from abc import ABC, abstractmethod
from dataclasses import dataclass
from urllib.parse import urlparse
from django.conf import settings
@dataclass(frozen=True, slots=True)
class SMSResult:
    success: bool
    provider_id: str = ""
    error: str = ""
    provider_code: str = ""

@dataclass(frozen=True, slots=True)
class SMSDeliveryResult:
    status: str
    provider_code: str
    description: str
    is_final: bool = True
def webotp_message(code):
    host=settings.WEBOTP_HOST or urlparse(settings.PUBLIC_BASE_URL).hostname
    if not host: raise ValueError("WEBOTP_HOST یا PUBLIC_BASE_URL معتبر تنظیم نشده است.")
    return f"کد شما: {code}\n@{host} #{code}"
class SMSProvider(ABC):
    """Stable application-facing contract for every SMS vendor."""
    def send_otp(self,mobile,code): return self.send_message(mobile,webotp_message(code))
    @abstractmethod
    def send_message(self,mobile,message): raise NotImplementedError

    def get_delivery_status(self, provider_id):
        """Return None when a provider does not support delivery tracking."""
        return None