from abc import ABC, abstractmethod
import requests
import logging
from django.conf import settings

logger = logging.getLogger(__name__)


class SmsProviderABC(ABC):
    @abstractmethod
    def send_sms(self, mobile: str, message: str) -> bool | None:
        pass


class DefaultSmsProvider(SmsProviderABC):
    def send_sms(self, mobile: str, message: str) -> bool | None:
        default_provider = DosefrNavadHashtSMS()
        return default_provider.send_sms(mobile, message)


class DosefrNavadHashtSMS(SmsProviderABC):
    def send_sms(self, mobile: str, message: str) -> bool | None:
        payload = {
            'USERNAME': 'vsms7937',
            'PASSWORD': '335577775533',
            'FROM': '30005367',
            'TO': int(mobile),
            'TEXT': f'{message}'
        }
        try:
            r = requests.get('http://www.0098sms.com/sendsmslink.aspx', params=payload, timeout=10)
            r.raise_for_status()
        except (requests.Timeout, requests.ConnectionError):
            # The provider may have dispatched the SMS before its reply was lost.
            logger.warning('SMS provider reply unavailable; dispatch is unconfirmed')
            return None
        except requests.HTTPError as error:
            if error.response is not None and error.response.status_code >= 500:
                logger.warning('SMS provider server error; dispatch is unconfirmed')
                return None
            return False
        except requests.RequestException:
            return False
        # Unknown bodies are NOT evidence of rejection. In particular, never
        # discard a delivered OTP just because the response contract differs.
        success_codes = getattr(settings, 'SMS_SUCCESS_CODES', ('0',))
        failure_codes = getattr(settings, 'SMS_FAILURE_CODES', ('error',))
        body = r.text.strip().lstrip('\ufeff').strip()
        def codes(values):
            if isinstance(values, str):
                values = values.split(',')
            return {str(value).strip() for value in values}
        if body in codes(success_codes):
            return True
        if body in codes(failure_codes):
            return False
        # Do not log the reply, URL, credentials, mobile, or OTP.
        logger.warning('SMS provider returned an unrecognized reply; dispatch is unconfirmed')
        return None