import unittest

from pydantic import ValidationError

from app.schemas.modbus import ModbusRawReadRequest


class ModbusSchemaTest(unittest.TestCase):
    def test_device_type_defaults_to_modbus_tcp(self):
        request = ModbusRawReadRequest(
            ip="192.168.75.248",
            port=5512,
            slave_id=1,
            read={"function_code": 3, "address": 0, "quantity": 10},
        )

        self.assertEqual("ModbusTCP", request.device_type)

    def test_port_is_required(self):
        with self.assertRaises(ValidationError) as context:
            ModbusRawReadRequest(
                ip="192.168.75.248",
                read={"function_code": 3, "address": 0, "quantity": 10},
            )

        self.assertIn("port", str(context.exception))

    def test_slave_id_is_required(self):
        with self.assertRaises(ValidationError) as context:
            ModbusRawReadRequest(
                ip="192.168.75.248",
                port=5512,
                read={"function_code": 3, "address": 0, "quantity": 10},
            )

        self.assertIn("slave_id", str(context.exception))

    def test_ip_must_be_valid_address(self):
        with self.assertRaises(ValidationError) as context:
            ModbusRawReadRequest(
                ip="not-an-ip",
                port=5512,
                slave_id=1,
                read={"function_code": 3, "address": 0, "quantity": 10},
            )

        self.assertIn("ip must be a valid IP address", str(context.exception))


if __name__ == "__main__":
    unittest.main()