content: package dk.alexandra.fresco.lib.statistics;
  
  import dk.alexandra.fresco.framework.Application;
  import dk.alexandra.fresco.framework.DRes;
  import dk.alexandra.fresco.framework.TestThreadRunner.TestThread;
  import dk.alexandra.fresco.framework.TestThreadRunner.TestThreadFactory;
  import dk.alexandra.fresco.framework.builder.numeric.Numeric;
  import dk.alexandra.fresco.framework.builder.numeric.ProtocolBuilderNumeric;
  import dk.alexandra.fresco.framework.sce.resources.ResourcePool;
  import dk.alexandra.fresco.framework.value.SInt;
  import java.math.BigInteger;
  import java.util.Arrays;
  import java.util.List;
  import java.util.stream.Collectors;
  import org.hamcrest.core.Is;
  import org.junit.Assert;
  
  /**
   * Test class for the DEASolver. Will generate a random data sample and perform a Data Envelopment
   * Analysis on it. The TestDEADSolver takes the size of the problem as inputs (i.e. the number of
   * input and output variables, the number of rows in the basis and the number of queries to perform.
   * The MPC result is compared with the result of a plaintext DEA solver.
   */
  public class CreditRaterTest {
  
  
    private static List<DRes<SInt>> knownArray(Numeric numeric, int[] values) {
      return Arrays.stream(values).mapToObj(BigInteger::valueOf).map(numeric::known)
          .collect(Collectors.toList());
    }
  
    public static class TestCreditRater<ResourcePoolT extends ResourcePool>
        extends TestThreadFactory<ResourcePoolT, ProtocolBuilderNumeric> {
  
      final int[] values;
      final int[][] intervals;
      final int[][] scores;
  
      /**
       * Creates an instance of the Credit rater tester.
       *
       * @param values    The values to score.
       * @param intervals The intervals at which to separate scores (we assume the same number of
       *                  intervals as values and scores.)
       * @param scores    The DEA scores The score you get per interval.
       */
      public TestCreditRater(int[] values, int[][] intervals, int[][] scores) {
        this.values = values;
        this.intervals = intervals;
        this.scores = scores;
      }
  
      @Override
      public TestThread<ResourcePoolT, ProtocolBuilderNumeric> next() {
        return new TestThread<ResourcePoolT, ProtocolBuilderNumeric>() {
          @Override
          public void test() throws Exception {
            Application<CreditRaterInput, ProtocolBuilderNumeric> input = producer -> {
              Numeric numeric = producer.numeric();
              int[] values = TestCreditRater.this.values;
              List<DRes<SInt>> closedValues = knownArray(numeric, values);
  
              List<List<DRes<SInt>>> closedIntervals = Arrays.stream(intervals)
                  .map(array -> knownArray(numeric, array)).collect(Collectors.toList());
  
              List<List<DRes<SInt>>> closedScores = Arrays.stream(scores)
                  .map(array -> knownArray(numeric, array)).collect(Collectors.toList());
              return () -> new CreditRaterInput(closedValues, closedIntervals, closedScores);
            };
            CreditRaterInput creditRaterInput = runApplication(input);
  
            CreditRater rater = new CreditRater(creditRaterInput.values, creditRaterInput.intervals,
                creditRaterInput.intervalScores);
            SInt creditRatingOutput = runApplication((builder) -> builder.seq(rater));
  
            Application<BigInteger, ProtocolBuilderNumeric> outputApp =
                seq -> seq.numeric().open(creditRatingOutput);
  
            BigInteger resultCreditOut = runApplication(outputApp);
  
            Assert.assertThat(resultCreditOut, Is.is(
                BigInteger.valueOf(PlaintextCreditRater.calculateScore(values, intervals, scores))));
          }
        };
      }
    }
  
    private static class CreditRaterInput {
  
      private final List<DRes<SInt>> values;
      private final List<List<DRes<SInt>>> intervals;
      private final List<List<DRes<SInt>>> intervalScores;
  
      private CreditRaterInput(List<DRes<SInt>> values, List<List<DRes<SInt>>> intervals,
          List<List<DRes<SInt>>> intervalScores) {
        this.values = values;
        this.intervals = intervals;
        this.intervalScores = intervalScores;
      }
    }
  
  }
  