"""Main logging part"""

#    Friendly Telegram (telegram userbot)
#    Copyright (C) 2018-2021 The Authors

#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU Affero General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.

#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU Affero General Public License for more details.

#    You should have received a copy of the GNU Affero General Public License
#    along with this program.  If not, see <https://www.gnu.org/licenses/>.

# █ █ ▀ █▄▀ ▄▀█ █▀█ ▀    ▄▀█ ▀█▀ ▄▀█ █▀▄▀█ ▄▀█
# █▀█ █ █ █ █▀█ █▀▄ █ ▄  █▀█  █  █▀█ █ ▀ █ █▀█
#
#              © Copyright 2022
#
#          https://t.me/hikariatama
#
# 🔒 Licensed under the GNU GPLv3
# 🌐 https://www.gnu.org/licenses/agpl-3.0.html

# TODO: Replace with native bot logging, if inline is enabled

import logging

_formatter = logging.Formatter


class MemoryHandler(logging.Handler):
    """
    Keeps 2 buffers.
    One for dispatched messages.
    One for unused messages.
    When the length of the 2 together is 100
    truncate to make them 100 together,
    first trimming handled then unused.
    """

    def __init__(self, target, capacity):
        super().__init__(0)
        self.target = target
        self.capacity = capacity
        self.buffer = []
        self.handledbuffer = []
        self.lvl = logging.WARNING  # Default loglevel

    def setLevel(self, level):
        self.lvl = level

    def dump(self):
        """Return a list of logging entries"""
        return self.handledbuffer + self.buffer

    def dumps(self, lvl=0):
        """Return all entries of minimum level as list of strings"""
        return [
            self.target.format(record)
            for record in (self.buffer + self.handledbuffer)
            if record.levelno >= lvl
        ]

    def emit(self, record):
        if len(self.buffer) + len(self.handledbuffer) >= self.capacity:
            if self.handledbuffer:
                del self.handledbuffer[0]
            else:
                del self.buffer[0]
        self.buffer.append(record)
        if record.levelno >= self.lvl >= 0:
            self.acquire()
            try:
                for precord in self.buffer:
                    self.target.handle(precord)
                self.handledbuffer = (
                    self.handledbuffer[-(self.capacity - len(self.buffer)) :]
                    + self.buffer
                )
                self.buffer = []
            finally:
                self.release()


def init():
    formatter = _formatter(logging.BASIC_FORMAT, "")
    handler = logging.StreamHandler()
    handler.setFormatter(formatter)
    logging.getLogger().handlers = []
    logging.getLogger().addHandler(MemoryHandler(handler, 2500))
    logging.getLogger().setLevel(0)
    logging.captureWarnings(True)