"""MAX! (Homegear) vendor transformations."""

import json
import logging
from typing import Any

logger = logging.getLogger(__name__)


def transform_contact_sensor_to_vendor(payload: dict[str, Any]) -> str:
    """Transform abstract contact sensor payload to MAX! format.
    
    Contact sensors are read-only.
    """
    logger.warning("Contact sensors are read-only - SET commands should not be used")
    return json.dumps(payload)


def transform_contact_sensor_to_abstract(payload: str) -> dict[str, Any]:
    """Transform MAX! contact sensor payload to abstract format.
    
    MAX! sends "true"/"false" (string or bool) on STATE topic.
    
    Transformations:
    - "true" or True -> "open" (window/door open)
    - "false" or False -> "closed" (window/door closed)
    
    Example:
    - MAX!: "true"
    - Abstract: {"contact": "open"}
    """
    try:
        contact_value = payload.strip().lower() == "true"
        return {
            "contact": "open" if contact_value else "closed"
        }
    except (ValueError, TypeError) as e:
        logger.error(f"MAX! contact sensor failed to parse: {payload}, error: {e}")
        return {"contact": "closed"}


def transform_thermostat_to_vendor(payload: dict[str, Any]) -> str:
    """Transform abstract thermostat payload to MAX! format.
    
    MAX! expects only the integer temperature value (no JSON).
    
    Transformations:
    - Extract 'target' temperature from payload
    - Convert float to integer
    - Return as plain string value
    
    Example:
    - Abstract: {'target': 22.5}
    - MAX!: "22"
    """
    if "target" not in payload:
        logger.warning(f"MAX! thermostat payload missing 'target': {payload}")
        return "21"
    
    target_temp = payload["target"]
    
    if isinstance(target_temp, (int, float)):
        int_temp = int(round(target_temp))
        return str(int_temp)
    
    logger.warning(f"MAX! invalid target temperature type: {type(target_temp)}")
    return "21"


def transform_thermostat_to_abstract(payload: str) -> dict[str, Any]:
    """Transform MAX! thermostat payload to abstract format.
    
    MAX! sends only the integer temperature value (no JSON).
    
    Example:
    - MAX!: "22"
    - Abstract: {'target': 22.0, 'mode': 'heat'}
    """
    target_temp = float(payload.strip())
    
    return {
        "target": target_temp,
        "mode": "heat"
    }


# Registry of handlers for this vendor
HANDLERS = {
    ("contact_sensor", "to_vendor"): transform_contact_sensor_to_vendor,
    ("contact_sensor", "to_abstract"): transform_contact_sensor_to_abstract,
    ("contact", "to_vendor"): transform_contact_sensor_to_vendor,
    ("contact", "to_abstract"): transform_contact_sensor_to_abstract,
    ("thermostat", "to_vendor"): transform_thermostat_to_vendor,
    ("thermostat", "to_abstract"): transform_thermostat_to_abstract,
}