function alloc_bytes(app, data)
{
  let stdlib_types___alloc_bytes__ = app.instance.exports['stdlib.types.__alloc_bytes__']

  if( typeof data == 'string' ) {
    // TODO: Unicode
    data = Uint8Array.from(data.split('').map(x => x.charCodeAt()));
  }

  let offset = stdlib_types___alloc_bytes__(data.length);
  let i8arr = new Uint8Array(app.instance.exports.memory.buffer, offset + 4, data.length);
  i8arr.set(data);

  return offset;
}

function run_times(times, callback, tweak)
{
  let sum = 0;
  let max = 0;
  let min = 1000000000000000000;
  let values = [];
  for(let idx = 0; idx < times; idx += 1) {
    if( tweak ) {
      tweak();
    }

    const t0 = performance.now();
    let result = callback();
    const t1 = performance.now();
    let time = t1 - t0;
    sum += time;
    values.push({'time': time, 'result': result});
    max = max < time ? time : max;
    min = min > time ? time : min;
  }
  return {
    'min': min,
    'avg': sum / times,
    'max': max,
    'sum': sum,
    'values': values,
  }
}

function test_result(is_pass, data)
{
  data = data || {};

  let result_details = document.createElement('details');

  let result_summary = document.createElement('summary');
  result_summary.textContent =
    (is_pass ? 'Test passed: ' : 'Test failed: ')
    + (data.summary ?? '(no summary)')
  ;
  result_summary.setAttribute('style', is_pass ? 'background: green' : 'background: red');
  result_details.appendChild(result_summary);

  if( data.attributes ) {
    result_table(data, result_details);
  }

  let results = document.getElementById('results');
  results.appendChild(result_details);
}

function result_table(attributes, parent)
{
  let table = document.createElement('table');

  Object.keys(attributes).forEach(idx => {
    let td0 = document.createElement('td');
    td0.setAttribute('style', 'vertical-align: top;');
    td0.textContent = idx;
    let td1 = document.createElement('td');
    if( typeof(attributes[idx]) == 'object' ) {
      let result_details = document.createElement('details');

      let result_summary = document.createElement('summary');
      result_summary.textContent = 'Show me';
      result_details.appendChild(result_summary);

      result_table(attributes[idx], result_details);

      td1.appendChild(result_details);
    } else {
      td1.textContent = attributes[idx];
    }

    let tr = document.createElement('tr');
    tr.appendChild(td0);
    tr.appendChild(td1);

    table.appendChild(tr);
  });
  parent.append(table);
}