from __future__ import annotations

import logging

import discord
from discord import app_commands
from discord.ext import commands

from features import shared

logger = logging.getLogger("vision")


class Welcome(commands.Cog):
    def __init__(self, bot: commands.Bot):
        self.bot = bot
        self._invites: dict[int, dict[str, int]] = {}

    @commands.Cog.listener()
    async def on_ready(self):
        await self._cache_invites()

    @commands.Cog.listener()
    async def on_guild_join(self, guild: discord.Guild):
        await self._cache_invites_for(guild)

    @commands.Cog.listener()
    async def on_member_join(self, member: discord.Member):
        cfg = shared.section(member.guild.id, "welcome")
        if not cfg.get("enabled"):
            return

        channel_id = cfg.get("channel_id")
        if not channel_id:
            return
        channel = member.guild.get_channel(channel_id)
        if not channel:
            return

        inviter = await self._find_inviter(member)

        text = cfg.get("message", "**{user}** a rejoint **{guild}** ! ({member_count} membres)")
        text = text.replace("{user}", member.mention).replace("{guild}", member.guild.name)
        text = text.replace("{member_count}", str(member.guild.member_count))
        text = text.replace("{username}", member.name)

        embed = discord.Embed(description=text, color=discord.Color.blurple())
        embed.set_thumbnail(url=member.display_avatar.url)

        if inviter:
            inviter_data = cfg.get("invites", {}).get(str(inviter.id), 0)
            embed.add_field(name="Invité par", value=f"{inviter.mention} ({inviter_data + 1} invites)")

        await channel.send(embed=embed)

        if cfg.get("dm_message"):
            try:
                dm_text = cfg["dm_message"].replace("{guild}", member.guild.name)
                await member.send(dm_text)
            except discord.HTTPException:
                pass

        await self._update_invite_count(member.guild, inviter)

    async def _find_inviter(self, member: discord.Member) -> discord.Member | None:
        try:
            invites = await member.guild.invites()
        except discord.HTTPException:
            return None

        cached = self._invites.get(member.guild.id, {})
        for inv in invites:
            if cached.get(inv.code, 0) < inv.uses:
                self._invites.setdefault(member.guild.id, {})[inv.code] = inv.uses
                return inv.inviter

        self._cache_invites_for(member.guild)
        return None

    async def _update_invite_count(self, guild: discord.Guild, inviter: discord.Member | None):
        if not inviter:
            return
        cfg = shared.get(guild.id, "welcome")
        invites = cfg.get("invites", {})
        key = str(inviter.id)
        invites[key] = invites.get(key, 0) + 1
        shared.set(guild.id, "welcome", {**cfg, "invites": invites})

    async def _cache_invites(self):
        for guild in self.bot.guilds:
            await self._cache_invites_for(guild)

    async def _cache_invites_for(self, guild: discord.Guild):
        try:
            invites = await guild.invites()
            self._invites[guild.id] = {inv.code: inv.uses for inv in invites}
        except discord.HTTPException:
            self._invites[guild.id] = {}

    @app_commands.command(name="welcome_setup", description="Configurer le message d'arrivée")
    @app_commands.describe(channel="Canal d'arrivée", message="Message (utilise {user}, {guild}, {member_count})")
    @app_commands.checks.has_permissions(manage_guild=True)
    async def welcome_setup(self, interaction: discord.Interaction, channel: discord.TextChannel, message: str = ""):
        cfg = shared.get(interaction.guild_id, "welcome")
        cfg["enabled"] = True
        cfg["channel_id"] = channel.id
        if message:
            cfg["message"] = message
        shared.set(interaction.guild_id, "welcome", cfg)
        await interaction.response.send_message(f"Message d'arrivée configuré dans {channel.mention}", ephemeral=True)

    @app_commands.command(name="welcome_disable", description="Désactiver le message d'arrivée")
    @app_commands.checks.has_permissions(manage_guild=True)
    async def welcome_disable(self, interaction: discord.Interaction):
        cfg = shared.get(interaction.guild_id, "welcome")
        cfg["enabled"] = False
        shared.set(interaction.guild_id, "welcome", cfg)
        await interaction.response.send_message("Message d'arrivée désactivé.", ephemeral=True)

    @app_commands.command(name="invites", description="Voir le nombre d'invitations d'un membre")
    @app_commands.describe(member="Membre à vérifier")
    async def invites(self, interaction: discord.Interaction, member: discord.Member):
        cfg = shared.get(interaction.guild_id, "welcome")
        invites = cfg.get("invites", {})
        count = invites.get(str(member.id), 0)
        embed = discord.Embed(
            title=f"Invitations de {member}",
            description=f"**{count}** invitations",
            color=discord.Color.blurple(),
        )
        embed.set_thumbnail(url=member.display_avatar.url)
        await interaction.response.send_message(embed=embed)


async def setup(bot: commands.Bot):
    await bot.add_cog(Welcome(bot))