from pathlib import Path

import pytest

from pve_vm_setup.errors import SettingsError
from pve_vm_setup.settings import AppSettings, resolve_dotenv_paths, write_config_dotenv


def test_settings_load_defaults_and_normalize_api_base() -> None:
    settings = AppSettings.from_env(
        {
            "PROXMOX_URL": "https://proxmox.example.invalid:8006/",
            "PROXMOX_USER": "root",
            "PROXMOX_PASSWORD": "secret",
            "PROXMOX_REALM": "pam",
            "PROXMOX_API_BASE": "api2/json",
        },
        load_dotenv_file=False,
    )

    assert settings.proxmox_url == "https://proxmox.example.invalid:8006"
    assert settings.proxmox_api_base == "/api2/json"
    assert settings.proxmox_verify_tls is False
    assert settings.request_timeout_seconds == 15
    assert settings.default_iso_selector is None
    assert settings.effective_username == "root@pam"
    assert settings.safety_policy.prevent_create is False
    assert settings.safety_policy.enable_test_mode is False
    assert settings.safety_policy.test_tag == "codex-e2e"
    assert settings.safety_policy.test_vm_name_prefix == "codex-e2e-"


def test_settings_reject_test_mode_without_required_scope() -> None:
    with pytest.raises(SettingsError):
        AppSettings.from_env(
            {
                "PROXMOX_ENABLE_TEST_MODE": "true",
            },
            load_dotenv_file=False,
        )


def test_settings_allow_create_without_test_scope_when_test_mode_disabled() -> None:
    settings = AppSettings.from_env(
        {
            "PROXMOX_PREVENT_CREATE": "false",
        },
        load_dotenv_file=False,
    )

    assert settings.safety_policy.allow_create is True
    assert settings.safety_policy.enable_test_mode is False


def test_settings_allow_create_by_default_when_prevent_flag_is_unset() -> None:
    settings = AppSettings.from_env({}, load_dotenv_file=False)

    assert settings.safety_policy.prevent_create is False
    assert settings.safety_policy.allow_create is True


def test_settings_treat_url_only_as_live_capable_for_interactive_login() -> None:
    settings = AppSettings.from_env(
        {
            "PROXMOX_URL": "https://proxmox.example.invalid:8006",
        },
        load_dotenv_file=False,
    )

    assert settings.is_live_configured is True


def test_settings_validate_live_requirements_still_needs_login_defaults_for_doctor() -> None:
    settings = AppSettings.from_env(
        {
            "PROXMOX_URL": "https://proxmox.example.invalid:8006",
        },
        load_dotenv_file=False,
    )

    with pytest.raises(SettingsError):
        settings.validate_live_requirements()


def test_settings_reject_invalid_default_iso_regex_selector() -> None:
    with pytest.raises(SettingsError):
        AppSettings.from_env(
            {
                "PROXMOX_DEFAULT_ISO_SELECTOR": "regex:[unterminated",
            },
            load_dotenv_file=False,
        )


def test_settings_loads_current_directory_dotenv_when_present(tmp_path: Path, monkeypatch) -> None:
    monkeypatch.chdir(tmp_path)
    monkeypatch.setenv("HOME", str(tmp_path / "home"))
    (tmp_path / ".env").write_text(
        "PROXMOX_URL=https://cwd.example.invalid:8006\n",
        encoding="utf-8",
    )

    settings = AppSettings.from_env({}, load_dotenv_file=True)

    assert settings.proxmox_url == "https://cwd.example.invalid:8006"


def test_settings_prefers_config_dotenv_over_current_directory_dotenv(
    tmp_path: Path, monkeypatch
) -> None:
    home = tmp_path / "home"
    config_dir = home / ".config" / "pve-vm-setup"
    config_dir.mkdir(parents=True)
    monkeypatch.chdir(tmp_path)
    monkeypatch.setenv("HOME", str(home))
    (tmp_path / ".env").write_text(
        "PROXMOX_URL=https://cwd.example.invalid:8006\n",
        encoding="utf-8",
    )
    (config_dir / ".env").write_text(
        "PROXMOX_URL=https://config.example.invalid:8006\n",
        encoding="utf-8",
    )

    settings = AppSettings.from_env({}, load_dotenv_file=True)

    assert settings.proxmox_url == "https://config.example.invalid:8006"


def test_settings_prefers_environment_over_config_and_current_directory_dotenv(
    tmp_path: Path, monkeypatch
) -> None:
    home = tmp_path / "home"
    config_dir = home / ".config" / "pve-vm-setup"
    config_dir.mkdir(parents=True)
    monkeypatch.chdir(tmp_path)
    monkeypatch.setenv("HOME", str(home))
    (tmp_path / ".env").write_text(
        "PROXMOX_URL=https://cwd.example.invalid:8006\n",
        encoding="utf-8",
    )
    (config_dir / ".env").write_text(
        "PROXMOX_URL=https://config.example.invalid:8006\n",
        encoding="utf-8",
    )

    settings = AppSettings.from_env(
        {
            "PROXMOX_URL": "https://env.example.invalid:8006",
        },
        load_dotenv_file=True,
    )

    assert settings.proxmox_url == "https://env.example.invalid:8006"


def test_resolve_dotenv_paths_uses_standard_config_location(tmp_path: Path, monkeypatch) -> None:
    home = tmp_path / "home"
    monkeypatch.setenv("HOME", str(home))

    paths = resolve_dotenv_paths()

    assert paths.cwd == Path(".env")
    assert paths.config == home / ".config" / "pve-vm-setup" / ".env"
    assert paths.any_exists is False


def test_write_config_dotenv_creates_parent_directory_and_skips_blank_values(
    tmp_path: Path,
) -> None:
    target = tmp_path / "home" / ".config" / "pve-vm-setup" / ".env"

    written_path = write_config_dotenv(
        {
            "PROXMOX_URL": "https://pve.example.invalid:8006",
            "PROXMOX_USER": "root",
            "PROXMOX_PASSWORD": "",
        },
        config_dotenv_path=target,
    )

    assert written_path == target
    assert target.exists()
    assert target.read_text(encoding="utf-8") == (
        "# Generated by pve-vm-setup\n"
        "PROXMOX_URL=https://pve.example.invalid:8006\n"
        "PROXMOX_USER=root\n"
    )