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/*
 * Copyright (C) 2008 Steve Ratcliffe
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  This program 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 General Public License for more details.
 *
 *
 * Author: Steve Ratcliffe
 * Create date: 07-Nov-2008
 */

package uk.me.parabola.mkgmap.osmstyle;

import uk.me.parabola.log.Logger;
import uk.me.parabola.mkgmap.osmstyle.eval.Op;
import uk.me.parabola.mkgmap.reader.osm.Element;
import uk.me.parabola.mkgmap.reader.osm.GType;
import uk.me.parabola.mkgmap.reader.osm.Rule;
import uk.me.parabola.mkgmap.reader.osm.TypeResult;

/**
 * A rule that contains a condition.  If the condition is matched by the
 * element then the finalize rule is executed and the held gtype is returned.
 *
 * @author Steve Ratcliffe
 */

public class ExpressionRule implements Rule {
        private static final Logger statsLog = Logger.getLogger(ExpressionRule.class.getPackage().getName()+".stats");

        private Op expression;
        private final GType gtype;
        private Rule finalizeRule;
        private long numEval; // count how often the expression was evaluated
        private long numTrue; // count how often the evaluation returned true

        /** Finalize rules must not have an element type definition so the add method must never be called. */
        private static final TypeResult finalizeTypeResult = (el, type) -> {
                throw new UnsupportedOperationException("Finalize rules must not contain an element type definition.");
        };
       
        public ExpressionRule(Op expression, GType gtype) {
                this.expression = expression;
                this.gtype = gtype;
        }

       
        public void resolveType(Element el, TypeResult result) {
                numEval++;
                if (expression.eval(el)) {
                        numTrue++;
                        // expression matches
                        if (finalizeRule != null) {
                                if (gtype.isContinueSearch()) {
                                        el = el.copy();
                                }
                                // run the finalize rules
                                if (gtype.getDefaultName() != null)
                                        el.addTag("mkgmap:default_name", gtype.getDefaultName());
                                finalizeRule.resolveType(el, finalizeTypeResult);
                        }
                        result.add(el, gtype);
                }
        }

        public int resolveType(int cacheId, Element el, TypeResult result) {
                numEval++;
                if (expression.eval(cacheId, el)){
                        numTrue++;
                        if (finalizeRule != null) {
                                if (gtype.isContinueSearch()) {
                                        el = el.copy();
                                }
                                // run the finalize rules
                                if (gtype.getDefaultName() != null)
                                        el.addTag("mkgmap:default_name", gtype.getDefaultName());
                                cacheId = finalizeRule.resolveType(cacheId, el, finalizeTypeResult);
                        }
                        result.add(el, gtype);
                }
                return cacheId;
        }

        public String toString() {
                return expression.toString() + ' ' + gtype;
        }

        public void setFinalizeRule(Rule finalizeRule) {
                this.finalizeRule = finalizeRule;
        }
       
        @Override
        public Rule getFinalizeRule() {
                return finalizeRule;
        }

        public Op getOp(){
                return expression;
        }

        public void setOp(Op expression){
                this.expression = expression;
        }

        @Override
        public void printStats(String header) {
                if (statsLog.isInfoEnabled())
                        statsLog.info(header,"stats (rule/evals/true)", this.toString() + "/" + numEval + "/" + numTrue);
        }

        @Override
        public boolean containsExpression(String exp) {
                return expression.toString().contains(exp);
        }

        @Override
        public void augmentWith(uk.me.parabola.mkgmap.reader.osm.ElementSaver elementSaver) {
                expression.augmentWith(elementSaver);
        }

}