"""
In-memory data store using Pydantic models.

This module is NOT thread-safe and is intended for demos and scaffolds only.
"""

from typing import Dict

from models import Item, ItemCreate

_items: Dict[int, Item] = {
    1: Item(id=1, name="Apple", price=0.5),
    2: Item(id=2, name="Banana", price=0.3),
}

_next_id = 3


def list_items() -> list[Item]:
    return list(_items.values())


def get_item(item_id: int) -> Item:
    return _items[item_id]


def create_item(payload: ItemCreate) -> Item:
    global _next_id
    item = Item(id=_next_id, **payload.model_dump())
    _items[_next_id] = item
    _next_id += 1
    return item


def update_item(item_id: int, payload: ItemCreate) -> Item:
    if item_id not in _items:
        raise KeyError(item_id)
    item = Item(id=item_id, **payload.model_dump())
    _items[item_id] = item
    return item


def delete_item(item_id: int) -> None:
    del _items[item_id]