import { toHex } from '../../../core/internal/encoding/toHex.js'
import type { ErrorType } from '../../../core/internal/errors/utils.js'
import { toSignatureArray } from '../../../core/internal/transaction/serializeTransaction.js'
import type {
  BigIntegerish,
  Integerish,
} from '../../../core/internal/types/data.js'
import type {
  SerializedAuthorizationList,
  SignedAuthorizationList,
} from '../types/authorization.js'

export type SerializeAuthorizationListReturnType = SerializedAuthorizationList

export type SerializeAuthorizationListErrorType = ErrorType

/*
 * Serializes an EIP-7702 authorization list.
 */
export function serializeAuthorizationList(
  authorizationList?:
    | SignedAuthorizationList<BigIntegerish, Integerish>
    | undefined,
): SerializeAuthorizationListReturnType {
  if (!authorizationList || authorizationList.length === 0) return []

  const serializedAuthorizationList = []
  for (const authorization of authorizationList) {
    const { contractAddress, chainId, nonce, ...signature } = authorization
    serializedAuthorizationList.push([
      toHex(chainId),
      contractAddress,
      [nonce ? toHex(nonce) : '0x'],
      ...toSignatureArray(signature),
    ])
  }

  return serializedAuthorizationList as {} as SerializeAuthorizationListReturnType
}