import type { JSX, ValidComponent } from "@solidjs/web";
import { dynamic } from "@solidjs/web";
import { createMemo, omit } from "solid-js";
import { composeRefs, userRef } from "../../internals/compose-refs";
import { mergeRootProps } from "../../internals/merge-root-props";
import { resolveClassStyle } from "../../internals/resolve-class-style";
import type { BaseUIComponentProps } from "../../internals/types";
import { useSelectRootContext } from "../select-root-context";

export interface SelectIconState {
	open: boolean;
}

export interface SelectIconProps
	extends BaseUIComponentProps<"span", SelectIconState> {
	as?: ValidComponent;
}

/**
 * `<Select.Icon>` — a decorative `<span>` that indicates the trigger opens a
 * select popup.
 */
export function SelectIcon(props: SelectIconProps): JSX.Element {
	const root = useSelectRootContext();

	const state = createMemo<SelectIconState>(() => ({ open: root.open() }));

	const internal = {
		"aria-hidden": "true" as const,
		children: "▼" as JSX.Element,
		// triggerOpenStateMapping: open → data-popup-open.
		get "data-popup-open"() {
			return state().open ? "" : undefined;
		},
	};

	const userClassStyle = resolveClassStyle(props, () => state());
	const userProps = omit(props, "as", "class", "style", "attrs");

	let merged: Record<string, unknown> = mergeRootProps(
		internal,
		userClassStyle,
	);
	merged = mergeRootProps(merged, userProps);

	const Tag = dynamic(() => props.as ?? "span");
	return <Tag {...merged} ref={composeRefs(userRef(props))} />;
}