Deposit Collateral

import {
    Connection,
    Keypair,
    TransactionMessage,
    VersionedTransaction,
} from "@solana/web3.js";
import BN from "bn.js";
import { getOperateIx } from "@jup-ag/lend/borrow";
import fs from "fs";
import path from "path";

const KEYPAIR_PATH = "/path/to/your/keypair.json"; // Path to your local keypair file (update this path)
const RPC_URL = "https://api.mainnet-beta.solana.com"; // RPC endpoint
const VAULT_ID = 1; // Target vault (market)
const POSITION_ID = 0; // 0 = create + deposit in one tx; or nftId from existing position
const DEPOSIT_AMOUNT = new BN(1_000_000); // Collateral to deposit, in smallest units (supply token base units)

function loadKeypair(keypairPath: string): Keypair {
    const fullPath = path.resolve(keypairPath);
    const secret = JSON.parse(fs.readFileSync(fullPath, "utf8"));
    return Keypair.fromSecretKey(new Uint8Array(secret));
}

// 1. Load user keypair and establish connection
const userKeypair = loadKeypair(KEYPAIR_PATH);
const connection = new Connection(RPC_URL, { commitment: "confirmed" });
const signer = userKeypair.publicKey;

// 2. Get deposit instructions from SDK (operate with positive colAmount, zero debtAmount)
// Pass positionId: 0 to batch init position + deposit in one transaction
const { ixs, addressLookupTableAccounts, nftId } = await getOperateIx({
    vaultId: VAULT_ID,
    positionId: POSITION_ID,
    colAmount: DEPOSIT_AMOUNT,
    debtAmount: new BN(0),
    connection,
    signer,
});

if (!ixs?.length) {
    throw new Error("No deposit instructions returned by Jupiter Lend SDK.");
}

// 3. Build the transaction with latest blockhash and add deposit instructions
// Versioned (v0) transaction with address lookup tables; ready to be signed and sent
const latestBlockhash = await connection.getLatestBlockhash();
const message = new TransactionMessage({
    payerKey: signer,
    recentBlockhash: latestBlockhash.blockhash,
    instructions: ixs,
}).compileToV0Message(addressLookupTableAccounts ?? []);

const transaction = new VersionedTransaction(message);
transaction.sign([userKeypair]);

// 4. Send and confirm the transaction
const signature = await connection.sendTransaction(transaction, {
    skipPreflight: false,
    maxRetries: 3,
    preflightCommitment: "confirmed",
});
await connection.confirmTransaction(
    { signature, ...latestBlockhash },
    "confirmed"
);

console.log("Deposit successful! Signature:", signature);