from argparse import Namespace
from typing import List, Dict

from fpakman_api.abstract.controller import ApplicationManager
from fpakman_api.abstract.model import Application, ApplicationUpdate
from fpakman_api.util.disk import DiskCacheLoader
from fpakman_api.util.disk import DiskCacheLoaderFactory
from fpakman_api.util.system import FpakmanProcess

from fpakman import ROOT_DIR


class GenericApplicationManager(ApplicationManager):

    def __init__(self, managers: List[ApplicationManager], disk_loader_factory: DiskCacheLoaderFactory, app_args: Namespace):
        super(GenericApplicationManager, self).__init__(app_args=app_args, app_cache=None, locale_keys=None, fpakman_root_dir=ROOT_DIR, http_session=None)
        self.managers = managers
        self.map = {m.get_app_type(): m for m in self.managers}
        self.disk_loader_factory = disk_loader_factory
        self._enabled_map = {} if app_args.check_packaging_once else None
        self.prepare()

    def _sort(self, apps: List[Application], word: str) -> List[Application]:

        exact_name_matches, contains_name_matches, others = [], [], []

        for app in apps:
            lower_name = app.base_data.name.lower()

            if word == lower_name:
                exact_name_matches.append(app)
            elif word in lower_name:
                contains_name_matches.append(app)
            else:
                others.append(app)

        res = []
        for app_list in (exact_name_matches, contains_name_matches, others):
            app_list.sort(key=lambda a: a.base_data.name.lower())
            res.extend(app_list)

        return res

    def _is_enabled(self, man: ApplicationManager):

        if self._enabled_map is not None:
            enabled = self._enabled_map.get(man.get_app_type())

            if enabled is None:
                enabled = man.is_enabled()
                self._enabled_map[man.get_app_type()] = enabled

            return enabled
        else:
            return man.is_enabled()

    def search(self, word: str, disk_loader: DiskCacheLoader = None) -> Dict[str, List[Application]]:
        res = {'installed': [], 'new': []}

        norm_word = word.strip().lower()
        disk_loader = None

        for man in self.managers:
            if self._is_enabled(man):
                if not disk_loader:
                    disk_loader = self.disk_loader_factory.new()
                    disk_loader.start()

                apps_found = man.search(words=norm_word, disk_loader=disk_loader)
                res['installed'].extend(apps_found['installed'])
                res['new'].extend(apps_found['new'])

        if disk_loader:
            disk_loader.stop = True
            disk_loader.join()

        for key in res:
            res[key] = self._sort(res[key], norm_word)

        return res

    def read_installed(self, disk_loader: DiskCacheLoader = None) -> List[Application]:
        installed = []

        disk_loader = None

        for man in self.managers:
            if self._is_enabled(man):
                if not disk_loader:
                    disk_loader = self.disk_loader_factory.new()
                    disk_loader.start()

                installed.extend(man.read_installed(disk_loader=disk_loader))

        if disk_loader:
            disk_loader.stop = True
            disk_loader.join()

        installed.sort(key=lambda a: a.base_data.name.lower())

        return installed

    def can_downgrade(self):
        return True

    def downgrade_app(self, app: Application, root_password: str) -> FpakmanProcess:
        man = self._get_manager_for(app)

        if man and app.can_be_downgraded():
            return man.downgrade_app(app, root_password)
        else:
            raise Exception("downgrade is not possible for {}".format(app.__class__.__name__))

    def clean_cache_for(self, app: Application):
        man = self._get_manager_for(app)

        if man:
            return man.clean_cache_for(app)

    def update(self, app: Application, root_password: str) -> FpakmanProcess:
        man = self._get_manager_for(app)

        if man:
            return man.update(app, root_password)

    def uninstall(self, app: Application, root_password: str) -> FpakmanProcess:
        man = self._get_manager_for(app)

        if man:
            return man.uninstall(app, root_password)

    def install(self, app: Application, root_password: str) -> FpakmanProcess:
        man = self._get_manager_for(app)

        if man:
            return man.install(app, root_password)

    def get_info(self, app: Application):
        man = self._get_manager_for(app)

        if man:
            return man.get_info(app)

    def get_history(self, app: Application):
        man = self._get_manager_for(app)

        if man:
            return man.get_history(app)

    def get_app_type(self):
        return None

    def is_enabled(self):
        return True

    def _get_manager_for(self, app: Application) -> ApplicationManager:
        man = self.map[app.__class__]
        return man if man and self._is_enabled(man) else None

    def cache_to_disk(self, app: Application, icon_bytes: bytes, only_icon: bool):
        if self.disk_loader_factory.disk_cache and app.supports_disk_cache():
            man = self._get_manager_for(app)

            if man:
                return man.cache_to_disk(app, icon_bytes=icon_bytes, only_icon=only_icon)

    def requires_root(self, action: str, app: Application):
        man = self._get_manager_for(app)

        if man:
            return man.requires_root(action, app)

    def refresh(self, app: Application, root_password: str) -> FpakmanProcess:
        man = self._get_manager_for(app)

        if man:
            return man.refresh(app, root_password)

    def prepare(self):
        if self.managers:
            for man in self.managers:
                if self._is_enabled(man):
                    man.prepare()

    def list_updates(self) -> List[ApplicationUpdate]:
        updates = []

        if self.managers:
            for man in self.managers:
                if self._is_enabled(man):
                    updates.extend(man.list_updates())

        return updates

    def list_warnings(self) -> List[str]:
        if self.managers:
            warnings = None

            for man in self.managers:
                man_warnings = man.list_warnings()

                if man_warnings:
                    if warnings is None:
                        warnings = []

                    warnings.extend(man_warnings)

            return warnings