# Calendar Permission Refactoring Plan

> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.

**Goal:** 统一权限判断逻辑，将 `is_owner` 和 `permission` 的双重判断合并为纯 `permission` 判断，并新增 Owner 徽章 UI。

**Architecture:** 
- 后端：扩展权限位掩码，添加 DELETE=8，OWNER=15。简化 Repository 和 Service 层的重复方法。
- 前端：Model 层 `canEdit`/`canDelete` 改为纯 permission 判断，`isOwner` 仅保留用于 UI 徽章显示。
- Protocol：更新位掩码说明文档。

**Tech Stack:** Python (FastAPI/SQLAlchemy), Flutter, Supabase

---

## 变更范围总结

### 后端 (5 个文件)

| 文件 | 改动 |
|------|------|
| `backend/src/schemas/enums.py` | `DELETE=8`, `OWNER=15` |
| `backend/src/v1/schedule_items/service.py` | 移除双重判断，统一 permission 逻辑 |
| `backend/src/v1/schedule_items/repository.py` | 合并 `get_by_item_id` + `update_by_item_id` → 统一方法 |
| `backend/tests/integration/test_schedule_items_routes.py` | `permission=7` → `permission=15` |
| `docs/protocols/calendar/schedule-items.md` | 更新位掩码说明 |

### 前端 (4 个文件)

| 文件 | 改动 |
|------|------|
| `apps/lib/features/calendar/data/models/schedule_item_model.dart` | `canEdit/canDelete` 改为纯 permission |
| `apps/lib/features/calendar/presentation/screens/calendar_event_detail_screen.dart` | 添加 Owner 徽章 |
| `apps/lib/l10n/app_zh.arb` | 新增 owner badge 文案 |
| `apps/lib/l10n/app_en.arb` | 新增 owner badge 文案 |

---

## Task 1: 后端 - 更新权限枚举

**Files:**
- Modify: `backend/src/schemas/enums.py:96-100`

- [ ] **Step 1: 更新 SubscriptionPermission 枚举**

```python
class SubscriptionPermission(int, Enum):
    VIEW = 1
    INVITE = 2
    EDIT = 4
    DELETE = 8
    OWNER = 15  # VIEW | INVITE | EDIT | DELETE
```

- [ ] **Step 2: 运行语法检查**

```bash
cd /Users/zl-q/Code/social-app/backend && uv run python -m py_compile src/schemas/enums.py
```

Expected: 无错误输出

---

## Task 2: 后端 - 简化 Repository 层

**Files:**
- Modify: `backend/src/v1/schedule_items/repository.py`

**原始方法 (需合并/删除):**
- `get_by_item_id(item_id, owner_id)` - 仅用于 owner 判断，可删除
- `update_by_item_id(item_id, owner_id, data)` - 仅用于 owner 更新，可删除
- `update_item_by_id(item_id, data)` - 保留，订阅者更新用

**新逻辑:**
- `get_item(item_id)` - 获取 item，不带 owner 过滤
- `update_item(item_id, data)` - 统一更新，不带 owner 过滤（权限判断移至 Service 层）
- `delete_item(item_id)` - 统一删除，不带 owner 过滤（权限判断移至 Service 层）

- [ ] **Step 1: 添加统一方法**

在 `SQLAlchemyScheduleItemRepository` 类中添加：

```python
async def get_item(self, item_id: UUID) -> ScheduleItem | None:
    """Get item by id without owner filter. Permission check done at service layer."""
    try:
        stmt = (
            select(ScheduleItem)
            .where(ScheduleItem.id == item_id)
            .where(ScheduleItem.deleted_at.is_(None))
        )
        result = await self._session.execute(stmt)
        return result.scalar_one_or_none()
    except SQLAlchemyError:
        logger.exception("Schedule item lookup failed", item_id=str(item_id))
        raise

async def update_item(self, item_id: UUID, data: dict) -> ScheduleItem | None:
    """Update item by id without owner filter. Permission check done at service layer."""
    if not data:
        return await self.get_item(item_id)
    try:
        existing = await self.get_item(item_id)
        if existing is None:
            return None
        stmt = (
            update(ScheduleItem)
            .where(ScheduleItem.id == item_id)
            .where(ScheduleItem.deleted_at.is_(None))
            .values(**data)
            .returning(ScheduleItem)
        )
        result = await self._session.execute(stmt)
        await self._session.flush()
        return result.scalar_one_or_none()
    except SQLAlchemyError:
        logger.exception("Schedule item update failed", item_id=str(item_id))
        raise

async def delete_item(self, item_id: UUID) -> ScheduleItem | None:
    """Soft delete item by id without owner filter. Permission check done at service layer."""
    try:
        stmt = (
            update(ScheduleItem)
            .where(ScheduleItem.id == item_id)
            .where(ScheduleItem.deleted_at.is_(None))
            .values(deleted_at=datetime.now(timezone.utc))
            .returning(ScheduleItem)
        )
        result = await self._session.execute(stmt)
        await self._session.flush()
        return result.scalar_one_or_none()
    except SQLAlchemyError:
        logger.exception("Schedule item delete failed", item_id=str(item_id))
        raise
```

- [ ] **Step 2: 更新 Repository Protocol**

修改 `ScheduleItemRepository` Protocol 定义：

```python
class ScheduleItemRepository(Protocol):
    async def get_by_id(self, entity_id: UUID) -> ScheduleItem | None: ...
    async def get_item(self, item_id: UUID) -> ScheduleItem | None: ...  # 新增
    async def get_subscription(self, item_id: UUID, subscriber_id: UUID) -> ScheduleSubscription | None: ...
    async def create(self, data: dict) -> ScheduleItem: ...
    async def update_item(self, item_id: UUID, data: dict) -> ScheduleItem | None: ...  # 合并
    async def delete_item(self, item_id: UUID) -> ScheduleItem | None: ...  # 合并
    # ... 其他方法保持不变
```

- [ ] **Step 3: 运行语法检查**

```bash
cd /Users/zl-q/Code/social-app/backend && uv run python -m py_compile src/v1/schedule_items/repository.py
```

Expected: 无错误输出

---

## Task 3: 后端 - 简化 Service 层

**Files:**
- Modify: `backend/src/v1/schedule_items/service.py`

### 3.1 get_by_id 方法简化

**原始逻辑 (lines 175-180):**
```python
is_owner = item.owner_id == user_id
permission = 1
if not is_owner:
    subscription = await self._repository.get_subscription(item_id, user_id)
    if subscription:
        permission = subscription.permission
```

**新逻辑:**
```python
subscription = await self._repository.get_subscription(item_id, user_id)
permission = subscription.permission if subscription else 1
is_owner = item.owner_id == user_id
```

### 3.2 update 方法简化

**原始逻辑 (lines 231-264):**
```python
existing = await self._repository.get_by_item_id(item_id, user_id)
is_owner = existing is not None

if not is_owner:
    subscription = await self._repository.get_subscription(item_id, user_id)
    if subscription is None or subscription.status != SubscriptionStatus.ACTIVE:
        raise 404
    if not (subscription.permission & SubscriptionPermission.EDIT):
        raise 403
    existing = await self._repository.get_by_id(item_id)
    ...
# owner 用 update_by_item_id，订阅者用 update_item_by_id
if is_owner:
    item = await self._repository.update_by_item_id(item_id, user_id, update_data)
else:
    item = await self._repository.update_item_by_id(item_id, update_data)
```

**新逻辑:**
```python
subscription = await self._repository.get_subscription(item_id, user_id)
if subscription is None or subscription.status != SubscriptionStatus.ACTIVE:
    raise 404
if not (subscription.permission & SubscriptionPermission.EDIT):
    raise 403
# 统一用 update_item
item = await self._repository.update_item(item_id, update_data)
is_owner = item.owner_id == user_id if item else False
```

### 3.3 delete 方法简化

**原始逻辑 (lines 338-366):**
```python
existing = await self._repository.get_by_item_id(item_id, user_id)
if existing is None:
    raise 404
...
await self._repository.delete_by_item_id(item_id, user_id)
```

**新逻辑:**
```python
subscription = await self._repository.get_subscription(item_id, user_id)
if subscription is None or not (subscription.permission & SubscriptionPermission.DELETE):
    raise 403
item = await self._repository.delete_item(item_id)
if item is None:
    raise 404
```

- [ ] **Step 1: 修改 get_by_id (lines 175-180)**

```python
# 替换为:
subscription = await self._repository.get_subscription(item_id, user_id)
permission = subscription.permission if subscription else 1
is_owner = item.owner_id == user_id
```

- [ ] **Step 2: 修改 update 方法 (lines 226-336)**

简化权限检查逻辑，统一使用 `update_item` 方法

- [ ] **Step 3: 修改 delete 方法 (lines 338-366)**

简化权限检查逻辑，统一使用 `delete_item` 方法

- [ ] **Step 4: 更新 _to_response 响应方法 (line 645)**

```python
# 原来
permission=permission if not is_owner else 7,
# 改为 (如果 subscription 有值就用其 permission，否则默认 1)
permission=subscription.permission if subscription else 1,
```

- [ ] **Step 5: 运行语法检查**

```bash
cd /Users/zl-q/Code/social-app/backend && uv run python -m py_compile src/v1/schedule_items/service.py
```

Expected: 无错误输出

---

## Task 4: 后端 - 更新测试

**Files:**
- Modify: `backend/tests/integration/test_schedule_items_routes.py`

- [ ] **Step 1: 更新所有 permission=7 为 permission=15**

```bash
# 使用 replaceAll 功能
# 将 permission=7 替换为 permission=15
```

- [ ] **Step 2: 运行测试验证**

```bash
cd /Users/zl-q/Code/social-app/backend && uv run pytest tests/integration/test_schedule_items_routes.py -v
```

Expected: 所有测试通过

---

## Task 5: 前端 - 简化 Model 权限判断

**Files:**
- Modify: `apps/lib/features/calendar/data/models/schedule_item_model.dart`

- [ ] **Step 1: 添加 DELETE 权限常量**

```dart
static const int permissionDelete = 8;
```

- [ ] **Step 2: 修改 canEdit/canDelete**

```dart
// 原来
bool get canEdit => isOwner || (permission & permissionEdit) != 0;
bool get canDelete => isOwner;

// 改为
bool get canEdit => (permission & permissionEdit) != 0;
bool get canDelete => (permission & permissionDelete) != 0;
```

- [ ] **Step 3: 运行 flutter analyze**

```bash
cd /Users/zl-q/Code/social-app/apps && flutter analyze lib/features/calendar/data/models/schedule_item_model.dart
```

Expected: No issues found

---

## Task 6: 前端 - 添加 Owner 徽章

**Files:**
- Modify: `apps/lib/features/calendar/presentation/screens/calendar_event_detail_screen.dart`

- [ ] **Step 1: 在标题栏添加 Owner 徽章**

找到标题显示的位置（约 line 250-280），在标题后添加：

```dart
if (event.isOwner)
  Container(
    margin: const EdgeInsets.only(left: 8),
    padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
    decoration: BoxDecoration(
      color: Theme.of(context).colorScheme.primaryContainer,
      borderRadius: BorderRadius.circular(4),
    ),
    child: Text(
      context.l10n.calendarOwnerBadge,
      style: TextStyle(
        fontSize: 12,
        color: Theme.of(context).colorScheme.onPrimaryContainer,
      ),
    ),
  ),
```

- [ ] **Step 2: 运行 flutter analyze**

```bash
cd /Users/zl-q/Code/social-app/apps && flutter analyze lib/features/calendar/presentation/screens/calendar_event_detail_screen.dart
```

Expected: No issues found

---

## Task 7: 前端 - 添加 L10n 文案

**Files:**
- Modify: `apps/lib/l10n/app_zh.arb`
- Modify: `apps/lib/l10n/app_en.arb`

- [ ] **Step 1: 添加中文文案**

在 `app_zh.arb` 末尾添加：

```json
"calendarOwnerBadge": "我的日历",
"@calendarOwnerBadge": {
  "description": "Owner badge shown when user owns the calendar"
}
```

- [ ] **Step 2: 添加英文文案**

在 `app_en.arb` 末尾添加：

```json
"calendarOwnerBadge": "My Calendar",
"@calendarOwnerBadge": {
  "description": "Owner badge shown when user owns the calendar"
}
```

- [ ] **Step 3: 生成 l10n**

```bash
cd /Users/zl-q/Code/social-app/apps && flutter gen-l10n
```

---

## Task 8: 更新 Protocol 文档

**Files:**
- Modify: `docs/protocols/calendar/schedule-items.md`

- [ ] **Step 1: 更新 SubscriberInfo 的 permission 说明**

找到 SubscriberInfo 部分，添加 DELETE 权限说明：

```
permission: "int (位掩码: 1=view, 2=invite, 4=edit, 8=delete)"
```

- [ ] **Step 2: 更新 PATCH `/{item_id}` 的 Authorization 说明**

```
- **Owner**: 可更新所有字段 (permission=15)
- **Subscriber (DELETE permission)**: 可删除日程（权限位掩码包含 `8`）
```

---

## Task 9: 最终验证

- [ ] **Step 1: 后端语法检查**

```bash
cd /Users/zl-q/Code/social-app/backend && uv run python -m py_compile src/schemas/enums.py src/v1/schedule_items/repository.py src/v1/schedule_items/service.py
```

- [ ] **Step 2: 后端测试**

```bash
cd /Users/zl-q/Code/social-app/backend && uv run pytest tests/integration/test_schedule_items_routes.py -v
```

- [ ] **Step 3: 前端分析**

```bash
cd /Users/zl-q/Code/social-app/apps && flutter analyze lib/features/calendar
```

- [ ] **Step 4: Git 状态检查**

```bash
cd /Users/zl-q/Code/social-app && git status
```

---

## 回滚计划

如果出现问题：

1. **后端回滚**: `git checkout HEAD~1 -- backend/`
2. **前端回滚**: `git checkout HEAD~1 -- apps/`
3. **Protocol 回滚**: `git checkout HEAD~1 -- docs/`

---

## 注意事项

1. Repository 层的方法合并后，Service 层必须确保权限判断正确
2. Owner 创建日程时，subscription.permission 应该设置为 15 (OWNER)
3. 测试中的 permission=7 需要全部更新为 15
4. 前端 isOwner 字段仍保留，但仅用于 UI 显示，不参与权限判断