// ElizaOS action: paid webpage extraction through ScanPay ReadClean (x402, Base USDC).
// Requires: @elizaos/core, @x402/core, @x402/fetch, @x402/evm, viem.
// Keep the private key outside prompts and logs; cap spending per day.
import type { Action, Plugin } from "@elizaos/core";
import { x402Client } from "@x402/core/client";
import { wrapFetchWithPayment } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const HOST = "https://scanpay-edge.alextaghiashvili.workers.dev";
const USDC = "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913";

export function scanpayReadCleanPlugin(privateKey: `0x${string}` = "0x"): Plugin {
  const client = new x402Client();
  client.register("eip155:8453", new ExactEvmScheme(privateKeyToAccount(privateKey)));
  const paidFetch = wrapFetchWithPayment(fetch, client);
  const action: Action = {
    name: "SCANPAY_READCLEAN",
    description: "Extract a public HTTPS page as clean Markdown. Costs 0.002 USDC per call.",
    similes: [],
    examples: [],
    validate: async () => true,
    handler: async (_runtime, message, _state, _options, callback) => {
      const match = message.content.text?.match(/^\/readclean\s+(https:\/\/\S+)\s*$/);
      if (!match) throw new Error("Use /readclean https://...");
      const response = await paidFetch(HOST + "/api/v1/readclean", {
        method: "POST",
        redirect: "error",
        headers: {"Content-Type": "application/json", "X-ScanPay-Source": "eliza"},
        body: JSON.stringify({url: match[1], format: "markdown"}),
        signal: AbortSignal.timeout(30000),
      });
      if (!response.ok) throw new Error("ScanPay HTTP " + response.status + "; do not auto-retry a payment");
      const data = await response.json() as {ok?: boolean; content?: string};
      if (data.ok !== true || !data.content?.trim()) throw new Error("Extraction failed; reconcile the payment before retrying");
      await callback?.({text: JSON.stringify(data)});
      return true;
    },
  };
  return {name: "scanpay-readclean", description: "Paid webpage extraction through x402.", actions: [action]};
}