"""Common Pydantic schemas used across the application."""

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


DataT = TypeVar('DataT')


class PaginatedResponse(BaseModel, Generic[DataT]):
    """Generic paginated response schema."""

    items: List[DataT]
    total: int
    page: int
    limit: int
    pages: int


class MessageResponse(BaseModel):
    """Simple message response schema."""

    message: str
    detail: Optional[str] = None


class ErrorResponse(BaseModel):
    """Error response schema."""

    error: str
    detail: Optional[str] = None
    status_code: int


class TokenResponse(BaseModel):
    """JWT token response schema."""

    access_token: str
    token_type: str = "bearer"
    expires_in: int  # seconds