"""Handlers for the semipublic chatroom and backup group."""
import asyncio
import logging

from aiogram import F, Router, types
from aiogram.filters import Command

import bot_state as state_store
from config import (
    BLACKLIST_MODE,
    CHATROOM_PRIVATE_BACKUP_GROUP_ID,
    CHATROOM_SEMIPUBLIC_GROUP_ID,
    PURGE_INTERVAL_HOURS,
    INVITELINK_ARCH,
    INVITELINK_CHAT,
    BOT_USERNAME,
)
from filters import contains_link, process_blacklisted_message
from hashing import register_file
from utils import is_group_admin

logger = logging.getLogger(__name__)
router = Router(name="group")

# ── Background purge task ─────────────────────────────────────────────────────

async def purge_chatroom_semipublic_group(bot) -> None:
    while True:
        await asyncio.sleep(PURGE_INTERVAL_HOURS * 3600)
        for message_id, is_bot_msg in list(state_store.chatroom_semipublic_group_messages.items()):
            if is_bot_msg:
                continue
            try:
                await bot.delete_message(CHATROOM_SEMIPUBLIC_GROUP_ID, message_id)
            except Exception:
                pass
            state_store.chatroom_semipublic_group_messages.pop(message_id, None)

# ── Backup-group tracker ──────────────────────────────────────────────────────

@router.message(F.chat.id == CHATROOM_PRIVATE_BACKUP_GROUP_ID)
async def track_backup_group(message: types.Message):
    if message.photo:
        register_file(message.photo[-1].file_unique_id)
    elif message.video:
        register_file(message.video.file_unique_id)
    elif message.document:
        register_file(message.document.file_unique_id)


@router.message(
    F.chat.id == CHATROOM_PRIVATE_BACKUP_GROUP_ID,
    Command("reindex"),
)
async def reindex_backup(message: types.Message):
    if not await is_group_admin(message.bot, CHATROOM_PRIVATE_BACKUP_GROUP_ID, message.from_user.id):
        return
    count = len(state_store.backup_hashes)
    await message.reply(
        f"ℹ️ Currently <b>{count}</b> files indexed in the hash cache.\n\n"
        "The Bot API does not expose a bulk message history endpoint. "
        "To do a full historical reindex, forward all older media back into "
        "this group — the bot will register each file automatically as it arrives.",
        parse_mode="HTML",
    )

# ── Welcome / join request ────────────────────────────────────────────────────

@router.message(F.new_chat_members)
async def welcome(message: types.Message):
    async with state_store.welcome_lock:
        try:
            await message.delete()
        except Exception:
            pass
        for mid in state_store.welcome_messages.get(message.chat.id, []):
            try:
                await message.bot.delete_message(message.chat.id, mid)
            except Exception:
                pass
        sent = []
        for user in message.new_chat_members:
            mention = (
                f'@{user.username}' if user.username else str(user.id)
            )
            text = (
                f"{mention} welcome to the official s3lfharm archive.\n\n"
                "You can view media by checking pinned messages or the media section.\n\n"
                "Feel free to share your own s3lfharm imagery using "
                f'<a href="https://t.me/{BOT_USERNAME}">this bot</a>.\n\n'
                f'\U0001f48b <a href="{INVITELINK_ARCH}">Join the public archive</a>\n\n'
                f'<blockquote>S3LF HARM</blockquote>'
            )
            try:
                msg = await message.bot.send_message(
                    message.chat.id,
                    text,
                    parse_mode="HTML",
                    disable_web_page_preview=True,
                )
                sent.append(msg.message_id)
            except Exception:
                logger.exception("Failed to send welcome in %s", message.chat.id)
        state_store.welcome_messages[message.chat.id] = sent


@router.chat_join_request()
async def auto_approve_join_request(request: types.ChatJoinRequest):
    try:
        await request.bot.approve_chat_join_request(request.chat.id, request.from_user.id)
        logger.info("Approved user %s to join %s", request.from_user.id, request.chat.id)
    except Exception:
        logger.exception("Failed to approve join request from %s", request.from_user.id)

# ── Auto-delete Telegram service/system messages in semipublic group ──────────

@router.message(
    F.chat.id == CHATROOM_SEMIPUBLIC_GROUP_ID,
    F.content_type.in_({
        types.ContentType.NEW_CHAT_MEMBERS,
        types.ContentType.LEFT_CHAT_MEMBER,
        types.ContentType.NEW_CHAT_TITLE,
        types.ContentType.NEW_CHAT_PHOTO,
        types.ContentType.DELETE_CHAT_PHOTO,
        types.ContentType.GROUP_CHAT_CREATED,
        types.ContentType.SUPERGROUP_CHAT_CREATED,
        types.ContentType.MESSAGE_AUTO_DELETE_TIMER_CHANGED,
        types.ContentType.PINNED_MESSAGE,
    }),
)
async def delete_service_messages(message: types.Message):
    try:
        await message.delete()
    except Exception:
        pass

# ── Semipublic group moderation ───────────────────────────────────────────────

@router.message(F.chat.id == CHATROOM_SEMIPUBLIC_GROUP_ID)
async def handle_semipublic_message(message: types.Message):
    state_store.chatroom_semipublic_group_messages[message.message_id] = bool(
        message.from_user and message.from_user.is_bot
    )

    if not message.from_user or message.from_user.is_bot:
        return

    # ── Define text first ────────────────────────────────────────────────────
    text = message.text or message.caption or ""

    # ── Blacklist check (all users including admins) ──────────────────────────
    censored_text, was_censored = process_blacklisted_message(text)
    if was_censored:
        try:
            await message.delete()
        except Exception:
            pass
        sender = (
            f'@{message.from_user.username}'
            if message.from_user.username
            else str(message.from_user.id)
        )
        if BLACKLIST_MODE == 1:
            try:
                await message.bot.send_message(
                    CHATROOM_SEMIPUBLIC_GROUP_ID,
                    f"Censored text from {sender} →\n<blockquote>{censored_text}</blockquote>",
                    parse_mode="HTML",
                )
            except Exception:
                logger.exception("Failed to send censor notice")
        return

    # ── Link check — admins are fully exempt ─────────────────────────────────
    if await is_group_admin(message.bot, CHATROOM_SEMIPUBLIC_GROUP_ID, message.from_user.id):
        return  # admin: keep message as-is, no further checks

    has_link_entity = any(
        e.type in ("url", "text_link")
        for e in (message.entities or []) + (message.caption_entities or [])
    )
    if has_link_entity or contains_link(text):
        try:
            await message.delete()
        except Exception:
            pass