from fastapi import APIRouter, Depends, HTTPException, Header
from jose import JWTError, jwt
from sqlalchemy import func
from sqlalchemy.orm import Session

from app.config import JWT_ALGORITHM, JWT_SECRET_KEY
from app.database import get_db
from app.models.joke import Joke
from app.models.category import JokeCrowd, JokeType
from app.models.user import AdminUser
from app.schemas.category import JokeCrowdCreate, JokeCrowdResponse, JokeTypeCreate, JokeTypeResponse
from app.schemas.joke import JokeCreate, JokeResponse, JokeUpdate, PaginatedJokeResponse

router = APIRouter(prefix="/admin", tags=["管理后台"])


def get_current_admin_user(
    authorization: str = Header(None),
    db: Session = Depends(get_db),
) -> AdminUser:
    """Dependency to get current authenticated admin user."""
    if not authorization:
        raise HTTPException(status_code=401, detail="未提供认证令牌")
    parts = authorization.split()
    if len(parts) != 2 or parts[0].lower() != "bearer":
        raise HTTPException(status_code=401, detail="无效的认证格式")
    token = parts[1]
    try:
        payload = jwt.decode(token, JWT_SECRET_KEY, algorithms=[JWT_ALGORITHM])
        user_id = payload.get("sub")
        if user_id is None:
            raise HTTPException(status_code=401, detail="无效的令牌")
    except JWTError:
        raise HTTPException(status_code=401, detail="无效或过期的令牌")

    user = db.query(AdminUser).filter(AdminUser.id == int(user_id)).first()
    if not user:
        raise HTTPException(status_code=401, detail="用户不存在")
    return user


def joke_to_response(joke: Joke) -> JokeResponse:
    """Convert Joke model to JokeResponse schema."""
    return JokeResponse(
        id=joke.id,
        title=joke.title,
        content=joke.content,
        type_id=joke.type_id,
        crowd_id=joke.crowd_id,
        status=joke.status,
        view_count=joke.view_count,
        like_count=joke.like_count,
        created_at=joke.created_at,
        updated_at=joke.updated_at,
        type_name=joke.type.name if joke.type else None,
        crowd_name=joke.crowd.name if joke.crowd else None,
    )


# Admin Jokes Routes
@router.get("/jokes", response_model=PaginatedJokeResponse)
def admin_list_jokes(
    page: int = 1,
    page_size: int = 20,
    status: str = None,
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """获取所有笑话（支持状态筛选）"""
    query = db.query(Joke)
    if status:
        query = query.filter(Joke.status == status)
    total = query.count()
    offset = (page - 1) * page_size
    jokes = query.order_by(Joke.created_at.desc()).offset(offset).limit(page_size).all()
    return PaginatedJokeResponse(
        items=[joke_to_response(j) for j in jokes],
        total=total,
        page=page,
        page_size=page_size,
    )


@router.post("/jokes", response_model=JokeResponse)
def admin_create_joke(
    joke: JokeCreate,
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """创建笑话"""
    db_joke = Joke(**joke.model_dump())
    db.add(db_joke)
    db.commit()
    db.refresh(db_joke)
    return joke_to_response(db_joke)


@router.put("/jokes/{joke_id}", response_model=JokeResponse)
def admin_update_joke(
    joke_id: int,
    joke: JokeUpdate,
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """更新笑话"""
    db_joke = db.query(Joke).filter(Joke.id == joke_id).first()
    if not db_joke:
        raise HTTPException(status_code=404, detail="笑话不存在")
    update_data = joke.model_dump(exclude_unset=True)
    for key, value in update_data.items():
        setattr(db_joke, key, value)
    db.commit()
    db.refresh(db_joke)
    return joke_to_response(db_joke)


@router.delete("/jokes/{joke_id}")
def admin_delete_joke(
    joke_id: int,
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """删除笑话"""
    db_joke = db.query(Joke).filter(Joke.id == joke_id).first()
    if not db_joke:
        raise HTTPException(status_code=404, detail="笑话不存在")
    db.delete(db_joke)
    db.commit()
    return {"message": "删除成功"}


@router.put("/jokes/batch-approve")
def admin_batch_approve(
    joke_ids: list[int],
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """批量审核通过笑话"""
    jokes = db.query(Joke).filter(Joke.id.in_(joke_ids)).all()
    for joke in jokes:
        joke.status = "approved"
    db.commit()
    return {"message": f"已审核通过 {len(jokes)} 条笑话"}


@router.get("/stats")
def admin_stats(
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """获取统计数据"""
    total_jokes = db.query(Joke).count()
    approved_jokes = db.query(Joke).filter(Joke.status == "approved").count()
    pending_jokes = db.query(Joke).filter(Joke.status == "pending").count()
    total_views = db.query(Joke).with_entities(func.sum(Joke.view_count)).scalar() or 0
    total_likes = db.query(Joke).with_entities(func.sum(Joke.like_count)).scalar() or 0
    return {
        "total_jokes": total_jokes,
        "approved_jokes": approved_jokes,
        "pending_jokes": pending_jokes,
        "total_views": total_views,
        "total_likes": total_likes,
    }


# Categories CRUD
@router.post("/types", response_model=JokeTypeResponse)
def admin_create_type(
    joke_type: JokeTypeCreate,
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """创建笑话类型"""
    db_type = JokeType(name=joke_type.name, icon=joke_type.icon, sort_order=joke_type.sort_order)
    db.add(db_type)
    db.commit()
    db.refresh(db_type)
    return JokeTypeResponse.model_validate(db_type)


@router.put("/types/{type_id}", response_model=JokeTypeResponse)
def admin_update_type(
    type_id: int,
    joke_type: JokeTypeResponse,
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """更新笑话类型"""
    db_type = db.query(JokeType).filter(JokeType.id == type_id).first()
    if not db_type:
        raise HTTPException(status_code=404, detail="类型不存在")
    db_type.name = joke_type.name
    if joke_type.icon is not None:
        db_type.icon = joke_type.icon
    if joke_type.sort_order is not None:
        db_type.sort_order = joke_type.sort_order
    db.commit()
    db.refresh(db_type)
    return JokeTypeResponse.model_validate(db_type)


@router.delete("/types/{type_id}")
def admin_delete_type(
    type_id: int,
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """删除笑话类型"""
    db_type = db.query(JokeType).filter(JokeType.id == type_id).first()
    if not db_type:
        raise HTTPException(status_code=404, detail="类型不存在")
    # Check if there are jokes using this type
    joke_count = db.query(Joke).filter(Joke.type_id == type_id).count()
    if joke_count > 0:
        raise HTTPException(status_code=400, detail=f"有 {joke_count} 条笑话使用此类型，无法删除")
    db.delete(db_type)
    db.commit()
    return {"message": "删除成功"}


@router.post("/crowds", response_model=JokeCrowdResponse)
def admin_create_crowd(
    crowd: JokeCrowdCreate,
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """创建笑话人群分类"""
    db_crowd = JokeCrowd(name=crowd.name, icon=crowd.icon, sort_order=crowd.sort_order)
    db.add(db_crowd)
    db.commit()
    db.refresh(db_crowd)
    return JokeCrowdResponse.model_validate(db_crowd)


@router.put("/crowds/{crowd_id}", response_model=JokeCrowdResponse)
def admin_update_crowd(
    crowd_id: int,
    crowd: JokeCrowdResponse,
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """更新笑话人群分类"""
    db_crowd = db.query(JokeCrowd).filter(JokeCrowd.id == crowd_id).first()
    if not db_crowd:
        raise HTTPException(status_code=404, detail="人群分类不存在")
    db_crowd.name = crowd.name
    if crowd.icon is not None:
        db_crowd.icon = crowd.icon
    if crowd.sort_order is not None:
        db_crowd.sort_order = crowd.sort_order
    db.commit()
    db.refresh(db_crowd)
    return JokeCrowdResponse.model_validate(db_crowd)


@router.delete("/crowds/{crowd_id}")
def admin_delete_crowd(
    crowd_id: int,
    db: Session = Depends(get_db),
    current_user: AdminUser = Depends(get_current_admin_user),
):
    """删除笑话人群分类"""
    db_crowd = db.query(JokeCrowd).filter(JokeCrowd.id == crowd_id).first()
    if not db_crowd:
        raise HTTPException(status_code=404, detail="人群分类不存在")
    # Check if there are jokes using this crowd
    joke_count = db.query(Joke).filter(Joke.crowd_id == crowd_id).count()
    if joke_count > 0:
        raise HTTPException(status_code=400, detail=f"有 {joke_count} 条笑话使用此人群，无法删除")
    db.delete(db_crowd)
    db.commit()
    return {"message": "删除成功"}