from enum import Enum
from pydantic import BaseModel, Field
from datetime import datetime
from typing import Optional

class PaymentMethod(str, Enum):
    CASH = "cash"
    CARD = "card"

class PaymentStatus(str, Enum):
    PENDING = "pending"
    PROCESSING = "processing"
    COMPLETED = "completed"
    FAILED = "failed"

class Payment(BaseModel):
    id: Optional[int] = None
    order_id: int
    amount: float = Field(..., gt=0)
    method: PaymentMethod
    status: PaymentStatus = PaymentStatus.PENDING
    transaction_id: Optional[str] = None
    created_at: datetime = Field(default_factory=datetime.utcnow)
    updated_at: Optional[datetime] = None