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app.post("/generate-payment", async (req, res) => {
  const { userWalletAddress, amountInSOL = 0.015 } = req.body;

  if (!userWalletAddress) {
    return res.status(400).json({ success: false, error: "User wallet address is required" });
  }
  try {
    new PublicKey(userWalletAddress);
    new PublicKey(YOUR_WALLET_ADDRESS);
  } catch {
    return res.status(400).json({ success: false, error: "Invalid wallet address" });
  }

  const amountInLamports = amountInSOL * LAMPORTS_PER_SOL;
  res.json({
    success: true,
    paymentDetails: {
      receiver: YOUR_WALLET_ADDRESS,
      userWalletAddress,
      amountInSOL,
      amountInLamports,
    },
  });
});



app.post("/verify-payment", async (req, res) => {
  const { transactionSignature } = req.body;
  const { latestBlockhash } = req.body;
  if (!transactionSignature) {
    return res.status(400).json({ success: false, error: "Transaction signature is required" });
  }

  let retries = 0;
  const maxRetries = 10;
  while (retries < maxRetries) {
    try {
      console.log(`Transaction Signature: ${transactionSignature}`);
      console.log(`Blockhash : ${latestBlockhash}`);
      console.log(`Checking transaction attempt ${retries + 1}...`);
      const status = await connection.getSignatureStatus(transactionSignature, { searchTransactionHistory: true });
      if (status?.value?.confirmationStatus === "confirmed") {
        return res.json({ success: true, message: "Payment verified" });
      }
    } catch (error) {
      console.error("Error verifying transaction:", error);
    }
    retries++;
    await new Promise((resolve) => setTimeout(resolve, 5000));
  }

  res.status(500).json({ success: false, error: "Transaction not found or not confirmed" });
});