///////////////////////////////////////////////////////////////////////////////
// For information as to what this class does, see the Javadoc, below.       //
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// 2007, 2008, 2009, 2010, 2014, 2015, 2022 by Peter Spirtes, Richard        //
// Scheines, Joseph Ramsey, and Clark Glymour.                               //
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// it under the terms of the GNU General Public License as published by      //
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package edu.cmu.tetrad.bayes;

import edu.cmu.tetrad.data.DataSet;
import edu.cmu.tetrad.data.DiscreteVariable;
import edu.cmu.tetrad.graph.Node;

import java.util.List;

/**
 * Static utility methods for Bayes nets.
 *
 * @author josephramsey
 */
final class BayesUtils {

    /**
     * Ensures that the discrete variables in the given list are compatible with
     * the variables in the data set by the same names. If a variable x in the
     * list has a superlist of the categories for x in the data, the data
     * variables is changed.
     *
     * @throws IllegalArgumentException if a variable exists in the list for
     *                                  which no variable occurs in the data by
     *                                  the same name or if the variable in the
     *                                  data by the same name does not have a
     *                                  subset of its categories.
     */
    public static void ensureVarsInData(List<Node> pmVars,
                                        DataSet dataSet) {
        for (Node pmVar1 : pmVars) {
            DiscreteVariable pmVar = (DiscreteVariable) pmVar1;
            String name = pmVar.getName();
            DiscreteVariable from =
                    (DiscreteVariable) dataSet.getVariable(name);

            if (from == null) {
                throw new IllegalArgumentException("Variable " + pmVar + " was not in the data.");
            }

            List<String> pmCategories = pmVar.getCategories();
            List<String> dataCategories = from.getCategories();

            if (!pmCategories.equals(dataCategories)) {
                if (pmCategories.containsAll(dataCategories)) {
                    DiscreteVariable to = new DiscreteVariable(pmVar);
                    dataSet.changeVariable(from, to);
                } else {
                    throw new IllegalArgumentException("Variable '" + name + "' " +
                            "has more categories in the data than in the model." +
                            "\n\tIn the model, the categories are: " + pmCategories + "." +
                            "\n\tIn the data, the categories are: " + dataCategories + ".");
                }
            }
        }
    }
}





