"""FastAPI CRUD — yksi endpoint-setti per entiteetti."""

from fastapi import FastAPI, Depends, HTTPException
from sqlalchemy.orm import Session

from models import SessionLocal, Todo
from schemas import TodoCreate, TodoResponse

app = FastAPI()


def get_db():
    """Tietokantasessio per pyyntö."""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


@app.post("/todos/", response_model=TodoResponse, status_code=201)
def create_todo(item: TodoCreate, db: Session = Depends(get_db)):
    db_item = Todo(**item.model_dump())
    db.add(db_item)
    db.commit()
    db.refresh(db_item)
    return db_item


@app.get("/todos/", response_model=list[TodoResponse])
def list_todos(db: Session = Depends(get_db)):
    return db.query(Todo).all()


@app.get("/todos/{item_id}", response_model=TodoResponse)
def get_todo(item_id: int, db: Session = Depends(get_db)):
    item = db.query(Todo).filter(Todo.id == item_id).first()
    if not item:
        raise HTTPException(status_code=404, detail="Todo not found")
    return item


@app.put("/todos/{item_id}", response_model=TodoResponse)
def update_todo(item_id: int, item: TodoCreate, db: Session = Depends(get_db)):
    db_item = db.query(Todo).filter(Todo.id == item_id).first()
    if not db_item:
        raise HTTPException(status_code=404, detail="Todo not found")
    for key, value in item.model_dump().items():
        setattr(db_item, key, value)
    db.commit()
    db.refresh(db_item)
    return db_item


@app.delete("/todos/{item_id}", status_code=204)
def delete_todo(item_id: int, db: Session = Depends(get_db)):
    db_item = db.query(Todo).filter(Todo.id == item_id).first()
    if not db_item:
        raise HTTPException(status_code=404, detail="Todo not found")
    db.delete(db_item)
    db.commit()