from typing import List, Optional

from fastapi import APIRouter, Depends, status
from pydantic import BaseModel, PositiveFloat
from sqlalchemy.orm import Session

from config.database import SessionLocal
from models.consumption import Consumption


router = APIRouter(prefix="/api/consumption", tags=["Consumption"])


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


class ConsumptionBase(BaseModel):
    scenario_id: int
    amount: PositiveFloat
    description: Optional[str] = None


class ConsumptionCreate(ConsumptionBase):
    pass


class ConsumptionRead(ConsumptionBase):
    id: int

    class Config:
        orm_mode = True


@router.post("/", response_model=ConsumptionRead, status_code=status.HTTP_201_CREATED)
def create_consumption(item: ConsumptionCreate, db: Session = Depends(get_db)):
    db_item = Consumption(**item.dict())
    db.add(db_item)
    db.commit()
    db.refresh(db_item)
    return db_item


@router.get("/", response_model=List[ConsumptionRead])
def list_consumption(db: Session = Depends(get_db)):
    return db.query(Consumption).all()