#!/usr/bin/env python3
# vim: ts=2 sw=2 et

import grp
import json
import os
import signal
import stat
import subprocess
import sys
import threading
import time
from configparser import ConfigParser
from dataclasses import dataclass

import paho.mqtt.client as mqtt
import pifacedigitalio


class FoodoorMQTT:
    def __init__(self, area):
        self.area = area
        self.client = mqtt.Client()
        self.client.on_connect = self.on_connect
        self.client.on_message = self.on_message

        self._connect_lock = threading.Condition()

    def connect(self):
        try:
            self.client.connect("mqtt.chaospott.de")
            self.client.loop_start()
            with self._connect_lock:
                self._connect_lock.wait()
        except Exception as e:
            print(f"Verbindungsfehler zu MQTT-Server: {e}")

    def disconnect(self):
        self.client.loop_stop()

    def on_connect(self, client, userdata, flags, rc):
        with self._connect_lock:
            self._connect_lock.notify()

    def on_message(self, client, userdata, msg):
        print(f"MQTT-Server Message: {msg.topic} {msg.payload}")

    def send_state(self, locked: bool):
        self.client.publish(f"foobar/{self.area}/foodoor/status", {
            False: "open",
            True: "closed",
        }[locked], qos=0, retain=True)


# Read config
parser = ConfigParser()
parser.read('/etc/foodoord.conf')


@dataclass
class API:
    location: str
    api_url: str
    consumer_key: str
    consumer_secret: str

    def update_state(self, locked):
        subprocess.check_call([
            "/usr/bin/curl", "-XPOST",
            "--header", "Content-Type: application/json",
            "--data",
            json.dumps({"consumer_key": self.consumer_key, "consumer_secret": self.consumer_secret, self.location: locked}),
            self.api_url
        ])


APIv1 = API("aerie",
    parser.get('doorstatus', 'status_url'),
    parser.get('doorstatus', 'key'),
    parser.get('doorstatus', 'secret'),
)
APIv2 = API("aerie",
    parser.get('doorstatusv2', 'status_url'),
    parser.get('doorstatusv2', 'key'),
    parser.get('doorstatusv2', 'secret'),
)


class Foodoord:
    # Definitions for LED color
    RED = 0b1
    GREEN = 0b10
    ORANGE = RED | GREEN

    # Definitions for output
    LEDS = {
        RED: 6,
        GREEN: 7,
    }
    RELAYS_LOCK = 0
    RELAYS_UNLOCK = 1

    # Definitions for input
    DOOR_BELL = 0
    CLOSE_BUTTON = 1

    def __init__(self):
        self.status_open = False
        self.mqtt = FoodoorMQTT("oben")

        self.listener = pifacedigitalio.InputEventListener()
        self.listener.register(self.DOOR_BELL, pifacedigitalio.IODIR_RISING_EDGE, self.doorbell, settle_time=10)
        self.listener.register(self.CLOSE_BUTTON, pifacedigitalio.IODIR_RISING_EDGE, self.close_button, settle_time=5)

    def signal_handler(self, _signal, _frame):
        self.listener.deactivate()
        os.remove("/var/run/foodoord.pipe")

        self.update_api(True)
        self.set_led(self.RED)
        sys.exit(0)

    def update_api(self, locked):
        try:
            self.mqtt.send_state(locked)
        except:
            pass
        try:
            APIv1.update_state(locked)
        except:
            pass
        try:
            APIv2.update_state(locked)
        except:
            pass

    def set_led(self, color):
        for led, gpio in self.LEDS.items():
            if color & led:
                pifacedigital.leds[gpio].turn_on()
            else:
                pifacedigital.leds[gpio].turn_off()

    def doorbell(self, event):
        if self.status_open:
            pifacedigital.relays[self.RELAYS_UNLOCK].toggle()
            time.sleep(2)
            pifacedigital.relays[self.RELAYS_UNLOCK].toggle()

    def close_button(self, _event):
        self.status_open = False
        self.update_api(True)
        self.set_led(self.RED)

    def main(self):
        self.mqtt.connect()
        self.listener.activate()

        pifacedigital = pifacedigitalio.PiFaceDigital()
        signal.signal(signal.SIGTERM, self.signal_handler)

        # Start settings
        self.set_led(self.RED)

        # Setting up FiFo to get sshd-output
        try:
            os.mkfifo("/var/run/foodoord.pipe")
            os.chown("/var/run/foodoord.pipe", -1, grp.getgrnam('foodoor')[2])
            os.chmod("/var/run/foodoord.pipe", stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IWGRP)
        except OSError:
            pass

        ssh_input = open("/var/run/foodoord.pipe", "r")
        while True:
            # Read sshd-output from pipe
            pipe_cmd = ssh_input.readline().strip()

            if pipe_cmd == "close" and self.status_open:
                pifacedigital.relays[self.RELAYS_LOCK].toggle()
                time.sleep(1)
                pifacedigital.relays[self.RELAYS_LOCK].toggle()

                self.status_open = False
                self.update_api(True)
                self.set_led(self.RED)

            elif pipe_cmd == "open":
                pifacedigital.relays[self.RELAYS_UNLOCK].toggle()
                time.sleep(2)
                pifacedigital.relays[self.RELAYS_UNLOCK].toggle()

                if not self.status_open:
                    self.update_api(False)
                self.status_open = True
                self.set_led(self.GREEN)

            time.sleep(0.1)


if __name__ == "__main__":
    Foodoord().main()