export type ChannelEntryMatch<T> = {
  entry?: T;
  key?: string;
  wildcardEntry?: T;
  wildcardKey?: string;
};

export function buildChannelKeyCandidates(
  ...keys: Array<string | undefined | null>
): string[] {
  const seen = new Set<string>();
  const candidates: string[] = [];
  for (const key of keys) {
    if (typeof key !== "string") continue;
    const trimmed = key.trim();
    if (!trimmed || seen.has(trimmed)) continue;
    seen.add(trimmed);
    candidates.push(trimmed);
  }
  return candidates;
}

export function resolveChannelEntryMatch<T>(params: {
  entries?: Record<string, T>;
  keys: string[];
  wildcardKey?: string;
}): ChannelEntryMatch<T> {
  const entries = params.entries ?? {};
  const match: ChannelEntryMatch<T> = {};
  for (const key of params.keys) {
    if (!Object.prototype.hasOwnProperty.call(entries, key)) continue;
    match.entry = entries[key];
    match.key = key;
    break;
  }
  if (params.wildcardKey && Object.prototype.hasOwnProperty.call(entries, params.wildcardKey)) {
    match.wildcardEntry = entries[params.wildcardKey];
    match.wildcardKey = params.wildcardKey;
  }
  return match;
}