"""{{ interface_description }}

Modbus TCP/RTU communication interface using pymodbus patterns.

Generated by: madsci new comm --template comm/modbus
Template version: {{ template_version }}
"""

import logging
from typing import Any, Optional

logger = logging.getLogger(__name__)


class {{ interface_name | pascal_case }}Interface:
    """Modbus interface for {{ interface_name }}.

    Provides Modbus TCP or RTU communication with register and coil operations.

    Example:
        >>> interface = {{ interface_name | pascal_case }}Interface(host="192.168.1.100", port=502)
        >>> interface.connect()
        >>> values = interface.read_holding_registers(address=0, count=10)
        >>> interface.write_register(address=0, value=1234)
        >>> coils = interface.read_coils(address=0, count=8)
        >>> interface.disconnect()
    """

    def __init__(
        self,
        host: str = "127.0.0.1",
        port: int = 502,
        unit_id: int = 1,
        protocol: str = "tcp",
        timeout: float = 5.0,
        **kwargs: Any,
    ) -> None:
        """Initialize the Modbus interface.

        Args:
            host: Modbus device host address (TCP) or serial port path (RTU).
            port: Modbus TCP port number.
            unit_id: Modbus unit (slave) ID.
            protocol: Protocol type, either "tcp" or "rtu".
            timeout: Communication timeout in seconds.
            **kwargs: Additional Modbus client options.
        """
        self._host = host
        self._port = port
        self._unit_id = unit_id
        self._protocol = protocol.lower()
        self._timeout = timeout
        self._config = kwargs
        self._client: Any = None
        self._is_connected = False

        if self._protocol not in ("tcp", "rtu"):
            raise ValueError(f"Unsupported protocol: {self._protocol}. Use 'tcp' or 'rtu'.")

    @property
    def is_connected(self) -> bool:
        """Check if the Modbus client is connected."""
        return self._is_connected

    def connect(self) -> None:
        """Establish the Modbus connection.

        Raises:
            ConnectionError: If the connection cannot be established.
        """
        logger.info(
            f"Connecting to Modbus device at {self._host}:{self._port} "
            f"(unit {self._unit_id}, {self._protocol.upper()})..."
        )

        # TODO: Implement actual Modbus connection
        # from pymodbus.client import ModbusTcpClient, ModbusSerialClient
        # if self._protocol == "tcp":
        #     self._client = ModbusTcpClient(
        #         host=self._host, port=self._port, timeout=self._timeout
        #     )
        # else:
        #     self._client = ModbusSerialClient(
        #         port=self._host, timeout=self._timeout, **self._config
        #     )
        # self._client.connect()

        self._is_connected = True
        logger.info("Modbus connection established")

    def disconnect(self) -> None:
        """Close the Modbus connection."""
        if self._is_connected:
            logger.info("Disconnecting from Modbus device...")

            # TODO: Close actual connection
            # if self._client:
            #     self._client.close()

            self._is_connected = False
            self._client = None
            logger.info("Modbus connection closed")

    def read_holding_registers(self, address: int, count: int = 1) -> list[int]:
        """Read holding registers (function code 03).

        Args:
            address: Starting register address.
            count: Number of registers to read.

        Returns:
            List of register values.

        Raises:
            RuntimeError: If not connected.
        """
        if not self._is_connected:
            raise RuntimeError("Not connected. Call connect() first.")

        logger.debug(f"Reading {count} holding register(s) from address {address}")

        # TODO: Implement actual register read
        # result = self._client.read_holding_registers(
        #     address=address, count=count, slave=self._unit_id
        # )
        # if result.isError():
        #     raise RuntimeError(f"Modbus read error: {result}")
        # return result.registers

        return [0] * count

    def read_input_registers(self, address: int, count: int = 1) -> list[int]:
        """Read input registers (function code 04).

        Args:
            address: Starting register address.
            count: Number of registers to read.

        Returns:
            List of register values.

        Raises:
            RuntimeError: If not connected.
        """
        if not self._is_connected:
            raise RuntimeError("Not connected. Call connect() first.")

        logger.debug(f"Reading {count} input register(s) from address {address}")

        # TODO: Implement actual input register read
        # result = self._client.read_input_registers(
        #     address=address, count=count, slave=self._unit_id
        # )
        # if result.isError():
        #     raise RuntimeError(f"Modbus read error: {result}")
        # return result.registers

        return [0] * count

    def write_register(self, address: int, value: int) -> None:
        """Write a single holding register (function code 06).

        Args:
            address: Register address to write.
            value: Value to write (0-65535).

        Raises:
            RuntimeError: If not connected.
        """
        if not self._is_connected:
            raise RuntimeError("Not connected. Call connect() first.")

        logger.debug(f"Writing value {value} to register {address}")

        # TODO: Implement actual register write
        # result = self._client.write_register(
        #     address=address, value=value, slave=self._unit_id
        # )
        # if result.isError():
        #     raise RuntimeError(f"Modbus write error: {result}")

    def write_registers(self, address: int, values: list[int]) -> None:
        """Write multiple holding registers (function code 16).

        Args:
            address: Starting register address.
            values: List of values to write.

        Raises:
            RuntimeError: If not connected.
        """
        if not self._is_connected:
            raise RuntimeError("Not connected. Call connect() first.")

        logger.debug(f"Writing {len(values)} register(s) starting at address {address}")

        # TODO: Implement actual multiple register write
        # result = self._client.write_registers(
        #     address=address, values=values, slave=self._unit_id
        # )
        # if result.isError():
        #     raise RuntimeError(f"Modbus write error: {result}")

    def read_coils(self, address: int, count: int = 1) -> list[bool]:
        """Read coils (function code 01).

        Args:
            address: Starting coil address.
            count: Number of coils to read.

        Returns:
            List of coil states (True/False).

        Raises:
            RuntimeError: If not connected.
        """
        if not self._is_connected:
            raise RuntimeError("Not connected. Call connect() first.")

        logger.debug(f"Reading {count} coil(s) from address {address}")

        # TODO: Implement actual coil read
        # result = self._client.read_coils(
        #     address=address, count=count, slave=self._unit_id
        # )
        # if result.isError():
        #     raise RuntimeError(f"Modbus read error: {result}")
        # return result.bits[:count]

        return [False] * count

    def write_coil(self, address: int, value: bool) -> None:
        """Write a single coil (function code 05).

        Args:
            address: Coil address to write.
            value: Coil state (True for ON, False for OFF).

        Raises:
            RuntimeError: If not connected.
        """
        if not self._is_connected:
            raise RuntimeError("Not connected. Call connect() first.")

        logger.debug(f"Writing coil {address} = {value}")

        # TODO: Implement actual coil write
        # result = self._client.write_coil(
        #     address=address, value=value, slave=self._unit_id
        # )
        # if result.isError():
        #     raise RuntimeError(f"Modbus write error: {result}")
