"""
In-memory mock data store for CRUD example.

This module intentionally avoids persistence and concurrency guarantees.
It is suitable for demos, tests, and scaffolding only.
"""

from typing import Dict

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

_next_id = 3


def list_items():
    return list(_items.values())


def get_item(item_id: int):
    return _items[item_id]


def create_item(payload: dict):
    global _next_id
    item = {"id": _next_id, **payload}
    _items[_next_id] = item
    _next_id += 1
    return item


def update_item(item_id: int, payload: dict):
    item = {"id": item_id, **payload}
    _items[item_id] = item
    return item


def delete_item(item_id: int):
    del _items[item_id]