/*
 * Copyright 2011 JBoss Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.drools.planner.examples.nqueens.domain.solution;

import org.apache.commons.lang.builder.CompareToBuilder;
import org.drools.planner.api.domain.entity.PlanningEntityDifficultyWeightFactory;
import org.drools.planner.core.solution.Solution;
import org.drools.planner.examples.curriculumcourse.domain.Course;
import org.drools.planner.examples.nqueens.domain.NQueens;
import org.drools.planner.examples.nqueens.domain.Queen;

public class QueenDifficultyWeightFactory implements PlanningEntityDifficultyWeightFactory {

    public Comparable createDifficultyWeight(Solution solution, Object planningEntity) {
        NQueens nQueens = (NQueens) solution;
        Queen queen = (Queen) planningEntity;
        int distanceFromMiddle = calculateDistanceFromMiddle(nQueens.getN(), queen.getColumnIndex());
        return new QueenDifficultyWeight(queen, distanceFromMiddle);
    }

    private static int calculateDistanceFromMiddle(int n, int columnIndex) {
        int middle = n / 2;
        int distanceFromMiddle = Math.abs(columnIndex - middle);
        if ((n % 2 == 0) && (columnIndex < middle)) {
            distanceFromMiddle--;
        }
        return distanceFromMiddle;
    }

    public static class QueenDifficultyWeight implements Comparable<QueenDifficultyWeight> {

        private final Queen queen;
        private final int distanceFromMiddle;

        public QueenDifficultyWeight(Queen queen, int distanceFromMiddle) {
            this.queen = queen;
            this.distanceFromMiddle = distanceFromMiddle;
        }

        public int compareTo(QueenDifficultyWeight other) {
            return new CompareToBuilder()
                    .append(distanceFromMiddle, other.distanceFromMiddle)
                    .append(queen.getColumnIndex(), other.queen.getColumnIndex())
                    .toComparison();
        }

    }

}

@@ -844,75 +844,8 @@
 on;%0A
-import org.drools.planner.examples.curriculumcourse.domain.Course;%0A
 impo
@@ -2175,16 +2175,101 @@
 ilder()%0A
+                    // The more difficult queens have a lower distance to the middle%0A
         
@@ -2288,16 +2288,22 @@
 .append(
+other.
 distance
@@ -2314,22 +2314,16 @@
 Middle, 
-other.
 distance
@@ -2333,16 +2333,30 @@
 mMiddle)
+ // Decreasing
 %0A       

fix QueenDifficultyWeightFactory