/**
 * Stringification helpers for combobox item values. Subset of Base UI
 * React's `packages/react/src/internals/resolveValueLabel.tsx` — only the
 * string-returning helpers are ported (the JSX-returning
 * `resolveMultipleLabels` / `resolveSelectedLabel` are not needed for the
 * Solid single-select port).
 */

export interface Group<Item = unknown> {
	[key: string]: unknown;
	items: ReadonlyArray<Item>;
}

export function isGroupedItems(
	items: ReadonlyArray<unknown> | undefined,
): items is ReadonlyArray<Group<unknown>> {
	return (
		items != null &&
		items.length > 0 &&
		typeof items[0] === "object" &&
		items[0] != null &&
		"items" in (items[0] as object)
	);
}

function serializeValue(value: unknown): string {
	if (value == null) return "";
	if (typeof value === "string") return value;
	return String(value);
}

export function stringifyAsLabel(
	item: unknown,
	itemToStringLabel?: (item: unknown) => string,
): string {
	if (itemToStringLabel && item != null) {
		return itemToStringLabel(item) ?? "";
	}
	if (item && typeof item === "object") {
		const obj = item as Record<string, unknown>;
		if ("label" in obj && obj.label != null) {
			return String(obj.label);
		}
		if ("value" in obj) {
			return String(obj.value);
		}
	}
	return serializeValue(item);
}

export function stringifyAsValue(
	item: unknown,
	itemToStringValue?: (item: unknown) => string,
): string {
	if (itemToStringValue && item != null) {
		return itemToStringValue(item) ?? "";
	}
	if (
		item &&
		typeof item === "object" &&
		"value" in (item as object) &&
		"label" in (item as object)
	) {
		return serializeValue((item as { value: unknown }).value);
	}
	return serializeValue(item);
}