import { ValidationError } from '../../errors'
import { SignerEntry } from '../common'

import { BaseTransaction, validateBaseTransaction } from './common'

/**
 * The SignerListSet transaction creates, replaces, or removes a list of
 * signers that can be used to multi-sign a transaction.
 *
 * @category Transaction Models
 */
export interface SignerListSet extends BaseTransaction {
  TransactionType: 'SignerListSet'
  /**
   * A target number for the signer weights. A multi-signature from this list
   * is valid only if the sum weights of the signatures provided is greater than
   * or equal to this value. To delete a signer list, use the value 0.
   */
  SignerQuorum: number
  /**
   * Array of SignerEntry objects, indicating the addresses and weights of
   * signers in this list. This signer list must have at least 1 member and no
   * more than 8 members. No address may appear more than once in the list, nor
   * may the Account submitting the transaction appear in the list.
   */
  SignerEntries: SignerEntry[]
}

const MAX_SIGNERS = 8

/**
 * Verify the form and type of an SignerListSet at runtime.
 *
 * @param tx - An SignerListSet Transaction.
 * @throws When the SignerListSet is Malformed.
 */
export function validateSignerListSet(tx: Record<string, unknown>): void {
  validateBaseTransaction(tx)

  if (tx.SignerQuorum === undefined) {
    throw new ValidationError('SignerListSet: missing field SignerQuorum')
  }

  if (typeof tx.SignerQuorum !== 'number') {
    throw new ValidationError('SignerListSet: invalid SignerQuorum')
  }

  if (tx.SignerEntries === undefined) {
    throw new ValidationError('SignerListSet: missing field SignerEntries')
  }

  if (!Array.isArray(tx.SignerEntries)) {
    throw new ValidationError('SignerListSet: invalid SignerEntries')
  }

  if (tx.SignerEntries.length === 0) {
    throw new ValidationError(
      'SignerListSet: need atleast 1 member in SignerEntries',
    )
  }

  if (tx.SignerEntries.length > MAX_SIGNERS) {
    throw new ValidationError(
      'SignerListSet: maximum of 8 members allowed in SignerEntries',
    )
  }
}