from typing import Generic, TypeVar, Optional, List
from pydantic import BaseModel, Field

T = TypeVar("T")


class ResponseModel(BaseModel, Generic[T]):
    code: int = 200
    message: str = "success"
    data: Optional[T] = None


class ListResponse(BaseModel, Generic[T]):
    code: int = 200
    message: str = "success"
    data: List[T] = []
    total: int = 0
    page: int = 1
    page_size: int = 20


class PageParams(BaseModel):
    page: int = Field(1, ge=1)
    page_size: int = Field(20, ge=1, le=500)
    keyword: Optional[str] = None