/**
 * The script is used by Chainlink nodes to execute the external adapter logic.
 *
 * It will call the pricing API and return the price of a house.
 *
 * API requirements:
 * - API key
 */
const { ethers } = await import("npm:ethers@6.10.0");

if (!secrets.apiKey) {
  throw new Error(
    "FRED API KEY is required to access the API data. Please provide one."
  );
}

const API_URL = `https://api.stlouisfed.org/fred/series/observations?series_id=DPRIME&api_key=${secrets.apiKey}&file_type=json&sort_order=desc&limit=1`;
console.log(`Making request to: ${API_URL}`);
console.log(`API Key present: ${!!secrets.apiKey}`);

const primeRateRequest = await Functions.makeHttpRequest({
  url: API_URL,
});

console.log(`Response status: ${primeRateRequest.status}`);
console.log(`Response data: ${JSON.stringify(primeRateRequest.data)}`);

if (!primeRateRequest.data) {
  throw new Error(`API request failed with status ${primeRateRequest.status}. Response: ${JSON.stringify(primeRateRequest)}`);
}

if (!primeRateRequest.data?.observations || primeRateRequest.data.observations.length === 0) {
  throw new Error(`API response missing observations field. Full response: ${JSON.stringify(primeRateRequest.data)}`);
}

// The response from the API is expected to be in JSON format
const primeRate = primeRateRequest.data.observations[0].value; // returns e.g 7.5

return Functions.encodeUint256(ethers.parseUnits(primeRate.toString(), 25));