import { 
  Transaction, 
  ComputeBudgetProgram, 
  PublicKey 
} from '@solana/web3.js';
import { createTransferCheckedInstruction } from '@solana/spl-token';

// 1. Get Mint Address
// Format: "solana:mainnet/spl-token:EPj..."
const mint = new PublicKey(accept.asset.split(':').pop());

// 2. Build Transaction
const tx = new Transaction();

// IX 1: Compute Limit (Required)
tx.add(ComputeBudgetProgram.setComputeUnitLimit({ units: 200_000 }));

// IX 2: Priority Fee (Required)
tx.add(ComputeBudgetProgram.setComputeUnitPrice({ microLamports: 1000 }));

// IX 3: SPL Transfer (Required)
tx.add(createTransferCheckedInstruction(
    sourceAta,      // Agent's ATA
    mint,           // USDC Mint
    destAta,        // Destination ATA (derive from accept.payTo)
    agentPubkey,    // Owner
    BigInt(accept.maxAmountRequired),
    6               // Decimals (USDC = 6)
));

// 3. Serialize
// Must require all signatures to be falsy since we haven't signed yet if using partial sign, 
// or sign first then serialize. Use { requireAllSignatures: false } if simulating.
tx.recentBlockhash = (await connection.getLatestBlockhash()).blockhash;
tx.sign(agentKeypair);

const serialized = tx.serialize().toString('base64');