// SPDX-FileCopyrightText: © 2026 LEDGER SAS
// SPDX-License-Identifier: Apache-2.0

import type { StellarCoinConfig } from '../config'
import { StrKey } from '@stellar/stellar-sdk'
import { NULL_ACCOUNT } from '@stellar/stellar-sdk/contract'
import { fetchSigners } from '../network'

export async function isAccountMultiSign(
  config: StellarCoinConfig,
  account: string
): Promise<boolean> {
  const signers = await fetchSigners(config, account)
  return signers.length > 1
}

/**
 * Returns true if address is valid, false if it's invalid (can't parse or wrong checksum)
 *
 * @param {*} address
 */
export function isAddressValid(address: string): boolean {
  if (!address || address === NULL_ACCOUNT) return false

  try {
    return StrKey.isValidEd25519PublicKey(address) || StrKey.isValidMed25519PublicKey(address)
  } catch {
    return false
  }
}

/** Compile-time exhaustiveness helper: call when a value should be `never`. */
export function assertUnreachable(_: never): never {
  throw new Error('unreachable assertion failed')
}