from __future__ import annotations

from dataclasses import dataclass
from typing import Annotated

from fastapi import Depends, Header, Query
from sqlalchemy.orm import Session

from app.db.session import get_db


DbSession = Annotated[Session, Depends(get_db)]

PageNumber = Annotated[int, Query(ge=1, description="页码")]
PageSize = Annotated[int, Query(ge=1, le=200, description="每页数量")]


@dataclass(frozen=True)
class ActorContext:
    user_name: str
    roles: tuple[str, ...]
    mine_id: str | None = None


def get_actor_context(
    x_user_name: str = Header(default="default"),
    x_user_roles: str = Header(default="viewer"),
    x_mine_id: str | None = Header(default=None),
) -> ActorContext:
    return ActorContext(
        user_name=x_user_name,
        roles=tuple(role.strip() for role in x_user_roles.split(",") if role.strip()),
        mine_id=x_mine_id,
    )


Actor = Annotated[ActorContext, Depends(get_actor_context)]