route.ts

import { ActionGetResponse, ActionPostResponse } from "@solana/actions";
import { serialize } from "wagmi";
import { parseEther } from "viem";

// CAIP-2 format for Monad
const blockchain = `eip155:10143`;

// Wallet address that will receive the donations
const donationWallet = `<RECEIVER_ADDRESS>`;

// Create headers with CAIP blockchain ID
const headers = {
  "Access-Control-Allow-Origin": "*",
  "Access-Control-Allow-Methods": "GET, POST, OPTIONS",
  "Access-Control-Allow-Headers":
  "Content-Type, x-blockchain-ids, x-action-version",
  "Content-Type": "application/json",
  "x-blockchain-ids": blockchain,
  "x-action-version": "2.0",
};

// OPTIONS endpoint is required for CORS preflight requests
// Your Blink won't render if you don't add this
export const OPTIONS = async () => {
  return new Response(null, { headers });
};

// GET endpoint returns the Blink metadata (JSON) and UI configuration
export const GET = async (req: Request) => {
  // This JSON is used to render the Blink UI
  const response: ActionGetResponse = {
    type: "action",
    icon: `${new URL("/donate-mon.png", req.url).toString()}`,
    label: "1 MON",
    title: "Donate MON",
    description:
      "This Blink demonstrates how to donate MON on the Monad blockchain. It is a part of the official Blink Starter Guides by Dialect Labs.  \n\nLearn how to build this Blink: https://dialect.to/docs/guides/donate-mon",
    // Links is used if you have multiple actions or if you need more than one params
    links: {
      actions: [
        {
          // Defines this as a blockchain transaction
          type: "transaction",
          label: "0.01 MON",
          // This is the endpoint for the POST request
          href: `/api/actions/donate-mon?amount=0.01`,
        },
        {
          type: "transaction",
          label: "0.05 MON",
          href: `/api/actions/donate-mon?amount=0.05`,
        },
        {
          type: "transaction",
          label: "0.1 MON",
          href: `/api/actions/donate-mon?amount=0.1`,
        },
        {
          // Example for a custom input field
          type: "transaction",
          href: `/api/actions/donate-mon?amount={amount}`,
          label: "Donate",
          parameters: [
            {
              name: "amount",
              label: "Enter a custom MON amount",
              type: "number",
            },
          ],
        },
      ],
    },
  };

  // Return the response with proper headers
  return new Response(JSON.stringify(response), {
    status: 200,
    headers,
  });
};

// POST endpoint handles the actual transaction creation
export const POST = async (req: Request) => {
    try {
      // Extract amount from URL
      const url = new URL(req.url);
      const amount = url.searchParams.get("amount");

      if (!amount) {
          throw new Error("Amount is required");
      }

      // Build the transaction
      const transaction = {
          to: donationWallet,
          value: parseEther(amount).toString(),
          chainId: 10143,
      };

      const transactionJson = serialize(transaction);

      // Build ActionPostResponse
      const response: ActionPostResponse = {
          type: "transaction",
          transaction: transactionJson,
          message: "Donate MON",
      };

      // Return the response with proper headers
      return new Response(JSON.stringify(response), {
          status: 200,
          headers,
      });
    } catch (error) {
      // Log and return an error response
      console.error("Error processing request:", error);
      return new Response(JSON.stringify({ error: "Internal server error" }), {
        status: 500,
        headers,
      });
  }
};