"""Трекер созданных инстансов — только те что породило приложение."""
import json
import os
import threading

_LOCK = threading.Lock()
_PATH = "/tmp/instances.json"

_INITIAL = {
    "884356cf-5212-4395-b56b-27c58a5fc1fa": {"svcId": 1, "displayName": "autotest-1-first", "instanceUid": "884356cf-5212-4395-b56b-27c58a5fc1fa"},
    "6528854d-a4ea-428c-9fa4-68e85fa9b3ac": {"svcId": 1, "displayName": "curl-test-144834", "instanceUid": "6528854d-a4ea-428c-9fa4-68e85fa9b3ac"},
    "fdcb5887-39f7-4ef8-a9c0-d55e434a55ff": {"svcId": 1, "displayName": "curl-final-test", "instanceUid": "fdcb5887-39f7-4ef8-a9c0-d55e434a55ff"},
}


def _load():
    try:
        with open(_PATH) as f:
            return json.load(f)
    except (FileNotFoundError, json.JSONDecodeError):
        data = dict(_INITIAL)
        _save(data)
        return data


def _save(data):
    with open(_PATH, "w") as f:
        json.dump(data, f, indent=2)


def add(instance_uid, svc_id, display_name):
    with _LOCK:
        data = _load()
        data[instance_uid] = {
            "svcId": svc_id,
            "displayName": display_name,
            "instanceUid": instance_uid,
        }
        _save(data)


def remove(instance_uid):
    with _LOCK:
        data = _load()
        data.pop(instance_uid, None)
        _save(data)


def list_all():
    with _LOCK:
        return list(_load().values())