/*
 * Copyright (C) 2019-2022 LitterBox contributors
 *
 * This file is part of LitterBox.
 *
 * LitterBox is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 *
 * LitterBox 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with LitterBox. If not, see <http://www.gnu.org/licenses/>.
 */
package de.uni_passau.fim.se2.litterbox.analytics.metric;

import de.uni_passau.fim.se2.litterbox.analytics.MetricExtractor;
import de.uni_passau.fim.se2.litterbox.ast.model.ASTNode;
import de.uni_passau.fim.se2.litterbox.ast.model.Script;
import de.uni_passau.fim.se2.litterbox.ast.model.procedure.ProcedureDefinition;
import de.uni_passau.fim.se2.litterbox.ast.visitor.ScratchVisitor;
import de.uni_passau.fim.se2.litterbox.utils.Preconditions;

import java.util.ArrayList;

public class Cohesion<T extends ASTNode> implements MetricExtractor<T>, ScratchVisitor {
    public static final String NAME = "cohesion";

    private double count = 0;

    private double localCohesion = 0;

    @Override
    public double calculateMetric(T node) {
        Preconditions.checkNotNull(node);
        count = 0;
        node.accept(this);
        return count;
    }

    @Override
    public void visit(Script node) {
        ArrayList<MetricExtractor<Script>> list = new ArrayList<>();
        list.add(new EventsBlockCount<>()); //TODO if you doesnt want to count events as kind of blocks
                                            // add corner case for countDifferentBlocks == 0
        list.add(new SoundBlockCount<>());
        list.add(new MotionBlockCount<>());
        list.add(new LooksBlockCount<>());
        list.add(new ControlBlockCount<>());
        list.add(new SensingBlockCount<>());
        list.add(new VariablesBlockCount<>());
        list.add(new OperatorsBlockCount<>());

        int countDifferentBlocks = 0;

        for (MetricExtractor<Script> extractor : list) {
            double count = extractor.calculateMetric(node);
            if (count > 0)
                countDifferentBlocks++;
        }

        // Calculate local script cohesion
        localCohesion = countDifferentBlocks /  new BlockCount<Script>().calculateMetric(node); //TODO corner case here

        count += localCohesion;
    }

    @Override
    public void visit(ProcedureDefinition node) {
        ArrayList<MetricExtractor<ProcedureDefinition>> list = new ArrayList<>();
        list.add(new EventsBlockCount<>());
        list.add(new SoundBlockCount<>());
        list.add(new MotionBlockCount<>());
        list.add(new LooksBlockCount<>());
        list.add(new ControlBlockCount<>());
        list.add(new SensingBlockCount<>());
        list.add(new VariablesBlockCount<>());
        list.add(new OperatorsBlockCount<>());

        int countDifferentBlocks = 0;

        for (MetricExtractor<ProcedureDefinition> extractor : list) {
            double count = extractor.calculateMetric(node);
            if (count > 0)
                countDifferentBlocks++;
        }

        // Calculate local script cohesion
        localCohesion = countDifferentBlocks /  new BlockCount<ProcedureDefinition>().calculateMetric(node);

        count += localCohesion;

    }

    @Override
    public String getName() {
        return NAME;
    }
}
