// Shared timetable group form view-model builder.

function buildDefaultTimetableGroup() {
  return {
    id: null,
    name: '',
    shortDescription: ''
  };
}

function formatDateTimeLocalValue(value) {
  if (!value) {
    return '';
  }

  const date = new Date(value);
  if (Number.isNaN(date.getTime())) {
    return '';
  }

  const year = String(date.getFullYear()).padStart(4, '0');
  const month = String(date.getMonth() + 1).padStart(2, '0');
  const day = String(date.getDate()).padStart(2, '0');
  const hours = String(date.getHours()).padStart(2, '0');
  const minutes = String(date.getMinutes()).padStart(2, '0');
  return `${year}-${month}-${day}T${hours}:${minutes}`;
}

function buildTimetableGroupFormViewModel(timetableGroup, timetableEntries, message, currentUser, isEdit) {
  const viewTimetableGroup = Object.assign(buildDefaultTimetableGroup(), timetableGroup || {});
  const viewTimetableEntries = Array.isArray(timetableEntries) && timetableEntries.length
    ? timetableEntries.map(function (entry) {
        return Object.assign({}, entry, {
          startValue: formatDateTimeLocalValue(entry.start_datetime),
          endValue: formatDateTimeLocalValue(entry.end_datetime)
        });
      })
    : [{ id: null, title: '', short_description: '', startValue: '', endValue: '', sort_order: 0 }];

  return {
    title: isEdit ? 'Edit timetable group' : 'Add timetable group',
    active: 'timetables',
    message: message,
    currentUser: currentUser || null,
    isEdit: Boolean(isEdit),
    timetableGroup: viewTimetableGroup,
    timetableEntries: viewTimetableEntries,
    inUse: Boolean(viewTimetableGroup.inUse),
    showSaveSecondaryActions: Boolean(isEdit),
    deleteDisabled: !isEdit || Boolean(viewTimetableGroup.inUse),
    formAction: isEdit && viewTimetableGroup.id ? '/data-sources/timetables/' + viewTimetableGroup.id : '/data-sources/timetables',
    formAttrs: 'data-async-save' + (isEdit ? ' data-async-save-close-url="/data-sources/timetables"' : ' data-async-save-new-redirect="response-url"') + ' data-async-save-new-url="/data-sources/timetables/new"',
    cancelUrl: '/data-sources/timetables',
    deleteUrl: isEdit && viewTimetableGroup.id ? '/data-sources/timetables/' + viewTimetableGroup.id + '/delete' : '',
    assetVersion: Date.now().toString(36)
  };
}

module.exports = {
  buildTimetableGroupFormViewModel: buildTimetableGroupFormViewModel
};