package ru.Makivay.sandbox.slaviksShittyTasks;


import com.google.common.base.Strings;
import com.google.common.collect.Lists;
import sun.reflect.generics.reflectiveObjects.NotImplementedException;

import javax.annotation.Nonnull;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;

/**
 * Created by makivay
 * on 13.12.17
 */
public class Example {

    private final static String WORDS_SPLITTER = " ";
    private final static String LINES_SPLITTER = System.lineSeparator();


    private static long splitAndCount(final @Nonnull String source, final String splitter, final boolean includeEmptyStrings) {
        return Arrays
                .stream(source.split("(?<=" + splitter + ")"))
                .map(s -> s.replace(splitter, ""))
                .filter(s -> includeEmptyStrings || !Strings.isNullOrEmpty(s))
                .count();
    }

    private static long count(final String source, final Target target) {
        final long count;
        if (Strings.isNullOrEmpty(source)) {
            count = 0;
        } else if (Objects.equals(Target.CHARS, target)) {
            count = source.length();
        } else if (Objects.equals(Target.WORDS, target)) {
            count = splitAndCount(source, WORDS_SPLITTER, false);
        } else if (Objects.equals(Target.LINES, target)) {
            count = splitAndCount(source, LINES_SPLITTER, true);
        } else {
            throw new NotImplementedException();
        }
        return count;
    }

    public static void main(String[] args) {
        final List<String> examples = Lists.newArrayList("", "aa", "aaa aaa", "    ", "a\na", "\n\n\n", null);
        for (Target target : Target.values()) {
            System.out.println(target);
            for (String example : examples) {
                System.out.println(count(example, target));
            }
        }
    }

    enum Target {
        CHARS, WORDS, LINES
    }
}