import time
from datetime import datetime, timedelta
from typing import List

from PyQt5.QtCore import QThread, pyqtSignal

from fpakman.core import flatpak
from fpakman.core.controller import FlatpakManager
from fpakman.core.model import ApplicationStatus, FlatpakApplication
from fpakman.util.cache import Cache
from fpakman.view.qt import dialog
from fpakman.view.qt.view_model import ApplicationView, ApplicationViewStatus


class UpdateSelectedApps(QThread):

    signal_finished = pyqtSignal()
    signal_output = pyqtSignal(str)

    def __init__(self):
        super(UpdateSelectedApps, self).__init__()
        self.refs_to_update = []

    def run(self):

        for app_ref in self.refs_to_update:
            for output in flatpak.update_and_stream(app_ref):
                line = output.decode().strip()
                if line:
                    self.signal_output.emit(line)

        self.signal_finished.emit()


class RefreshApps(QThread):

    signal = pyqtSignal(list)

    def __init__(self, manager: FlatpakManager):
        super(RefreshApps, self).__init__()
        self.manager = manager

    def run(self):
        self.signal.emit(self.manager.read_installed())


class UninstallApp(QThread):
    signal_finished = pyqtSignal()
    signal_output = pyqtSignal(str)

    def __init__(self, manager: FlatpakManager, icon_cache: Cache, app: ApplicationView = None):
        super(UninstallApp, self).__init__()
        self.app = app
        self.manager = manager
        self.icon_cache = icon_cache

    def run(self):
        if self.app and isinstance(self.app.model, FlatpakApplication):
            for output in flatpak.uninstall_and_stream(self.app.model.ref):
                line = output.decode().strip()
                if line:
                    self.signal_output.emit(line)

            self.icon_cache.delete(self.app.model.base_data.icon_url)
            self.manager.clean_cache_for(self.app.model.base_data.id)
            self.signal_finished.emit()


class DowngradeApp(QThread):
    signal_finished = pyqtSignal()
    signal_output = pyqtSignal(str)

    def __init__(self, manager: FlatpakManager, locale_keys: dict, app: ApplicationView = None):
        super(DowngradeApp, self).__init__()
        self.manager = manager
        self.app = app
        self.locale_keys = locale_keys
        self.root_password = None

    def run(self):
        if self.app and isinstance(self.app.model, FlatpakApplication):

            stream = self.manager.downgrade_app(self.app.model, self.root_password)

            if stream is None:
                dialog.show_error(title=self.locale_keys['popup.downgrade.impossible.title'],
                                  body=self.locale_keys['popup.downgrade.impossible.body'])
            else:
                for output in self.manager.downgrade_app(self.app.model, self.root_password):
                    line = output.decode().strip()
                    if line:
                        self.signal_output.emit(line)

            self.app = None
            self.root_password = None
            self.signal_finished.emit()


class GetAppInfo(QThread):
    signal_finished = pyqtSignal(dict)

    def __init__(self, app: ApplicationView = None):
        super(GetAppInfo, self).__init__()
        self.app = app

    def run(self):
        if self.app and isinstance(self.app.model, FlatpakApplication):
            app_info = flatpak.get_app_info_fields(self.app.model.base_data.id, self.app.model.branch)
            app_info['name'] = self.app.model.base_data.name
            app_info['type'] = 'runtime' if self.app.model.runtime else 'app'
            app_info['description'] = self.app.model.base_data.description
            self.signal_finished.emit(app_info)
            self.app = None


class GetAppHistory(QThread):
    signal_finished = pyqtSignal(dict)

    def __init__(self, app: ApplicationView = None):
        super(GetAppHistory, self).__init__()
        self.app = app

    def run(self):
        if self.app and isinstance(self.app.model, FlatpakApplication):
            commits = flatpak.get_app_commits_data(self.app.model.ref, self.app.model.origin)
            self.signal_finished.emit({'model': self.app.model, 'commits': commits})
            self.app = None


class SearchApps(QThread):
    signal_finished = pyqtSignal(list)

    def __init__(self, manager: FlatpakManager):
        super(SearchApps, self).__init__()
        self.word = None
        self.manager = manager

    def run(self):
        apps_found = []

        if self.word:
            apps_found = self.manager.search(self.word)

        self.signal_finished.emit(apps_found)
        self.word = None


class InstallApp(QThread):

    signal_finished = pyqtSignal()
    signal_output = pyqtSignal(str)

    def __init__(self, app: ApplicationView = None):
        super(InstallApp, self).__init__()
        self.app = app

    def run(self):

        if self.app and isinstance(self.app.model, FlatpakApplication):
            for output in flatpak.install_and_stream(self.app.model.base_data.id, self.app.model.origin):
                line = output.decode().strip()
                if line:
                    self.signal_output.emit(line)

        self.app = None
        self.signal_finished.emit()


class AnimateProgress(QThread):

    signal_change = pyqtSignal(int)

    def __init__(self):
        super(AnimateProgress, self).__init__()
        self.progress_value = 0
        self.increment = 5
        self.stop = False

    def run(self):

        current_increment = self.increment

        while not self.stop:
            self.signal_change.emit(self.progress_value)

            if self.progress_value == 100:
                current_increment = -current_increment
            if self.progress_value == 0:
                current_increment = self.increment

            self.progress_value += current_increment

            time.sleep(0.05)

        self.progress_value = 0


class VerifyModels(QThread):

    signal_updates = pyqtSignal()

    def __init__(self, apps: List[ApplicationView] = None):
        super(VerifyModels, self).__init__()
        self.apps = apps

    def run(self):

        if self.apps:

            stop_at = datetime.utcnow() + timedelta(seconds=30)
            last_ready = 0

            while True:
                current_ready = 0

                for app in self.apps:
                    current_ready += 1 if app.model.status == ApplicationStatus.READY else 0

                if current_ready > last_ready:
                    last_ready = current_ready
                    self.signal_updates.emit()

                if current_ready == len(self.apps):
                    self.signal_updates.emit()
                    break

                if stop_at <= datetime.utcnow():
                    break