from typing import Callable, Tuple

from PIL import ImageDraw


RenderFn = Callable[[ImageDraw.ImageDraw, Tuple[int, int], str], None]


class ListItem:
    """A renderable item for use in ListView or CarouselView.

    Each item carries a render function called as render_fn(draw, (x, y), fill).
    An optional render_large_fn is used by CarouselView for a more prominent
    display; it falls back to render_fn when not provided.
    """

    def __init__(self,
                 render_fn: RenderFn,
                 render_large_fn: RenderFn | None = None):
        self._render_fn = render_fn
        self._render_large_fn = render_large_fn

    def render(self,
               draw: ImageDraw.ImageDraw,
               position: Tuple[int, int],
               fill: str = 'black',
               **kwargs):
        """Render the item at normal (list) size.

        Extra keyword arguments (e.g. ``font_size``) are forwarded to the
        underlying render function.
        """
        self._render_fn(draw, position, fill, **kwargs)

    def render_large(self,
                     draw: ImageDraw.ImageDraw,
                     position: Tuple[int, int],
                     fill: str = 'black',
                     **kwargs):
        """Render the item at large (carousel) size.

        Uses render_large_fn if provided, otherwise falls back to render_fn.
        Extra keyword arguments (e.g. ``font_size``) are forwarded to the
        underlying render function.
        """
        fn = self._render_large_fn or self._render_fn
        fn(draw, position, fill, **kwargs)