from core.Constants import Constants
from core.Errors import UnknownClientPathError, UnknownClientVersionError, CommandNotFoundError
from core.controllers.ApplicationController import ApplicationController
from core.controllers.ApplicationVersionController import ApplicationVersionController
from core.controllers.ClientVersionController import ClientVersionController
from core.controllers.ConfigurationController import ConfigurationController
from core.controllers.LocationController import LocationController
from core.controllers.SubscriptionPlanController import SubscriptionPlanController
from core.observers import ClientObserver
from core.observers.ConnectionObserver import ConnectionObserver
from typing import Optional
import os
import pathlib
import re
import shutil
import subprocess


class ClientController:

    @staticmethod
    def get_working_directory():
        return str(pathlib.Path(__file__).resolve().parent.parent.parent)

    @staticmethod
    def get_version():

        if (version_number := Constants.HV_CLIENT_VERSION_NUMBER) is None:
            raise UnknownClientVersionError('The client version could not be determined.')

        return ClientVersionController.get_or_new(version_number)

    @staticmethod
    def can_be_updated():

        try:
            version = ClientController.get_version()
        except UnknownClientVersionError:
            return False

        return not ClientVersionController.is_latest(version)

    @staticmethod
    def sync(client_observer: ClientObserver = None, connection_observer: ConnectionObserver = None):

        from core.controllers.ConnectionController import ConnectionController
        ConnectionController.with_preferred_connection(task=ClientController.__sync, client_observer=client_observer, connection_observer=connection_observer)

    @staticmethod
    def update(client_observer: ClientObserver = None, connection_observer: ConnectionObserver = None):

        from core.controllers.ConnectionController import ConnectionController
        ConnectionController.with_preferred_connection(task=ClientController.__update, client_observer=client_observer, connection_observer=connection_observer)

    @staticmethod
    def __get_path():

        if (path := Constants.HV_CLIENT_PATH) is None:
            raise UnknownClientPathError('The client path could not be determined.')

        return path

    @staticmethod
    def __sync(client_observer: Optional[ClientObserver] = None, proxies: Optional[dict] = None):

        if client_observer is not None:
            client_observer.notify('synchronizing')

        # noinspection PyProtectedMember
        ApplicationController._sync(proxies=proxies)
        # noinspection PyProtectedMember
        ApplicationVersionController._sync(proxies=proxies)
        # noinspection PyProtectedMember
        ClientVersionController._sync(proxies=proxies)
        # noinspection PyProtectedMember
        LocationController._sync(proxies=proxies)
        # noinspection PyProtectedMember
        SubscriptionPlanController._sync(proxies=proxies)

        ConfigurationController.update_last_synced_at()

        if client_observer is not None:
            client_observer.notify('synchronized')

    @staticmethod

    def __update(client_observer: Optional[ClientObserver] = None, proxies: Optional[dict] = None):

        if ClientController.can_be_updated():

            if client_observer is not None:
                client_observer.notify('updating')

            client_path = ClientController.__get_path()
            update_environment = os.environ.copy()

            if proxies is not None:
                update_environment | dict(http_proxy=proxies['http'], https_proxy=proxies['https'])

            if shutil.which('hv-updater') is None:
                raise CommandNotFoundError('hv-updater')

            process = subprocess.Popen(('hv-updater', '--overwrite', '--remove-old', client_path), env=update_environment, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, universal_newlines=True)
            highest_reported_progress = 0

            for line in iter(process.stdout.readline, ''):

                match = re.search(r'(\d+\.\d+)%', line)

                if match and (progress := float(match.group(1))) > highest_reported_progress:

                    highest_reported_progress = progress

                    if client_observer is not None:

                        client_observer.notify('update_progressing', None, dict(
                            progress=progress
                        ))

            if client_observer is not None:
                client_observer.notify('updated')