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package lamps.utils;

import csip.Config;
import java.util.ArrayList;
import java.util.List;

/**
 *
 * @author od
 */
public class Partition {

    public static int getThreadCount(int size) {
        if (Config.hasProperty("csip.lamps.threads")) {
            return Config.getInt("csip.lamps.threads");
        }
        int threadnr = 1;
        //if (size > 30) {
        //    threadnr = Runtime.getRuntime().availableProcessors() + 1;
        //} else 
        if (size < 6) {
            threadnr = 1;
        } else {
            threadnr = 2;
        }
        return threadnr;
    }

    public static <T> List<List<T>> chopIntoParts(final List<T> ls, final int iParts) {
        final List<List<T>> lsParts = new ArrayList<>();
        final int iChunkSize = ls.size() / iParts;
        int iLeftOver = ls.size() % iParts;
        int iTake = iChunkSize;
        for (int i = 0, iT = ls.size(); i < iT; i += iTake) {
            if (iLeftOver > 0) {
                iLeftOver--;
                iTake = iChunkSize + 1;
            } else {
                iTake = iChunkSize;
            }
            lsParts.add(new ArrayList<>(ls.subList(i, Math.min(iT, i + iTake))));
        }
        return lsParts;
    }

}