import subprocess
import socket

NO_CALL = 0
INCOMING_CALL = 1
OUTGOING_CALL = 2
OP_CALL = 'CALL'.encode()
OP_HANG = 'HANG'.encode()
OP_PING = 'PING'.encode()
OP_OK = 'OK'.encode()
OP_ERROR = 'ERROR'.encode()

class CallManager:
    def __init__(self, config):
        self.config = config
        self.state = NO_CALL
        self.station = None
        self.call_process = None

    def call(self, station):
        try:
            self.call_process = subprocess.Popen(['parole', '-c', station['host'], '-d', self.config['audio device']])
            s = socket.socket()
            s.connect((station['host'], station['port']))
            s.send(OP_CALL)
            response = s.recv(1024)
            print('Call notice sent', 'response=', response.decode())
            s.close()
            self.state = OUTGOING_CALL
            self.station = station
            station['red'].on()
        except Exception as e:
            print('Error al realizar la llamada: ', e)
            station['green'].off()
            self.call_process.terminate()
            self.call_process.communicate()

    def incoming_call(self, station):
        self.state = INCOMING_CALL
        self.station = station
        station['red'].on()

    def hang(self):
        print('Hang! self.station', self.station)
        if self.station is not None:
            self.station['red'].off()
        if self.call_process is not None:
            self.call_process.terminate()
            self.call_process.communicate()
        self.state = NO_CALL
        self.station = None

    def notify_hang(self):
        if self.station is not None:
            s = socket.socket()
            s.connect((self.station['host'], self.station['port']))
            s.send(OP_HANG)
            response = s.recv(1024)
            print('Hang notify sent', 'response=', response.decode())
            s.close()