/*
 * Copyright (c) 2016, Metron, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Metron, Inc. nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL METRON, INC. BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.metsci.glimpse.dnc.geosym;

import static com.metsci.glimpse.util.GeneralUtils.newUnmodifiableList;

import java.util.List;
import java.util.function.Function;

public class DncGeosymAttributeCompoundExpression implements DncGeosymAttributeExpression
{

    public final String connectorOp;
    public final List<? extends DncGeosymAttributeExpression> terms;


    public DncGeosymAttributeCompoundExpression(String connectorOp, List<? extends DncGeosymAttributeExpression> terms)
    {
        this.connectorOp = connectorOp;
        this.terms = newUnmodifiableList(terms);
    }

    @Override
    public boolean eval(Function<String,Object> featureAttrs, Function<String,Object> externalAttrs)
    {
        if ("and".equals(connectorOp)) return evalAnd(terms, featureAttrs, externalAttrs);
        else if ("or".equals(connectorOp)) return evalOr(terms, featureAttrs, externalAttrs);
        else if ("AND".equals(connectorOp)) return evalAnd(terms, featureAttrs, externalAttrs);
        else if ("OR".equals(connectorOp)) return evalOr(terms, featureAttrs, externalAttrs);
        else throw new RuntimeException("Unrecognized connector operator: " + connectorOp);
    }

    public static boolean evalAnd(List<? extends DncGeosymAttributeExpression> terms, Function<String,Object> featureAttrs, Function<String,Object> externalAttrs)
    {
        for (DncGeosymAttributeExpression term : terms)
        {
            if (!term.eval(featureAttrs, externalAttrs)) return false;
        }
        return true;
    }

    public static boolean evalOr(List<? extends DncGeosymAttributeExpression> terms, Function<String,Object> featureAttrs, Function<String,Object> externalAttrs)
    {
        for (DncGeosymAttributeExpression term : terms)
        {
            if (term.eval(featureAttrs, externalAttrs)) return true;
        }
        return false;
    }

    @Override
    public String toString()
    {
        StringBuilder s = new StringBuilder();
        for (DncGeosymAttributeExpression term : terms)
        {
            s.append("(").append(term).append(") ").append(connectorOp).append(" ");
        }

        // Drop the trailing operator and spaces
        s.setLength(s.length() - connectorOp.length() - 2);

        return s.toString();
    }

}