package org.stellar.sdk;

import static java.nio.charset.StandardCharsets.UTF_8;

import java.util.Collections;
import org.stellar.sdk.operations.ManageDataOperation;
import org.stellar.sdk.responses.TransactionResponse;

public class Demo {
  public static void main(String[] args) {
    try (Server server = new Server("https://horizon-testnet.stellar.org")) {
      KeyPair masterKp =
          KeyPair.fromSecretSeed("SCZV7YTZVJY5GMUHBGSP6AHJMBHUH6SLANWIFQ7JUN6BYGK4YOLP3DIW");
      KeyPair extraSigner =
          KeyPair.fromSecretSeed("SBGQBSZDLS6QP23CC6CQXTRIIUOBSI6T6X6LHLRVUC7GDQMEIRPHG32H");
      TransactionBuilderAccount source = server.loadAccount(masterKp.getAccountId());

      TransactionPreconditions preconditions =
          TransactionPreconditions.builder()
              .extraSigners(
                  Collections.singletonList(
                      SignerKey.fromEd25519SignedPayload(
                          extraSigner.getAccountId(), "Hello, World!".getBytes(UTF_8))))
              .build();
      Transaction tx =
          new TransactionBuilder(source, Network.TESTNET)
              .setBaseFee(100)
              .setTimeout(300)
              .addPreconditions(preconditions)
              .addOperation(
                  ManageDataOperation.builder()
                      .name("hello")
                      .value("world".getBytes(UTF_8))
                      .build())
              .build();

      tx.sign(masterKp);
      tx.signExtraSignersPayload(extraSigner); // Sign the extra signers payload
      try {
        TransactionResponse response = server.submitTransaction(tx);
        System.out.println("Transaction successful: " + response.getHash());
      } catch (Exception e) {
        System.err.println("Transaction failed: " + e.getMessage());
      }
    }
  }
}