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 { PROGRAM_ID } from "../programId"

export interface SignTermsArgs {
  signature: Array<number>
}

export interface SignTermsAccounts {
  owner: PublicKey
  ownerSignatureState: PublicKey
  systemProgram: PublicKey
  rent: PublicKey
}

export const layout = borsh.struct([borsh.array(borsh.u8(), 64, "signature")])

export function signTerms(args: SignTermsArgs, accounts: SignTermsAccounts) {
  const keys: Array<AccountMeta> = [
    { pubkey: accounts.owner, isSigner: true, isWritable: true },
    { pubkey: accounts.ownerSignatureState, isSigner: false, isWritable: true },
    { pubkey: accounts.systemProgram, isSigner: false, isWritable: false },
    { pubkey: accounts.rent, isSigner: false, isWritable: false },
  ]
  const identifier = Buffer.from([226, 42, 174, 143, 144, 159, 139, 1])
  const buffer = Buffer.alloc(1000)
  const len = layout.encode(
    {
      signature: args.signature,
    },
    buffer
  )
  const data = Buffer.concat([identifier, buffer]).slice(0, 8 + len)
  const ix = new TransactionInstruction({ keys, programId: PROGRAM_ID, data })
  return ix
}