/**
 * syncByVersion 游标同步单测（批次二③）
 *
 * 锁定基于版本号的精确增量恢复不变量：
 * 1. 成功同步并推进持久化游标
 * 2. full_sync=true 时退化（返回 false）
 * 3. 异常时退化（返回 false）
 * 4. 无 version（<=0）时直接退化
 *
 * 对标 Matrix resume 游标：断线恢复从全量轮询升级为精确增量。
 */

import { useMessageStore } from '../store';
import { MessageSyncService } from '../services/MessageSyncService';
import { messageService } from '@/services/message';
import { messageRepository } from '@/database';

function createSyncService(): MessageSyncService {
  return new MessageSyncService(
    () => 'me',
    { markAsRead: async () => {}, markAllAsRead: async () => {} } as any,
    { getSenderInfo: async () => null, enrichMessagesWithSenderInfo: () => {} } as any,
    undefined
  );
}

describe('syncByVersion 游标同步', () => {
  beforeEach(() => {
    useMessageStore.getState().reset();
    (messageRepository as any).__reset();
    (messageService as any).__reset();
  });

  it('无变更时返回成功且推进游标', async () => {
    const serviceMock = messageService as any;
    serviceMock.__setSyncByVersionHandler((version: number) => ({
      current_version: version + 10,
      changes: [],
      full_sync: false,
      has_more: false,
    }));

    const sync = createSyncService();
    const ok = await sync.syncByVersion(100);

    expect(ok).toBe(true);
    // 游标推进到 current_version
    expect(useMessageStore.getState().syncVersion).toBe(110);
  });

  it('full_sync=true 时退化为 false', async () => {
    const serviceMock = messageService as any;
    serviceMock.__setSyncByVersionHandler(() => ({
      current_version: 0,
      changes: [],
      full_sync: true,
      has_more: false,
    }));

    const sync = createSyncService();
    const ok = await sync.syncByVersion(100);

    expect(ok).toBe(false);
  });

  it('API 抛异常时退化为 false', async () => {
    const serviceMock = messageService as any;
    serviceMock.__setSyncByVersionHandler(() => {
      throw new Error('网络故障');
    });

    const sync = createSyncService();
    const ok = await sync.syncByVersion(100);

    expect(ok).toBe(false);
  });

  it('version <= 0 时直接退化', async () => {
    const sync = createSyncService();
    const ok1 = await sync.syncByVersion(0);
    const ok2 = await sync.syncByVersion(-1);
    expect(ok1).toBe(false);
    expect(ok2).toBe(false);
  });

  it('有会话变更时按需同步会话详情', async () => {
    const serviceMock = messageService as any;
    // 先在 store 放一个会话，让 fetchConversationDetail 有上下文
    useMessageStore.getState().setConversationsWithUnread(
      new Map([['c1', { id: 'c1', last_seq: 5, unread_count: 0 } as any]]),
      0, 0
    );

    let detailCalled = false;
    serviceMock.__setSyncByVersionHandler((version: number) => ({
      current_version: version + 5,
      changes: [
        { conversation_id: 'c1', change_type: 'new_message', max_seq: 10, version: version + 1 },
      ],
      full_sync: false,
      has_more: false,
    }));
    // fetchConversationDetail 内部调 getConversationById
    serviceMock.getConversationById = async () => {
      detailCalled = true;
      return { id: 'c1', last_seq: 10 } as any;
    };
    serviceMock.getMessages = async () => ({ messages: [], total: 0, page: 1, page_size: 20 });

    const sync = createSyncService();
    const ok = await sync.syncByVersion(100);

    expect(ok).toBe(true);
    expect(detailCalled).toBe(true);
    expect(useMessageStore.getState().syncVersion).toBe(105);
  });
});