(controller.notices.map((item) => item.id), ['1', '2', '3']);
    expect(controller.hasMore, isFalse);
    expect(repository.calls.map((call) => call.pageIndex), [1, 2]);
  });

  test('should_show_empty_state_when_total_is_zero', () async {
    final controller = NoticesController(
      ScriptedNoticeRepository([const NoticePage(total: 0)]),
    );

    await controller.load();

    expect(controller.loading, isFalse);
    expect(controller.notices, isEmpty);
    expect(controller.hasMore, isFalse);
    expect(controller.error, isNull);
  });

  test('should_preserve_backend_message_when_page_load_fails', () async {
    final repository = ScriptedNoticeRepository([])
      ..error = const ApiException(500, '公告服务暂不可用');
    final controller = NoticesController(repository);

    await controller.load();

    expect(controller.error, '公告服务暂不可用');
    expect(controller.notices, isEmpty);
  });

  test('should_replace_list_when_refreshed', () async {
    final repository = ScriptedNoticeRepository([
      NoticePage(total: 2, notices: [_notice('1'), _notice('2')]),
      NoticePage(total: 1, notices: [_notice('9')]),
    ]);
    final controller = NoticesController(repository);
    await controller.load();

    await controller.refresh();

    expect(controller.notices.map((item) => item.id), ['9']);
    expect(controller.hasMore, isFalse);
  });
}

AppNotice _notice(String id) => AppNotice(
  id: id,
  title: 'Notice $id',
  content: 'Content $id',
  type: 'SYSTEM',
  publishAt: DateTime(2026, 10, 17, 12),
);

class ScriptedNoticeRepository implements NoticeRepository {
  ScriptedNoticeRepository(this.pages);

  final List<NoticePage> pages;
  final List<NoticePageCall> calls = [];
  Object? error;

  @override
  Future<NoticePage> page({required int pageIndex, int pageSize = 20}) async {
    calls.add(NoticePageCall(pageIndex: pageIndex, pageSize: pageSize));
    if (error != null) throw error!;
    if (pages.isEmpty) return const NoticePage(total: 0);
    return pages.removeAt(0);
  }
}

class NoticePageCall {
  const NoticePageCall({required this.pageIndex, required this.pageSize});

  final int pageIndex;
  final int pageSize;
}