SofutniCoursePlanning

package ListsExercise;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

public class SoftUniCoursePlanning {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        List<String> elements = Arrays.stream(reader.readLine().split(", "))
                .collect(Collectors.toList());

        String line = reader.readLine();

        while (!line.equals("course start")){

            String[] inputs = line.split(":");
            String cmd = inputs[0];

            if (cmd.equals("Add")){
                String lesson = inputs[1];
                if (elements.contains(lesson)){
                    break;
                } else {
                    elements.add(lesson);
                }
            } else if (cmd.equals("Insert")){
                String lesson = inputs[1];
                int index = Integer.parseInt(inputs[2]);
                if (elements.contains(lesson)){
                    break;
                } else {
                    elements.add(index,lesson);
                }
            } else if (cmd.equals("Remove")){
                String lesson = inputs[1];
                if (elements.contains(lesson)){
                    elements.remove(lesson);
                    elements.remove(lesson + "-Exercise");
                } else {
                    break;
                }
            } else if (cmd.equals("Swap")){
                String firstLesson = inputs[1];
                String secondLesson = inputs[2];
                int index1 = elements.indexOf(firstLesson);
                int index2 = elements.indexOf(secondLesson);
                if (elements.contains(firstLesson) && elements.contains(secondLesson)){
                    if (elements.contains(secondLesson + "-Exercise")){
                        elements.remove(secondLesson + "-Exercise");
                        elements.add(index1 + 1,secondLesson + "-Exercise");
                    }
                    elements.set(elements.indexOf(inputs[1]),inputs[2]);
                    if (elements.contains(firstLesson + "-Exercise")){
                        elements.remove(firstLesson + "-Exercise");
                        elements.add(index2 + 1, firstLesson + "-Exercise");
                    }
                    elements.set(elements.lastIndexOf(inputs[2]), inputs[1]);
                }

            } else if (cmd.equals("Exercise")){
                String lesson = inputs[1];
                if (elements.contains(lesson)){
                    int index = elements.indexOf(lesson);
                    elements.add(index + 1, lesson + "-Exercise");
                } else {
                    elements.add(lesson);
                    elements.add(lesson + "-Exercise");
                }

            }


            line = reader.readLine();
        }
        int index = 1;
        for (String element : elements) {
            System.out.println(index + "." + element);
            index++;
        }
    }
}