import { TransactionInstruction, PublicKey, AccountMeta } from '@solana/web3.js'; // eslint-disable-line @typescript-eslint/no-unused-vars
import BN from 'bn.js'; // eslint-disable-line @typescript-eslint/no-unused-vars
import * as borsh from '@project-serum/borsh'; // eslint-disable-line @typescript-eslint/no-unused-vars
import * as types from '../types'; // eslint-disable-line @typescript-eslint/no-unused-vars
import { WHIRLPOOL_PROGRAM_ID } from '../programId';

export interface InitializeRewardArgs {
  rewardIndex: number;
}

export interface InitializeRewardAccounts {
  rewardAuthority: PublicKey;
  funder: PublicKey;
  whirlpool: PublicKey;
  rewardMint: PublicKey;
  rewardVault: PublicKey;
  tokenProgram: PublicKey;
  systemProgram: PublicKey;
  rent: PublicKey;
}

export const layout = borsh.struct([borsh.u8('rewardIndex')]);

export function initializeReward(args: InitializeRewardArgs, accounts: InitializeRewardAccounts) {
  const keys: Array<AccountMeta> = [
    { pubkey: accounts.rewardAuthority, isSigner: true, isWritable: false },
    { pubkey: accounts.funder, isSigner: true, isWritable: true },
    { pubkey: accounts.whirlpool, isSigner: false, isWritable: true },
    { pubkey: accounts.rewardMint, isSigner: false, isWritable: false },
    { pubkey: accounts.rewardVault, isSigner: true, isWritable: true },
    { pubkey: accounts.tokenProgram, isSigner: false, isWritable: false },
    { pubkey: accounts.systemProgram, isSigner: false, isWritable: false },
    { pubkey: accounts.rent, isSigner: false, isWritable: false },
  ];
  const identifier = Buffer.from([95, 135, 192, 196, 242, 129, 230, 68]);
  const buffer = Buffer.alloc(1000);
  const len = layout.encode(
    {
      rewardIndex: args.rewardIndex,
    },
    buffer
  );
  const data = Buffer.concat([identifier, buffer]).slice(0, 8 + len);
  const ix = new TransactionInstruction({ keys, programId: WHIRLPOOL_PROGRAM_ID, data });
  return ix;
}