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/**
 * Copyright (C) 2010-2016 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see .
 */
package org.evosuite.xsd;

import java.util.HashSet;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * GenerationUtil class
 * 
 * Useful to get data (total, averages, etc) from a {@code Generation} instance.
 * 
 * @author José Campos
 */
public abstract class GenerationUtil {

  /**
   * Total Numbers
   */

  /**
   * Returns the total length (i.e., number of statements) of a successful generation
   * 
   * @param generation
   * @return total length or 0 if the generation failed
   */
  public static int getNumberStatements(Generation generation) {
    if (generation == null || generation.isFailed() || generation.getSuite() == null) {
      return 0;
    }

    return generation.getSuite().getTotalNumberOfStatements().intValue();
  }

  /**
   * Returns the total time (minutes) spent on a generation
   * 
   * @param generation
   * @return total time (minutes) spent on a generation or 0 if the generation failed
   */
  public static int getTotalEffort(Generation generation) {
    if (generation == null || generation.isFailed() || generation.getSuite() == null) {
      return 0;
    }

    return (int) Math.ceil(generation.getSuite().getTotalEffortInSeconds().doubleValue() / 60.0);
  }

  /**
   * Returns the total time (minutes) settled by the scheduler
   * 
   * @param generation
   * @return total time (minutes) settled by the scheduler or 0 if the generation failed
   */
  public static int getTimeBudget(Generation generation) {
    if (generation == null) {
      return 0;
    }

    return (int) Math.ceil(generation.getTimeBudgetInSeconds().doubleValue() / 60.0);
  }

  /**
   * Returns the total number of generated tests of a successful generation
   * 
   * @param generation
   * @return total number of tests or 0 if the generation failed
   */
  public static int getNumberTests(Generation generation) {
    if (generation == null || generation.isFailed() || generation.getSuite() == null) {
      return 0;
    }

    return generation.getSuite().getNumberOfTests().intValue();
  }

  /**
   * Returns all criteria used on a successful generation
   * 
   * @param generation
   * @return all criteria used or an empty Set<> if the generation failed
   */
  public static Set getCriteria(Generation generation) {
    if (generation == null || generation.isFailed() || generation.getSuite() == null) {
      return new HashSet();
    }

    return generation.getSuite().getCoverage().parallelStream()
        .map(c -> c.getCriterion())
        .collect(Collectors.toSet());
  }

  /**
   * Returns the coverage of a particular criterion of a successful generation
   * 
   * @param generation
   * @param criterionName
   * @return coverage of a criterion or 0.0 if the generation failed
   */
  public static double getCriterionCoverage(Generation generation, String criterionName) {
    if (generation == null || generation.isFailed() || generation.getSuite() == null) {
      return 0.0;
    }

    for (Coverage coverage : generation.getSuite().getCoverage()) {
      if (coverage.getCriterion().equals(criterionName)) {
        return coverage.getCoverageValue();
      }
    }

    return 0.0; // criterionName not found
  }

  /**
   * Averages
   */

  /**
   * Returns the overall coverage of a successful generation
   * 
   * @param generation
   * @return overall coverage or 0.0 if the generation failed
   */
  public static double getOverallCoverage(Generation generation) {
    if (generation == null || generation.isFailed() || generation.getSuite() == null) {
      return 0.0;
    }

    return generation.getSuite().getCoverage().parallelStream()
        .mapToDouble(c -> c.getCoverageValue())
        .average()
        .getAsDouble();
  }
}