import _ from 'lodash';

export default function (indexPattern) {
  const dateScripts = {};
  const scripts = {
    __dayOfMonth:   'dayOfMonth',
    __dayOfWeek:    'dayOfWeek',
    __dayOfYear:    'dayOfYear',
    __hourOfDay:    'hourOfDay',
    __minuteOfDay:  'minuteOfDay',
    __minuteOfHour: 'minuteOfHour',
    __monthOfYear:  'monthOfYear',
    __weekOfYear:   'weekOfWeekyear',
    __year:         'year'
  };

  _.each(indexPattern.fields.byType.date, function (field) {
    if (field.indexed) {
      _.each(scripts, function (value, key) {
        dateScripts[field.name + '.' + key] = 'doc["' + field.name + '"].date.' + value;
      });
    }
  });

  return dateScripts;
};
