"""好友路由"""

from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.ext.asyncio import AsyncSession

from app.dependencies import get_db, get_current_user
from app.models.user import User
from app.schemas.friend import FriendRequestCreate, FriendRead, FriendRequestRead, RemarkUpdate
from app.services.friend_service import FriendService
from app.websocket.events import EventType
from app.websocket.manager import manager

router = APIRouter()


@router.get("/", response_model=list[dict])
async def list_friends(
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """获取好友列表"""
    service = FriendService(db)
    return await service.get_friends(user.id)


@router.get("/requests", response_model=list[dict])
async def list_requests(
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """获取待处理的好友请求"""
    service = FriendService(db)
    return await service.get_pending_requests(user.id)


@router.post("/request")
async def send_friend_request(
    req: FriendRequestCreate,
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """发送好友请求"""
    service = FriendService(db)
    try:
        await service.send_request(user.id, req.to_user_id, req.message)
        # 通知接收者
        await manager.send_to_user(req.to_user_id, EventType.FRIEND_REQUEST, {
            "from_user_id": user.id,
            "from_username": user.username,
            "from_nickname": user.nickname,
            "from_avatar": user.avatar_url,
            "message": req.message,
        })
        return {"success": True, "message": "好友请求已发送"}
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))


@router.put("/{friend_user_id}/remark")
async def update_friend_remark(
    friend_user_id: str,
    req: RemarkUpdate,
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """修改好友备注"""
    service = FriendService(db)
    try:
        await service.update_remark(user.id, friend_user_id, req.remark)
        return {"success": True, "message": "备注已更新"}
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))


@router.put("/request/{request_id}/accept")
async def accept_friend_request(
    request_id: str,
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """接受好友请求"""
    service = FriendService(db)
    try:
        # Get request details before accepting to know who sent it
        request = await service.get_pending_requests(user.id)
        from_user_id = None
        for r in request:
            if r["id"] == request_id:
                from_user_id = r["from_user_id"]
                break

        await service.accept_request(request_id, user.id)

        # Notify the requester that their request was accepted
        if from_user_id:
            await manager.send_to_user(from_user_id, EventType.FRIEND_ACCEPTED, {
                "accepted_by_user_id": user.id,
                "accepted_by_username": user.username,
                "accepted_by_nickname": user.nickname,
            })

        return {"success": True, "message": "已添加好友"}
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))


@router.put("/request/{request_id}/reject")
async def reject_friend_request(
    request_id: str,
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """拒绝好友请求"""
    service = FriendService(db)
    try:
        await service.reject_request(request_id, user.id)
        return {"success": True, "message": "已拒绝"}
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))


@router.delete("/{friend_id}")
async def remove_friend(
    friend_id: str,
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """删除好友"""
    service = FriendService(db)
    await service.remove_friend(user.id, friend_id)
    return {"success": True, "message": "已删除好友"}


# ============ 好友分组/标签 ============

@router.get("/tags/list")
async def list_tags(
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """获取我的好友标签"""
    from app.models.friend_tag import FriendTag
    result = await db.execute(
        select(FriendTag).where(FriendTag.user_id == user.id).order_by(FriendTag.created_at)
    )
    return [{"id": t.id, "name": t.name} for t in result.scalars().all()]


@router.post("/tags/create")
async def create_tag(
    body: dict,
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """创建好友标签"""
    from app.models.friend_tag import FriendTag
    import uuid
    tag = FriendTag(id=str(uuid.uuid4()), user_id=user.id, name=body.get("name", "")[:30])
    db.add(tag)
    await db.flush()
    return {"id": tag.id, "name": tag.name}


@router.delete("/tags/{tag_id}")
async def delete_tag(
    tag_id: str,
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """删除好友标签"""
    from app.models.friend_tag import FriendTag
    from sqlalchemy import delete as sql_delete
    await db.execute(sql_delete(FriendTag).where(FriendTag.id == tag_id, FriendTag.user_id == user.id))
    return {"success": True}


@router.put("/{friend_id}/tags")
async def assign_tags(
    friend_id: str,
    body: dict,
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """给好友分配标签（覆盖式）"""
    from app.models.friend_tag import FriendTag, FriendTagAssignment
    from app.models.friend import Friend
    from sqlalchemy import delete as sql_delete
    # 找到该好友关系记录
    fr = await db.execute(
        select(Friend).where(Friend.user_id == user.id, Friend.friend_user_id == friend_id)
    )
    friendship = fr.scalars().first()
    if not friendship:
        raise HTTPException(status_code=404, detail="好友不存在")
    # 清空旧分配
    await db.execute(
        sql_delete(FriendTagAssignment).where(FriendTagAssignment.friend_id == friendship.id)
    )
    # 新分配
    tag_ids = body.get("tag_ids", [])
    import uuid
    for tid in tag_ids:
        db.add(FriendTagAssignment(id=str(uuid.uuid4()), friend_id=friendship.id, tag_id=tid))
    return {"success": True}