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package edu.byu.hbll.box.internal.util;

import edu.byu.hbll.box.BoxQuery;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * Random utilities used by Box.
 *
 * @author Charles Draper
 */
public class BoxUtils {

  /**
   * Converts non _at_doc fields into _at_doc fields.
   *
   * @param fields dot-notated fields denoting what should be projected
   * @return the new fields
   */
  public static Set canonicalizeFields(Collection fields) {
    return Collections.unmodifiableSet(
        (Set)
            fields
                .stream()
                .map(
                    field -> {
                      if (!field.equals(BoxQuery.DOCUMENT_FIELD)
                          && !field.startsWith("@doc.")
                          && !field.equals(BoxQuery.METADATA_FIELD)
                          && !field.startsWith("@box.")) {
                        return "@doc." + field;
                      } else {
                        return field;
                      }
                    })
                .collect(Collectors.toCollection(LinkedHashSet::new)));
  }
}