#    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/>.

import asyncio
import atexit
import functools
import logging
import os
import subprocess
import sys
import uuid
import telethon

import git
from git import Repo, GitCommandError
from telethon.tl.types import Message

from .. import loader, utils

logger = logging.getLogger(__name__)


@loader.tds
class UpdaterMod(loader.Module):
    """Updates itself"""

    strings = {
        "name": "Updater",
        "source": "ℹ️ <b>Read the source code from</b> <a href='{}'>here</a>",
        "restarting_caption": "🔄 <b>Restarting...</b>",
        "downloading": "🔄 <b>Downloading updates...</b>",
        "downloaded": "✅ <b>Downloaded successfully.\nPlease type</b> \n<code>.restart</code> <b>to restart the bot.</b>",
        "already_updated": "✅ <b>Already up to date!</b>",
        "installing": "🔁 <b>Installing updates...</b>",
        "success": "✅ <b>Restart successful!</b>",
        "heroku_warning": "⚠️ <b>Heroku API key has not been set. </b>Update was successful but updates will reset every time the bot restarts.",
        "origin_cfg_doc": "Git origin URL, for where to update from",
    }

    def __init__(self):
        self.config = loader.ModuleConfig(
            "GIT_ORIGIN_URL",
            "https://github.com/hikariatama/Hikka",
            lambda m: self.strings("origin_cfg_doc", m),
        )

    @loader.owner
    async def restartcmd(self, message: Message) -> None:
        """Restarts the userbot"""
        msg = (
            await utils.answer(message, self.strings("restarting_caption", message))
        )[0]
        await self.restart_common(msg)

    async def prerestart_common(self, message: Message) -> None:
        logger.debug(f"Self-update. {sys.executable} -m {utils.get_base_dir()}")

        check = str(uuid.uuid4())
        await self._db.set(__name__, "selfupdatecheck", check)
        await asyncio.sleep(3)
        if self._db.get(__name__, "selfupdatecheck", "") != check:
            raise ValueError("An update is already in progress!")
        self._db.set(__name__, "selfupdatechat", utils.get_chat_id(message))
        await self._db.set(__name__, "selfupdatemsg", message.id)

    async def restart_common(self, message: Message) -> None:
        await self.prerestart_common(message)
        atexit.register(functools.partial(restart, *sys.argv[1:]))
        [handler] = logging.getLogger().handlers
        handler.setLevel(logging.CRITICAL)
        for client in self.allclients:
            # Terminate main loop of all running clients
            # Won't work if not all clients are ready
            if client is not message.client:
                await client.disconnect()
        await message.client.disconnect()

    @loader.owner
    async def downloadcmd(self, message: Message) -> None:
        """Downloads userbot updates"""
        message = await utils.answer(message, self.strings("downloading", message))
        await self.download_common()
        await utils.answer(message, self.strings("downloaded", message))

    async def download_common(self):
        try:
            repo = Repo(os.path.dirname(utils.get_base_dir()))
            origin = repo.remote("origin")
            r = origin.pull()
            new_commit = repo.head.commit
            for info in r:
                if info.old_commit:
                    for d in new_commit.diff(info.old_commit):
                        if d.b_path == "requirements.txt":
                            return True
            return False
        except git.exc.InvalidGitRepositoryError:
            repo = Repo.init(os.path.dirname(utils.get_base_dir()))
            origin = repo.create_remote("origin", self.config["GIT_ORIGIN_URL"])
            origin.fetch()
            repo.create_head("master", origin.refs.master)
            repo.heads.master.set_tracking_branch(origin.refs.master)
            repo.heads.master.checkout(True)
            return (
                False  # Heroku never needs to install dependencies because we redeploy
            )

    @staticmethod
    def req_common() -> None:
        # Now we have downloaded new code, install requirements
        logger.debug("Installing new requirements...")
        try:
            subprocess.run(  # skipcq: PYL-W1510
                [
                    sys.executable,
                    "-m",
                    "pip",
                    "install",
                    "-r",
                    os.path.join(
                        os.path.dirname(utils.get_base_dir()), "requirements.txt"
                    ),
                    "--user",
                ]
            )

        except subprocess.CalledProcessError:
            logger.exception("Req install failed")

    @loader.owner
    async def updatecmd(self, message: Message, hard: bool = False) -> None:
        """Downloads userbot updates"""
        # We don't really care about asyncio at this point, as we are shutting down
        if hard:
            os.system(f"cd {utils.get_base_dir()} && cd .. && git reset --hard HEAD")  # skipcq: BAN-B605

        try:
            try:
                msgs = await utils.answer(message, self.strings("downloading", message))
            except telethon.errors.rpcerrorlist.MessageNotModifiedError:
                pass

            req_update = await self.download_common()

            try:
                message = (
                    await utils.answer(msgs, self.strings("installing", message))
                )[0]
            except telethon.errors.rpcerrorlist.MessageNotModifiedError:
                pass

            if heroku_key := os.environ.get("heroku_api_token"):
                from .. import heroku

                await self.prerestart_common(message)
                heroku.publish(self.allclients, heroku_key)
                # If we pushed, this won't return. If the push failed, we will get thrown at.
                # So this only happens when remote is already up to date (remote is heroku, where we are running)
                self._db.set(__name__, "selfupdatechat", None)
                self._db.set(__name__, "selfupdatemsg", None)

                await utils.answer(message, self.strings("already_updated", message))
            else:
                if req_update:
                    self.req_common()
                await self.restart_common(message)
        except GitCommandError:
            await self.updatecmd(message, True)

    @loader.unrestricted
    async def sourcecmd(self, message: Message) -> None:
        """Links the source code of this project"""
        await utils.answer(
            message,
            self.strings("source", message).format(self.config["GIT_ORIGIN_URL"]),
        )

    async def client_ready(self, client, db):
        self._db = db
        self._me = await client.get_me()
        self._client = client

        if (
            db.get(__name__, "selfupdatechat") is not None
            and db.get(__name__, "selfupdatemsg") is not None
        ):
            try:
                await self.update_complete(client)
            except Exception:
                logger.exception("Failed to complete update!")

        self._db.set(__name__, "selfupdatechat", None)
        self._db.set(__name__, "selfupdatemsg", None)

    async def update_complete(self, client):
        logger.debug("Self update successful! Edit message")
        heroku_key = os.environ.get("heroku_api_token")
        herokufail = ("DYNO" in os.environ) and (heroku_key is None)

        if herokufail:
            logger.warning("heroku token not set")
            msg = self.strings("heroku_warning")
        else:
            logger.debug("Self update successful! Edit message")
            msg = self.strings("success")

        await client.edit_message(
            self._db.get(__name__, "selfupdatechat"),
            self._db.get(__name__, "selfupdatemsg"),
            msg,
        )


def restart(*argv):
    os.execl(  # skipcq: BAN-B606
        sys.executable,  # skipcq: BAN-B606
        sys.executable,  # skipcq: BAN-B606
        "-m",  # skipcq: BAN-B606
        os.path.relpath(utils.get_base_dir()),  # skipcq: BAN-B606
        *argv,  # skipcq: BAN-B606
    )  # skipcq: BAN-B606