import os
import textwrap
import pytest
from fablednetmon.config import load_config

def test_load_minimal_config(tmp_path):
    cfg_file = tmp_path / "config.yaml"
    cfg_file.write_text(textwrap.dedent("""\
        database:
          url: postgresql+asyncpg://user:pass@localhost/fablednetmon
        secret_key: test-secret
    """))
    cfg = load_config(cfg_file)
    assert cfg["database"]["url"] == "postgresql+asyncpg://user:pass@localhost/fablednetmon"
    assert cfg["secret_key"] == "test-secret"

def test_env_var_overrides_scalar(tmp_path, monkeypatch):
    cfg_file = tmp_path / "config.yaml"
    cfg_file.write_text("database:\n  url: original\nsecret_key: s\n")
    monkeypatch.setenv("FABLEDNETMON_DATABASE__URL", "overridden")
    cfg = load_config(cfg_file)
    assert cfg["database"]["url"] == "overridden"

def test_env_var_does_not_override_list(tmp_path, monkeypatch):
    cfg_file = tmp_path / "config.yaml"
    cfg_file.write_text("smtp:\n  recipients:\n    - a@b.com\nsecret_key: s\ndatabase:\n  url: x\n")
    monkeypatch.setenv("FABLEDNETMON_SMTP__RECIPIENTS", "bad")
    cfg = load_config(cfg_file)
    assert cfg["smtp"]["recipients"] == ["a@b.com"]

def test_missing_required_key_raises(tmp_path):
    cfg_file = tmp_path / "config.yaml"
    cfg_file.write_text("{}")
    with pytest.raises(ValueError, match="secret_key"):
        load_config(cfg_file)