# modules/common/bot_restart.py
import os
import re
import time
import asyncio
from datetime import datetime, timezone

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

from modules.common.settings import cfg
from mod_perms import require_mod_interaction

WEAK_REASONS = {
    "stuck", "idk", "dont know", "don't know", "unknown", "?", "lag",
    "restart", "restarting", "update", "updating", "bug", "crash", "crashed"
}

def _now_utc_str() -> str:
    return datetime.now(timezone.utc).strftime('%Y-%m-%d %H:%M UTC')

def _reason_ok(s: str) -> tuple[bool, str | None]:
    """
    Enforce a descriptive reason:
      - >= 20 characters
      - >= 4 words
      - at least 3 words with length >= 3
      - reject trivial/weak phrases
    """
    if not s:
        return False, "Reason is required."
    s = s.strip()
    if len(s) < 20:
        return False, "Please provide a more descriptive reason (≥ 20 characters)."
    words = re.findall(r"[A-Za-z0-9'-]+", s)
    if len(words) < 4:
        return False, "Please include at least 4 words."
    longish = [w for w in words if len(w) >= 3]
    if len(longish) < 3:
        return False, "Add more detail—use at least three meaningful words (≥3 letters)."
    low = s.lower()
    if low in WEAK_REASONS or any(low == w for w in WEAK_REASONS):
        return False, "Reason is too vague. Please explain what happened."
    return True, None

class BotRestartCog(commands.Cog):
    def __init__(self, bot: commands.Bot):
        self.bot = bot
        self._restarting = False
        r = cfg(bot)
        self.modlog_channel_id = r.int('modlog_channel_id', 0)

    async def _send_modlog(self, guild: discord.Guild, content: str):
        if not self.modlog_channel_id:
            print("[bot_restart] modlog_channel_id not configured; skipping modlog message.")
            return
        ch = guild.get_channel(self.modlog_channel_id)
        if not ch:
            # fallback: global fetch
            ch = self.bot.get_channel(self.modlog_channel_id)
        if ch:
            try:
                await ch.send(content, allowed_mentions=discord.AllowedMentions.none())
            except Exception as e:
                print("[bot_restart] failed to send modlog:", repr(e))
        else:
            print(f"[bot_restart] channel id {self.modlog_channel_id} not found.")

    def _current_version(self) -> str | None:
        """Best-effort: read last detected version from boot_state."""
        dm = getattr(self.bot, "data_manager", None)
        if not dm:
            return None
        try:
            st = (dm.get('boot_state') or [{}])[-1] if dm.get('boot_state') else {}
            v = st.get('last_version')
            return v if v else None
        except Exception:
            return None

    async def _do_restart(self, delay: float = 2.0):
        if self._restarting:
            return
        self._restarting = True
        try:
            await asyncio.sleep(delay)
            # Graceful close first
            try:
                await self.bot.close()
            except Exception as e:
                print("[bot_restart] bot.close() raised:", repr(e))
            # Hard exit so container/wrapper restarts us
            os._exit(0)  # noqa: E999
        except Exception as e:
            print("[bot_restart] restart sequence failed:", repr(e))
            # As a last resort, still try to exit
            try:
                os._exit(1)
            except Exception:
                pass

    @app_commands.command(name="bot_restart", description="(Mod-only) Restart the bot with a descriptive reason.")
    @app_commands.describe(reason="Explain why a restart is necessary (be specific).")
    async def bot_restart(self, interaction: discord.Interaction, reason: str):
        # Mods only
        if not await require_mod_interaction(interaction):
            return

        ok, err = _reason_ok(reason)
        if not ok:
            return await interaction.response.send_message(f"❌ {err}", ephemeral=True)

        # Ack immediately to avoid 'interaction failed'
        await interaction.response.send_message("🔁 Restart requested — posting to modlog and restarting shortly…", ephemeral=True)

        guild = interaction.guild
        stamp = _now_utc_str()
        ver = self._current_version() or "unknown"

        log = (
            "🔁 **Bot Restart Requested**\n"
            f"**By:** {interaction.user.mention}\n"
            f"**When:** {stamp}\n"
            f"**Running version:** `{ver}`\n"
            f"**Reason:** {reason.strip()}"
        )
        if guild:
            await self._send_modlog(guild, log)
        else:
            print("[bot_restart] no guild found on interaction; modlog not sent.")

        # small delay to let the modlog flush across the gateway
        await self._do_restart(delay=2.0)

async def setup(bot: commands.Bot):
    cog = BotRestartCog(bot)
    await bot.add_cog(cog)

    # Idempotent (re)registration following your existing pattern
    home_gid = cfg(bot).int('home_guild_id', 0)
    guild_obj = discord.Object(id=home_gid) if home_gid else None

    def _rm(name: str):
        try:
            bot.tree.remove_command(name, guild=guild_obj)
        except Exception:
            try:
                bot.tree.remove_command(name, guild=None)
            except Exception:
                pass

    _rm("bot_restart")
    if home_gid:
        bot.tree.add_command(cog.bot_restart, guild=guild_obj)
    else:
        bot.tree.add_command(cog.bot_restart)