from typing import Annotated

from fastapi import Depends, HTTPException, Path
from fastapi.security import OAuth2PasswordBearer
from jwt import InvalidTokenError

from src.api.dependacies.db_dep import sessionDep
from src.core.auth_manager import AuthManager
from src.core.settings import settings
from src.schemas.auth import TokenData
from src.services.tasks import TaskService
from src.services.users import UserService

oauth2_scheme = OAuth2PasswordBearer(tokenUrl=f"{settings.api.v1_login_url}/login")


async def get_current_user(token: Annotated[str, Depends(oauth2_scheme)]):
    credentials_exception = HTTPException(
        status_code=401,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": "Bearer"},
    )
    try:
        payload = AuthManager.decode_access_token(token=token)
        if payload is None:
            raise credentials_exception
        user = TokenData(**payload)
    except InvalidTokenError:
        raise credentials_exception
    return user


CurrentUser = Annotated[TokenData, Depends(get_current_user)]


def get_current_active_user(
    current_user: CurrentUser,
):
    if not current_user.is_active:
        raise HTTPException(status_code=400, detail="Inactive user")
    return current_user


ActiveUser = Annotated[TokenData, Depends(get_current_active_user)]


async def get_admin_user(db: sessionDep, current_user: ActiveUser):
    await UserService(db).validate_admin_user(current_user.sub)
    return current_user


AdminUser = Annotated[TokenData, Depends(get_admin_user)]


async def user_or_admin(db: sessionDep, current_user: ActiveUser, owner_id: int):
    if current_user.id == owner_id:
        return current_user
    else:
        admin = await get_admin_user(db, current_user)
        return admin


async def CurrentOrAdminOwner(
    db: sessionDep, current_user: ActiveUser, id: Annotated[int, Path()]
):
    authorized_user = await user_or_admin(db, current_user, id)
    if not authorized_user:
        raise HTTPException(status_code=403, detail="Not authorized")
    return authorized_user


async def CurrentOrAdminTask(
    db: sessionDep,
    id: Annotated[int, Path()],
    current_user: ActiveUser,
):
    task = await TaskService(db).get_task(id)
    if not task:
        raise HTTPException(status_code=404, detail="Task not found")

    return await CurrentOrAdminOwner(db, current_user, task.user_id)


OwnerDep = Annotated[TokenData, Depends(CurrentOrAdminOwner)]

TaskOwnerDep = Annotated[TokenData, Depends(CurrentOrAdminTask)]