import json
import os
import stat

import pytest

from client.config import (
    Config,
    ConfigMissingError,
    config_path,
    load_config,
    save_config,
)


def test_config_path_under_assistant_state(tmp_path, monkeypatch):
    monkeypatch.setenv("HOME", str(tmp_path))
    assert config_path() == tmp_path / "assistant" / "state" / "config.json"


def test_load_missing_raises(tmp_path, monkeypatch):
    monkeypatch.setenv("HOME", str(tmp_path))
    with pytest.raises(ConfigMissingError):
        load_config()


def test_save_then_load_round_trip(tmp_path, monkeypatch):
    monkeypatch.setenv("HOME", str(tmp_path))
    cfg = Config(
        device_id="11111111-1111-1111-1111-111111111111",
        device_token="t0k3n",
        backend_ws="wss://example/device",
    )
    save_config(cfg)
    loaded = load_config()
    assert loaded == cfg


def test_save_creates_parent_dirs(tmp_path, monkeypatch):
    monkeypatch.setenv("HOME", str(tmp_path))
    cfg = Config(device_id="x", device_token="y", backend_ws="wss://z")
    save_config(cfg)
    assert (tmp_path / "assistant" / "state").is_dir()


def test_save_sets_mode_0600(tmp_path, monkeypatch):
    monkeypatch.setenv("HOME", str(tmp_path))
    cfg = Config(device_id="x", device_token="y", backend_ws="wss://z")
    save_config(cfg)
    mode = stat.S_IMODE(os.stat(config_path()).st_mode)
    assert mode == 0o600


def test_load_rejects_missing_fields(tmp_path, monkeypatch):
    monkeypatch.setenv("HOME", str(tmp_path))
    config_path().parent.mkdir(parents=True, exist_ok=True)
    config_path().write_text(json.dumps({"device_id": "x"}))
    with pytest.raises(ConfigMissingError):
        load_config()