import os
from dataclasses import dataclass
from typing import Optional


@dataclass
class PaymentInitResult:
    external_id: str
    redirect_url: Optional[str]


class BasePaymentGateway:
    def create_payment(self, amount: str, currency: str, description: str) -> PaymentInitResult:
        raise NotImplementedError

    def capture_payment(self, external_id: str) -> None:
        raise NotImplementedError

    def refund_payment(self, external_id: str, amount: Optional[str] = None) -> None:
        raise NotImplementedError


class MoyasarGateway(BasePaymentGateway):
    def __init__(self) -> None:
        self.secret_key = os.getenv("MOYASAR_SECRET_KEY")
        self.publishable_key = os.getenv("MOYASAR_PUBLISHABLE_KEY")
        self.base_url = os.getenv("MOYASAR_BASE_URL", "https://api.moyasar.com")

    def _assert_config(self) -> None:
        if not self.secret_key or not self.publishable_key:
            raise ValueError("Moyasar credentials are not configured")

    def create_payment(self, amount: str, currency: str, description: str) -> PaymentInitResult:
        self._assert_config()
        raise NotImplementedError("Moyasar gateway integration not implemented yet")

    def capture_payment(self, external_id: str) -> None:
        self._assert_config()
        raise NotImplementedError("Moyasar capture not implemented yet")

    def refund_payment(self, external_id: str, amount: Optional[str] = None) -> None:
        self._assert_config()
        raise NotImplementedError("Moyasar refund not implemented yet")