// SPDX-License-Identifier: MIT

import { validate as validateUuid } from "uuid";
import { getConfig } from "@slawek/sk-tools";

type Config = {
  tenantId: string;
  clientId: string;
};

export async function loadConfig(configName: string): Promise<Config> {
  if (typeof configName !== "string" || configName.trim() === "") {
    throw new Error(
      'Invalid config name. Expected a non-empty string like "public-config" or "confidential-config".',
    );
  }

  const envConfig = {
    tenantId: process.env.AZURE_TENANT_ID,
    clientId: process.env.AZURE_CLIENT_ID,
  };

  const json = (await getConfig("sk-az-tools", configName)) as Record<string, unknown>;

  const tenantId = (typeof json.tenantId === "string" && json.tenantId ? json.tenantId : envConfig.tenantId) ?? "";
  const clientId = (typeof json.clientId === "string" && json.clientId ? json.clientId : envConfig.clientId) ?? "";

  if (!validateUuid(tenantId ?? "") || !validateUuid(clientId ?? "")) {
    throw new Error("tenantId and clientId must be valid GUIDs.");
  }

  return {
    tenantId,
    clientId,
  };
}