from typing import Optional
from pydantic import BaseModel, Field


class PresetConfig(BaseModel):
    id: str
    technique: str
    shot_count: Optional[int] = 1


class PaginationMeta(BaseModel):
    total: int = Field(
        ...,
        description="Total number of items in the collection.",
        example=125
    )
    skip: int = Field(
        ...,
        description="Number of items skipped (used for pagination offset).",
        example=20
    )
    limit: int = Field(
        ...,
        description="Maximum number of items returned per page.",
        example=10
    )
    has_next: bool = Field(
        ...,
        description="Whether there are more items after the current page.",
        example=True
    )
    has_previous: bool = Field(
        ...,
        description="Whether there are items before the current page.",
        example=True
    )
    next_skip: Optional[int] = Field(
        None,
        description="Skip value to use for fetching the next page, if it exists.",
        example=30
    )
    previous_skip: Optional[int] = Field(
        None,
        description="Skip value to use for fetching the previous page, if it exists.",
        example=10
    )