"""Config generator unit tests (spec section 64: configuration generation)."""

from __future__ import annotations

import pytest

from app.configgen import generate_config
from app.models import BrokerSettings, ListenerConfig


@pytest.fixture()
def session(db_session):
    yield db_session


def test_generate_with_one_listener(session):
    session.add(
        ListenerConfig(
            name="Production MQTT",
            port=1883,
            protocol="mqtt",
            allow_anonymous=False,
            max_connections=-1,
            tls_enabled=False,
            require_certificate=False,
            use_identity_as_username=False,
        )
    )
    session.commit()

    result = generate_config(session)
    assert "listener 1883" in result.config_text
    assert "global_plugin /usr/lib/mosquitto_dynamic_security.so" in result.config_text
    assert "allow_anonymous false" in result.config_text
    # Must NOT use options deprecated in 2.1 (spec 3.1).
    assert "per_listener_settings" not in result.config_text
    assert result.warnings == []


def test_generate_includes_global_settings(session):
    session.add(ListenerConfig(name="l", port=1883, protocol="mqtt"))
    session.add(BrokerSettings(key="max_packet_size", value="2000000", value_type="int"))
    session.commit()

    result = generate_config(session)
    assert "max_packet_size 2000000" in result.config_text


def test_generate_with_empty_model_warns_instead_of_raising(session):
    """Fresh-platform state: preview must work, not 500 (config page fix)."""
    result = generate_config(session)
    assert "global_plugin /usr/lib/mosquitto_dynamic_security.so" in result.config_text
    assert "persistence true" in result.config_text
    assert any("No enabled listeners" in w for w in result.warnings)


def test_disabled_listeners_are_omitted(session):
    session.add(ListenerConfig(name="off", port=1884, protocol="mqtt", enabled=False))
    session.add(ListenerConfig(name="on", port=1883, protocol="mqtt"))
    session.commit()

    result = generate_config(session)
    assert "listener 1883" in result.config_text
    assert "listener 1884" not in result.config_text


def test_tls_listener_without_pki_warns(session):
    session.add(
        ListenerConfig(
            name="tls-later",
            port=8883,
            protocol="mqtt",
            tls_enabled=True,
            tls_min_version="tlsv1.2",
        )
    )
    session.commit()

    result = generate_config(session)
    assert any("PKI is not available" in w for w in result.warnings)
    assert "tls_version tlsv1.2" in result.config_text