from typing import List, Optional, Union
from datetime import date
from pydantic import BaseModel, Field, ConfigDict


class TransactionBase(BaseModel):
    amount: float = Field(..., gt=-1e18, lt=1e18)
    description: Optional[str] = None
    # accept either ISO date string or date object
    date: Optional[Union[date, str]] = None

class TransactionCreate(TransactionBase):
    category_ids: Optional[List[int]] = None

class TransactionUpdate(BaseModel):
    amount: Optional[float] = Field(None, gt=-1e18, lt=1e18)
    description: Optional[str] = None
    # accept either ISO date string or date object
    date: Optional[Union[date, str]] = None
    category_ids: Optional[List[int]] = None

class TransactionRead(TransactionBase):
    id: int
    category_ids: List[int] = []
    date: Optional[Union[date, str]]
    model_config = ConfigDict(from_attributes=True)