"""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 AGPLv3
# 🌐 https://www.gnu.org/licenses/agpl-3.0.html

import asyncio
import contextlib
import inspect
import json
import logging
import io
import os
import re
import telethon
import traceback
from typing import Optional
from logging.handlers import RotatingFileHandler

from . import utils
from ._types import Module, BotInlineCall


class HikkaException:
    def __init__(self, message: str, local_vars: str, full_stack: str):
        self.message = message
        self.local_vars = local_vars
        self.full_stack = full_stack

    @classmethod
    def from_exc_info(
        cls,
        exc_type: object,
        exc_value: Exception,
        tb: traceback.TracebackException,
    ) -> "HikkaException":
        def to_hashable(dictionary: dict) -> dict:
            dictionary = dictionary.copy()
            for key, value in dictionary.items():
                if isinstance(value, dict):
                    if (
                        getattr(getattr(value, "__class__", None), "__name__", None)
                        == "Database"
                    ):
                        dictionary[key] = "<Database>"

                    if isinstance(value, telethon.TelegramClient):
                        dictionary[key] = "<TelegramClient>"

                    dictionary[key] = to_hashable(value)
                else:
                    try:
                        json.dumps([value])
                    except Exception:
                        dictionary[key] = str(value)

            return dictionary

        full_stack = traceback.format_exc().replace(
            "Traceback (most recent call last):\n", ""
        )

        line_regex = r'  File "(.*?)", line ([0-9]+), in (.+)'

        def format_line(line: str) -> str:
            filename_, lineno_, name_ = re.search(line_regex, line).groups()
            with contextlib.suppress(Exception):
                filename_ = os.path.basename(filename_)

            return (
                f"👉 <code>{utils.escape_html(filename_)}:{lineno_}</code> <b>in</b>"
                f" <code>{utils.escape_html(name_)}</code>"
            )

        filename, lineno, name = next(
            (
                re.search(line_regex, line).groups()
                for line in full_stack.splitlines()
                if re.search(line_regex, line)
            ),
            (None, None, None),
        )
        line = next(
            (line for line in full_stack.splitlines() if line.startswith("   ")), ""
        )

        full_stack = "\n".join(
            [
                format_line(line)
                if re.search(line_regex, line)
                else f"<code>{utils.escape_html(line)}</code>"
                for line in full_stack.splitlines()
            ]
        )

        with contextlib.suppress(Exception):
            filename = os.path.basename(filename)

        return HikkaException(
            message=(
                "<b>🚫 Error!</b>\n<b>🗄 Where:</b>"
                f" <code>{utils.escape_html(filename)}:{lineno}</code><b>"
                f" in </b><code>{utils.escape_html(name)}</code>\n😵"
                f" <code>{utils.escape_html(line)}</code>"
                " 👈\n<b>❓ What:</b>"
                f" <code>{utils.escape_html(''.join(traceback.format_exception_only(exc_type, exc_value)).strip())}</code>"
            ),
            local_vars=(
                f"<code>{utils.escape_html(json.dumps(to_hashable(tb.tb_frame.f_locals), indent=4))}</code>"
            ),
            full_stack=full_stack,
        )


class TelegramLogsHandler(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, targets: list, capacity: int):
        super().__init__(0)
        self.targets = targets
        self.capacity = capacity
        self.buffer = []
        self.handledbuffer = []
        self.lvl = logging.NOTSET  # Default loglevel
        self._queue = []
        self.tg_buff = []
        self._mods = {}
        self.force_send_all = False

    def install_tg_log(self, mod: Module):
        if getattr(self, "_task", False):
            self._task.cancel()

        self._mods[mod.tg_id] = mod

        self._task = asyncio.ensure_future(self.queue_poller())

    async def queue_poller(self):
        while True:
            await self.sender()
            await asyncio.sleep(3)

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

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

    def dumps(self, lvl: Optional[int] = 0, client_id: Optional[int] = None) -> list:
        """Return all entries of minimum level as list of strings"""
        return [
            self.targets[0].format(record)
            for record in (self.buffer + self.handledbuffer)
            if record.levelno >= lvl
            and (not record.hikka_caller or client_id == record.hikka_caller)
        ]

    async def _show_full_stack(
        self,
        call: BotInlineCall,
        bot: "aiogram.Bot",  # type: ignore
        item: HikkaException,
    ):
        chunks = (
            item.message
            + "\n\n<b>🦝 Locals:</b>\n"
            + item.local_vars
            + "\n\n"
            + "<b>🪐 Full stack:</b>\n"
            + item.full_stack
        )

        chunks = list(utils.smart_split(*telethon.extensions.html.parse(chunks), 4096))

        await call.edit(chunks[0])

        for chunk in chunks[1:]:
            await bot.send_message(chat_id=call.chat_id, text=chunk)

    async def sender(self):
        self._queue = {
            client_id: utils.chunks(
                utils.escape_html(
                    "".join(
                        [
                            item[0]
                            for item in self.tg_buff
                            if isinstance(item[0], str)
                            and (
                                not item[1]
                                or item[1] == client_id
                                or self.force_send_all
                            )
                        ]
                    )
                ),
                4096,
            )
            for client_id in self._mods
        }

        self._exc_queue = {
            client_id: [
                self._mods[client_id].inline.bot.send_message(
                    self._mods[client_id]._logchat,
                    item[0].message,
                    reply_markup=self._mods[client_id].inline.generate_markup(
                        {
                            "text": "🪐 Full stack",
                            "callback": self._show_full_stack,
                            "args": (
                                self._mods[client_id].inline.bot,
                                item[0],
                            ),
                        }
                    ),
                )
                for item in self.tg_buff
                if isinstance(item[0], HikkaException)
                and (not item[1] or item[1] == client_id or self.force_send_all)
            ]
            for client_id in self._mods
        }

        for client_id, exceptions in self._exc_queue.items():
            for exc in exceptions:
                await exc

        self.tg_buff = []

        for client_id in self._mods:
            if client_id not in self._queue:
                continue

            if len(self._queue[client_id]) > 5:
                logfile = io.BytesIO("".join(self._queue[client_id]).encode("utf-8"))
                logfile.name = "hikka-logs.txt"
                logfile.seek(0)
                await self._mods[client_id].inline.bot.send_document(
                    self._mods[client_id]._logchat,
                    logfile,
                    caption=(
                        "<b>🧳 Journals are too big to be sent as separate messages</b>"
                    ),
                )

                self._queue[client_id] = []
                continue

            while self._queue[client_id]:
                if chunk := self._queue[client_id].pop(0):
                    asyncio.ensure_future(
                        self._mods[client_id].inline.bot.send_message(
                            self._mods[client_id]._logchat,
                            f"<code>{chunk}</code>",
                            disable_notification=True,
                        )
                    )

    def emit(self, record: logging.LogRecord):
        try:
            caller = next(
                (
                    frame_info.frame.f_locals["_hikka_client_id_logging_tag"]
                    for frame_info in inspect.stack()
                    if isinstance(
                        getattr(getattr(frame_info, "frame", None), "f_locals", {}).get(
                            "_hikka_client_id_logging_tag"
                        ),
                        int,
                    )
                ),
                False,
            )

            if not isinstance(caller, int):
                caller = None
        except Exception:
            caller = None

        record.hikka_caller = caller

        if record.levelno >= 20:
            if record.exc_info:
                self.tg_buff += [
                    (
                        HikkaException.from_exc_info(*record.exc_info),
                        caller,
                    )
                ]
            else:
                self.tg_buff += [
                    (
                        _tg_formatter.format(record),
                        caller,
                    )
                ]

        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:
                    for target in self.targets:
                        if record.levelno >= target.level:
                            target.handle(precord)

                self.handledbuffer = (
                    self.handledbuffer[-(self.capacity - len(self.buffer)) :]
                    + self.buffer
                )
                self.buffer = []
            finally:
                self.release()


_main_formatter = logging.Formatter(
    fmt="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
    datefmt="%Y-%m-%d %H:%M:%S",
    style="%",
)
_tg_formatter = logging.Formatter(
    fmt="[%(levelname)s] %(name)s: %(message)s\n",
    datefmt=None,
    style="%",
)

rotating_handler = RotatingFileHandler(
    filename="hikka.log",
    mode="a",
    maxBytes=10 * 1024 * 1024,
    backupCount=1,
    encoding="utf-8",
    delay=0,
)

rotating_handler.setFormatter(_main_formatter)


def init():
    handler = logging.StreamHandler()
    handler.setLevel(logging.INFO)
    handler.setFormatter(_main_formatter)
    logging.getLogger().handlers = []
    logging.getLogger().addHandler(
        TelegramLogsHandler((handler, rotating_handler), 7000)
    )
    logging.getLogger().setLevel(logging.NOTSET)
    logging.getLogger("telethon").setLevel(logging.WARNING)
    logging.getLogger("matplotlib").setLevel(logging.WARNING)
    logging.getLogger("aiohttp").setLevel(logging.WARNING)
    logging.getLogger("aiogram").setLevel(logging.WARNING)
    logging.captureWarnings(True)