# new sync refactor:
from core.services.sync.sync_service import coordinate_cache_sync
from core.errors.logger import logger
# prior versions:
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.OperatorController import OperatorController
from core.controllers.SubscriptionPlanController import SubscriptionPlanController
from core.observers.ClientObserver 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.models.manage.session_management import init_session, close_session

        # Use Cached Method:
        init_session()
        result = coordinate_cache_sync(ClientObserver, ConnectionObserver)

        logger.info(f"We got a Result from the API of {result}")

        close_session()

        # Outright Error:
        if not result["success"]:
            error_msg = result["error"]
            if client_observer is not None:
                client_observer.notify('synchronizing', f'Error! {error_msg}')
                return

        # Same:
        changed_tables = result["changed_tables"]
        if not changed_tables:
            if client_observer is not None:
                client_observer.notify('synchronized')
                return

        # We only make it past this point if there's New Data

        # Fetch and update those models...
        try:
            from core.controllers.ConnectionController import ConnectionController
            ConnectionController.with_preferred_connection(task=ClientController.__sync, changed_tables=changed_tables, client_observer=client_observer, connection_observer=connection_observer)
        except:
            # sync failed here,
            if client_observer is not None:
                client_observer.notify('synchronizing', 'Error! Sync Failed.')

    @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(changed_tables: list, client_observer: Optional[ClientObserver] = None, proxies: Optional[dict] = None):

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

        if "applications" in changed_tables:
            logger.info("Sync applications..")
            if client_observer is not None:
                client_observer.notify('synchronizing', 'Fetching Browser List')
            # noinspection PyProtectedMember
            ApplicationController._sync(proxies=proxies)

        if "application_versions" in changed_tables:
            logger.info("Sync Application Versions..")
            if client_observer is not None:
                client_observer.notify('synchronizing', 'Fetching Browser Version List')
            # noinspection PyProtectedMember
            ApplicationVersionController._sync(proxies=proxies)

        if "client_version" in changed_tables:
            logger.info("Sync of client version")
            if client_observer is not None:
                client_observer.notify('synchronizing', 'Fetching Client Version List')
            # noinspection PyProtectedMember
            ClientVersionController._sync(proxies=proxies)

        if "operators" in changed_tables:
            logger.info("Sync of Operators")
            if client_observer is not None:
                client_observer.notify('synchronizing', 'Fetching Operators List')
            # noinspection PyProtectedMember
            OperatorController._sync(proxies=proxies)

        if "locations" in changed_tables:
            logger.info("Sync of Locations")
            if client_observer is not None:
                client_observer.notify('synchronizing', 'Fetching Locations List')
            # noinspection PyProtectedMember
            LocationController._sync(proxies=proxies)

        if "subscriptions" in changed_tables:
            logger.info("Sync of Subscriptions")
            if client_observer is not None:
                client_observer.notify('synchronizing', 'Fetching Subscription List')
            # noinspection PyProtectedMember
            SubscriptionPlanController._sync(proxies=proxies)

        ConfigurationController.update_last_synced_at()

        logger.info("Entire Sync Completed Successfully")
        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')