import { dynamic } from "@solidjs/web";
import { createRenderEffect, omit, onCleanup, Show } from "solid-js";
import { composeRefs, userRef } from "../../internals/compose-refs.jsx";
import { mergeRootProps } from "../../internals/merge-root-props.jsx";
import { resolveClassStyle } from "../../internals/resolve-class-style.jsx";
import { useScrollAreaRootContext } from "../root/scroll-area-root-context.jsx";

// biome-ignore lint/complexity/noBannedTypes: matches Base UI React — corner exposes no state fields, but a named type lets consumers reference `ScrollArea.Corner.State`.

/**
 * Small square sitting at the intersection of the two scrollbars. Renders
 * a `<div>` element (or `as` override), or nothing when both scrollbars are
 * visible is false.
 *
 * §1 wave 3: replaces `renderElement` with `dynamic(() => props.as ?? "div")`.
 */
export function ScrollAreaCorner(props) {
  const context = useScrollAreaRootContext();
  const userStyling = resolveClassStyle(props, () => ({}));
  const userProps = omit(props, "class", "style", "attrs", "as");
  const localRef = el => {
    context.cornerRef.current = el;
  };

  // `<Show>` swaps its children by unmounting the old branch without firing
  // the ref callback with `null`, so the shared `cornerRef.current` would
  // dangle at a detached node. Ref callbacks run ownerless in Solid 2
  // (`onCleanup` there is a no-op — `[NO_OWNER_CLEANUP]`), so the cleanup
  // lives in owned scopes instead: a render effect mirroring the `<Show>`
  // condition handles branch swaps, and onCleanup handles disposal.
  createRenderEffect(() => context.hiddenState().corner, hidden => {
    if (hidden) {
      context.cornerRef.current = null;
    }
    return undefined;
  });
  onCleanup(() => {
    context.cornerRef.current = null;
  });
  const internalSlot = {
    get style() {
      const size = context.cornerSize();
      return {
        position: "absolute",
        bottom: 0,
        "inset-inline-end": 0,
        width: `${size.width}px`,
        height: `${size.height}px`
      };
    }
  };
  const styledUserProps = mergeRootProps(userStyling, userProps);
  const merged = mergeRootProps(internalSlot, styledUserProps);
  const Tag = dynamic(() => props.as ?? "div");
  return <Show when={!context.hiddenState().corner}>
			<Tag {...merged} ref={composeRefs(localRef, userRef(props))} />
		</Show>;
}
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