from fastapi import APIRouter, Depends, HTTPException
from jwt import InvalidTokenError
from sqlalchemy.orm import Session, selectinload

from app.database import get_db
from app.deps import get_current_user, user_permissions
from app.models import Role, User
from app.schemas import LoginRequest, RefreshRequest, TokenResponse, UserOut
from app.security import create_access_token, create_refresh_token, decode_token, verify_password

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


def serialize_user(user: User) -> UserOut:
    data = UserOut.model_validate(user)
    data.permissions = sorted(user_permissions(user))
    return data


@router.post("/login", response_model=TokenResponse)
def login(payload: LoginRequest, db: Session = Depends(get_db)):
    user = (
        db.query(User)
        .options(selectinload(User.roles).selectinload(Role.permissions))
        .filter(User.email == payload.email)
        .first()
    )
    if user is None or not user.is_active or not verify_password(payload.password, user.password_hash):
        raise HTTPException(status_code=401, detail="Username or password incorrect")
    return TokenResponse(access_token=create_access_token(user.id), refresh_token=create_refresh_token(user.id))


@router.post("/refresh", response_model=TokenResponse)
def refresh(payload: RefreshRequest, db: Session = Depends(get_db)):
    try:
        data = decode_token(payload.refresh_token)
        if data.get("type") != "refresh":
            raise HTTPException(status_code=401, detail="Invalid token type")
        user_id = int(data["sub"])
    except (InvalidTokenError, KeyError, ValueError) as exc:
        raise HTTPException(status_code=401, detail="Invalid refresh token") from exc
    user = db.query(User).filter(User.id == user_id, User.is_active.is_(True)).first()
    if user is None:
        raise HTTPException(status_code=401, detail="User not found")
    return TokenResponse(access_token=create_access_token(user.id), refresh_token=create_refresh_token(user.id))


@router.get("/me", response_model=UserOut)
def me(user: User = Depends(get_current_user), db: Session = Depends(get_db)):
    user = db.query(User).options(selectinload(User.roles).selectinload(Role.permissions)).filter(User.id == user.id).first()
    return serialize_user(user)