#!/usr/bin/env python3
import logging
import subprocess
from enocean.communicators.serialcommunicator import SerialCommunicator

# -----------------------------
# Konfiguration
# -----------------------------

# -----------------------------
# EnOcean 
# -----------------------------
ENOCEAN_PORT = "/dev/ttyS4"
SENDER_ID = "FE:D0:A6:44"

# -----------------------------
# KNXD
# -----------------------------
KNXD_IP = "ip:172.20.21.168"
GA_FRONT = "11/1/14"
GA_REAR  = "11/1/15"

# -----------------------------
# Logging
# -----------------------------

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s %(levelname)s: %(message)s"
)

log = logging.getLogger("enocean-knx")


# -----------------------------
# KNX Senden über knxd
# -----------------------------

def knx_write(ip: str, ga: str, state: bool):
    """
    Sendet Boolean an KNX über knxd (groupswrite).
    """
    value = "1" if state else "0"

    try:
        subprocess.run(
            ["/usr/lib/knxd/groupswrite", ip, ga, value],
            check=True,
            stdout=subprocess.DEVNULL,
            stderr=subprocess.DEVNULL
        )
        log.info(f"KNX → {ga} = {value}")

    except Exception as e:
        log.error(f"KNX send failed: {e}")


# -----------------------------
# EnOcean Verarbeitung
# -----------------------------

last_button = None  # "front" | "rear"


def process_packet(packet):
    global last_button

    try:
        sender = packet.sender_hex

        if sender != SENDER_ID:
            return

        # Rohdaten
        data = packet.data

        if not data:
            return

        event = data[1]

        # -------------------------
        # Fronttür (Button BO)
        # -------------------------
        if event == 0x70:
            last_button = "front"
            knx_write(KNXD_IP, GA_FRONT, True)
            log.info("Front door OPEN")

        elif event == 0x00 and last_button == "front":
            knx_write(KNXD_IP, GA_FRONT, False)
            log.info("Front door CLOSED")

        # -------------------------
        # Hecktür (Button BI)
        # -------------------------
        elif event == 0x50:
            last_button = "rear"
            knx_write(KNXD_IP, GA_REAR, True)
            log.info("Rear door OPEN")

        elif event == 0x00 and last_button == "rear":
            knx_write(KNXD_IP, GA_REAR, False)
            log.info("Rear door CLOSED")

    except Exception as e:
        log.error(f"Packet error: {e}")


# -----------------------------
# Main Loop
# -----------------------------

def main():
    log.info("Starting EnOcean → KNX gateway")

    communicator = SerialCommunicator(port=ENOCEAN_PORT)
    communicator.start()

    try:
        while True:
            packet = communicator.receive.get()
            process_packet(packet)

    except KeyboardInterrupt:
        log.info("Stopping gateway")

    finally:
        communicator.stop()


if __name__ == "__main__":
    main()