import uuid
from decimal import Decimal
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 Tax

router = APIRouter()


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


@router.post("", response_model=schemas.Tax)
def save(
    data: schemas.TaxIn, db: Session = Depends(get_db), user: UserToken = Security(get_user, scopes=["taxes"]),
):
    try:
        item = Tax(name=data.name, rate=round(data.rate / Decimal(100), 4))
        db.add(item)
        db.commit()
        return tax_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.Tax)
def update(
    id_: uuid.UUID,
    data: schemas.TaxIn,
    db: Session = Depends(get_db),
    user: UserToken = Security(get_user, scopes=["taxes"]),
):
    try:
        item: Tax = db.query(Tax).filter(Tax.id == id_).first()
        if item.is_fixture:
            raise HTTPException(
                status_code=status.HTTP_423_LOCKED, detail=f"{item.name} is a fixture and cannot be edited or deleted.",
            )
        item.name = data.name
        item.rate = round(data.rate / Decimal(100), 4)
        db.commit()
        return tax_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=["taxes"]),
):
    try:
        item: Tax = db.query(Tax).filter(Tax.id == id_).first()
        if item is None:
            raise HTTPException(
                status_code=status.HTTP_404_NOT_FOUND, detail="Tax not found",
            )
        elif item.is_fixture:
            raise HTTPException(
                status_code=status.HTTP_423_LOCKED, detail=f"{item.name} is a fixture and cannot be edited or deleted.",
            )
        else:
            db.delete(item)
            db.commit()
            return tax_info(None)
    except Exception:
        db.rollback()
        raise


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


@router.get("/list")
def show_list(db: Session = Depends(get_db), user: UserToken = Depends(get_user)):
    return [
        {"id": item.id, "name": item.name, "rate": item.rate, "isFixture": item.is_fixture}
        for item in db.query(Tax).order_by(Tax.name).all()
    ]


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


def tax_info(item: Optional[Tax]):
    if item is None:
        tax = {"name": "", "rate": 0, "isFixture": False}
    else:
        tax = {
            "id": item.id,
            "name": item.name,
            "rate": item.rate * 100,
            "isFixture": item.is_fixture,
        }
    return tax