import { TestBed } from '@angular/core/testing';
import { ChatSessionService } from './chat-session.service';
import { FmodeApi } from './api/fmode-api';
import { SessionService } from './session.service';
import { legacySessionId } from './chat-session';

/**
 * ChatSessionService —— 会话目录的唯一 owner。
 *
 * 覆盖：新建 / 归档 / 重命名 / 移除黑名单 / 云端单向同步 / 持久化。
 * 这些是「多会话」的数据底座，错一个字段用户就会看到串号的对话名。
 */

/**
 * 以「带 FmodeApi 桩」的方式构造服务实例。
 *
 * 文件级声明：多个 describe 都要用它构造独立实例，
 * 每次重建都拿到干净的 signal 状态（`resetTestingModule`）。
 */
function withApiStub(api: Record<string, unknown>): ChatSessionService {
  TestBed.resetTestingModule();
  TestBed.configureTestingModule({
    providers: [
      ChatSessionService,
      { provide: SessionService, useValue: { me: () => ({ id: 'u1' }) } },
      { provide: FmodeApi, useValue: api },
    ],
  });
  const s2 = TestBed.inject(ChatSessionService);
  s2.load();
  return s2;
}

describe('ChatSessionService', () => {
  let svc: ChatSessionService;

  beforeEach(() => {
    localStorage.clear();
    TestBed.configureTestingModule({
      providers: [
        ChatSessionService,
        { provide: SessionService, useValue: { me: () => ({ id: 'u1' }) } },
      ],
    });
    svc = TestBed.inject(ChatSessionService);
    svc.reset();
  });

  afterEach(() => localStorage.clear());

  const ROOM = '!room1:fmode.cn';
  const AGENT = 'agent-a';

  it('新建会话:标题默认「新对话」、未归档、计数 0', () => {
    const s = svc.create(ROOM, AGENT);
    expect(s.title).toBe('新对话');
    expect(s.archived).toBeFalse();
    expect(s.messageCount).toBe(0);
    expect(s.roomId).toBe(ROOM);
    expect(s.agentId).toBe(AGENT);
  });

  it('create 生成独立线程根、同容器可并存多条', () => {
    const a = svc.create(ROOM, AGENT);
    const b = svc.create(ROOM, AGENT);
    expect(b.id).not.toBe(a.id);
    expect(svc.listFor(AGENT).length).toBe(2);
  });

  it('为什么服务端认为是同一个 agent 的不同容器 —— 会话互不可见', () => {
    svc.create(ROOM, 'agent-a');
    svc.create(ROOM, 'agent-b');
    expect(svc.listFor('agent-a').length).toBe(1);
    expect(svc.listFor('agent-b').length).toBe(1);
  });

  it('归档后默认列表不含它，但可按 id 取到（链接可打开）', () => {
    const s = svc.create(ROOM, AGENT);
    svc.archive(s.id);
    expect(svc.listFor(AGENT)).toEqual([]);
    expect(svc.listFor(AGENT, { includeArchived: true }).length).toBe(1);
    expect(svc.byId(s.id)?.archived).toBeTrue();
  });

  it('取消归档后回到列表', () => {
    const s = svc.create(ROOM, AGENT);
    svc.archive(s.id);
    svc.archive(s.id, false);
    expect(svc.listFor(AGENT).length).toBe(1);
  });

  it('重命名会锁定标题，之后消息不再覆盖', () => {
    const s = svc.create(ROOM, AGENT);
    svc.rename(s.id, '  我的任务  ');
    const renamed = svc.byId(s.id)!;
    expect(renamed.title).toBe('我的任务');
    expect(renamed.titleLocked).toBeTrue();

    svc.noteMessage(s.id, { text: '新消息内容', ts: Date.now(), fromMe: true });
    expect(svc.byId(s.id)!.title).toBe('我的任务');
  });

  it('重命名空字符串被忽略', () => {
    const s = svc.create(ROOM, AGENT);
    svc.rename(s.id, '   ');
    expect(svc.byId(s.id)!.title).toBe('新对话');
  });

  it('用户首条消息推导标题', () => {
    const s = svc.create(ROOM, AGENT);
    svc.noteMessage(s.id, { text: '帮我做个登录页', ts: 2000, fromMe: true });
    expect(svc.byId(s.id)!.title).toBe('做个登录页');
  });


  describe('remove（用户主动移除）', () => {
    it('移除后从列表消失', () => {
      const s = svc.create(ROOM, AGENT);
      svc.remove(s.id);
      expect(svc.byId(s.id)).toBeUndefined();
    });

    it('🔴 移除的线程不会被下一次云端拉取复活', async () => {
      const svc2 = withApiStub({
        fetchChatThreads: async (_a: string, o?: { includeDeleted?: boolean }) =>
          o?.includeDeleted
            ? []
            : [
                {
                  objectId: 'x', agentId: AGENT, roomId: ROOM, threadRoot: '$gone',
                  title: '被移除的对话', titleLocked: false, messageCount: 5,
                  lastMessageAt: 100, archived: false, lastPreview: '',
                },
              ],
        upsertChatThreads: async () => undefined,
        removeChatThread: async () => undefined,
      });
      svc2.adopt({ id: '$gone', roomId: ROOM, agentId: AGENT });
      svc2.remove('$gone');
      await svc2.hydrateFromCloud(AGENT);
      expect(svc2.byId('$gone')).withContext('被移除的线程又回来了').toBeUndefined();
    });

    it('isRemoved 能查到移除记录', () => {
      const s = svc.create(ROOM, AGENT);
      expect(svc.isRemoved(s.id)).toBeFalse();
      svc.remove(s.id);
      expect(svc.isRemoved(s.id)).toBeTrue();
    });

    it('移除记录会持久化', () => {
      const s = svc.create(ROOM, AGENT);
      svc.remove(s.id);
      svc.reset();
      svc.load();
      expect(svc.isRemoved(s.id)).withContext('重载后黑名单丢了').toBeTrue();
    });
  });

  describe('历史对话（承接无 thread 旧消息）', () => {
    it('首次创建返回 created=true', () => {
      const r = svc.adoptLegacy(ROOM, AGENT, '旧消息预览');
      expect(r.created).toBeTrue();
      expect(r.session.id).toBe(legacySessionId(ROOM));
      expect(r.session.title).toBe('历史对话');
      expect(r.session.legacy).toBeTrue();
      expect(r.session.titleLocked).withContext('历史会话不改名').toBeTrue();
    });

    it('幂等:重复调用返回 created=false 且不重复添加', () => {
      svc.adoptLegacy(ROOM, AGENT);
      const again = svc.adoptLegacy(ROOM, AGENT);
      expect(again.created).toBeFalse();
      expect(svc.listFor(AGENT).length).toBe(1);
    });

    it('不同房间的历史会话 id 不同', () => {
      expect(legacySessionId('!a:x')).not.toBe(legacySessionId('!b:x'));
    });
  });

  describe('持久化', () => {
    it('新建后写入 localStorage（v2 缓存键，按用户隔离）', () => {
      const s = svc.create(ROOM, AGENT);
      const raw = localStorage.getItem('fmode_chat_sessions_v2_u1');
      expect(raw).withContext('未按用户隔离存储').toBeTruthy();
      expect(JSON.parse(raw!)[0].id).toBe(s.id);
    });

    it('重新载入能恢复会话', () => {
      const s = svc.create(ROOM, AGENT);
      svc.reset();
      svc.load();
      expect(svc.byId(s.id)).toBeDefined();
    });

    // 换账号不能看到上一个账号的会话
    it('🔴 换用户后不串号', () => {
      svc.create(ROOM, AGENT);
      expect(svc.all().length).toBe(1);
      // 切换成另一个用户
      TestBed.resetTestingModule();
      TestBed.configureTestingModule({
        providers: [
          ChatSessionService,
          { provide: SessionService, useValue: { me: () => ({ id: 'u2' }) } },
        ],
      });
      const other = TestBed.inject(ChatSessionService);
      other.load();
      expect(other.all()).withContext('读到了别人的会话').toEqual([]);
    });

    it('坏 JSON 不影响后续使用（降级为空列表）', () => {
      localStorage.setItem('fmode_chat_sessions_u1', '{{{ 不是 json');
      svc.reset();
      expect(() => svc.load()).not.toThrow();
      expect(svc.all()).toEqual([]);
    });

    it('缺字段的脏数据被过滤', () => {
      localStorage.setItem(
        'fmode_chat_sessions_v2_u1',
        JSON.stringify([{ id: '$x' }, { id: '$ok', roomId: '!r:x', agentId: 'a', title: 't', createdAt: 1, updatedAt: 1 }]),
      );
      svc.reset();
      svc.load();
      expect(svc.all().length).toBe(1);
      expect(svc.all()[0].id).toBe('$ok');
    });
  });

  describe('threadIdsOf', () => {
    it('返回该房间下所有会话的线程根', () => {
      const a = svc.create(ROOM, AGENT);
      const b = svc.create(ROOM, 'agent-b');
      svc.create('!other:x', AGENT);
      const ids = svc.threadIdsOf(ROOM);
      expect(ids.has(a.id)).toBeTrue();
      expect(ids.has(b.id)).toBeTrue();
      expect(ids.size).toBe(2);
    });
  });

  describe('消息推进必须同步云端（2026-11-01）', () => {
    const ROOM = '!room1:fmode.cn';
    const AGENT = 'agent-a';

    beforeEach(() => localStorage.clear());

    /*
     * 🔴 回归：历史会话名称加载不对，显示成「新对话」。
     *
     * 根因：`noteMessage` 只写本地，标题/计数/时间从不推云端。
     * 云端那条记录永远停在「新对话 / 0 条」，换设备或重新拉列表就退回默认名。
     */
    it('🔴 首条消息确定标题后必须推送到云端', async () => {
      const upsert = jasmine.createSpy('upsert').and.returnValue(Promise.resolve());
      const svc2 = withApiStub({
        fetchChatThreads: async (_a: string, o?: { includeDeleted?: boolean }) => (o?.includeDeleted ? [] : []),
        upsertChatThreads: upsert,
      });
      await svc2.hydrateFromCloud(AGENT);
      const s = svc2.create(ROOM, AGENT);
      upsert.calls.reset();

      svc2.noteMessage(s.id, { text: '帮我做个登录页', ts: Date.now(), fromMe: true });

      expect(upsert).withContext('标题变了必须推云端，否则换设备退回「新对话」').toHaveBeenCalled();
      const pushed = upsert.calls.mostRecent().args[0][0];
      expect(pushed.title).toBe('做个登录页');
      expect(pushed.threadRoot).toBe(s.id);
    });

    it('同一会话短时间内重复消息不重复打接口（节流）', async () => {
      const upsert = jasmine.createSpy('upsert').and.returnValue(Promise.resolve());
      const svc2 = withApiStub({
        fetchChatThreads: async (_a: string, o?: { includeDeleted?: boolean }) => (o?.includeDeleted ? [] : []),
        upsertChatThreads: upsert,
      });
      await svc2.hydrateFromCloud(AGENT);
      const s = svc2.create(ROOM, AGENT);
      upsert.calls.reset();

      // 首条定标题（触发一次）
      svc2.noteMessage(s.id, { text: '第一条', ts: 1000, fromMe: true });
      const afterFirst = upsert.calls.count();
      // 紧随其后的几条只改计数，不应再推
      svc2.noteMessage(s.id, { text: '第二条', ts: 1001, fromMe: true });
      svc2.noteMessage(s.id, { text: '第三条', ts: 1002, fromMe: true });

      expect(upsert.calls.count()).withContext('计数变化不该每条都打接口').toBe(afterFirst);
    });
  });

  describe('工作区归属（2026-11-01 上云）', () => {
    const ROOM = '!room1:fmode.cn';
    const AGENT = 'agent-a';
    const WS = 'ws-1';

    beforeEach(() => localStorage.clear());

    /*
     * 🔴 回归：用户反馈「在工作区里新建对话，结果跑到下面日常对话里去了」。
     *
     * 根因：归属只存本地，`hydrateFromCloud` 重建列表时靠本地缓存「捡」，
     * 捡不到就回落 null（日常）。现在云端是权威来源。
     */
    it('🔴 云端返回的 workspaceId 必须覆盖本地为空的归属', async () => {
      const svc2 = withApiStub({
        fetchChatThreads: async (_a: string, o?: { includeDeleted?: boolean }) =>
          o?.includeDeleted
            ? []
            : [
                { objectId: 'x', agentId: AGENT, roomId: ROOM, threadRoot: '$w', title: 't', titleLocked: false, messageCount: 2, lastMessageAt: 9, archived: false, lastPreview: '', workspaceId: WS },
              ],
        upsertChatThreads: async () => undefined,
      });
      await svc2.hydrateFromCloud(AGENT);
      expect(svc2.byId('$w')?.workspaceId).withContext('归属丢了会掉进日常对话').toBe(WS);
    });

    it('moveTo 会把归属推到云端', async () => {
      const patch = jasmine.createSpy('patch').and.returnValue(Promise.resolve());
      const svc2 = withApiStub({
        fetchChatThreads: async (_a: string, o?: { includeDeleted?: boolean }) =>
          o?.includeDeleted
            ? []
            : [
                { objectId: 'x', agentId: AGENT, roomId: ROOM, threadRoot: '$w', title: 't', titleLocked: false, messageCount: 2, lastMessageAt: 9, archived: false, lastPreview: '' },
              ],
        upsertChatThreads: async () => undefined,
        patchChatThread: patch,
      });
      await svc2.hydrateFromCloud(AGENT);
      svc2.moveTo('$w', WS);
      expect(patch).toHaveBeenCalledWith({ threadRoot: '$w', workspaceId: WS });
      expect(svc2.byId('$w')?.workspaceId).toBe(WS);
    });

    it('移回日常对话时云端收到空字符串（不是不传）', async () => {
      const patch = jasmine.createSpy('patch').and.returnValue(Promise.resolve());
      const svc2 = withApiStub({
        fetchChatThreads: async (_a: string, o?: { includeDeleted?: boolean }) =>
          o?.includeDeleted
            ? []
            : [
                { objectId: 'x', agentId: AGENT, roomId: ROOM, threadRoot: '$w', title: 't', titleLocked: false, messageCount: 2, lastMessageAt: 9, archived: false, lastPreview: '', workspaceId: WS },
              ],
        upsertChatThreads: async () => undefined,
        patchChatThread: patch,
      });
      await svc2.hydrateFromCloud(AGENT);
      svc2.moveTo('$w', null);
      expect(patch).toHaveBeenCalledWith({ threadRoot: '$w', workspaceId: '' });
      expect(svc2.byId('$w')?.workspaceId).toBeNull();
    });
  });

  describe('云端会话目录（2026-11-01 单向同步）', () => {
    const ROOM = '!room1:fmode.cn';
    const AGENT = 'agent-a';

    beforeEach(() => localStorage.clear());

    /** 以「带 FmodeApi 桩」的方式重建服务（内部用；原 `withApi` 已改为文件级 `withApiStub`） */
    function withApi(api: Record<string, unknown>): ChatSessionService {
      return withApiStub(api);
    }

    it('云端有新会话、本地为空 → 重建到本地（换浏览器场景）', async () => {
      const svc2 = withApi({
        fetchChatThreads: async (_a: string, o?: { includeDeleted?: boolean }) =>
          o?.includeDeleted
            ? []
            : [
          {
            objectId: 'x1', agentId: AGENT, roomId: ROOM, threadRoot: '$cloud1',
            title: '云端会话', titleLocked: false, messageCount: 3,
            lastMessageAt: 1000, archived: false, lastPreview: 'hi',
          },
              ],
        upsertChatThreads: async () => undefined,
      });
      await svc2.hydrateFromCloud(AGENT);
      expect(svc2.byId('$cloud1')?.title).toBe('云端会话');
      expect(svc2.byId('$cloud1')?.messageCount).toBe(3);
    });

    it('已移除的线程不会被云端复活', async () => {
      const svc2 = withApi({
        fetchChatThreads: async (_a: string, o?: { includeDeleted?: boolean }) =>
          o?.includeDeleted
            ? []
            : [
          { objectId: 'x', agentId: AGENT, roomId: ROOM, threadRoot: '$gone', title: 'a', titleLocked: false, messageCount: 1, lastMessageAt: 1, archived: false, lastPreview: '' },
              ],
        upsertChatThreads: async () => undefined,
        removeChatThread: async () => undefined,
      });
      const s0 = svc2.create(ROOM, AGENT);
      svc2.remove(s0.id);
      await svc2.hydrateFromCloud(AGENT);
      expect(svc2.byId(s0.id)).toBeUndefined();
    });

    /*
     * 🔴 行为变更（2026-11-01）：单向同步下**云端标题才是权威**。
     *
     * 旧断言「本地锁定标题不被云端覆盖」在合并式同步下成立，但正是它允许了
     * 「本地与云端各说各话」——改名推云端失败后，本地会永远保留一个云端不知道的标题。
     * 现在：改名会立刻 `patchChatThread` 推云端，云端成功后自然以云端为准；
     * `titleLocked` 只用于防止「首条消息自动命名」覆盖用户手动改过的名字。
     */
    it('改名成功后标题以云端为准', async () => {
      let remoteTitle = '云端标题';
      const svc2 = withApi({
        fetchChatThreads: async (_a: string, o?: { includeDeleted?: boolean }) =>
          o?.includeDeleted
            ? []
            : [
                { objectId: 'x', agentId: AGENT, roomId: ROOM, threadRoot: '$t', title: remoteTitle, titleLocked: true, messageCount: 1, lastMessageAt: 5, archived: false, lastPreview: '' },
              ],
        upsertChatThreads: async () => undefined,
        patchChatThread: async (i: { title?: string }) => {
          if (i.title) remoteTitle = i.title;
        },
      });
      svc2.adopt({ id: '$t', roomId: ROOM, agentId: AGENT });
      svc2.rename('$t', '我改的标题');
      await svc2.hydrateFromCloud(AGENT);
      expect(svc2.byId('$t')?.title).withContext('云端已更新，应展示新标题').toBe('我改的标题');
    });

    it('归档状态以云端为准', async () => {
      const svc2 = withApi({
        fetchChatThreads: async (_a: string, o?: { includeDeleted?: boolean }) =>
          o?.includeDeleted
            ? []
            : [
          { objectId: 'x', agentId: AGENT, roomId: ROOM, threadRoot: '$a', title: 't', titleLocked: false, messageCount: 1, lastMessageAt: 9, archived: true, lastPreview: '' },
              ],
        upsertChatThreads: async () => undefined,
      });
      svc2.adopt({ id: '$a', roomId: ROOM, agentId: AGENT });
      await svc2.hydrateFromCloud(AGENT);
      expect(svc2.byId('$a')?.archived).toBeTrue();
    });

    it('🔴 云端明确为空 → 本机同容器会话一并清掉（删除后不再复活）', async () => {
      const svc2 = withApi({
        fetchChatThreads: async (_a: string, o?: { includeDeleted?: boolean }) => (o?.includeDeleted ? [] : []),
        upsertChatThreads: async () => undefined,
      });
      svc2.create(ROOM, AGENT);
      await svc2.hydrateFromCloud(AGENT);
      expect(svc2.listFor(AGENT, { includeArchived: true }).length).toBe(0);
    });

    it('云端明确为空时 pushAll 不得把本地会话推回去', async () => {
      const upsert = jasmine.createSpy('upsert').and.returnValue(Promise.resolve());
      const svc2 = withApi({ fetchChatThreads: async (_a: string, o?: { includeDeleted?: boolean }) => (o?.includeDeleted ? [] : []), upsertChatThreads: upsert });
      svc2.create(ROOM, AGENT);           // create 自身会推一次（正常行为）
      await svc2.hydrateFromCloud(AGENT); // 云端为空 → 本地清空
      const callsAfterCreate = upsert.calls.count();
      await svc2.pushAll(AGENT);          // 清空后不应再推
      expect(upsert.calls.count()).toBe(callsAfterCreate);
    });

    /*
     * 🔴 行为变更（2026-11-01 用户裁决）：云端不可达时**列表不可信**。
     *
     * 旧行为「保留本地缓存照常展示」看着更"稳"，实际是两端互相覆盖的根源：
     * 用户看到的可能是几小时前的列表，在上面做的删除/归档又会回写云端。
     */
    it('🔴 云端不可达 → ready=false，界面据此显示「加载失败」', async () => {
      const svc2 = withApi({
        fetchChatThreads: async () => { throw new Error('network'); },
        upsertChatThreads: async () => { throw new Error('network'); },
      });
      await svc2.hydrateFromCloud(AGENT);
      expect(svc2.ready()).toBeFalse();
      expect(svc2.error()).toBe('network');
    });

    it('云端不可达时 pushAll 不推送（列表本身就不可信）', async () => {
      const upsert = jasmine.createSpy('upsert').and.returnValue(Promise.resolve());
      const svc2 = withApi({
        fetchChatThreads: async () => { throw new Error('network'); },
        upsertChatThreads: upsert,
      });
      svc2.create(ROOM, AGENT);
      const before = upsert.calls.count();
      await svc2.hydrateFromCloud(AGENT);
      await svc2.pushAll(AGENT);
      expect(upsert.calls.count()).withContext('云端不可达时不应回写').toBe(before);
    });

    it('云端成功返回后 ready=true', async () => {
      const svc2 = withApi({
        fetchChatThreads: async (_a: string, o?: { includeDeleted?: boolean }) => (o?.includeDeleted ? [] : []),
        upsertChatThreads: async () => undefined,
      });
      expect(svc2.ready()).toBeFalse();
      await svc2.hydrateFromCloud(AGENT);
      expect(svc2.ready()).toBeTrue();
    });

    it('🔴 云端删掉的会话，本地下一次拉取即消失', async () => {
      let live = [
        { objectId: 'a', agentId: AGENT, roomId: ROOM, threadRoot: '$a', title: 'A', titleLocked: false, messageCount: 1, lastMessageAt: 1, archived: false, lastPreview: '' },
        { objectId: 'b', agentId: AGENT, roomId: ROOM, threadRoot: '$b', title: 'B', titleLocked: false, messageCount: 1, lastMessageAt: 2, archived: false, lastPreview: '' },
      ];
      const svc2 = withApi({
        fetchChatThreads: async (_a: string, o?: { includeDeleted?: boolean }) => (o?.includeDeleted ? [] : live),
        upsertChatThreads: async () => undefined,
      });
      await svc2.hydrateFromCloud(AGENT);
      expect(svc2.listFor(AGENT).length).toBe(2);
      live = [live[0]];
      await svc2.hydrateFromCloud(AGENT);
      expect(svc2.listFor(AGENT).map((s) => s.id)).withContext('云端没有的应被移除').toEqual(['$a']);
    });
  });
});