"""Tests de Bus, CardInstance, Topology."""

from __future__ import annotations

import pytest
from pydantic import ValidationError

from vmssailor.core import (
    Bus,
    BusRole,
    CardInstance,
    Protocol,
    Topology,
)


def test_bus_modbus_rtu_ok() -> None:
    Bus(id="b", name="b", protocol=Protocol.MODBUS_RTU, physical_port="COM3")


def test_bus_invalid_protocol_rejected() -> None:
    with pytest.raises(ValidationError):
        Bus(id="b", name="b", protocol=Protocol.J1939, physical_port="COM3")


def test_card_slave_requires_modbus_addr() -> None:
    with pytest.raises(ValidationError):
        CardInstance(
            id="c", slot_number=1, bus_id="bm", bus_role=BusRole.MODBUS_SLAVE
        )


def test_card_n2k_node_no_modbus_addr() -> None:
    CardInstance(
        id="c", slot_number=1, bus_id="bm", bus_role=BusRole.NMEA2000_NODE
    )
    with pytest.raises(ValidationError):
        CardInstance(
            id="c", slot_number=1, bus_id="bm",
            bus_role=BusRole.NMEA2000_NODE, modbus_address=5,
        )


def test_topology_unique_slots_per_bus() -> None:
    b = Bus(id="bm", name="bm", protocol=Protocol.MODBUS_RTU, physical_port="COM3")
    c1 = CardInstance(
        id="c1", slot_number=1, bus_id="bm",
        bus_role=BusRole.MODBUS_SLAVE, modbus_address=1,
    )
    c2 = CardInstance(
        id="c2", slot_number=1, bus_id="bm",
        bus_role=BusRole.MODBUS_SLAVE, modbus_address=2,
    )
    with pytest.raises(ValidationError):
        Topology(buses=[b], cards=[c1, c2])


def test_topology_unique_modbus_addresses_per_bus() -> None:
    b = Bus(id="bm", name="bm", protocol=Protocol.MODBUS_RTU, physical_port="COM3")
    c1 = CardInstance(
        id="c1", slot_number=1, bus_id="bm",
        bus_role=BusRole.MODBUS_SLAVE, modbus_address=5,
    )
    c2 = CardInstance(
        id="c2", slot_number=2, bus_id="bm",
        bus_role=BusRole.MODBUS_SLAVE, modbus_address=5,
    )
    with pytest.raises(ValidationError):
        Topology(buses=[b], cards=[c1, c2])


def test_topology_card_references_existing_bus() -> None:
    b = Bus(id="bm", name="bm", protocol=Protocol.MODBUS_RTU, physical_port="COM3")
    c = CardInstance(
        id="c", slot_number=1, bus_id="other_bus",
        bus_role=BusRole.MODBUS_SLAVE, modbus_address=1,
    )
    with pytest.raises(ValidationError):
        Topology(buses=[b], cards=[c])


def test_topology_helpers(sample_topology: Topology) -> None:
    assert sample_topology.bus_by_id("bus_main") is not None
    assert sample_topology.bus_by_id("nope") is None
    assert sample_topology.card_by_id("card_001") is not None
    assert sample_topology.card_by_id("nope") is None