"""Tests for warden.config."""
from pathlib import Path

import pytest
import yaml

from warden.config import ConfigError, load_config


def write_yaml(path: Path, content: dict) -> None:
    with path.open("w") as f:
        yaml.dump(content, f)


def test_load_local_config(tmp_path):
    cfg_path = tmp_path / "warden.yaml"
    write_yaml(cfg_path, {"backend": "local", "ca_key": str(tmp_path / "ca")})
    cfg = load_config(cfg_path)
    assert cfg.backend == "local"
    assert cfg.ca_key == tmp_path / "ca"


def test_local_backend_missing_ca_key_raises(tmp_path):
    cfg_path = tmp_path / "warden.yaml"
    write_yaml(cfg_path, {"backend": "local"})
    with pytest.raises(ConfigError, match="ca_key"):
        load_config(cfg_path)


def test_invalid_backend_raises(tmp_path):
    cfg_path = tmp_path / "warden.yaml"
    write_yaml(cfg_path, {"backend": "magic", "ca_key": "/tmp/ca"})
    with pytest.raises(ConfigError, match="backend"):
        load_config(cfg_path)


def test_vault_backend(tmp_path):
    cfg_path = tmp_path / "warden.yaml"
    write_yaml(cfg_path, {
        "backend": "vault",
        "vault": {
            "addr": "https://vault.example.com",
            "role_map": {"adm": "adm-role", "agt": "agt-role", "atm": "atm-role"},
        },
    })
    cfg = load_config(cfg_path)
    assert cfg.backend == "vault"
    assert cfg.vault is not None
    assert cfg.vault.addr == "https://vault.example.com"
    assert cfg.vault.role_map["agt"] == "agt-role"


def test_vault_backend_missing_addr_raises(tmp_path):
    cfg_path = tmp_path / "warden.yaml"
    write_yaml(cfg_path, {"backend": "vault", "vault": {}})
    with pytest.raises(ConfigError, match="addr"):
        load_config(cfg_path)


def test_missing_config_raises():
    with pytest.raises(ConfigError, match="not found"):
        load_config(Path("/nonexistent/path/warden.yaml"))


def test_custom_state_dir(tmp_path):
    cfg_path = tmp_path / "warden.yaml"
    custom_state = tmp_path / "my-state"
    write_yaml(cfg_path, {
        "backend": "local",
        "ca_key": str(tmp_path / "ca"),
        "state_dir": str(custom_state),
    })
    cfg = load_config(cfg_path)
    assert cfg.state_dir == custom_state


def test_default_vault_token_env(tmp_path):
    cfg_path = tmp_path / "warden.yaml"
    write_yaml(cfg_path, {
        "backend": "vault",
        "vault": {"addr": "https://vault.example.com"},
    })
    cfg = load_config(cfg_path)
    assert cfg.vault.token_env == "VAULT_TOKEN"


def test_policy_defaults_to_unknown_zone_profile(tmp_path):
    cfg_path = tmp_path / "warden.yaml"
    write_yaml(cfg_path, {"backend": "local", "ca_key": str(tmp_path / "ca")})
    cfg = load_config(cfg_path)
    assert cfg.policy.flex_auth_url is None
    assert cfg.policy.failure_modes["unknown"] == "fail_open"
    assert cfg.policy.failure_modes["z3-critical"] == "fail_closed"


def test_policy_block_parsed(tmp_path):
    cfg_path = tmp_path / "warden.yaml"
    write_yaml(cfg_path, {
        "backend": "local",
        "ca_key": str(tmp_path / "ca"),
        "policy": {
            "flex_auth_url": "http://flex-auth:8080",
            "zone_registry_path": str(tmp_path / "zones.json"),
            "failure_modes": {"z2-protected": "fail_closed"},
            "tenant": "tenant:coulomb",
            "subject_env": "MY_SUBJECT",
            "system": "warden-test",
        },
    })
    cfg = load_config(cfg_path)
    assert cfg.policy.flex_auth_url == "http://flex-auth:8080"
    assert cfg.policy.zone_registry_path == tmp_path / "zones.json"
    assert cfg.policy.failure_modes["z2-protected"] == "fail_closed"
    assert cfg.policy.tenant == "tenant:coulomb"
    assert cfg.policy.subject_env == "MY_SUBJECT"
    assert cfg.policy.system == "warden-test"


@pytest.mark.parametrize("retired", ["enabled", "fail_closed"])
def test_retired_global_policy_switches_are_rejected(tmp_path, retired):
    cfg_path = tmp_path / "warden.yaml"
    write_yaml(cfg_path, {
        "backend": "local",
        "ca_key": str(tmp_path / "ca"),
        "policy": {retired: True},
    })
    with pytest.raises(ConfigError, match=f"policy.{retired}"):
        load_config(cfg_path)