type UnknownRecord = Record<string, unknown>;

function readString(value: unknown): string | undefined {
  if (typeof value !== "string") return undefined;
  return value;
}

function normalizeChannel(value: string): string {
  return value.trim().toLowerCase();
}

export function migrateLegacyCronPayload(payload: UnknownRecord): boolean {
  let mutated = false;

  const channelValue = readString(payload.channel);
  const providerValue = readString(payload.provider);

  const nextChannel =
    typeof channelValue === "string" && channelValue.trim().length > 0
      ? normalizeChannel(channelValue)
      : typeof providerValue === "string" && providerValue.trim().length > 0
        ? normalizeChannel(providerValue)
        : "";

  if (nextChannel) {
    if (channelValue !== nextChannel) {
      payload.channel = nextChannel;
      mutated = true;
    }
  }

  if ("provider" in payload) {
    delete payload.provider;
    mutated = true;
  }

  return mutated;
}