package de.hsel.spm.baudas.analysis;

import weka.core.Instance;
import weka.core.Instances;

import java.io.File;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * get sum for every article and sort them ascending.
 *
 * @author Karsten Eden
 * @version 0.1
 * @since 0.1
 */


public class TopFlopArticle implements Analysis<Map<String, Integer>> {

    private Instances instances;
    private Map<String, Integer> results;

    public TopFlopArticle(File file) {

        instances = load(file);
    }

    /**
     * get result of analysis.
     *
     * @return Map of Name of Products and Sum of Values
     */
    public Map<String, Integer> getResult() {
        if (results != null) {
            return results;
        }
        results = new HashMap<>();
        String name;
        double sum = 0.0;
        for (int i = 11; i <= 25; i++) {
            for (Instance instance : instances) {
                sum += instance.value(i);
            }
            name = instances.attribute(i).name();
            results.put(name, (int) sum);
            sum = 0.0;
        }
        //Sort Map in ascending order
        Stream<Map.Entry<String, Integer>> sorted = results.entrySet().stream().sorted(Map.Entry.comparingByValue());
        results = sorted.collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue, (e1, e2) -> e2, LinkedHashMap::new));
        return results;
    }

}