import logging
from aiogram import Router, types, Bot
from aiogram.filters import Command
from typing import Optional

from config.settings import Settings
from bot.services.panel_api_service import PanelApiService

from db.database import update_sync_status, get_last_sync_status, sync_panel_user_data
from bot.middlewares.i18n import JsonI18n
from bot.keyboards.inline.admin_keyboards import get_back_to_admin_panel_keyboard

router = Router(name="admin_sync_router")


@router.message(Command("sync"))
async def sync_command_handler(message: types.Message, bot: Bot,
                               settings: Settings, i18n_data: dict,
                               panel_service: PanelApiService):
    current_lang = i18n_data.get("current_language",
                                 getattr(settings, 'DEFAULT_LANGUAGE', 'en'))
    i18n: Optional[JsonI18n] = i18n_data.get("i18n_instance")
    if not i18n:
        logging.error("i18n missing")
        await message.answer("Language error.")
        return
    _ = lambda key, **kwargs: i18n.gettext(current_lang, key, **kwargs)

    await message.answer(_("sync_started"))
    logging.info("Admin triggered panel sync.")

    users_processed_count = 0
    users_synced_successfully = 0
    sync_errors = []

    try:
        panel_users_data = await panel_service.get_all_panel_users()

        if panel_users_data is None:
            error_msg = "Failed to fetch users from panel or panel API issue."
            sync_errors.append(error_msg)
            await update_sync_status("failed", error_msg)
            await message.answer(_("sync_failed", details=error_msg))
            return

        if not panel_users_data:
            status_msg = "No users found in the panel to sync."
            await update_sync_status("success", status_msg, 0, 0)
            await message.answer(
                _("sync_completed", status="Success", details=status_msg))
            return

        total_panel_users = len(panel_users_data)
        logging.info(f"Starting sync for {total_panel_users} panel users.")

        for panel_user_dict in panel_users_data:
            users_processed_count += 1
            telegram_id_from_panel = panel_user_dict.get('telegramId')
            panel_uuid = panel_user_dict.get('uuid')

            if not telegram_id_from_panel:
                logging.info(
                    f"Panel user {panel_uuid} (username: {panel_user_dict.get('username')}) has no 'telegramId'. Skipping TG ID based sync."
                )

                continue

            if not panel_uuid:
                logging.warning(
                    f"Panel user (TG ID: {telegram_id_from_panel}) missing 'uuid'. Skipping."
                )
                sync_errors.append(
                    f"Panel user data for TG ID {telegram_id_from_panel} missing UUID."
                )
                continue

            if await sync_panel_user_data(panel_user_dict):
                users_synced_successfully += 1
            else:
                sync_errors.append(
                    f"Sync issue for panel user: {panel_uuid} (TG ID: {telegram_id_from_panel})"
                )

            if users_processed_count % 20 == 0:
                logging.info(
                    f"Sync progress: {users_processed_count}/{total_panel_users} users processed."
                )

        status_msg = f"Panel users checked: {total_panel_users}. Users/Subscriptions synced via TG ID: {users_synced_successfully}."
        if sync_errors:
            status_msg += f" Errors encountered: {len(sync_errors)}. See logs for details."
            error_preview = "\n".join(sync_errors[:3])
            await update_sync_status("partial_success",
                                     status_msg + " " + error_preview,
                                     total_panel_users,
                                     users_synced_successfully)
            await message.answer(
                _("sync_completed",
                  status="Partial Success",
                  details=status_msg))
        else:
            await update_sync_status("success", status_msg, total_panel_users,
                                     users_synced_successfully)
            await message.answer(
                _("sync_completed", status="Success", details=status_msg))

    except Exception as e:
        logging.error(f"Error during /sync command: {e}", exc_info=True)
        error_detail = f"An unexpected error occurred during sync: {str(e)}"
        await update_sync_status("failed", error_detail, users_processed_count,
                                 users_synced_successfully)
        await message.answer(_("sync_failed", details=error_detail))


@router.message(Command("syncstatus"))
async def sync_status_command_handler(message: types.Message, i18n_data: dict,
                                      settings: Settings):

    current_lang = i18n_data.get("current_language",
                                 getattr(settings, 'DEFAULT_LANGUAGE', 'en'))
    i18n: Optional[JsonI18n] = i18n_data.get("i18n_instance")
    if not i18n:
        await message.answer("Language error.")
        return
    _ = lambda key, **kwargs: i18n.gettext(current_lang, key, **kwargs)
    status_record = await get_last_sync_status()
    response_text = ""
    if status_record:
        last_time_val = status_record['last_sync_time']
        last_time_str = last_time_val.strftime(
            '%Y-%m-%d %H:%M:%S UTC') if isinstance(
                last_time_val, datetime) else str(last_time_val)
        if isinstance(last_time_str, str) and len(last_time_str) > 19:
            last_time_str = last_time_str[:19]
        details_val = status_record['details']
        details_str = (details_val[:200] +
                       "...") if details_val and len(details_val) > 200 else (
                           details_val or "N/A")
        response_text = (
            f"<b>{_('admin_stats_last_sync_header')}</b>\n"
            f"  {_('admin_stats_sync_time')}: {last_time_str}\n"
            f"  {_('admin_stats_sync_status')}: {status_record['status']}\n"
            f"  {_('admin_stats_sync_users_processed')}: {status_record['users_processed_from_panel']}\n"
            f"  {_('admin_stats_sync_subs_synced')}: {status_record['subscriptions_synced']}\n"
            f"  {_('admin_stats_sync_details_label')}: {details_str}")
    else:
        response_text = _("admin_sync_status_never_run")
    await message.answer(response_text, parse_mode="HTML")