import atexit
import dbus
import gettext
import importlib
import logging
import os
import pathlib
import subprocess

from keyman_config.sentry_handling import SentryErrorHandling
from keyman_config.version import (
  __version__,
  __versionwithtag__,
  __versiongittag__,
  __majorversion__,
  __releaseversion__,
  __tier__,
  __pkgversion__,
  __environment__,
  __uploadsentry__
)


def _(txt):
    translation = gettext.dgettext('keyman-config', txt)
    if translation == txt:
        translation = gettext.gettext(txt)
    return translation


def secure_lookup(data, key1, key2=None):
    """
    Return data[key1][key2] while dealing with data being None or key1 or key2 not existing
    """
    if not data:
        return None
    if key1 in data:
        if not key2:
            return data[key1]
        if key2 in data[key1]:
            return data[key1][key2]
    return None


def initialize_logging(args):
    if args.verbose:
        logging.basicConfig(level=logging.INFO, format='%(levelname)s:%(message)s')
    elif args.veryverbose:
        logging.basicConfig(level=logging.DEBUG, format='%(levelname)s:%(message)s')
    else:
        logging.basicConfig(format='%(levelname)s:%(message)s')


def initialize_sentry():
    SentryErrorHandling().initialize_sentry()


def are_requirements_missing():
    try:
        ttLib = importlib.import_module('fontTools.ttLib')
    except ImportError:
        return True
    return False


class FileCleanup():
    """
    Allow to register files that will be deleted when the process exits
    """
    def __init__(self):
        self._files_to_delete = {}
        atexit.register(self.__cleanup)

    def __cleanup(self):
        for key in self._files_to_delete:
            self._delete_file(self._files_to_delete[key])

    def _delete_file(self, file):
        try:
            pathlib.Path(file).unlink()
        except Exception:
            return

    def register(self, key, file):
        if key in self._files_to_delete and self._files_to_delete[key] != file:
            self._delete_file(self._files_to_delete[key])
        self._files_to_delete[key] = file

    def unregister(self, key):
        if key in self._files_to_delete:
            self._delete_file(self._files_to_delete[key])
            self._files_to_delete.pop(key)

    def get(self, key):
        if key in self._files_to_delete:
            return self._files_to_delete[key]
        return None


file_cleanup = FileCleanup()
__DBUS_STARTED_FOR_SESSION = False


def get_dbus_started_for_session():
    return __DBUS_STARTED_FOR_SESSION


def _set_dbus_started_for_session(value):
    global __DBUS_STARTED_FOR_SESSION
    __DBUS_STARTED_FOR_SESSION = value


def verify_dbus_running():
    if 'DBUS_SESSION_BUS_ADDRESS' in os.environ:
        # already running - nothing to do
        return

    try:
        # This might already be enough to start dbus
        bus = dbus.SessionBus()
        bus.close()
        return
    except dbus.exceptions.DBusException:
        try:
            # Seems dbus isn't running for the current user. Try to start it
            # and set these environment variables
            logging.info('Starting dbus with dbus-launch')
            stdout = subprocess.run(
                ('dbus-launch', '--exit-with-session'),
                stdout=subprocess.PIPE, check=False).stdout
            _set_dbus_started_for_session(True)
            lines = stdout.decode('utf-8').splitlines()
            for line in lines:
                equal_sign = line.find('=')
                if equal_sign <= 0:
                    logging.warning('Got unexpected line from dbus-launch: %s', line)
                    continue
                name = line[:equal_sign]
                value = line[equal_sign+1:]
                logging.debug('Setting environment %s=%s', name, value)
                os.environ[name] = value
        except Exception as e:
            logging.error('Starting dbus-launch failed with %s', e)


def add_standard_arguments(parser):
    if __pkgversion__:
        versionstring = f"{__versionwithtag__} (package version {__pkgversion__})"
    else:
        versionstring = f"{__versionwithtag__}"

    parser.add_argument('--version', action='version', version=f'%(prog)s version {versionstring}')
    parser.add_argument('-v', '--verbose', action='store_true', help='verbose logging')
    parser.add_argument('-vv', '--veryverbose', action='store_true', help='very verbose logging')


gettext.bindtextdomain('keyman-config', '/usr/share/locale')
gettext.textdomain('keyman-config')


#if __tier__ == 'alpha' or __tier__ == 'beta':  // #7227 disabling:
    # Alpha and beta versions will work against the staging server so that they
    # can access new APIs etc that will only be available there. The staging
    # servers have resource constraints but should be okay for limited use.
#    KeymanComUrl = 'https://keyman-staging.com'
#    KeymanApiUrl = 'https://api.keyman-staging.com'
#else:
KeymanComUrl = 'https://keyman.com'
KeymanApiUrl = 'https://api.keyman.com'


# There's no staging site for downloads
KeymanDownloadsUrl = 'https://downloads.keyman.com'
