/**
 * BILLmanager 6 API HTTP client
 * @see https://www.ispsystem.com/docs/b6c/developer-section/working-with-api/guide-to-ispsystem-software-api
 */

/**
 * @param {string} baseUrl - e.g. https://bill.example.com:1500/billmgr
 * @param {string} authinfo - username:password
 * @param {string} func - API function name (vds, payment, dedic)
 * @param {Record<string, string>} [params] - additional query params
 * @returns {Promise<any>}
 */
export async function billmanagerRequest(baseUrl, authinfo, func, params = {}) {
  const url = new URL(baseUrl)
  url.searchParams.set('authinfo', authinfo)
  url.searchParams.set('out', 'bjson')
  url.searchParams.set('func', func)
  for (const [k, v] of Object.entries(params)) {
    if (v != null && v !== '') url.searchParams.set(k, String(v))
  }
  const res = await fetch(url.toString(), { method: 'GET' })
  if (!res.ok) {
    throw new Error(`BILLmanager API HTTP ${res.status}: ${res.statusText}`)
  }
  const data = await res.json()
  if (data.error) {
    throw new Error(data.error.msg || data.error.$t || 'BILLmanager API error')
  }
  return data
}