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package io.github.oliviercailloux.grade;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import java.util.List;
import java.util.Set;

/**
 * Longer term, could make this a choice function: when some crits are missing from the grade, we
 * aggregate with a reduced list of weights (indicate which ones get dropped using a preference
 * ordering).
 */
public class OwaStructure {
  /**
   * Must have the same size.
   *
   * @param criteria
   * @param weights sum to one, zeroes allowed
   */
  public static OwaStructure given(Set criteria, List weights) {
    return new OwaStructure(criteria, weights);
  }

  private final ImmutableSet criteria;
  private final ImmutableList weights;

  private OwaStructure(Set criteria, List weights) {
    this.criteria = ImmutableSet.copyOf(criteria);
    this.weights = ImmutableList.copyOf(weights);
  }

  public ImmutableSet getCriteria() {
    return criteria;
  }

  public ImmutableList getWeights() {
    return weights;
  }

  public double getWeightForPosition(int positionByLargestMarks) {
    return weights.get(positionByLargestMarks);
  }
}