import time
import threading
import subprocess
from pylinphone.pylinphone import LinphoneCommunicationSocket


class PhoneProxyConfiguration(object):
    def __init__(self, name, proxy, identity, username, password, realm,
                 prefix):
        self.name = name
        self.proxy = proxy
        self.identity = identity
        self.username = username
        self.password = password
        self.realm = realm
        self.prefix = prefix


class PhoneConfiguration(object):
    def __init__(self, sound_device, incoming_timeout, linphone_config,
                 default_proxy, proxies, stun_server):
        self.sound_device = sound_device
        self.incoming_timeout = incoming_timeout
        self.linphone_config = linphone_config
        self.default_proxy = default_proxy
        self.proxies = proxies
        self.stun_server = stun_server


class PhoneEvent(object):
    RegInProgress,\
    RegSuccessfull,\
    RegLost,\
    CallIncoming,\
    CallRinging,\
    CallAccepted,\
    CallEnded,\
    CallBusy,\
    CallInvalidNumber = range(9)

    @classmethod
    def string(cls, val):
        for k, v in vars(cls).items():
            if v == val:
                return k


class PhoneInterface(object):
    def __init__(self, config):
        self.__event_cbs = []

        self.__config = config
        self.__core = LinphoneCommunicationSocket("/var/tmp/debian-sid/tmp/linphone")

        self.__core.onLinphoneCallIncomingReceived = self.on_LinphoneCallIncomingReceived
        self.__core.onLinphoneCallOutgoingRinging = self.on_LinphoneCallOutgoingRinging
        self.__core.onLinphoneCallConnected = self.on_LinphoneCallConnected
        self.__core.onLinphoneCallEnd = self.on_LinphoneCallEnd

        # Create and add all proxy configs
        for p in config.proxies:
            aid = self.__core.register(p.identity, p.proxy, p.password, p.username) # sip:XXXX@hg.eventphone.de, hg.eventphone.de, MySecretPassword, XXXX

        self.__audioproc = None
        aplay = subprocess.Popen(['aplay', '-qD%s' % config.sound_device],
                                 stdin=subprocess.PIPE)
        self.__ttsproc = subprocess.Popen(['espeak', '-p10', '--stdout'],
                                          stdin=subprocess.PIPE,
                                          stdout=aplay.stdin)

        self.current_call_id = None

        # Set default parameters overriding the ones from the given config file
        # TODO: figure out how to set at least some of these settings through the unix socket
        #self.__core.set_user_agent('FeTAp 615', '0.1')
        #self.__core.stun_server = config.stun_server
        #self.__core.ringback = ''
        #self.__core.max_calls = 1
        #self.__core.inc_timeout = config.incoming_timeout
        #self.__core.set_call_error_tone(linphone.Reason.Busy, '')
        #self.__core.disable_chat(linphone.Reason.None)
        #self.__core.echo_cancellation_enabled = False
        #self.__core.video_capture_enabled = False
        #self.__core.video_display_enabled = False


    def run_callbacks(self, evt):
        print(PhoneEvent.string(evt))
        for cb in self.__event_cbs:
            cb(evt)

    def on_LinphoneCallIncomingReceived(self, event):
        self.run_callbacks(PhoneEvent.CallIncoming)
        self.current_call_id = event.call_id

    def on_LinphoneCallOutgoingRinging(self, event):
        self.run_callbacks(PhoneEvent.CallRinging)

    def on_LinphoneCallConnected(self, event):
        self.run_callbacks(PhoneEvent.CallAccepted)

    def on_LinphoneCallEnd(self, event):
        self.run_callbacks(PhoneEvent.CallEnded)
        self.current_call_id = None

    def __pollthread(self):
        while self.__running:
            self.__core.process_event()
            time.sleep(0.2) # Value for good measure

    def start(self):
        self.__running = True
        t = threading.Thread(target=self.__pollthread)
        t.start()

    def stop(self):
        self.stop_playing()
        if self.__ttsproc is not None:
            self.__ttsproc.terminate()
        self.__running = False

    def add_event_cb(self, cb):
        self.__event_cbs.append(cb)

    def call(self, number):
        if '@' not in number:
            proxy = None
            default_name = self.__config.default_proxy
            for p in self.__config.proxies:
                if p.name == default_name:
                    proxy = p
                    break
            if proxy is None:
                # Try to resolve prefix
                for p in self.__config.proxies:
                    if number.startswith(p.prefix):
                        number = number[len(p.prefix):]
                        proxy = p
                        break
            if proxy is not None:
                number += '@' + proxy.realm
        self.__core.call(number)

    def accept_call(self):
        self.__core.answer()

    def decline_call(self):
        self.__core.decline_call(self.__core.current_call)

    def end_call(self):
        self.__core.terminate()

    def play_dial_tone(self):
        self.stop_playing()
        self.__audioproc = subprocess.Popen(
            ['play', '-nq', 'synth', 'sine', '425'],
            env={'AUDIODRIVER': 'alsa', 'AUDIODEV': self.__config.sound_device}
        )

    def play_ringback_tone(self):
        self.stop_playing()
        self.__audioproc = subprocess.Popen(
            ['play', '-nq', 'synth', '1', 'sine', '425', 'pad', '4@1',
             'repeat', '1000'],
            env={'AUDIODRIVER': 'alsa', 'AUDIODEV': self.__config.sound_device}
        )

    def play_busy_tone(self):
        self.stop_playing()
        self.__audioproc = subprocess.Popen(
            ['play', '-nq', 'synth', '0.48', 'sine', '425', 'pad', '0.48@0.48',
             'repeat', '1000'],
            env={'AUDIODRIVER': 'alsa', 'AUDIODEV': self.__config.sound_device}
        )

    def stop_playing(self):
        if self.__audioproc is not None:
            self.__audioproc.terminate()

    def read_text(self, text):
        self.__ttsproc.stdin.write(text.encode('utf8') + b'\n')
        self.__ttsproc.stdin.flush()

    def get_remote_number(self):
        if self.current_call_id != None:
            status = self.__core.call_status(self.current_call_id)
            return status.get("from")

if __name__ == '__main__':
    def event_cb(evt):
        print('Got event:', PhoneEvent.string(evt))

    try:
        phone = PhoneInterface('.linphonerc-foo', '.linphonerc')
        phone.add_event_cb(event_cb)
        phone.start()
        i = 0
        while True:
            time.sleep(1)
            i += 1
            if i == 5:
                phone.call('3474')
                #phone.play_busy_tone()
                pass
    except KeyboardInterrupt:
        phone.stop()