"""Hottis Wago Modbus vendor transformations."""

import logging
from typing import Any

logger = logging.getLogger(__name__)

def transform_relay_to_vendor(payload: dict[str, Any]) -> str:
    """Transform abstract relay payload to Hottis Wago Modbus format.
    
    Hottis Wago Modbus expects plain text 'true' or 'false' (not JSON).
    
    Example:
    - Abstract: {'power': 'on'}
    - Hottis Wago Modbus: 'true' or 'false'
    """
    power = payload.get("power", "off")

    # Map abstract "on"/"off" to vendor "true"/"false"
    if isinstance(power, str):
        power_lower = power.lower()
        if power_lower in {"on", "true", "1"}:
            return "true"
        if power_lower in {"off", "false", "0"}:
            return "false"

    # Fallback: any truthy value -> "true", else "false"
    return "true" if power else "false"


def transform_relay_to_abstract(payload: str) -> dict[str, Any]:
    """Transform Hottis Wago Modbus relay payload to abstract format.
    
    Hottis Wago Modbus sends plain text 'true' or 'false'.
    
    Example:
    - Hottis Wago Modbus: 'true'
    - Abstract: {'power': 'on'}
    """
    value = payload.strip().lower()

    if value == "true":
        power = "on"
    elif value == "false":
        power = "off"
    else:
        # Fallback for unexpected values: keep as-is
        logger.warning("Unexpected relay payload from Hottis Wago Modbus: %r", payload)
        power = value

    return {"power": power}


# Registry of handlers for this vendor
HANDLERS = {
    ("relay", "to_vendor"): transform_relay_to_vendor,
    ("relay", "to_abstract"): transform_relay_to_abstract,
}