# Copyright (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "VK scripts" project.
# For details, see https://github.com/egor-tensin/vk-scripts.
# Distributed under the MIT License.

import logging

from .. import meta

class Writer(meta.Writer):
    def __init__(self, fd):
        self._logger = logging.getLogger(__file__)
        self._logger.setLevel(logging.INFO)
        handler = logging.StreamHandler(fd)
        handler.setFormatter(logging.Formatter(
            fmt='[%(asctime)s] %(message)s',
            datefmt='%Y-%m-%d %H:%M:%S'))
        self._logger.addHandler(handler)

        self._reset_last_notification()

    def info(self, *args, **kwargs):
        self._logger.info(*args, **kwargs)

    def exception(self, *args, **kwargs):
        self._logger.exception(*args, **kwargs)

    def error(self, *args, **kwargs):
        self._logger.error(*args, **kwargs)

    def _reset_last_notification(self):
        self._last_error = False, None

    def _set_last_notification(self, e):
        self._last_error = True, str(e)

    @property
    def _last_notification_was_connection_error(self):
        return self._last_error[0]

    @property
    def _last_notification_error_message(self):
        return self._last_error[1]

    def on_initial_status(self, user):
        self._reset_last_notification()
        if user.is_online():
            self.info(self._format_user_is_online(user))
        else:
            self.info(self._format_user_is_offline(user))
        self.info(self._format_user_last_seen(user))

    def on_status_update(self, user):
        self._reset_last_notification()
        if user.is_online():
            self.info(self._format_user_went_online(user))
        else:
            self.info(self._format_user_went_offline(user))
        self.info(self._format_user_last_seen(user))

    def on_connection_error(self, e):
        if self._last_notification_was_connection_error:
            if str(e) == self._last_notification_error_message:
                self.error(self._format_another_connection_error(e))
                return
        self._set_last_notification(e)
        self.exception(e)

    @staticmethod
    def _format_user(user):
        if user.has_last_name():
            return '{} {}'.format(user.get_first_name(), user.get_last_name())
        return '{}'.format(user.get_first_name())

    @staticmethod
    def _format_user_is_online(user):
        return '{} is ONLINE.'.format(Writer._format_user(user))

    @staticmethod
    def _format_user_is_offline(user):
        return '{} is OFFLINE.'.format(Writer._format_user(user))

    @staticmethod
    def _format_user_last_seen(user):
        return '{} was last seen at {} using {}.'.format(
            Writer._format_user(user),
            user.get_last_seen_time_local(),
            user.get_last_seen_platform().get_descr_text())

    @staticmethod
    def _format_user_went_online(user):
        return '{} went ONLINE.'.format(Writer._format_user(user))

    @staticmethod
    def _format_user_went_offline(user):
        return '{} went OFFLINE.'.format(Writer._format_user(user))

    @staticmethod
    def _format_another_connection_error(e):
        return 'Encountered a connection error which looks like the previous one: ' + str(e)