#!/usr/bin/env python

# Discord Version check

import asyncio
import json
import logging
import os
import shutil
import sys
from copy import deepcopy
from pathlib import Path

import discord

# Set the event loop policies here so any subsequent `get_event_loop()`
# calls, in particular those as a result of the following imports,
# return the correct loop object.
from redbot import _update_event_loop_policy

_update_event_loop_policy()

import redbot.logging
from redbot.core.bot import Red, ExitCodes
from redbot.core.cog_manager import CogManagerUI
from redbot.core.global_checks import init_global_checks
from redbot.core.events import init_events
from redbot.core.cli import interactive_config, confirm, parse_cli_flags
from redbot.core.core_commands import Core, license_info_command
from redbot.setup import get_data_dir, get_name, save_config
from redbot.core.dev_commands import Dev
from redbot.core import __version__, modlog, bank, data_manager, drivers
from signal import SIGTERM


log = logging.getLogger("red.main")

#
#               Red - Discord Bot v3
#
#         Made by Twentysix, improved by many
#


async def _get_prefix_and_token(red, indict):
    """
    Again, please blame <@269933075037814786> for this.
    :param indict:
    :return:
    """
    indict["token"] = await red._config.token()
    indict["prefix"] = await red._config.prefix()


def _get_instance_names():
    with data_manager.config_file.open(encoding="utf-8") as fs:
        data = json.load(fs)
    return sorted(data.keys())


def list_instances():
    if not data_manager.config_file.exists():
        print(
            "No instances have been configured! Configure one "
            "using `redbot-setup` before trying to run the bot!"
        )
        sys.exit(1)
    else:
        text = "Configured Instances:\n\n"
        for instance_name in _get_instance_names():
            text += "{}\n".format(instance_name)
        print(text)
        sys.exit(0)


def edit_instance(red, cli_flags):
    no_prompt = cli_flags.no_prompt
    token = cli_flags.token
    owner = cli_flags.owner
    old_name = cli_flags.instance_name
    new_name = cli_flags.edit_instance_name
    data_path = cli_flags.edit_data_path
    copy_data = cli_flags.copy_data
    confirm_overwrite = cli_flags.overwrite_existing_instance

    if data_path is None and copy_data:
        print("--copy-data can't be used without --edit-data-path argument")
        sys.exit(1)
    if new_name is None and confirm_overwrite:
        print("--overwrite-existing-instance can't be used without --edit-instance-name argument")
        sys.exit(1)
    if no_prompt and all(to_change is None for to_change in (token, owner, new_name, data_path)):
        print(
            "No arguments to edit were provided. Available arguments (check help for more "
            "information): --edit-instance-name, --edit-data-path, --copy-data, --owner, --token"
        )
        sys.exit(1)

    _edit_token(red, token, no_prompt)
    _edit_owner(red, owner, no_prompt)

    data = deepcopy(data_manager.basic_config)
    name = _edit_instance_name(old_name, new_name, confirm_overwrite, no_prompt)
    _edit_data_path(data, data_path, copy_data, no_prompt)

    save_config(name, data)
    if old_name != name:
        save_config(old_name, {}, remove=True)


def _edit_token(red, token, no_prompt):
    if token:
        if not len(token) >= 50:
            print(
                "The provided token doesn't look a valid Discord bot token."
                " Instance's token will remain unchanged.\n"
            )
            return
        red.loop.run_until_complete(red._config.token.set(token))
    elif not no_prompt and confirm("Would you like to change instance's token?", default=False):
        interactive_config(red, False, True, print_header=False)
        print("Token updated.\n")


def _edit_owner(red, owner, no_prompt):
    if owner:
        if not (15 <= len(str(owner)) <= 21):
            print(
                "The provided owner id doesn't look like a valid Discord user id."
                " Instance's owner will remain unchanged."
            )
            return
        red.loop.run_until_complete(red._config.owner.set(owner))
    elif not no_prompt and confirm("Would you like to change instance's owner?", default=False):
        print(
            "Remember:\n"
            "ONLY the person who is hosting Red should be owner."
            " This has SERIOUS security implications."
            " The owner can access any data that is present on the host system.\n"
        )
        if confirm("Are you sure you want to change instance's owner?", default=False):
            print("Please enter a Discord user id for new owner:")
            while True:
                owner_id = input("> ").strip()
                if not (15 <= len(owner_id) <= 21 and owner_id.isdecimal()):
                    print("That doesn't look like a valid Discord user id.")
                    continue
                owner_id = int(owner_id)
                red.loop.run_until_complete(red._config.owner.set(owner_id))
                print("Owner updated.")
                break
        else:
            print("Instance's owner will remain unchanged.")
        print()


def _edit_instance_name(old_name, new_name, confirm_overwrite, no_prompt):
    if new_name:
        name = new_name
        if name in _get_instance_names() and not confirm_overwrite:
            name = old_name
            print(
                "An instance with this name already exists.\n"
                "If you want to remove the existing instance and replace it with this one,"
                " run this command with --overwrite-existing-instance flag."
            )
    elif not no_prompt and confirm("Would you like to change the instance name?", default=False):
        name = get_name()
        if name in _get_instance_names():
            print(
                "WARNING: An instance already exists with this name. "
                "Continuing will overwrite the existing instance config."
            )
            if not confirm(
                "Are you absolutely certain you want to continue with this instance name?",
                default=False,
            ):
                print("Instance name will remain unchanged.")
                name = old_name
            else:
                print("Instance name updated.")
            print()
    else:
        name = old_name
    return name


def _edit_data_path(data, data_path, copy_data, no_prompt):
    # This modifies the passed dict.
    if data_path:
        data["DATA_PATH"] = data_path
        if copy_data and not _copy_data(data):
            print("Can't copy data to non-empty location. Data location will remain unchanged.")
            data["DATA_PATH"] = data_manager.basic_config["DATA_PATH"]
    elif not no_prompt and confirm("Would you like to change the data location?", default=False):
        data["DATA_PATH"] = get_data_dir()
        if confirm(
            "Do you want to copy the data from old location?", default=True
        ) and not _copy_data(data):
            print("Can't copy the data to non-empty location.")
            if not confirm("Do you still want to use the new data location?"):
                data["DATA_PATH"] = data_manager.basic_config["DATA_PATH"]
                print("Data location will remain unchanged.")
            else:
                print("Data location updated.")


def _copy_data(data):
    if Path(data["DATA_PATH"]).exists():
        if any(os.scandir(data["DATA_PATH"])):
            return False
        else:
            # this is needed because copytree doesn't work when destination folder exists
            # Python 3.8 has `dirs_exist_ok` option for that
            os.rmdir(data["DATA_PATH"])
    shutil.copytree(data_manager.basic_config["DATA_PATH"], data["DATA_PATH"])
    return True


async def sigterm_handler(red, log):
    log.info("SIGTERM received. Quitting...")
    await red.shutdown(restart=False)


def main():
    description = "Red V3"
    cli_flags = parse_cli_flags(sys.argv[1:])
    if cli_flags.list_instances:
        list_instances()
    elif cli_flags.version:
        print(description)
        print("Current Version: {}".format(__version__))
        sys.exit(0)
    elif not cli_flags.instance_name and (not cli_flags.no_instance or cli_flags.edit):
        print("Error: No instance name was provided!")
        sys.exit(1)
    if cli_flags.no_instance:
        print(
            "\033[1m"
            "Warning: The data will be placed in a temporary folder and removed on next system "
            "reboot."
            "\033[0m"
        )
        cli_flags.instance_name = "temporary_red"
        data_manager.create_temp_config()
    loop = asyncio.get_event_loop()

    data_manager.load_basic_configuration(cli_flags.instance_name)
    driver_cls = drivers.get_driver_class()
    loop.run_until_complete(driver_cls.initialize(**data_manager.storage_details()))
    redbot.logging.init_logging(
        level=cli_flags.logging_level, location=data_manager.core_data_path() / "logs"
    )

    log.debug("====Basic Config====")
    log.debug("Data Path: %s", data_manager._base_data_path())
    log.debug("Storage Type: %s", data_manager.storage_type())

    red = Red(
        cli_flags=cli_flags, description=description, dm_help=None, fetch_offline_members=True
    )
    loop.run_until_complete(red._maybe_update_config())

    if cli_flags.edit:
        try:
            edit_instance(red, cli_flags)
        except (KeyboardInterrupt, EOFError):
            print("Aborted!")
        finally:
            loop.run_until_complete(driver_cls.teardown())
        sys.exit(0)

    init_global_checks(red)
    init_events(red, cli_flags)

    # lib folder has to be in sys.path before trying to load any 3rd-party cog (GH-3061)
    # We might want to change handling of requirements in Downloader at later date
    LIB_PATH = data_manager.cog_data_path(raw_name="Downloader") / "lib"
    LIB_PATH.mkdir(parents=True, exist_ok=True)
    if str(LIB_PATH) not in sys.path:
        sys.path.append(str(LIB_PATH))

    red.add_cog(Core(red))
    red.add_cog(CogManagerUI())
    red.add_command(license_info_command)
    if cli_flags.dev:
        red.add_cog(Dev())
    # noinspection PyProtectedMember
    loop.run_until_complete(modlog._init(red))
    # noinspection PyProtectedMember
    bank._init()

    if os.name == "posix":
        loop.add_signal_handler(SIGTERM, lambda: asyncio.ensure_future(sigterm_handler(red, log)))
    tmp_data = {}
    loop.run_until_complete(_get_prefix_and_token(red, tmp_data))
    token = os.environ.get("RED_TOKEN", tmp_data["token"])
    if cli_flags.token:
        token = cli_flags.token
    prefix = cli_flags.prefix or tmp_data["prefix"]
    if not (token and prefix):
        if cli_flags.no_prompt is False:
            new_token = interactive_config(red, token_set=bool(token), prefix_set=bool(prefix))
            if new_token:
                token = new_token
        else:
            log.critical("Token and prefix must be set in order to login.")
            sys.exit(1)
    loop.run_until_complete(_get_prefix_and_token(red, tmp_data))

    if cli_flags.dry_run:
        loop.run_until_complete(red.http.close())
        sys.exit(0)
    try:
        loop.run_until_complete(red.start(token, bot=True, cli_flags=cli_flags))
    except discord.LoginFailure:
        log.critical("This token doesn't seem to be valid.")
        db_token = loop.run_until_complete(red._config.token())
        if db_token and not cli_flags.no_prompt:
            if confirm("\nDo you want to reset the token?"):
                loop.run_until_complete(red._config.token.set(""))
                print("Token has been reset.")
    except KeyboardInterrupt:
        log.info("Keyboard interrupt detected. Quitting...")
        loop.run_until_complete(red.logout())
        red._shutdown_mode = ExitCodes.SHUTDOWN
    except Exception as e:
        log.critical("Fatal exception", exc_info=e)
        loop.run_until_complete(red.logout())
    finally:
        pending = asyncio.Task.all_tasks(loop=red.loop)
        gathered = asyncio.gather(*pending, loop=red.loop, return_exceptions=True)
        gathered.cancel()
        try:
            loop.run_until_complete(red.rpc.close())
        except AttributeError:
            pass

        sys.exit(red._shutdown_mode.value)


if __name__ == "__main__":
    main()