import json
import shutil
from pathlib import Path

DATA_FILE = Path("data/warmachron.json")

def load_data():
    if not DATA_FILE.exists() or DATA_FILE.stat().st_size == 0:
        return {"version": 1, "players": {}, "wars": []}

    try:
        with open(DATA_FILE, "r", encoding="utf-8") as f:
            return json.load(f)
    except json.JSONDecodeError:
        raise RuntimeError("Data file is corrupted")

def save_data(data):
    if DATA_FILE.exists():
        shutil.copy(DATA_FILE, DATA_FILE.with_suffix(".json.bak"))

    with open(DATA_FILE, "w", encoding="utf-8") as f:
        json.dump(data, f, indent=2)