export type ObjectKey = string | symbol | number;
export type ObjectPath = Array<ObjectKey>;
export type ObjectPathLike = ObjectKey | ObjectPath;

/**
 * Parse object path
 *
 * @example
 * parseObjectPath('a.b.c') // => ['a', 'b', 'c']
 * parseObjectPath('a[0].b') // => ['a', 0, 'b']
 * parseObjectPath('a[0][1]') // => ['a', 0, 1]
 *
 */
export function parseObjectPath(s: ObjectPathLike): ObjectPath {
	if (typeof s !== 'string') {
		return Array.isArray(s) ? s : [s];
	}
	const parts = s.split('.');
	// fast path
	if (!s.includes('[')) {
		return parts;
	}

	const result: Array<string | number> = [];
	for (const part of parts) {
		if (!part.endsWith(']')) {
			result.push(part);
		} else {
			// a[0][1]
			// try parseInt can extend to support a[-1] to use .at access
			const s = part.split('[');
			for (let sub of s) {
				if (sub.endsWith(']')) {
					sub = sub.slice(0, -1);
				}
				result.push(sub);
			}
		}
	}
	return result;
}