from __future__ import annotations

import importlib.util
import stat
from pathlib import Path
from types import ModuleType

import pytest


def _prepare_module() -> ModuleType:
    path = (
        Path(__file__).resolve().parents[1]
        / "deploy"
        / "telemetry-plane"
        / "prepare.py"
    )
    specification = importlib.util.spec_from_file_location(
        "mission_core_telemetry_prepare",
        path,
    )
    assert specification is not None
    assert specification.loader is not None
    module = importlib.util.module_from_spec(specification)
    specification.loader.exec_module(module)
    return module


prepare = _prepare_module()


def test_initialize_environment_generates_private_unique_secrets(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    env_path = tmp_path / ".env"
    monkeypatch.setattr(prepare, "ENV_PATH", env_path)

    prepare._initialize_environment("192.0.2.15")

    values = dict(
        line.split("=", 1)
        for line in env_path.read_text(encoding="utf-8").splitlines()
    )
    assert values["MISSIONCORE_MQTT_BIND_ADDRESS"] == "192.0.2.15"
    secrets = {
        values["MISSIONCORE_DB_PASSWORD"],
        values["MISSIONCORE_MQTT_INGEST_PASSWORD"],
        values["MISSIONCORE_MQTT_WORKER_006_PASSWORD"],
    }
    assert len(secrets) == 3
    assert all(len(secret) >= 40 for secret in secrets)
    assert stat.S_IMODE(env_path.stat().st_mode) == 0o600


def test_initialize_environment_refuses_to_replace_credentials(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    env_path = tmp_path / ".env"
    env_path.write_text("existing=true\n", encoding="utf-8")
    monkeypatch.setattr(prepare, "ENV_PATH", env_path)

    with pytest.raises(RuntimeError, match="refusing to overwrite"):
        prepare._initialize_environment("127.0.0.1")

    assert env_path.read_text(encoding="utf-8") == "existing=true\n"