Buying Shares

import { BN } from "@coral-xyz/anchor";
import { Transaction } from "@solana/web3.js";

const amount = new BN(100_000_000); // 100 USDC (6 decimals)
const outcomeIndex = 0; // First outcome (often "Yes")

const instructions = await sdk.orica.buildBuy(
  wallet.publicKey,
  userUsdcAccount,
  marketAddress,
  amount,
  outcomeIndex
);

const tx = new Transaction().add(...instructions);
const sig = await sendAndConfirmTransaction(connection, tx, [wallet]);
console.log("Buy transaction:", sig);

// Get current prices
const market = await sdk.orica.fetchMarket(marketAddress);
const prices = sdk.orica.calculatePrices(market);
const currentPrice = prices[outcomeIndex];

// Estimate shares received (approximate)
const amountUsdc = 100_000_000;
const amountAfterFees = amountUsdc * 0.983; // After 1.70% fee
const estimatedShares = amountAfterFees / currentPrice;

console.log(`Current price: $${currentPrice.toFixed(4)}`);
console.log(`Estimated shares: ${estimatedShares.toFixed(2)}`);

try {
  const instructions = await sdk.orica.buildBuy(
    wallet.publicKey,
    userUsdcAccount,
    marketAddress,
    amount,
    outcomeIndex
  );
  
  const tx = new Transaction().add(...instructions);
  await sendAndConfirmTransaction(connection, tx, [wallet]);
} catch (error) {
  if (error.message.includes("insufficient funds")) {
    console.error("Not enough USDC in wallet");
  } else if (error.message.includes("MarketClosed")) {
    console.error("Market is no longer accepting trades");
  } else {
    console.error("Transaction failed:", error);
  }
}

const position = await sdk.orica.fetchPosition(marketAddress, wallet.publicKey);
console.log("New position:", position.outcomeAmounts[outcomeIndex].toString());