"""
Contact Sensor Accessory Implementation for HomeKit

Implements contact sensor (window/door sensors):
- ContactSensorState (read-only): 0=Detected, 1=Not Detected
"""

from pyhap.accessory import Accessory
from pyhap.const import CATEGORY_SENSOR


class ContactAccessory(Accessory):
    """Contact sensor for doors and windows."""
    
    category = CATEGORY_SENSOR
    
    def __init__(self, driver, device, api_client, display_name=None, *args, **kwargs):
        """
        Initialize the contact sensor accessory.
        
        Args:
            driver: HAP driver instance
            device: Device object from DeviceRegistry
            api_client: ApiClient for sending commands
            display_name: Optional display name (defaults to device.friendly_name)
        """
        name = display_name or device.friendly_name or device.name
        super().__init__(driver, name, *args, **kwargs)
        self.device = device
        self.api_client = api_client
        
        # Add ContactSensor service
        self.contact_service = self.add_preload_service('ContactSensor')
        
        # Get ContactSensorState characteristic
        self.contact_state_char = self.contact_service.get_characteristic('ContactSensorState')
        
        # Initialize with "not detected" (closed)
        self.contact_state_char.set_value(1)
    
    def update_state(self, state_payload):
        """Update state from API event."""
        if "contact" in state_payload:
            # API sends: "open" or "closed"
            # HomeKit: 0=Contact Detected (closed), 1=Contact Not Detected (open)
            is_open = state_payload["contact"] == "open"
            homekit_state = 1 if is_open else 0
            self.contact_state_char.set_value(homekit_state)