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

T = TypeVar("T")


class SuccessResponse(BaseModel, Generic[T]):
    success: bool = True
    message: Optional[str] = None
    data: Optional[T] = None


class ErrorResponse(BaseModel):
    success: bool = False
    message: str
    errors: List[Any] = []


class PaginatedResponse(BaseModel, Generic[T]):
    success: bool = True
    message: Optional[str] = None
    data: List[T] = []
    total: int = 0
    page: int = 1
    page_size: int = 20
    pages: int = 0


def success(data: Any = None, message: str = None) -> dict:
    return {"success": True, "message": message, "data": data}


def paginated(items: list, total: int, page: int, page_size: int) -> dict:
    pages = (total + page_size - 1) // page_size if page_size > 0 else 0
    return {
        "success": True,
        "data": items,
        "total": total,
        "page": page,
        "page_size": page_size,
        "pages": pages,
    }