import { type Accessor, createContext, useContext } from "solid-js";
import type { AutocompleteMode } from "./autocomplete-root";

/**
 * Autocomplete-specific context layered on top of the combobox root
 * context. Carries bits that combobox doesn't know about — currently
 * just the `mode`, which drives `aria-autocomplete` on the input and
 * the `data-*` attributes on the input-group.
 *
 * The bulk of shared state (open, inputValue, indices, refs, etc.)
 * still flows through `ComboboxRootContext` so that every
 * combobox-provided sub-part (Portal, Positioner, Popup, List, etc.)
 * works against an autocomplete root without rewiring.
 */
export interface AutocompleteRootContextValue {
	mode: Accessor<AutocompleteMode>;
}

export const AutocompleteRootContext =
	createContext<AutocompleteRootContextValue | null>(null);

export function useAutocompleteRootContext(): AutocompleteRootContextValue;
export function useAutocompleteRootContext(
	optional: true,
): AutocompleteRootContextValue | null;
export function useAutocompleteRootContext(
	optional?: boolean,
): AutocompleteRootContextValue | null {
	const ctx = useContext(AutocompleteRootContext);
	if (ctx == null && !optional) {
		throw new Error(
			"Base UI: AutocompleteRootContext is missing. Autocomplete parts must be placed within <Autocomplete.Root>.",
		);
	}
	return ctx;
}