// Utilities

const characters ='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
function randomString(length) {
  let result = '';
  const charactersLength = characters.length;
  for ( let i = 0; i < length; i++ ) {
    result += characters.charAt(Math.floor(Math.random() * charactersLength));
  }
  return result;
}

// serializeObject tweak to allow '.' to nest keys, and '-' in keys
/*
$.extend(FormSerializer.patterns, {
  fixed:    /^\d+$/,
  validate: /^[a-z][a-z0-9_-]*(?:\.[a-z0-9_-]+|\[[0-9]+\])*(?:\[\])?$/i,
  key:      /[a-z0-9_-]+|(?=\[\])/gi,
  named:    /^[a-z0-9_-]+$/i
});
 */

// deserializeObject
/*
jQuery.fn.populate = function (data) {
  if (!this.is('form')) throw "Error: ${this} is not a form";
  populate(this[0], data);
  return this;
};
 */

// crypto

async function digestMessage(message) {
  const msgUint8 = new TextEncoder().encode(message);                           // encode as (utf-8) Uint8Array
  const hashBuffer = await crypto.subtle.digest('SHA-256', msgUint8);           // hash the message
  const hashArray = Array.from(new Uint8Array(hashBuffer));                     // convert buffer to byte array
  const hashHex = hashArray.map((b) => b.toString(16).padStart(2, '0')).join(''); // convert bytes to hex string
  return hashHex;
}

// number formats

function setDecimals() {
  // due to a W3C decision, "number" inputs do not expose their selection, breaking inputmask library
  $('input[data-decimals="0"]').inputmask({ alias: 'integer', placeholder: '0', groupSeparator: ' ' });
  $('input[data-decimals="1"]').inputmask({ alias: 'numeric', placeholder: '0', groupSeparator: ' ', digits: 1 });
  $('input[data-decimals="2"]').inputmask({ alias: 'numeric', placeholder: '0', groupSeparator: ' ', digits: 2 });
  $('input[data-decimals="3"]').inputmask({ alias: 'numeric', placeholder: '0', groupSeparator: ' ', digits: 3 });
  $('input[data-decimals="4"]').inputmask({ alias: 'numeric', placeholder: '0', groupSeparator: ' ', digits: 4 });
  $('input.number:not([data-decimals]):not([data-digits])').inputmask({ alias: 'numeric', placeholder: '', groupSeparator: ' '});
  $('input[data-digits="2"]').inputmask({ alias: 'currency', placeholder: '0', groupSeparator: ' ', digits: 2, digitsOptional: false });
  $('input[data-digits="4"]').inputmask({ alias: 'currency', placeholder: '0', groupSeparator: ' ', digits: 4, digitsOptional: false });
}

/*
$(() => {
  setDecimals();
});
 */

function populateSelect(select, list, empty = false) {
  select.empty();
  if (empty) select.append('<option></option>');
  list.forEach(option => select.append(`<option value="${option.key}">${option.value}</option>`));
}

function spinner(show) {
  if (show) $('#backdrop').addClass('active');
  else $('#backdrop').removeClass('active');
}

function exportCSV(filename, content) {
  let body = content.map(s => [].concat(s).join(';')).join('\n');
  let blob = new Blob(['\uFEFF', body], {type: 'text/csv;charset=utf-8'});
  let link = document.createElement("a");
  let url = URL.createObjectURL(blob);
  link.setAttribute("href", url);
  link.setAttribute("download", filename);
  //link.setAttribute("target", "_blank")
  link.style.visibility = 'hidden';
  document.body.appendChild(link);
  link.click();
  document.body.removeChild(link);
}

/* modals */

NodeList.prototype.modal = function(show) {
  this.item(0).modal(show);
  return this;
}
Element.prototype.modal = function(show) {
  if (show) {
    document.body.addClass('dimmed');
    this.addClass('active');
  }
  else {
    this.removeClass('active');
    document.body.removeClass('dimmed');
  }
  return this;
}

/* DOM helpers */

function formValue(name) {
  let ctl = $(`[name="${name}"]`)[0];
  let type = ctl.tagName;
  if (
    (type === 'INPUT' && ['text', 'number'].includes(ctl.attr('type'))) ||
    type === 'SELECT'
  ) {
    return ctl.value;
  } else if (type === 'INPUT' && ctl.attr('type') === 'radio') {
    ctl = $(`input[name="${name}"]:checked`)[0];
    if (ctl) return ctl.value;
  } else if (type === 'INPUT' && ctl.attr('type') === 'radio') {
    return ctl.checked;
  }
  console.error(`unknown input name: ${name}`);
  return null;
}

function msg(id) {
  let ctl = $(`#${id}`)[0];
  return ctl.textContent;
}

function spinner(show) {
  if (show) $('#backdrop').addClass('active');
  else $('#backdrop').removeClass('active');
}

onLoad(() => {
  /*
  document.on('click', e => {
    if (!e.target.closest('.modal')) $('.modal').hide();
  })
   */
  $('i.close.icon').on('click', e => {
    let modal = e.target.closest('.modal');
    if (modal) modal.modal(false);
  });
  $('.modal .actions .cancel').on('click', e => {
    e.target.closest('.modal').modal(false);
  });
  $('#dimmer').on('click', e => $('.modal').modal(false));
});