import hashlib
import hmac
import json
from typing import Any

import structlog

from app.config import settings


logger = structlog.get_logger(__name__)


class TributeService:
    def __init__(self):
        self.api_key = settings.TRIBUTE_API_KEY
        self.donate_link = settings.TRIBUTE_DONATE_LINK

    async def create_payment_link(
        self, user_id: int, amount_kopeks: int = 0, description: str = 'Пополнение баланса'
    ) -> str | None:
        if not settings.TRIBUTE_ENABLED:
            logger.warning('Tribute платежи отключены')
            return None

        try:
            payment_url = f'{self.donate_link}&user_id={user_id}'

            logger.info('Создана ссылка Tribute для пользователя', user_id=user_id)
            return payment_url

        except Exception as e:
            logger.error('Ошибка создания Tribute ссылки', error=e)
            return None

    def verify_webhook_signature(self, payload: str, signature: str) -> bool:
        if not self.api_key:
            logger.error('Tribute API key не настроен — отклоняем webhook')
            return False

        try:
            expected_signature = hmac.new(self.api_key.encode(), payload.encode(), hashlib.sha256).hexdigest()

            is_valid = hmac.compare_digest(signature, expected_signature)

            if is_valid:
                logger.info('✅ Подпись Tribute webhook проверена успешно')
            else:
                logger.error('❌ Неверная подпись Tribute webhook')

            return is_valid

        except Exception as e:
            logger.error('Ошибка проверки подписи webhook', error=e)
            return False

    async def process_webhook(self, payload_or_data) -> dict[str, Any] | None:
        try:
            logger.info('🔄 Начинаем обработку Tribute webhook')

            if isinstance(payload_or_data, str):
                try:
                    webhook_data = json.loads(payload_or_data)
                    logger.info('📊 Распарсенные данные', webhook_data=webhook_data)
                except json.JSONDecodeError as e:
                    logger.error('❌ Ошибка парсинга JSON', error=e)
                    return None
            else:
                webhook_data = payload_or_data

            payment_id = None
            status = None
            amount_kopeks = 0
            telegram_user_id = None
            trb_user_id = None

            payment_id = webhook_data.get('id') or webhook_data.get('payment_id')
            status = webhook_data.get('status')
            amount_kopeks = webhook_data.get('amount', 0)
            telegram_user_id = webhook_data.get('telegram_user_id')
            trb_user_id = webhook_data.get('trb_user_id')

            if not payment_id and 'payload' in webhook_data:
                data = webhook_data['payload']
                payment_id = data.get('id') or data.get('payment_id')
                status = data.get('status')
                amount_kopeks = data.get('amount', 0)
                telegram_user_id = data.get('telegram_user_id')
                trb_user_id = data.get('trb_user_id')

            if not payment_id and 'name' in webhook_data:
                event_name = webhook_data.get('name')
                data = webhook_data.get('payload', {})
                payment_id = str(data.get('donation_request_id'))
                amount_kopeks = data.get('amount', 0)
                telegram_user_id = data.get('telegram_user_id')
                trb_user_id = data.get('trb_user_id')

                if event_name in ('new_donation', 'recurrent_donation'):
                    status = 'paid'
                elif event_name == 'cancelled_subscription':
                    status = 'cancelled'
                else:
                    status = 'unknown'

            logger.info(
                '📝 Извлеченные данные: payment_id=, status=, amount_kopeks=, telegram_user_id=, trb_user_id=',
                payment_id=payment_id,
                status=status,
                amount_kopeks=amount_kopeks,
                telegram_user_id=telegram_user_id,
                trb_user_id=trb_user_id,
            )

            if not telegram_user_id:
                logger.error(
                    '❌ Не найден telegram_user_id в webhook данных',
                    trb_user_id=trb_user_id,
                )
                logger.error(
                    '🔍 Полные данные для отладки', dumps=json.dumps(webhook_data, ensure_ascii=False, indent=2)
                )
                return None

            try:
                telegram_user_id = int(telegram_user_id)
            except (ValueError, TypeError):
                logger.error('❌ Некорректный telegram_user_id', telegram_user_id=telegram_user_id)
                return None

            result = {
                'event_type': 'payment',
                'payment_id': payment_id or f'tribute_{telegram_user_id}_{amount_kopeks}',
                'user_id': telegram_user_id,
                'trb_user_id': trb_user_id,
                'amount_kopeks': int(amount_kopeks) if amount_kopeks else 0,
                'status': status or 'paid',
                'external_id': f'donation_{payment_id or "unknown"}',
                'payment_system': 'tribute',
            }

            logger.info('✅ Tribute webhook обработан успешно', result=result)
            return result

        except Exception as e:
            logger.error('❌ Ошибка обработки Tribute webhook', error=e, exc_info=True)
            logger.error('🔍 Webhook data для отладки', dumps=json.dumps(webhook_data, ensure_ascii=False, indent=2))
            return None

    async def get_payment_status(self, payment_id: str) -> dict[str, Any] | None:
        try:
            logger.info('Запрос статуса платежа', payment_id=payment_id)
            return {'status': 'unknown', 'payment_id': payment_id}
        except Exception as e:
            logger.error('Ошибка получения статуса платежа', error=e)
            return None

    async def refund_payment(
        self, payment_id: str, amount_kopeks: int | None = None, reason: str = 'Возврат по запросу'
    ) -> dict[str, Any] | None:
        try:
            logger.info('Создание возврата для платежа', payment_id=payment_id)
            return {'refund_id': f'refund_{payment_id}', 'status': 'pending'}
        except Exception as e:
            logger.error('Ошибка создания возврата', error=e)
            return None