Calculate estimated time until next NRG Masternode reward

estimate.js

const nodeApi = "https://nodeapi.energi.network/";

const owner = "YOUR_MASTERNODE_OWNER_ADDRESS"

estimateBlocksTilNextMasternodeReward(owner)
.then(({ estimatedTimestamp }) => console.log(`Next reward at ${new Date(estimatedTimestamp).toLocaleString()}`))

function listMasternodes () {
  return rpc(nodeApi, "masternode_listMasternodes");
}

async function estimateBlocksTilNextMasternodeReward(
  owner
) {
  // Load current list of masternodes
  const { result } = await listMasternodes();
  
  // Find the current masternode rank
  const rank = result.findIndex(({ Owner }) => Owner === owner);
  const masternode = result[rank]
  
  // If masternode not found throw error
  if (!masternode) throw new Error(`Masternode Owner "${owner}" not found`)
  
  // Create list of masternodes in queue ahead of us
  const precedingResults = result.slice(0, rank);
  
  // Convert binary representation to JS number array
  const precedingAmounts = precedingResults.map(
    ({ Collateral }) => parseInt(Collateral) / 1e18
  );
  
  // Calculate sum of collateral
  const precedingCollateral = precedingAmounts.reduce((acc, c) => acc + c, 0);
  
  // Estimated blocks until next reward
  // Each block the queue receives 9.14 NRG per 10000 Collateral
  const blocks = Math.floor(precedingCollateral / 10000);
  
  // Estimated timestamp of next reward
  const estimatedTimestamp = Date.now() + (blocks * 1000);

  return { rank, blocks, estimatedTimestamp }
}

async function rpc(
  url = "",
  method = "",
  params =[],
  id = 15
) {
  return fetch(url, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ jsonrpc: "2.0", id: 15, method, params }),
  }).then((v) => v.json());
}