/**
 * Core — Block heights and gas fees.
 *
 * Run: npx tsx examples/02-core.ts
 */
import { Spectrum } from '@spectrumnodes/sdk';

const spectrum = new Spectrum({ api: process.env.SPECTRUM_API! });

async function main() {
  // --- getBlockHeight ---
  const eth = await spectrum.core.getBlockHeight('ethereum');
  console.log(`Ethereum block: ${eth.height}`);

  // --- getGasComparison ---
  const gas = await spectrum.core.getGasComparison();
  console.log('\nGas comparison across EVM chains:');
  for (const g of gas.results) {
    console.log(`  ${g.chain}: ${g.baseFeeGwei} gwei, ~$${g.estimatedTxCostUsd} per tx`);
  }

  // --- getBlockTransactions ---
  const block = await spectrum.core.getBlockTransactions('ethereum', 21000000);
  console.log(`\nBlock 21M: ${block.transactionCount} transactions`);
  for (const tx of block.transactions.slice(0, 3)) {
    console.log(`  ${tx.hash.slice(0, 20)}... from ${tx.from.slice(0, 12)}...`);
  }

  // --- estimateGas ---
  // Plain ETH transfer between EOAs. Pointing `to` at a contract without `data`
  // usually reverts (most contracts have no payable fallback).
  const VITALIK = '0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045';
  const estimate = await spectrum.core.estimateGas('ethereum', {
    to: VITALIK,
    from: VITALIK,
    value: '0x0',
  });
  console.log(`\nGas estimate for simple call: ${estimate.gasEstimate}`);
}

main().catch(console.error);