import uuid
from typing import Optional

from fastapi import APIRouter, HTTPException, status, Depends, Security
from sqlalchemy.exc import SQLAlchemyError
from sqlalchemy.orm import Session

from ..schemas.auth import UserToken
import barker.schemas.master as schemas
from ..core.security import get_current_active_user as get_user
from ..db.session import SessionLocal
from ..models.master import Device

router = APIRouter()


# Dependency
def get_db():
    try:
        db = SessionLocal()
        yield db
    finally:
        db.close()


@router.post("", response_model=schemas.Device)
def save(
    data: schemas.DeviceIn, db: Session = Depends(get_db), user: UserToken = Security(get_user, scopes=["devices"]),
):
    try:
        item = Device(name=data.name, section_id=data.section.id_)
        db.add(item)
        db.commit()
        return device_info(item)
    except SQLAlchemyError as e:
        db.rollback()
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR, detail=str(e),
        )
    except Exception:
        db.rollback()
        raise


@router.put("/{id_}", response_model=schemas.Device)
def update(
    id_: uuid.UUID,
    data: schemas.DeviceIn,
    db: Session = Depends(get_db),
    user: UserToken = Security(get_user, scopes=["devices"]),
):
    try:
        item: Device = db.query(Device).filter(Device.id == id_).first()
        item.name = data.name
        item.section_id = data.section.id_
        db.commit()
        return device_info(item)
    except SQLAlchemyError as e:
        db.rollback()
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR, detail=str(e),
        )
    except Exception:
        db.rollback()
        raise


@router.delete("/{id_}")
def delete(
        id_: uuid.UUID, db: Session = Depends(get_db), user: UserToken = Security(get_user, scopes=["devices"]),
):
    try:
        item: Device = db.query(Device).filter(Device.id == id_).first()
        db.delete(item)
        db.commit()
        return device_info(item)
    except SQLAlchemyError as e:
        db.rollback()
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR, detail=str(e),
        )
    except Exception:
        db.rollback()
        raise


@router.get("")
def show_blank(
    db: Session = Depends(get_db), user: UserToken = Security(get_user, scopes=["devices"]),
):
    return device_info(None)


@router.get("/list")
def show_list(db: Session = Depends(get_db), user: UserToken = Depends(get_user)):
    return [device_info(item) for item in db.query(Device).order_by(Device.name).all()]


@router.get("/{id_}")
def show_id(
        id_: uuid.UUID, db: Session = Depends(get_db), user: UserToken = Security(get_user, scopes=["devices"]),
):
    item: Device = db.query(Device).filter(Device.id == id_).first()
    return device_info(item)


def device_info(item: Optional[Device]):
    if item is None:
        return {"name": "", "section": {}}
    return {
        "id": item.id,
        "name": item.name,
        "section": {"id": item.section_id, "name": item.section.name},
    }