# agent/integrations/discord_handler.py
"""Discord Bot Gateway 수신 핸들러.

discord.py를 사용하여 @agent 멘션을 수신하고 작업을 큐에 추가한다.
"""
from __future__ import annotations

import hashlib
import logging
import os
import re

import discord
from discord.ext import commands

logger = logging.getLogger(__name__)


def parse_discord_message(content: str, bot_user_id: int) -> dict:
    """Discord 메시지를 파싱하여 작업 정보를 추출한다."""
    # 봇 멘션 제거 (<@123456>)
    cleaned = re.sub(rf"<@!?{bot_user_id}>", "", content).strip()

    # 이슈 번호 추출
    issue_match = re.search(r"#(\d+)", cleaned)
    issue_number = int(issue_match.group(1)) if issue_match else 0

    # 리포 이름 추출
    repo_name = os.environ.get("DEFAULT_REPO_NAME", "galaxis-po")
    repo_match = re.search(r"\b(galaxis-\w+)\b", cleaned)
    if repo_match:
        repo_name = repo_match.group(1)

    # 순수 메시지
    message = re.sub(r"@agent\b", "", cleaned, flags=re.IGNORECASE)
    message = re.sub(rf"\b{re.escape(repo_name)}\b", "", message)
    message = re.sub(r"이슈\s*#\d+", "", message)
    message = re.sub(r"#\d+", "", message)
    message = message.strip()

    return {
        "issue_number": issue_number,
        "repo_name": repo_name,
        "message": message or cleaned,
    }


def generate_discord_thread_id(channel_id: int, message_id: int) -> str:
    """Discord 메시지에서 결정론적 스레드 ID를 생성한다."""
    raw = hashlib.sha256(f"discord:{channel_id}:{message_id}".encode()).hexdigest()
    return f"{raw[:8]}-{raw[8:12]}-{raw[12:16]}-{raw[16:20]}-{raw[20:32]}"


class DiscordHandler:
    """Discord Bot Gateway 핸들러."""

    def __init__(self):
        intents = discord.Intents.default()
        intents.message_content = True
        intents.guild_messages = True
        self.bot = commands.Bot(command_prefix="!", intents=intents)
        self._setup_events()

    def _setup_events(self):
        @self.bot.event
        async def on_ready():
            logger.info("Discord bot connected as %s", self.bot.user)

        @self.bot.event
        async def on_message(message: discord.Message):
            if message.author == self.bot.user:
                return
            if not self.bot.user or not self.bot.user.mentioned_in(message):
                return
            await self._handle_mention(message)

    async def _handle_mention(self, message: discord.Message):
        """@agent 멘션을 처리한다."""
        parsed = parse_discord_message(
            message.content, self.bot.user.id if self.bot.user else 0
        )
        thread_id = generate_discord_thread_id(message.channel.id, message.id)
        repo_owner = os.environ.get("DEFAULT_REPO_OWNER", "quant")

        from agent.task_queue import get_task_queue
        from agent.message_store import get_message_store

        task_queue = await get_task_queue()

        if parsed["issue_number"] and await task_queue.has_running_task(thread_id):
            store = await get_message_store()
            await store.push_message(thread_id, {
                "role": "human",
                "content": parsed["message"],
            })
            await message.reply("메시지를 대기열에 추가했습니다. 현재 작업이 완료되면 확인하겠습니다.")
            return

        task_id = await task_queue.enqueue(
            thread_id=thread_id,
            source="discord",
            payload={
                "issue_number": parsed["issue_number"],
                "repo_owner": repo_owner,
                "repo_name": parsed["repo_name"],
                "message": parsed["message"],
                "channel_id": str(message.channel.id),
                "message_id": str(message.id),
            },
        )
        await message.reply(f"작업을 대기열에 추가했습니다. (task: {task_id[:8]})")
        logger.info("Discord task enqueued: %s (thread %s)", task_id, thread_id)

    async def start(self, token: str):
        """Bot Gateway를 시작한다."""
        await self.bot.start(token)

    async def close(self):
        """Bot Gateway를 종료한다."""
        await self.bot.close()