# Room.scene 设计 spec

> **Status:** Draft v1 (brainstorming in progress, awaiting user review)
> **Date:** 2026-09-02
> **Spec for:** `assets/scenes/Room.scene` + `assets/scripts/RoomSceneStart.ts`

## Goal

为 YouleNexus Cocos 工程新建 `Room.scene`，含 4 个默认玩家槽位（可配置 1-8） + 房间号 Label + 准备/退出按钮。RoomSceneStart 脚本暴露可被子游戏调用的 API（setPlayerCount / setSeatLayout / setPlayerData），支持不同子游戏不同房间人数 + 同一游戏多种玩家人数。

**成功标准**：Room.scene 在 Cocos 编辑器加载 0 报错；4 个默认槽位可见；setPlayerCount(2) 后只 2 个可见；setSeatLayout('horizontal') 后位置正确（2x2 / triangle / square 布局坐标留作后续 layout 子任务，与下文「不覆盖」一致）。

## 范围

### 覆盖
- ✅ 新建 `assets/scenes/Room.scene`
- ✅ 新建 `assets/scripts/RoomSceneStart.ts` 脚本 + 公共 API
- ✅ 4-8 个 PlayerInfoView_Runtime 槽位（预制 + active 控制）
- ✅ 房间号 Label + 状态 Label
- ✅ 准备 + 退出按钮
- ✅ 4 种 seat layout：horizontal / 2x2 / triangle / square
- ✅ 测试：RoomSceneStart 单测 + Room.scene 集成测试

### 不覆盖
- ❌ 真实网络（不连真服务器，mock session）
- ❌ 出牌按钮（业务 UI 子游戏各自定义）
- ❌ 房间生命周期（other_join_room / free_room 等事件探针在 RoomEventProbe.ts 中，RoomSceneStart 只展示层）
- ❌ 跨子游戏路由（Room.scene 是展示层，不参与路由）
- ❌ 2x2 / triangle / square layout 的具体坐标实现（仅在 `SeatLayout` 类型与 `setSeatLayout` 校验中列出，后续 layout 子任务补齐；与上方「成功标准」保持一致）

## Architecture

### 场景结构

```
Room_Node (cc.Scene)
├── Camera (cc.Camera)
├── Canvas (cc.Node + cc.UITransform 1600×720 + cc.Widget alignFlags=45 全屏)
│   ├── RoomInfoPanel (cc.Node + UITransform)
│   │   ├── RoomCodeLabel (cc.Label, "房间号: R0001")
│   │   └── RoomStateLabel (cc.Label, "等待中 / 战斗中")
│   ├── PlayerSlots (cc.Node, 锚定 bottom center)
│   │   ├── PlayerSlot_1 (PlayerInfoView_Runtime prefab instance, active=visible)
│   │   ├── PlayerSlot_2 (...)
│   │   ├── ... (8 个预制, 默认 1-4 visible, 5-8 hidden)
│   └── ActionButtons (cc.Node + UITransform)
│       ├── ReadyButton (cc.Button)
│       └── LeaveButton (cc.Button)
└── Room_Node (cc.Node + RoomSceneStart ccclass script)
    └── RoomSceneStart component
```

### 数据流

```
[Game 子游戏初始化]
    ↓ roomScene.setPlayerCount(2) + setSeatLayout('triangle')
[RoomSceneStart] subscribe session.room.players
    ↓ when player state changes
[PlayerInfoView_Runtime] bindTo(playerData)
    ↓
[UI 自动刷新 Label.string / Sprite.spriteFrame]
```

### 模块划分

| 模块 | 职责 |
|---|---|
| `RoomSceneStart.setPlayerCount(n)` | 设置 1-8 显示槽位数（不重建节点，只切 active） |
| `RoomSceneStart.setSeatLayout(layout)` | 按 4 种布局重新计算槽位 _lpos |
| `RoomSceneStart.setPlayerData(seat, data)` | 注入玩家数据到指定座位，触发对应 PlayerInfoView.bindTo |
| `RoomSceneStart.clearSeats()` | 重置所有槽位为占位（清空 Label + 隐藏 Sprite） |
| `PlayerInfoView_Runtime` (现有) | 单玩家 UI 展示（Label.string / Sprite.spriteFrame） |

## 输入契约

### `assets/scenes/Room.scene`
- UTF-8 JSON
- 标准 Cocos 3.8.8 scene schema（含 cc.SceneAsset / cc.Scene / cc.Node / 组件 / CompPrefabInfo / PrefabInfo）

### `PlayerInfoView_Runtime prefab`
- 已存在 `assets/framework/ui/prefabs/views/PlayerInfoView.prefab`
- 含 3 个子节点：NicknameLabel / BeanLabel / AvatarSprite
- 提供 `bindTo(session)` API

### `PlayerState` (复用现有 type)
- `assets/framework/platform/stores/types.ts`
- 字段：playerid, nickname, avatar, bean, roomcard, score, charm, sex, ...

## 输出契约

### `RoomSceneStart` API
```typescript
import { _decorator, Component, Node } from 'cc';

const { ccclass, property } = _decorator;

export type SeatLayout = 'horizontal' | '2x2' | 'triangle' | 'square';

@ccclass('RoomSceneStart')
export class RoomSceneStart extends Component {
  @property([Node])
  playerSlots: Node[] = [];   // 8 个预制 PlayerInfoView_Runtime 实例（场景里挂载）

  private currentCount: number = 4;
  private currentLayout: SeatLayout = 'horizontal';

  start(): void {
    this.setPlayerCount(this.currentCount);
    this.setSeatLayout(this.currentLayout);
  }

  public setPlayerCount(n: number): void {
    if (n < 1 || n > 8) {
      console.error(`[RoomSceneStart] setPlayerCount: n must be 1-8, got ${n}`);
      return;
    }
    this.currentCount = n;
    for (let i = 0; i < this.playerSlots.length; i++) {
      const slot = this.playerSlots[i];
      if (slot) slot.active = (i < n);
    }
  }

  public setSeatLayout(layout: SeatLayout): void {
    this.currentLayout = layout;
    // 按布局计算每个 slot 的 _lpos
    const positions = this.computeLayoutPositions(layout, this.currentCount);
    for (let i = 0; i < this.currentCount && i < positions.length; i++) {
      const slot = this.playerSlots[i];
      if (slot) slot.setPosition(positions[i].x, positions[i].y, 0);
    }
  }

  private computeLayoutPositions(layout: SeatLayout, count: number): Array<{x: number, y: number}> {
    // 4 种布局的位置表（具体坐标按 RoomInfoPanel + ActionButtons 不重叠设计）
    if (layout === 'horizontal') {
      // 水平排列：-spacing*i
      const spacing = 300;
      const startX = -(count - 1) * spacing / 2;
      return Array.from({length: count}, (_, i) => ({ x: startX + i * spacing, y: 0 }));
    }
    // TODO: 2x2 / triangle / square
    return [];
  }

  public setPlayerData(seat: number, data: any): void {
    if (seat < 1 || seat > this.currentCount) {
      console.error(`[RoomSceneStart] setPlayerData: seat ${seat} out of range 1-${this.currentCount}`);
      return;
    }
    const slot = this.playerSlots[seat - 1];
    if (!slot) return;
    const view = slot.getComponent('PlayerInfoView') as any;
    if (view && typeof view.bindTo === 'function') {
      view.bindTo({ player: { state: { value: data } } });
    }
  }

  public clearSeats(): void {
    for (let i = 0; i < this.currentCount; i++) {
      const slot = this.playerSlots[i];
      if (slot) {
        const view = slot.getComponent('PlayerInfoView') as any;
        if (view && typeof view.bindTo === 'function') {
          view.bindTo({ player: { state: { value: { nickname: '占位', bean: 0, avatar: '' } } } });
        }
      }
    }
  }
}
```

## 错误处理（CLAUDE.md 第二准则）

- `setPlayerCount(n)` n ∉ [1, 8] → throw or log + no-op（throw 更明确）
- `setPlayerData(seat, data)` seat ∉ [1, currentCount] → throw
- `playerSlots` 字段未挂载或长度 !== 8 → throw at start()
- 玩家数据缺失字段 → bindTo 已有容错，不需重复处理

## 测试策略（TDD）

### 单测：`framework-tests/ui/room-scene-start.test.mjs`

```javascript
import { test } from 'node:test';
import assert from 'node:assert/strict';
import { setPlayerCount, setSeatLayout, setPlayerData, clearSeats } from '../../assets/scripts/RoomSceneStart.ts';

// Mock Node + PlayerInfoView
function mockSlot() {
  return {
    active: true,
    setPosition: (x, y, z) => {},
    getComponent: (name) => name === 'PlayerInfoView' ? { bindTo: (s) => {} } : null,
  };
}

test('setPlayerCount(2) → 前 2 个 slot active=true, 其余 false', () => {
  const slots = Array.from({length: 8}, mockSlot);
  setPlayerCount(slots, 2);
  assert.equal(slots[0].active, true);
  assert.equal(slots[3].active, false);
});

test('setPlayerCount(0) → throw', () => {
  const slots = Array.from({length: 8}, mockSlot);
  assert.throws(() => setPlayerCount(slots, 0));
});

test('setSeatLayout(horizontal) → 8 玩家水平排列居中', () => {
  // verify positions computed symmetric around 0
});
```

### 集成测试：用 funplay_cocos_mcp 加载 Room.scene

```bash
# 1. 创建 Room.scene 资产 + 挂载脚本
# 2. refresh_assets
# 3. open_asset Room.scene
# 4. validate_prefab_references
# 5. capture_scene_screenshot 看 4 玩家 slot 可见
# 6. 调用 setPlayerCount(2) via execute_javascript → 验证只 2 个 active
```

## Global Constraints

- **服务器零改动** (CLAUDE.md 第一准则)
- **数据源权威唯一、下游不兜底** (第二准则)
- **UTF-8 编码** (Ruling 4 FINAL)
- **node:test + node:assert**; no third-party deps
- **Cocos 3.8.8** + **funplay-cocos-mcp v0.5.1**
- **TypeScript + ESM**（assets/scripts/*.ts 项目惯例）

## PoC 验证路径（实施完成后）

1. funplay_cocos_mcp `open_asset Room.scene` → imported, invalid=false
2. `validate_prefab_references` → 0 missing
3. `capture_scene_screenshot` → 4 个 PlayerInfoView 槽位可见 + RoomInfoPanel 显示"房间号: 占位" + ActionButtons 可见
4. `execute_javascript` 调用 `RoomSceneStart.setPlayerCount(2)` → capture 第二次 → 只 2 个 slot visible

## 残余 follow-up（park）

- ❌ 真实网络（不连真服务器）— 子游戏路由任务
- ❌ 出牌按钮 UI — 各子游戏自行实现
- ❌ 2x2 / triangle / square 布局具体坐标 — 留作 layout 子任务

## Success Metrics

- Room.scene 在 Cocos 编辑器 0 报错
- `setSeatLayout('horizontal')` 函数返回正确位置（对称居中）
- `setSeatLayout('2x2'|'triangle'|'square')` 在 `computePositions` 层校验通过且 throw 行为正确；具体坐标留 layout 子任务
- setPlayerCount(1-8) 全部通过（含非法值 throw：0 / 9 / NaN / 1.5 / 非 number）
- setSeatLayout 仅接受合法 layout 字符串；非法值 throw
- setPlayerData(seat, data) 校验 seat 整数 ∈ [1, currentCount]、data 三字段合法；非法值 throw
- 现有 framework tests 仍 PASS（不回归）
- 新增 RoomSceneStart controller tests 全部 PASS（target ≥ 8 test cases,含 happy path + 所有非法输入）
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