from collections import defaultdict
from typing import List, Tuple
from abc import ABC

import discord
from redbot.core import Config, modlog, commands
from redbot.core.bot import Red
from redbot.core.i18n import Translator, cog_i18n
from .casetypes import CASETYPES
from .events import Events
from .kickban import KickBanMixin
from .movetocore import MoveToCore
from .mutes import MuteMixin
from .names import ModInfo
from .settings import ModSettings

_ = T_ = Translator("Mod", __file__)

__version__ = "1.0.0"


class CompositeMetaClass(type(commands.Cog), type(ABC)):
    """
    This allows the metaclass used for proper type detection to
    coexist with discord.py's metaclass
    """

    pass


@cog_i18n(_)
class Mod(
    ModSettings,
    Events,
    KickBanMixin,
    MoveToCore,
    MuteMixin,
    ModInfo,
    commands.Cog,
    metaclass=CompositeMetaClass,
):
    """Moderation tools."""

    default_global_settings = {"version": ""}

    default_guild_settings = {
        "ban_mention_spam": False,
        "delete_repeats": -1,
        "ignored": False,
        "respect_hierarchy": True,
        "delete_delay": -1,
        "reinvite_on_unban": False,
        "current_tempbans": [],
    }

    default_channel_settings = {"ignored": False}

    default_member_settings = {"past_nicks": [], "perms_cache": {}, "banned_until": False}

    default_user_settings = {"past_names": []}

    def __init__(self, bot: Red):
        super().__init__()
        self.bot = bot

        self.settings = Config.get_conf(self, 4961522000, force_registration=True)
        self.settings.register_global(**self.default_global_settings)
        self.settings.register_guild(**self.default_guild_settings)
        self.settings.register_channel(**self.default_channel_settings)
        self.settings.register_member(**self.default_member_settings)
        self.settings.register_user(**self.default_user_settings)
        self.ban_queue: List[Tuple[int, int]] = []
        self.unban_queue: List[Tuple[int, int]] = []
        self.cache: dict = {}
        self.registration_task = self.bot.loop.create_task(self._casetype_registration())
        self.tban_expiry_task = self.bot.loop.create_task(self.check_tempban_expirations())
        self.last_case: dict = defaultdict(dict)

    async def initialize(self):
        await self._maybe_update_config()

    def cog_unload(self):
        self.registration_task.cancel()
        self.tban_expiry_task.cancel()

    async def _maybe_update_config(self):
        """Maybe update `delete_delay` value set by Config prior to Mod 1.0.0."""
        if await self.settings.version():
            return
        guild_dict = await self.settings.all_guilds()
        for guild_id, info in guild_dict.items():
            delete_repeats = info.get("delete_repeats", False)
            if delete_repeats:
                val = 3
            else:
                val = -1
            await self.settings.guild(discord.Object(id=guild_id)).delete_repeats.set(val)
        await self.settings.version.set(__version__)

    @staticmethod
    async def _casetype_registration():
        try:
            await modlog.register_casetypes(CASETYPES)
        except RuntimeError:
            pass

    # TODO: Move this to core.
    # This would be in .movetocore , but the double-under name here makes that more trouble
    async def bot_check(self, ctx):
        """Global check to see if a channel or server is ignored.

        Any users who have permission to use the `ignore` or `unignore` commands
        surpass the check.
        """
        perms = ctx.channel.permissions_for(ctx.author)
        surpass_ignore = (
            isinstance(ctx.channel, discord.abc.PrivateChannel)
            or perms.manage_guild
            or await ctx.bot.is_owner(ctx.author)
            or await ctx.bot.is_admin(ctx.author)
        )
        if surpass_ignore:
            return True
        guild_ignored = await self.settings.guild(ctx.guild).ignored()
        chann_ignored = await self.settings.channel(ctx.channel).ignored()
        return not (guild_ignored or chann_ignored and not perms.manage_channels)

    @classmethod
    async def get_audit_entry_info(
        cls, guild: discord.Guild, action: discord.AuditLogAction, target
    ):
        """Get info about an audit log entry.

        Parameters
        ----------
        guild : discord.Guild
            Same as ``guild`` in `get_audit_log_entry`.
        action : int
            Same as ``action`` in `get_audit_log_entry`.
        target : `discord.User` or `discord.Member`
            Same as ``target`` in `get_audit_log_entry`.

        Returns
        -------
        tuple
            A tuple in the form``(mod: discord.Member, reason: str,
            date_created: datetime.datetime)``. Returns ``(None, None, None)``
            if the audit log entry could not be found.
        """
        try:
            entry = await cls.get_audit_log_entry(guild, action=action, target=target)
        except discord.HTTPException:
            entry = None
        if entry is None:
            return None, None, None
        return entry.user, entry.reason, entry.created_at

    @staticmethod
    async def get_audit_log_entry(guild: discord.Guild, action: discord.AuditLogAction, target):
        """Get an audit log entry.

        Any exceptions encountered when looking through the audit log will be
        propogated out of this function.

        Parameters
        ----------
        guild : discord.Guild
            The guild for the audit log.
        action : int
            The audit log action (see `discord.AuditLogAction`).
        target : `discord.Member` or `discord.User`
            The target of the audit log action.

        Returns
        -------
        discord.AuditLogEntry
            The audit log entry. Returns ``None`` if not found.

        """
        async for entry in guild.audit_logs(action=action):
            if entry.target == target:
                return entry