from typing import List, Optional

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

from models.consumption import Consumption
from routes.dependencies import get_db


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


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

    @field_validator("unit_name", "unit_symbol")
    @classmethod
    def _normalize_text(cls, value: Optional[str]) -> Optional[str]:
        if value is None:
            return None
        stripped = value.strip()
        return stripped or None


class ConsumptionCreate(ConsumptionBase):
    pass


class ConsumptionRead(ConsumptionBase):
    id: int
    model_config = ConfigDict(from_attributes=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.model_dump())
    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()