function pad(num, size) {
  var s = num+"";
  while (s.length < size) s = "0" + s;
  return s;
}

$(document).ready(function () {
  $('[data-fill]').click(function (e) {
    e.preventDefault()
    $($(this).data('fill')).val($(this).data('fill-text')).trigger('input')
  });

  $('#copy-ref-url').click(function () {
    $('#copy-ref-url').text('Copied!');
    copyToClipboard(document.getElementById('ref_url'));
    setTimeout(function () {
      $('#copy-ref-url').text('Copy')
    }, 1000)
  })

  $('#copy-btc-address').click(function () {
    $('#copy-btc-address').text('Copied!');
    copyToClipboard(document.getElementById('btc_address'));
    setTimeout(function () {
      $('#copy-btc-address').text('Copy')
    }, 1000)
  })

  $('#copy-hxt-address').click(function () {
    $('#copy-hxt-address').text('Copied!');
    copyToClipboard(document.getElementById('hxt_address'));
    setTimeout(function () {
      $('#copy-hxt-address').text('Copy')
    }, 1000)
  })

  function copyToClipboard(elem) {
    // create hidden text element, if it doesn't already exist
    var targetId = "_hiddenCopyText_";
    var isInput = elem.tagName === "INPUT" || elem.tagName === "TEXTAREA";
    var origSelectionStart, origSelectionEnd;
    if (isInput) {
      // can just use the original source element for the selection and copy
      target = elem;
      origSelectionStart = elem.selectionStart;
      origSelectionEnd = elem.selectionEnd;
    } else {
      // must use a temporary form element for the selection and copy
      target = document.getElementById(targetId);
      if (!target) {
        var target = document.createElement("textarea");
        target.style.position = "absolute";
        target.style.left = "-9999px";
        target.style.top = "0";
        target.id = targetId;
        document.body.appendChild(target);
      }
      target.textContent = elem.textContent;
    }
    // select the content
    var currentFocus = document.activeElement;
    target.focus();
    target.setSelectionRange(0, target.value.length);

    // copy the selection
    var succeed;
    try {
      succeed = document.execCommand("copy");
    } catch(e) {
      succeed = false;
    }
    // restore original focus
    if (currentFocus && typeof currentFocus.focus === "function") {
      currentFocus.focus();
    }

    if (isInput) {
      // restore prior selection
      elem.setSelectionRange(origSelectionStart, origSelectionEnd);
    } else {
      // clear temporary content
      target.textContent = "";
    }
    return succeed;
  }

  $('#hxt_amount').on('input', function () {
    fillInputs($(this).val())
  })

  function fillInputs(hxt_amount) {
    if (typeof hxt_to_btc === 'undefined') {
      return;
    }

    $('#btc_amount').val((hxt_amount * hxt_to_btc).toFixed(8));
    $('#total_usd').text((hxt_amount * hxt_to_usd).toFixed(2))
    $('#pay_btc').text((hxt_amount * hxt_to_btc).toFixed(8))
    $('#receive_hxt').text(hxt_amount)
  }

  fillInputs($('#hxt_amount').val())

  $('#ico-form').on('submit', function (e) {
    if (!$('#agree').prop('checked')) {
      alert('Please accept an agreement.');
      e.preventDefault()
      return false
    }
  });

  var number = document.getElementById('hxt_amount');

  // Listen for input event on numInput.
  if (number !== null) {
    number.onkeydown = function(e) {
      if(!((e.keyCode > 95 && e.keyCode < 106)
          || (e.keyCode > 47 && e.keyCode < 58)
          || e.keyCode == 8)) {
        return false;
      }
    }
  }
})
