"""UI AppConfig persistence (Streamlit state module)."""

from __future__ import annotations

import os
from pathlib import Path
from unittest.mock import patch

from shelly_manager.core.config import AppConfig


def test_app_config_roundtrip_json(tmp_path: Path) -> None:
    cfg = AppConfig(
        subnet_scan_cidr="192.168.23.0/24",
        discovery_http_timeout_sec=4.5,
        sqlite_path=tmp_path / "db.sqlite",
        markdown_dir=tmp_path / "md",
    )
    p = tmp_path / "ui.json"
    p.write_text(cfg.model_dump_json(indent=2), encoding="utf-8")
    loaded = AppConfig.model_validate_json(p.read_text(encoding="utf-8"))
    assert loaded.subnet_scan_cidr == "192.168.23.0/24"
    assert loaded.discovery_http_timeout_sec == 4.5


def test_persist_path_respects_env(tmp_path: Path) -> None:
    target = tmp_path / "x" / "cfg.json"
    with patch.dict(os.environ, {"SHELLY_UI_CONFIG": str(target)}, clear=False):
        from shelly_manager.ui import state as state_mod

        assert state_mod._persist_path() == target


def test_load_config_from_disk_returns_none_if_missing(tmp_path: Path) -> None:
    with patch.dict(os.environ, {"SHELLY_UI_CONFIG": str(tmp_path / "nope.json")}, clear=False):
        from shelly_manager.ui import state as state_mod

        assert state_mod._load_config_from_disk() is None