from decimal import Decimal
from uuid import UUID, uuid4

from pydantic import BaseModel, Field, field_validator


class Transaction(BaseModel):
    id: UUID = Field(default_factory=uuid4)
    date: str = ""
    account: str = ""
    category: str = ""
    amount: Decimal = Field(default=Decimal("0"))
    description: str = ""

    @field_validator("amount")
    @classmethod
    def _amount_nonzero(cls, v: Decimal) -> Decimal:
        if v == 0:
            raise ValueError("amount must be non-zero")
        return v