# Calendar Sharing Implementation Plan

> **For Claude:** REQUIRED SUB-SKILL: Use superpowers:executing-plans to implement this plan task-by-task.

**Goal:** 实现日历事件分享功能 - 用户可以分享日历事件给其他人（通过邮箱），被邀请人会收到待办消息，可以同意或忽略邀请。

**Architecture:** 使用现有的 schemas/repository/service/router 分层架构。新增 inbox_messages 模块处理邀请消息。复用 auth gateway 的 get_user_by_email 通过邮箱查找用户。

**Tech Stack:** FastAPI, SQLAlchemy (async), Pydantic, Supabase Auth

---

## Permission Bits (from design doc)

| Permission | Value | Binary |
|------------|-------|--------|
| view       | 1     | 001    |
| invite     | 2     | 010    |
| edit       | 4     | 100    |

- Owner has all permissions: 7 (111)
- Check permission: `permission & 2 == 2` (has invite)
- Add permission: `permission | 2`

---

## Task 1: Add inbox_messages module (schemas, repository, service, router)

**Files:**
- Create: `backend/src/v1/inbox_messages/__init__.py`
- Create: `backend/src/v1/inbox_messages/schemas.py`
- Create: `backend/src/v1/inbox_messages/repository.py`
- Create: `backend/src/v1/inbox_messages/service.py`
- Create: `backend/src/v1/inbox_messages/router.py`
- Modify: `backend/src/v1/router.py` - include inbox_messages router

**Step 1: Write the failing test**

```python
# backend/tests/unit/v1/inbox_messages/test_schemas.py
import pytest
from uuid import uuid4
from v1.inbox_messages.schemas import (
    InboxMessageResponse,
    InboxMessageListRequest,
    InboxMessageAcceptRequest,
)

def test_inbox_message_response_schema():
    msg_id = uuid4()
    response = InboxMessageResponse(
        id=msg_id,
        recipient_id=uuid4(),
        sender_id=uuid4(),
        message_type="calendar",
        schedule_item_id=uuid4(),
        content="Join my calendar",
        is_read=False,
        status="pending",
    )
    assert response.message_type == "calendar"
    assert response.status == "pending"

def test_inbox_message_accept_request_schema():
    request = InboxMessageAcceptRequest(
        permission_view=True,
        permission_edit=False,
        permission_invite=False,
    )
    assert request.permission_view is True
    assert request.permission_edit is False
```

**Step 2: Run test to verify it fails**

Run: `cd backend && uv run pytest tests/unit/v1/inbox_messages/test_schemas.py -v`
Expected: FAIL with "ModuleNotFoundError: No module named 'v1.inbox_messages'"

**Step 3: Write minimal implementation**

Create `backend/src/v1/inbox_messages/__init__.py`:
```python
```

Create `backend/src/v1/inbox_messages/schemas.py`:
```python
from __future__ import annotations

from datetime import datetime
from enum import Enum
from typing import Optional
from uuid import UUID

from pydantic import BaseModel, Field


class InboxMessageType(str, Enum):
    FRIEND_REQUEST = "friend_request"
    CALENDAR = "calendar"
    SYSTEM = "system"
    GROUP = "group"


class InboxMessageStatus(str, Enum):
    PENDING = "pending"
    ACCEPTED = "accepted"
    REJECTED = "rejected"
    DISMISSED = "dismissed"


class InboxMessageResponse(BaseModel):
    id: UUID
    recipient_id: UUID
    sender_id: Optional[UUID] = None
    message_type: InboxMessageType
    schedule_item_id: Optional[UUID] = None
    content: Optional[str] = None
    is_read: bool = False
    status: InboxMessageStatus = InboxMessageStatus.PENDING
    created_at: datetime


class InboxMessageListRequest(BaseModel):
    status: Optional[InboxMessageStatus] = None


class InboxMessageAcceptRequest(BaseModel):
    permission_view: bool = True
    permission_edit: bool = False
    permission_invite: bool = False
```

Create `backend/src/v1/inbox_messages/repository.py`:
```python
from __future__ import annotations

from typing import Optional
from uuid import UUID

from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from models.inbox_messages import InboxMessage, InboxMessageStatus


class InboxMessageRepository:
    def __init__(self, session: AsyncSession) -> None:
        self._session = session

    async def create(self, data: dict) -> InboxMessage:
        msg = InboxMessage(**data)
        self._session.add(msg)
        await self._session.flush()
        return msg

    async def get_by_id(self, message_id: UUID, recipient_id: UUID) -> Optional[InboxMessage]:
        result = await self._session.execute(
            select(InboxMessage).where(
                InboxMessage.id == message_id,
                InboxMessage.recipient_id == recipient_id,
            )
        )
        return result.scalar_one_or_none()

    async def list_by_recipient(
        self, recipient_id: UUID, status: Optional[InboxMessageStatus] = None
    ) -> list[InboxMessage]:
        query = select(InboxMessage).where(InboxMessage.recipient_id == recipient_id)
        if status:
            query = query.where(InboxMessage.status == status)
        query = query.order_by(InboxMessage.created_at.desc())
        result = await self._session.execute(query)
        return list(result.scalars().all())

    async def update_status(
        self, message_id: UUID, recipient_id: UUID, status: InboxMessageStatus
    ) -> Optional[InboxMessage]:
        msg = await self.get_by_id(message_id, recipient_id)
        if msg:
            msg.status = status
            await self._session.flush()
        return msg
```

Create `backend/src/v1/inbox_messages/service.py`:
```python
from __future__ import annotations

from typing import TYPE_CHECKING, Optional
from uuid import UUID

from fastapi import HTTPException
from sqlalchemy.exc import SQLAlchemyError

from core.auth.models import CurrentUser
from core.db.base_service import BaseService
from core.logging import get_logger
from models.inbox_messages import InboxMessageStatus
from v1.inbox_messages.repository import InboxMessageRepository
from v1.inbox_messages.schemas import (
    InboxMessageAcceptRequest,
    InboxMessageListRequest,
    InboxMessageResponse,
)

if TYPE_CHECKING:
    from sqlalchemy.ext.asyncio import AsyncSession

logger = get_logger("v1.inbox_messages.service")


class InboxMessageService(BaseService):
    _repository: InboxMessageRepository
    _session: AsyncSession

    def __init__(
        self,
        repository: InboxMessageRepository,
        session: AsyncSession,
        current_user: Optional[CurrentUser] = None,
    ) -> None:
        super().__init__(current_user=current_user)
        self._repository = repository
        self._session = session

    async def list_messages(
        self, request: InboxMessageListRequest
    ) -> list[InboxMessageResponse]:
        user_id = self.require_user_id()

        try:
            messages = await self._repository.list_by_recipient(
                user_id, request.status
            )
        except SQLAlchemyError:
            logger.exception("Failed to list inbox messages")
            raise HTTPException(status_code=503, detail="Inbox unavailable")

        return [
            InboxMessageResponse(
                id=m.id,
                recipient_id=m.recipient_id,
                sender_id=m.sender_id,
                message_type=m.message_type,
                schedule_item_id=m.schedule_item_id,
                content=m.content,
                is_read=m.is_read,
                status=m.status,
                created_at=m.created_at,
            )
            for m in messages
        ]

    async def accept_invitation(
        self, message_id: UUID, request: InboxMessageAcceptRequest
    ) -> None:
        user_id = self.require_user_id()

        try:
            message = await self._repository.get_by_id(message_id, user_id)
        except SQLAlchemyError:
            logger.exception("Failed to get inbox message", message_id=str(message_id))
            raise HTTPException(status_code=503, detail="Inbox unavailable")

        if message is None:
            raise HTTPException(status_code=404, detail="Message not found")

        if message.message_type != InboxMessageStatus.PENDING:
            raise HTTPException(status_code=400, detail="Message already processed")

        message.status = InboxMessageStatus.ACCEPTED
        await self._session.flush()
        await self._session.commit()

    async def dismiss_invitation(self, message_id: UUID) -> None:
        user_id = self.require_user_id()

        try:
            message = await self._repository.get_by_id(message_id, user_id)
        except SQLAlchemyError:
            logger.exception("Failed to get inbox message", message_id=str(message_id))
            raise HTTPException(status_code=503, detail="Inbox unavailable")

        if message is None:
            raise HTTPException(status_code=404, detail="Message not found")

        message.status = InboxMessageStatus.DISMISSED
        await self._session.flush()
        await self._session.commit()
```

Create `backend/src/v1/inbox_messages/dependencies.py`:
```python
from typing import Annotated

from fastapi import Depends
from sqlalchemy.ext.asyncio import AsyncSession

from core.auth.dependencies import get_current_user
from core.db.session import get_db
from models.auth.models import CurrentUser
from v1.inbox_messages.repository import InboxMessageRepository
from v1.inbox_messages.service import InboxMessageService


def get_inbox_message_repository(
    session: Annotated[AsyncSession, Depends(get_db)]
) -> InboxMessageRepository:
    return InboxMessageRepository(session)


def get_inbox_message_service(
    repository: Annotated[InboxMessageRepository, Depends(get_inbox_message_repository)],
    current_user: Annotated[CurrentUser | None, Depends(get_current_user)],
) -> InboxMessageService:
    return InboxMessageService(
        repository=repository,
        session=repository._session,
        current_user=current_user,
    )
```

Create `backend/src/v1/inbox_messages/router.py`:
```python
from __future__ import annotations

from typing import Annotated
from uuid import UUID

from fastapi import APIRouter, Depends, Query

from v1.inbox_messages.dependencies import get_inbox_message_service
from v1.inbox_messages.schemas import (
    InboxMessageAcceptRequest,
    InboxMessageListRequest,
    InboxMessageResponse,
    InboxMessageStatus,
)
from v1.inbox_messages.service import InboxMessageService


router = APIRouter(prefix="/inbox", tags=["inbox"])


@router.get("/messages", response_model=list[InboxMessageResponse])
async def list_inbox_messages(
    service: Annotated[InboxMessageService, Depends(get_inbox_message_service)],
    status: InboxMessageStatus | None = Query(None, description="Filter by status"),
) -> list[InboxMessageResponse]:
    request = InboxMessageListRequest(status=status)
    return await service.list_messages(request)


@router.post("/messages/{message_id}/accept", status_code=204)
async def accept_invitation(
    message_id: UUID,
    request: InboxMessageAcceptRequest,
    service: Annotated[InboxMessageService, Depends(get_inbox_message_service)],
) -> None:
    await service.accept_invitation(message_id, request)


@router.post("/messages/{message_id}/dismiss", status_code=204)
async def dismiss_invitation(
    message_id: UUID,
    service: Annotated[InboxMessageService, Depends(get_inbox_message_service)],
) -> None:
    await service.dismiss_invitation(message_id)
```

Modify `backend/src/v1/router.py`:
```python
from fastapi import APIRouter

from core.http.models import HealthResponse
from v1.agent_chat.router import router as agent_chat_router
from v1.auth.router import router as auth_router
from v1.infra.router import router as infra_router
from v1.inbox_messages.router import router as inbox_messages_router
from v1.schedule_items.router import router as schedule_items_router
from v1.users.router import router as users_router


router = APIRouter(prefix="/api/v1")
router.include_router(auth_router)
router.include_router(infra_router)
router.include_router(users_router)
router.include_router(agent_chat_router)
router.include_router(schedule_items_router)
router.include_router(inbox_messages_router)


@router.get("/health", response_model=HealthResponse)
async def health() -> HealthResponse:
    return HealthResponse(status="ok")
```

**Step 4: Run test to verify it passes**

Run: `cd backend && uv run pytest tests/unit/v1/inbox_messages/test_schemas.py -v`
Expected: PASS

**Step 5: Commit**

```bash
git add backend/src/v1/inbox_messages/ backend/src/v1/router.py
git commit -m "feat: add inbox messages module for calendar invitations"
```

---

## Task 2: Add share calendar API to schedule_items

**Files:**
- Modify: `backend/src/v1/schedule_items/schemas.py` - add share schemas
- Modify: `backend/src/v1/schedule_items/repository.py` - add subscription create
- Modify: `backend/src/v1/schedule_items/service.py` - add share method
- Modify: `backend/src/v1/schedule_items/router.py` - add share endpoint
- Modify: `backend/src/v1/schedule_items/dependencies.py` - add dependencies

**Step 1: Write the failing test**

```python
# backend/tests/unit/v1/schedule_items/test_share.py
import pytest
from uuid import uuid4
from v1.schedule_items.schemas import ScheduleItemShareRequest

def test_share_request_schema():
    request = ScheduleItemShareRequest(
        email="friend@example.com",
        permission_view=True,
        permission_edit=True,
        permission_invite=False,
    )
    assert request.email == "friend@example.com"
    assert request.permission_view is True

def test_permission_bits_calculation():
    request = ScheduleItemShareRequest(
        email="friend@example.com",
        permission_view=True,
        permission_edit=True,
        permission_invite=False,
    )
    # view=1, edit=4, invite=0 -> 1|4 = 5
    assert request._permission_value() == 5
```

**Step 2: Run test to verify it fails**

Run: `cd backend && uv run pytest tests/unit/v1/schedule_items/test_share.py -v`
Expected: FAIL with "cannot import 'ScheduleItemShareRequest'"

**Step 3: Write minimal implementation**

Add to `backend/src/v1/schedule_items/schemas.py`:
```python
class ScheduleItemShareRequest(BaseModel):
    email: str = Field(..., description="Email of user to share with")
    permission_view: bool = Field(True, description="Grant view permission")
    permission_edit: bool = Field(False, description="Grant edit permission")
    permission_invite: bool = Field(False, description="Grant invite permission")

    def _permission_value(self) -> int:
        value = 0
        if self.permission_view:
            value |= 1  # 001
        if self.permission_edit:
            value |= 4  # 100
        if self.permission_invite:
            value |= 2  # 010
        return value


class ScheduleItemShareResponse(BaseModel):
    message: str
```

Add to `backend/src/v1/schedule_items/repository.py`:
```python
from models.schedule_subscriptions import ScheduleSubscription


class ScheduleItemRepository:
    # ... existing code ...

    async def create_subscription(self, data: dict) -> ScheduleSubscription:
        sub = ScheduleSubscription(**data)
        self._session.add(sub)
        await self._session.flush()
        return sub
```

Add to `backend/src/v1/schedule_items/service.py`:
```python
from uuid import UUID

from core.auth.models import CurrentUser
from v1.auth.gateway import SupabaseAuthGateway
from models.schedule_subscriptions import ScheduleSubscription


class ScheduleItemService:
    # ... existing code ...

    async def share(
        self, item_id: UUID, request: ScheduleItemShareRequest
    ) -> ScheduleItemShareResponse:
        user_id = self.require_user_id()

        # Check item exists and user is owner
        try:
            item = await self._repository.get_by_item_id(item_id, user_id)
        except SQLAlchemyError:
            logger.exception("Failed to get schedule item", item_id=str(item_id))
            raise HTTPException(status_code=503, detail="Schedule item store unavailable")

        if item is None:
            raise HTTPException(status_code=404, detail="Schedule item not found")

        if item.owner_id != user_id:
            raise HTTPException(status_code=403, detail="Only owner can share")

        # Lookup user by email
        auth_gateway = SupabaseAuthGateway()
        try:
            target_user = await auth_gateway.get_user_by_email(request.email)
        except HTTPException as exc:
            if exc.status_code == 404:
                raise HTTPException(status_code=404, detail="User not found")
            raise

        target_user_id = UUID(target_user.id)

        # Create inbox message
        from models.inbox_messages import InboxMessage, InboxMessageType
        inbox_data = {
            "recipient_id": target_user_id,
            "sender_id": user_id,
            "message_type": InboxMessageType.CALENDAR,
            "schedule_item_id": item_id,
            "content": f"{item.title} shared with you",
            "created_by": user_id,
        }
        try:
            inbox_msg = InboxMessage(**inbox_data)
            self._session.add(inbox_msg)
            await self._session.flush()
        except SQLAlchemyError:
            logger.exception("Failed to create inbox message")
            raise HTTPException(status_code=503, detail="Failed to send invitation")

        await self._session.commit()
        return ScheduleItemShareResponse(
            message=f"Invitation sent to {request.email}"
        )
```

Add to `backend/src/v1/schedule_items/router.py`:
```python
from v1.schedule_items.schemas import (
    ScheduleItemCreateRequest,
    ScheduleItemListItem,
    ScheduleItemListRequest,
    ScheduleItemResponse,
    ScheduleItemShareRequest,
    ScheduleItemShareResponse,
    ScheduleItemUpdateRequest,
)


@router.post("/{item_id}/share", response_model=ScheduleItemShareResponse)
async def share_schedule_item(
    item_id: UUID,
    request: ScheduleItemShareRequest,
    service: Annotated[ScheduleItemService, Depends(get_schedule_item_service)],
) -> ScheduleItemShareResponse:
    return await service.share(item_id, request)
```

**Step 4: Run test to verify it passes**

Run: `cd backend && uv run pytest tests/unit/v1/schedule_items/test_share.py -v`
Expected: PASS

**Step 5: Commit**

```bash
git add backend/src/v1/schedule_items/
git commit -m "feat: add share calendar API"
```

---

## Task 3: Add accept invitation - create subscription

**Files:**
- Modify: `backend/src/v1/inbox_messages/service.py` - add subscription creation on accept

**Step 1: Write the failing test**

```python
# backend/tests/unit/v1/inbox_messages/test_accept_invitation.py
import pytest
from unittest.mock import AsyncMock, MagicMock
from uuid import uuid4
from v1.inbox_messages.service import InboxMessageService

@pytest.mark.asyncio
async def test_accept_creates_subscription():
    # Setup mocks
    mock_repo = MagicMock()
    mock_session = MagicMock()
    mock_message = MagicMock()
    mock_message.id = uuid4()
    mock_message.message_type = "calendar"
    mock_message.status = "pending"
    mock_message.schedule_item_id = uuid4()
    mock_repo.get_by_id = AsyncMock(return_value=mock_message)
    mock_repo._session = mock_session
    
    service = InboxMessageService(
        repository=mock_repo,
        session=mock_session,
        current_user=MagicMock(user_id=uuid4()),
    )
    
    # This should be implemented
    await service.accept_invitation(mock_message.id, ...)
```

**Step 2: Run test to verify it fails**

Expected: FAIL (test will fail because accept doesn't create subscription yet)

**Step 3: Write implementation**

Modify `backend/src/v1/inbox_messages/service.py` to import ScheduleSubscriptionRepository and create subscription on accept.

**Step 4: Run test to verify it passes**

Run tests and verify pass.

**Step 5: Commit**

---

## Task 4: Fix permission enum reference bug

**Files:**
- Modify: `backend/src/v1/inbox_messages/service.py` - fix InboxMessageStatus reference

**Bug:** In Task 1, we used `InboxMessageStatus.PENDING` but should check against the actual enum type. Fix the bug.

**Step 1: Write test to verify bug**

```python
def test_accept_checks_message_type_not_status():
    # Current code incorrectly checks message_type == PENDING
    # Should check status == PENDING
```

**Step 2: Fix the implementation**

---

## Task 5: Write unit tests

**Files:**
- Create: `backend/tests/unit/v1/inbox_messages/test_service.py`
- Create: `backend/tests/unit/v1/schedule_items/test_share.py`

---

## Task 6: Write integration tests

**Files:**
- Create: `backend/tests/integration/test_inbox_messages_routes.py`
- Create: `backend/tests/integration/test_schedule_share_routes.py`

---

## Task 7: Update API documentation

**Files:**
- Modify: `docs/runtime/runtime-route.md` - add share/inbox endpoints

---

## Task 8: Run all tests and fix issues

Run full test suite and fix any issues.

---

## Task 9: Run lint and typecheck

Run:
```bash
cd backend && uv run ruff check src/v1/schedule_items/ src/v1/inbox_messages/
cd backend && uv run basedpyright src/v1/schedule_items/ src/v1/inbox_messages/
```

---

## Task 10: Final commit and create PR

```bash
git add .
git commit -m "feat: add calendar sharing with invitations"
git push -u origin feature-calendar-sharing
gh pr create --title "feat: add calendar sharing" --body "..."
```