getheads();
function getheads() {
  let promised = fetch(api_url + 'getheads').
  then(resp => resp.json()).
  then(obj => {
    let elem = document.getElementById('json');
    elem.innerText = JSON.stringify(obj);

    let list = '<ul>';
    for (let b of obj.HEADs) {
      console.log('getheads.b:',b);
      let blk_url = api_url + `getblock?hash=${b.bkhash}`;
      let content_url = api_url + `getblock?addr=${b.bkaddr}`;
      let peerid = b.bkcontent.audit.peerid;
      let whois_url = api_url + `whois?pub=${peerid}`
      list += `<li><a href="${blk_url}">${b.bkhash}</a> by <a href="${whois_url}">${peerid}</a>: `+
              `<a href="${content_url}">${b.bkaddr}</a> ${b.bkprev} pow:${b.pow}</li>`;
    }
    list += '</ul>';
    elem = document.getElementById('list');
    elem.innerHTML = list;

    return obj;
  }).
  catch(console.error);  
  promised.then(obj => { console.log('obj:',obj); return obj; });

}


// ----------------------------------------------------

async function getnodes() {
  let config = await fetch(api_url + 'config').
  then(resp => resp.json()).
  then(obj => { return obj.config }).
  catch(console.error);  
  console.log('nodes.config:',config);

  let n = 1;
  let list = '<ul>';
  let nodes = [];
  for (node of config.nodes) {
    console.log('nodes.node:',node);
    let [ip,port] = node.split(':');
    let info = await get_info(node);
    nodes.push(info);
    let url=`http://${node}`;
    let status='offline';
    let info_url = `${url}${api_url}getinfo`;
    list += `<li>node${n} (:${port}) <a href="${url}">${node}</a> ${status} <a href="${info_url}">information</a></li>\n`;
    console.log('nodes.info:',info);
    n++;
  }
  list += '</ul>';
  let elem = document.getElementById('list');
  elem.innerHTML = list;
  return nodes;
}
function get_info(node) {
 let [ip,port] = node.split(':');
 let remote_api_url = `http://${node}${api_url}`;
 let promised = fetch(remote_api_url + 'getinfo').
    then(resp => resp.json).
    then(obj => { let info = obj.info; return info; }).
    catch(console.error);
 return promised;
}



console.log('heads.js loaded');