"""Mixin for integrating CloudPayments into the payment service."""

from __future__ import annotations

import json
from datetime import datetime
from importlib import import_module
from typing import Any, Dict, Optional

from sqlalchemy.ext.asyncio import AsyncSession

from app.config import settings
from app.database.models import PaymentMethod, TransactionType
from app.services.subscription_auto_purchase_service import (
    auto_activate_subscription_after_topup,
    auto_purchase_saved_cart_after_topup,
)
from app.services.cloudpayments_service import CloudPaymentsAPIError, CloudPaymentsService
from app.utils.user_utils import format_referrer_info
from app.utils.payment_logger import payment_logger as logger


class CloudPaymentsPaymentMixin:
    """Encapsulates creation and webhook handling for CloudPayments."""

    async def create_cloudpayments_payment(
        self,
        db: AsyncSession,
        user_id: int,
        amount_kopeks: int,
        description: str,
        *,
        telegram_id: int,
        language: Optional[str] = None,
        email: Optional[str] = None,
    ) -> Optional[Dict[str, Any]]:
        """
        Create a CloudPayments payment and return payment link info.

        Args:
            db: Database session
            user_id: Internal user ID
            amount_kopeks: Payment amount in kopeks
            description: Payment description
            telegram_id: User's Telegram ID
            language: User's language
            email: User's email (optional)

        Returns:
            Dict with payment_url and invoice_id, or None on error
        """
        if not getattr(self, "cloudpayments_service", None):
            logger.error("CloudPayments service is not initialised")
            return None

        if amount_kopeks < settings.CLOUDPAYMENTS_MIN_AMOUNT_KOPEKS:
            logger.warning(
                "Сумма CloudPayments меньше минимальной: %s < %s",
                amount_kopeks,
                settings.CLOUDPAYMENTS_MIN_AMOUNT_KOPEKS,
            )
            return None

        if amount_kopeks > settings.CLOUDPAYMENTS_MAX_AMOUNT_KOPEKS:
            logger.warning(
                "Сумма CloudPayments больше максимальной: %s > %s",
                amount_kopeks,
                settings.CLOUDPAYMENTS_MAX_AMOUNT_KOPEKS,
            )
            return None

        payment_module = import_module("app.services.payment_service")

        # Generate unique invoice ID
        invoice_id = self.cloudpayments_service.generate_invoice_id(telegram_id)

        try:
            # Create payment order via CloudPayments API
            payment_url = await self.cloudpayments_service.generate_payment_link(
                telegram_id=telegram_id,
                amount_kopeks=amount_kopeks,
                invoice_id=invoice_id,
                description=description,
                email=email,
            )
        except CloudPaymentsAPIError as error:
            logger.error("Ошибка создания CloudPayments платежа: %s", error)
            return None
        except Exception as error:
            logger.exception("Непредвиденная ошибка при создании CloudPayments платежа: %s", error)
            return None

        metadata = {
            "language": language or settings.DEFAULT_LANGUAGE,
            "telegram_id": telegram_id,
        }

        # Create local payment record
        local_payment = await payment_module.create_cloudpayments_payment(
            db=db,
            user_id=user_id,
            invoice_id=invoice_id,
            amount_kopeks=amount_kopeks,
            description=description,
            payment_url=payment_url,
            metadata=metadata,
            test_mode=settings.CLOUDPAYMENTS_TEST_MODE,
        )

        if not local_payment:
            logger.error("Не удалось создать локальную запись CloudPayments платежа")
            return None

        logger.info(
            "Создан CloudPayments платёж: invoice=%s, amount=%s₽, user=%s",
            invoice_id,
            amount_kopeks / 100,
            user_id,
        )

        return {
            "payment_url": payment_url,
            "invoice_id": invoice_id,
            "payment_id": local_payment.id,
        }

    async def process_cloudpayments_pay_webhook(
        self,
        db: AsyncSession,
        webhook_data: Dict[str, Any],
    ) -> bool:
        """
        Process CloudPayments Pay webhook (successful payment).

        Args:
            db: Database session
            webhook_data: Parsed webhook data

        Returns:
            True if payment was processed successfully
        """
        invoice_id = webhook_data.get("invoice_id")
        transaction_id_cp = webhook_data.get("transaction_id")
        amount = webhook_data.get("amount", 0)
        amount_kopeks = int(amount * 100)
        account_id = webhook_data.get("account_id", "")
        token = webhook_data.get("token")
        test_mode = webhook_data.get("test_mode", False)

        if not invoice_id:
            logger.error("CloudPayments webhook без invoice_id")
            return False

        payment_module = import_module("app.services.payment_service")

        # Find existing payment record
        payment = await payment_module.get_cloudpayments_payment_by_invoice_id(db, invoice_id)

        if not payment:
            logger.warning(
                "CloudPayments платёж не найден: invoice=%s, создаём новый",
                invoice_id,
            )
            # Try to extract telegram_id from account_id
            try:
                telegram_id = int(account_id) if account_id else None
            except ValueError:
                telegram_id = None

            if not telegram_id:
                logger.error("Не удалось определить telegram_id из account_id: %s", account_id)
                return False

            # Get user by telegram_id
            from app.database.crud.user import get_user_by_telegram_id
            user = await get_user_by_telegram_id(db, telegram_id)
            if not user:
                logger.error("Пользователь не найден: telegram_id=%s", telegram_id)
                return False

            # Create payment record
            payment = await payment_module.create_cloudpayments_payment(
                db=db,
                user_id=user.id,
                invoice_id=invoice_id,
                amount_kopeks=amount_kopeks,
                description=settings.CLOUDPAYMENTS_DESCRIPTION,
                test_mode=test_mode,
            )

            if not payment:
                logger.error("Не удалось создать запись платежа")
                return False

        # Check if already processed
        if payment.is_paid:
            logger.info("CloudPayments платёж уже обработан: invoice=%s", invoice_id)
            return True

        # Update payment record
        payment.transaction_id_cp = transaction_id_cp
        payment.status = "completed"
        payment.is_paid = True
        payment.paid_at = datetime.utcnow()
        payment.token = token
        payment.card_first_six = webhook_data.get("card_first_six")
        payment.card_last_four = webhook_data.get("card_last_four")
        payment.card_type = webhook_data.get("card_type")
        payment.card_exp_date = webhook_data.get("card_exp_date")
        payment.email = webhook_data.get("email")
        payment.test_mode = test_mode
        payment.callback_payload = webhook_data

        await db.flush()

        # Get user
        from app.database.crud.user import get_user_by_id, add_user_balance
        user = await get_user_by_id(db, payment.user_id)

        if not user:
            logger.error("Пользователь не найден: id=%s", payment.user_id)
            return False

        # Add balance
        await add_user_balance(db, user.id, amount_kopeks)

        # Create transaction record
        from app.database.crud.transaction import create_transaction
        transaction = await create_transaction(
            db=db,
            user_id=user.id,
            type_=TransactionType.DEPOSIT,
            amount_kopeks=amount_kopeks,
            description=payment.description or settings.CLOUDPAYMENTS_DESCRIPTION,
            payment_method=PaymentMethod.CLOUDPAYMENTS,
            external_id=str(transaction_id_cp) if transaction_id_cp else invoice_id,
            is_completed=True,
        )

        payment.transaction_id = transaction.id
        await db.commit()

        logger.info(
            "CloudPayments платёж успешно обработан: invoice=%s, amount=%s₽, user=%s",
            invoice_id,
            amount_kopeks / 100,
            user.telegram_id,
        )

        # Send notification to user
        try:
            await self._send_cloudpayments_success_notification(
                user=user,
                amount_kopeks=amount_kopeks,
                transaction=transaction,
            )
        except Exception as error:
            logger.exception("Ошибка отправки уведомления CloudPayments: %s", error)

        # Auto-purchase if enabled
        auto_purchase_success = False
        try:
            auto_purchase_success = await auto_purchase_saved_cart_after_topup(db, user)
        except Exception as error:
            logger.exception("Ошибка автопокупки после CloudPayments: %s", error)

        # Умная автоактивация если автопокупка не сработала
        if not auto_purchase_success:
            try:
                # Игнорируем notification_sent т.к. здесь нет дополнительных уведомлений
                await auto_activate_subscription_after_topup(
                    db, user, bot=getattr(self, "bot", None), topup_amount=amount_kopeks
                )
            except Exception as error:
                logger.exception("Ошибка умной автоактивации после CloudPayments: %s", error)

        return True

    async def process_cloudpayments_fail_webhook(
        self,
        db: AsyncSession,
        webhook_data: Dict[str, Any],
    ) -> bool:
        """
        Process CloudPayments Fail webhook (failed payment).

        Args:
            db: Database session
            webhook_data: Parsed webhook data

        Returns:
            True if processed successfully
        """
        invoice_id = webhook_data.get("invoice_id")
        reason = webhook_data.get("reason", "Unknown")
        reason_code = webhook_data.get("reason_code")
        card_holder_message = webhook_data.get("card_holder_message", reason)
        account_id = webhook_data.get("account_id", "")

        if not invoice_id:
            logger.warning("CloudPayments fail webhook без invoice_id")
            return True

        payment_module = import_module("app.services.payment_service")

        # Find payment record
        payment = await payment_module.get_cloudpayments_payment_by_invoice_id(db, invoice_id)

        if payment:
            payment.status = "failed"
            payment.callback_payload = webhook_data
            await db.commit()

        logger.info(
            "CloudPayments платёж неуспешен: invoice=%s, reason=%s (code=%s)",
            invoice_id,
            reason,
            reason_code,
        )

        # Notify user about failed payment
        try:
            telegram_id = int(account_id) if account_id else None
            if telegram_id:
                await self._send_cloudpayments_fail_notification(
                    telegram_id=telegram_id,
                    message=card_holder_message,
                )
        except Exception as error:
            logger.exception("Ошибка отправки уведомления о неуспешном платеже: %s", error)

        return True

    async def _send_cloudpayments_success_notification(
        self,
        user: Any,
        amount_kopeks: int,
        transaction: Any,
    ) -> None:
        """Send success notification to user via Telegram."""
        from app.bot import bot
        from app.localization.texts import get_texts

        if not bot:
            return

        texts = get_texts(user.language)
        keyboard = await self.build_topup_success_keyboard(user)

        referrer_info = format_referrer_info(user)

        amount_rub = amount_kopeks / 100
        new_balance = user.balance_kopeks / 100

        message = texts.t(
            "PAYMENT_SUCCESS_CLOUDPAYMENTS",
            "✅ <b>Оплата получена!</b>\n\n"
            "💰 Сумма: {amount}₽\n"
            "💳 Способ: CloudPayments\n"
            "💵 Баланс: {balance}₽\n\n"
            "Спасибо за пополнение!",
        ).format(
            amount=f"{amount_rub:.2f}",
            balance=f"{new_balance:.2f}",
        )

        if referrer_info:
            message += f"\n\n{referrer_info}"

        try:
            await bot.send_message(
                chat_id=user.telegram_id,
                text=message,
                parse_mode="HTML",
                reply_markup=keyboard,
            )
        except Exception as error:
            logger.warning("Не удалось отправить уведомление пользователю %s: %s", user.telegram_id, error)

    async def _send_cloudpayments_fail_notification(
        self,
        telegram_id: int,
        message: str,
    ) -> None:
        """Send failure notification to user via Telegram."""
        from app.bot import bot

        if not bot:
            return

        text = f"❌ <b>Оплата не прошла</b>\n\n{message}"

        try:
            await bot.send_message(
                chat_id=telegram_id,
                text=text,
                parse_mode="HTML",
            )
        except Exception as error:
            logger.warning("Не удалось отправить уведомление пользователю %s: %s", telegram_id, error)

    async def get_cloudpayments_payment_status(
        self,
        db: AsyncSession,
        local_payment_id: int,
    ) -> Optional[Dict[str, Any]]:
        """
        Check CloudPayments payment status via API.

        Args:
            db: Database session
            local_payment_id: Internal payment ID

        Returns:
            Dict with payment info or None if not found
        """
        payment_module = import_module("app.services.payment_service")

        # Get local payment record
        payment = await payment_module.get_cloudpayments_payment_by_id(db, local_payment_id)
        if not payment:
            logger.warning("CloudPayments payment not found: id=%s", local_payment_id)
            return None

        # If already paid, return current state
        if payment.is_paid:
            return {"payment": payment, "status": "completed"}

        # Check with CloudPayments API
        if not getattr(self, "cloudpayments_service", None):
            logger.warning("CloudPayments service not initialized")
            return {"payment": payment, "status": payment.status}

        try:
            # Try to find payment by invoice_id
            api_response = await self.cloudpayments_service.find_payment(payment.invoice_id)

            if not api_response.get("Success"):
                logger.debug(
                    "CloudPayments API: payment not found or error for invoice=%s",
                    payment.invoice_id,
                )
                return {"payment": payment, "status": payment.status}

            model = api_response.get("Model", {})
            api_status = model.get("Status", "")
            transaction_id_cp = model.get("TransactionId")

            # Update local record if status changed
            if api_status == "Completed" and not payment.is_paid:
                # Payment completed - process it
                webhook_data = {
                    "invoice_id": payment.invoice_id,
                    "transaction_id": transaction_id_cp,
                    "amount": model.get("Amount", 0),
                    "account_id": model.get("AccountId", ""),
                    "token": model.get("Token"),
                    "card_first_six": model.get("CardFirstSix"),
                    "card_last_four": model.get("CardLastFour"),
                    "card_type": model.get("CardType"),
                    "card_exp_date": model.get("CardExpDate"),
                    "email": model.get("Email"),
                    "test_mode": model.get("TestMode", False),
                    "status": api_status,
                }
                await self.process_cloudpayments_pay_webhook(db, webhook_data)
                await db.refresh(payment)

            elif api_status in ("Declined", "Cancelled") and payment.status not in ("failed", "cancelled"):
                payment.status = "failed"
                await db.flush()
                await db.refresh(payment)

            return {"payment": payment, "status": payment.status}

        except Exception as error:
            logger.error(
                "Error checking CloudPayments payment status: id=%s, error=%s",
                local_payment_id,
                error,
            )
            return {"payment": payment, "status": payment.status}