import logging
from typing import Optional

from aiogram import F, Router, types
from sqlalchemy.ext.asyncio import AsyncSession

from bot.keyboards.inline.user_keyboards import get_payment_url_keyboard
from bot.middlewares.i18n import JsonI18n
from bot.services.severpay_service import SeverPayService
from config.settings import Settings
from db.dal import payment_dal
from bot.handlers.user.subscription.payment_discount_helper import apply_discount_to_payment

router = Router(name="user_subscription_payments_severpay_router")


@router.callback_query(F.data.startswith("pay_severpay:"))
async def pay_severpay_callback_handler(
    callback: types.CallbackQuery,
    settings: Settings,
    i18n_data: dict,
    severpay_service: SeverPayService,
    session: AsyncSession,
    promo_code_service=None,
):
    current_lang = i18n_data.get("current_language", settings.DEFAULT_LANGUAGE)
    i18n: Optional[JsonI18n] = i18n_data.get("i18n_instance")
    get_text = lambda key, **kwargs: i18n.gettext(current_lang, key, **kwargs) if i18n else key

    if not i18n or not callback.message:
        try:
            await callback.answer(get_text("error_occurred_try_again"), show_alert=True)
        except Exception:
            pass
        return

    if not severpay_service or not severpay_service.configured:
        logging.error("SeverPay service is not configured or unavailable.")
        try:
            await callback.answer(get_text("payment_service_unavailable_alert"), show_alert=True)
        except Exception:
            pass
        try:
            await callback.message.edit_text(get_text("payment_service_unavailable"))
        except Exception:
            pass
        return

    try:
        _, data_payload = callback.data.split(":", 1)
        parts = data_payload.split(":")
        months = float(parts[0])
        price_rub = float(parts[1])
        sale_mode = parts[2] if len(parts) > 2 else "subscription"
    except (ValueError, IndexError):
        logging.error(f"Invalid pay_severpay data in callback: {callback.data}")
        try:
            await callback.answer(get_text("error_try_again"), show_alert=True)
        except Exception:
            pass
        return

    user_id = callback.from_user.id
    human_value = str(int(months)) if float(months).is_integer() else f"{months:g}"
    payment_description = (
        get_text("payment_description_traffic", traffic_gb=human_value)
        if sale_mode == "traffic"
        else get_text("payment_description_subscription", months=int(months))
    )
    currency_code = settings.DEFAULT_CURRENCY_SYMBOL or "RUB"

    # Apply active discount if exists
    final_price_rub, discount_amount, promo_code_id = await apply_discount_to_payment(
        session, user_id, price_rub, promo_code_service
    )

    payment_record_payload = {
        "user_id": user_id,
        "amount": final_price_rub,
        "original_amount": price_rub if discount_amount else None,
        "discount_applied": discount_amount,
        "currency": currency_code,
        "status": "pending_severpay",
        "description": payment_description,
        "subscription_duration_months": int(months),
        "provider": "severpay",
        "promo_code_id": promo_code_id,
    }

    try:
        payment_record = await payment_dal.create_payment_record(session, payment_record_payload)
        await session.commit()
    except Exception as e_db_create:
        await session.rollback()
        logging.error(
            f"SeverPay: failed to create payment record for user {user_id}: {e_db_create}",
            exc_info=True,
        )
        try:
            await callback.message.edit_text(get_text("error_creating_payment_record"))
        except Exception:
            pass
        try:
            await callback.answer(get_text("error_try_again"), show_alert=True)
        except Exception:
            pass
        return

    success, response_data = await severpay_service.create_payment(
        payment_db_id=payment_record.payment_id,
        user_id=user_id,
        months=months,
        amount=final_price_rub,
        currency=currency_code,
        description=payment_description,
    )

    if success:
        payment_link = (
            response_data.get("url")
            or response_data.get("payment_url")
            or response_data.get("paymentUrl")
        )
        provider_identifier = response_data.get("id") or response_data.get("uid")

        if provider_identifier:
            try:
                await payment_dal.update_provider_payment_and_status(
                    session,
                    payment_record.payment_id,
                    str(provider_identifier),
                    payment_record.status,
                )
                await session.commit()
            except Exception as e_status:
                await session.rollback()
                logging.error(
                    f"SeverPay: failed to store provider payment id for payment {payment_record.payment_id}: {e_status}",
                    exc_info=True,
                )

        if payment_link:
            try:
                await callback.message.edit_text(
                    get_text(
                        key="payment_link_message_traffic" if sale_mode == "traffic" else "payment_link_message",
                        months=int(months),
                        traffic_gb=human_value,
                    ),
                    reply_markup=get_payment_url_keyboard(
                        payment_link,
                        current_lang,
                        i18n,
                        back_callback=f"subscribe_period:{human_value}",
                        back_text_key="back_to_payment_methods_button",
                    ),
                    disable_web_page_preview=False,
                )
            except Exception as e_edit:
                logging.warning(f"SeverPay: failed to display payment link ({e_edit}), sending new message.")
                try:
                    await callback.message.answer(
                        get_text(
                            key="payment_link_message_traffic" if sale_mode == "traffic" else "payment_link_message",
                            months=int(months),
                            traffic_gb=human_value,
                        ),
                        reply_markup=get_payment_url_keyboard(
                            payment_link,
                            current_lang,
                            i18n,
                            back_callback=f"subscribe_period:{human_value}",
                            back_text_key="back_to_payment_methods_button",
                        ),
                        disable_web_page_preview=False,
                    )
                except Exception:
                    pass
            try:
                await callback.answer()
            except Exception:
                pass
            return

        logging.error(
            "SeverPay: payment created but missing payment link for payment %s. Response: %s",
            payment_record.payment_id,
            response_data,
        )

    try:
        await payment_dal.update_payment_status_by_db_id(
            session,
            payment_record.payment_id,
            "failed_creation",
        )
        await session.commit()
    except Exception as e_status:
        await session.rollback()
        logging.error(f"SeverPay: failed to mark payment {payment_record.payment_id} as failed_creation: {e_status}", exc_info=True)

    try:
        await callback.message.edit_text(get_text("error_payment_gateway"))
    except Exception:
        pass
    try:
        await callback.answer(get_text("error_payment_gateway"), show_alert=True)
    except Exception:
        pass