import logging
import zeep
from django.conf import settings
from zeep.helpers import serialize_object
from .base import SMSProvider, SMSResult

logger = logging.getLogger(__name__)

class BehinSMSProvider(SMSProvider):
    """SOAP adapter for panel.behinsms.com, isolated from application code."""

    def __init__(self):
        self.username = settings.BEHIN_SMS_USERNAME
        self.password = settings.BEHIN_SMS_PASSWORD
        self.special_number = settings.BEHIN_SMS_SPECIAL_NUMBER
        self.wsdl_url = settings.BEHIN_SMS_WSDL_URL
        self._client = None

    def _configuration_error(self):
        missing = [name for name, value in (
            ("BEHIN_SMS_USERNAME", self.username),
            ("BEHIN_SMS_PASSWORD", self.password),
            ("BEHIN_SMS_SPECIAL_NUMBER", self.special_number)
        ) if not value]
        return f"تنظیمات پیامک بهین ناقص است: {', '.join(missing)}" if missing else ""

    @property
    def client(self):
        if self._client is None:
            # استفاده از تنظیمات پیش‌فرض Zeep (مشابه نمونهٔ کاری)
            self._client = zeep.Client(wsdl=self.wsdl_url)
        return self._client

    def get_credit(self):
        error = self._configuration_error()
        if error:
            raise ValueError(error)
        return self.client.service.GetCredit(UserName=self.username, Password=self.password)

    def send_message(self, mobile, message):
        return self.send_many([mobile], message)

    def send_many(self, mobile_numbers, message, is_flash=False):
        error = self._configuration_error()
        if error:
            return SMSResult(False, error=error)

        recipients = list(dict.fromkeys(str(number).strip() for number in mobile_numbers if str(number).strip()))
        if not recipients:
            return SMSResult(False, error="شماره گیرنده پیامک خالی است.")

        try:
            response = self.client.service.SendArray(
                UserName=self.username,
                Password=self.password,
                RecipientNumber={"string": recipients},
                MessageBody=message,
                SpecialNumber=self.special_number,
                IsFlashMessage=is_flash,
                CheckingMessageID={"long": [0] * len(recipients)}
            )
            serialized = serialize_object(response)
            if serialized is False or serialized is None:
                return SMSResult(False, error="وب‌سرویس بهین ارسال پیامک را تأیید نکرد.")
            return SMSResult(True, provider_id=str(serialized)[:500])

        except Exception as exc:
            logger.exception("Behin SMS delivery failed")
            return SMSResult(False, error=str(exc)[:1000])