from datetime import datetime, timezone

from typing import Optional, Union

import discord

from redbot.core import checks, commands, modlog
from redbot.core.bot import Red
from redbot.core.i18n import Translator, cog_i18n
from redbot.core.utils.chat_formatting import box
from redbot.core.utils.menus import DEFAULT_CONTROLS, menu

_ = Translator("ModLog", __file__)


@cog_i18n(_)
class ModLog(commands.Cog):
    """Manage log channels for moderation actions."""

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

    async def red_delete_data_for_user(self, **kwargs):
        """ Nothing to delete """
        return

    @commands.group()
    @checks.guildowner_or_permissions(administrator=True)
    async def modlogset(self, ctx: commands.Context):
        """Manage modlog settings."""
        pass

    @checks.is_owner()
    @modlogset.command(hidden=True, name="fixcasetypes")
    async def reapply_audittype_migration(self, ctx: commands.Context):
        """Command to fix misbehaving casetypes."""
        await modlog.handle_auditype_key()
        await ctx.tick()

    @modlogset.command(aliases=["channel"])
    @commands.guild_only()
    async def modlog(self, ctx: commands.Context, channel: discord.TextChannel = None):
        """Set a channel as the modlog.

        Omit `<channel>` to disable the modlog.
        """
        guild = ctx.guild
        if channel:
            if channel.permissions_for(guild.me).send_messages:
                await modlog.set_modlog_channel(guild, channel)
                await ctx.send(
                    _("Mod events will be sent to {channel}.").format(channel=channel.mention)
                )
            else:
                await ctx.send(
                    _("I do not have permissions to send messages in {channel}!").format(
                        channel=channel.mention
                    )
                )
        else:
            try:
                await modlog.get_modlog_channel(guild)
            except RuntimeError:
                await ctx.send(_("Mod log is already disabled."))
            else:
                await modlog.set_modlog_channel(guild, None)
                await ctx.send(_("Mod log deactivated."))

    @modlogset.command(name="cases")
    @commands.guild_only()
    async def set_cases(self, ctx: commands.Context, action: str = None):
        """Enable or disable case creation for a mod action."""
        guild = ctx.guild

        if action is None:  # No args given
            casetypes = await modlog.get_all_casetypes(guild)
            await ctx.send_help()
            lines = []
            for ct in casetypes:
                enabled = _("enabled") if await ct.is_enabled() else _("disabled")
                lines.append(f"{ct.name} : {enabled}")

            await ctx.send(_("Current settings:\n") + box("\n".join(lines)))
            return

        casetype = await modlog.get_casetype(action, guild)
        if not casetype:
            await ctx.send(_("That action is not registered."))
        else:
            enabled = await casetype.is_enabled()
            await casetype.set_enabled(not enabled)
            await ctx.send(
                _("Case creation for {action_name} actions is now {enabled}.").format(
                    action_name=action, enabled=_("enabled") if not enabled else _("disabled")
                )
            )

    @modlogset.command()
    @commands.guild_only()
    async def resetcases(self, ctx: commands.Context):
        """Reset all modlog cases in this server."""
        guild = ctx.guild
        await modlog.reset_cases(guild)
        await ctx.send(_("Cases have been reset."))

    @commands.command()
    @commands.guild_only()
    async def case(self, ctx: commands.Context, number: int):
        """Show the specified case."""
        try:
            case = await modlog.get_case(number, ctx.guild, self.bot)
        except RuntimeError:
            await ctx.send(_("That case does not exist for that server."))
            return
        else:
            if await ctx.embed_requested():
                await ctx.send(embed=await case.message_content(embed=True))
            else:
                message = _("{case}\n**Timestamp:** {timestamp}").format(
                    case=await case.message_content(embed=False),
                    timestamp=datetime.utcfromtimestamp(case.created_at).strftime(
                        "%Y-%m-%d %H:%M:%S UTC"
                    ),
                )
                await ctx.send(message)

    @commands.command()
    @commands.guild_only()
    async def casesfor(self, ctx: commands.Context, *, member: Union[discord.Member, int]):
        """Display cases for the specified member."""
        try:
            if isinstance(member, int):
                cases = await modlog.get_cases_for_member(
                    bot=ctx.bot, guild=ctx.guild, member_id=member
                )
            else:
                cases = await modlog.get_cases_for_member(
                    bot=ctx.bot, guild=ctx.guild, member=member
                )
        except discord.NotFound:
            return await ctx.send(_("That user does not exist."))
        except discord.HTTPException:
            return await ctx.send(
                _("Something unexpected went wrong while fetching that user by ID.")
            )

        if not cases:
            return await ctx.send(_("That user does not have any cases."))

        embed_requested = await ctx.embed_requested()
        if embed_requested:
            rendered_cases = [await case.message_content(embed=True) for case in cases]
        elif not embed_requested:
            rendered_cases = []
            for case in cases:
                message = _("{case}\n**Timestamp:** {timestamp}").format(
                    case=await case.message_content(embed=False),
                    timestamp=datetime.utcfromtimestamp(case.created_at).strftime(
                        "%Y-%m-%d %H:%M:%S UTC"
                    ),
                )
                rendered_cases.append(message)

        await menu(ctx, rendered_cases, DEFAULT_CONTROLS)

    @commands.command()
    @commands.guild_only()
    async def reason(self, ctx: commands.Context, case: Optional[int], *, reason: str):
        """Specify a reason for a modlog case.

        Please note that you can only edit cases you are
        the owner of unless you are a mod, admin or server owner.

        If no case number is specified, the latest case will be used.
        """
        author = ctx.author
        guild = ctx.guild
        if case is None:
            # get the latest case
            case_obj = await modlog.get_latest_case(guild, self.bot)
            if case_obj is None:
                await ctx.send(_("There are no modlog cases in this server."))
                return
        else:
            try:
                case_obj = await modlog.get_case(case, guild, self.bot)
            except RuntimeError:
                await ctx.send(_("That case does not exist!"))
                return

        is_guild_owner = author == guild.owner
        is_case_author = author == case_obj.moderator
        author_is_mod = await ctx.bot.is_mod(author)
        if not (is_guild_owner or is_case_author or author_is_mod):
            await ctx.send(_("You are not authorized to modify that case!"))
            return
        to_modify = {"reason": reason}
        if case_obj.moderator != author:
            to_modify["amended_by"] = author
        to_modify["modified_at"] = ctx.message.created_at.replace(tzinfo=timezone.utc).timestamp()
        await case_obj.edit(to_modify)
        await ctx.send(
            _("Reason for case #{num} has been updated.").format(num=case_obj.case_number)
        )
