# src/vote-account.js

    // @flow
    import * as BufferLayout from 'buffer-layout';

    import * as Layout from './layout';
    import {PublicKey} from './publickey';

    export const VOTE_ACCOUNT_KEY = new PublicKey(
      'Vote111111111111111111111111111111111111111',
    );

    export type Lockout = {|
      slot: number,
      confirmationCount: number,
    |};

    /**
     * History of how many credits earned by the end of each epoch
     */
    export type EpochCredits = {|
      epoch: number,
      credits: number,
      prevCredits: number,
    |};

    /**
     * See https://github.com/solana-labs/solana/blob/8a12ed029cfa38d4a45400916c2463fb82bbec8c/programs/vote_api/src/vote_state.rs#L68-L88
     *
     * @private
     */
    const VoteAccountLayout = BufferLayout.struct([
      Layout.publicKey('nodePubkey'),
      Layout.publicKey('authorizedVoterPubkey'),
      Layout.publicKey('authorizedWithdrawerPubkey'),
      BufferLayout.u8('commission'),
      BufferLayout.nu64(), // votes.length
      BufferLayout.seq(
        BufferLayout.struct([
          BufferLayout.nu64('slot'),
          BufferLayout.u32('confirmationCount'),
        ]),
        BufferLayout.offset(BufferLayout.u32(), -8),
        'votes',
      ),
      BufferLayout.u8('rootSlotValid'),
      BufferLayout.nu64('rootSlot'),
      BufferLayout.nu64('epoch'),
      BufferLayout.nu64('credits'),
      BufferLayout.nu64('lastEpochCredits'),
      BufferLayout.nu64(), // epochCredits.length
      BufferLayout.seq(
        BufferLayout.struct([
          BufferLayout.nu64('epoch'),
          BufferLayout.nu64('credits'),
          BufferLayout.nu64('prevCredits'),
        ]),
        BufferLayout.offset(BufferLayout.u32(), -8),
        'epochCredits',
      ),
    ]);

    /**
     * VoteAccount class
     */
    export class VoteAccount {
      nodePubkey: PublicKey;
      authorizedVoterPubkey: PublicKey;
      authorizedWithdrawerPubkey: PublicKey;
      commission: number;
      votes: Array<Lockout>;
      rootSlot: number | null;
      epoch: number;
      credits: number;
      lastEpochCredits: number;
      epochCredits: Array<EpochCredits>;

      /**
       * Deserialize VoteAccount from the account data.
       *
       * @param buffer account data
       * @return VoteAccount
       */
      static fromAccountData(buffer: Buffer): VoteAccount {
        const va = VoteAccountLayout.decode(buffer, 0);
        va.nodePubkey = new PublicKey(va.nodePubkey);
        va.authorizedVoterPubkey = new PublicKey(va.authorizedVoterPubkey);
        va.authorizedWithdrawerPubkey = new PublicKey(
          va.authorizedWithdrawerPubkey,
        );
        if (!va.rootSlotValid) {
          va.rootSlot = null;
        }
        return va;
      }
    }