Final state machine using copilot

CourseState.java

package course_duration.domain;

import java.time.Duration;
import java.time.Instant;
import java.time.temporal.ChronoUnit;

public abstract class CourseState {

    private static final Duration MAX_MINUTES_SHORT_COURSES = Duration.ofMinutes(10);

    private final String name;
    private final Configuration configuration;
    private final Clock clock;
    private final CourseView courseView;
    private final Duration durationInMinutes;

    protected CourseState(String name, Configuration configuration, Clock clock, CourseView courseView, Duration durationInMinutes) {
        this.name = name;
        this.configuration = configuration;
        this.clock = clock;
        this.courseView = courseView;
        this.durationInMinutes = durationInMinutes;
    }

    public void showDetails() {
        courseView.displayLine("Title: " + getTitle());
        courseView.displayLine("Duration: " + durationInMinutes.toMinutes() + " minutes");
        courseView.displayLine("Type: " + (isShort() ? "short" : "long"));
    }

    public abstract CourseState start();

    public abstract CourseState end();

    protected CourseState transitionToOnGoing() {
        return new OnGoingCourseState(name, clock.now(), clock, configuration, courseView);
    }

    protected CourseState transitionToFinished(Instant startTime) {
        var endTime = clock.now();
        var duration = Duration.ofMinutes(ChronoUnit.MINUTES.between(startTime, endTime));
        return new FinishedCourseState(name, duration, clock, configuration, courseView);
    }

    private boolean isShort() {
        return durationInMinutes.compareTo(MAX_MINUTES_SHORT_COURSES) < 0;
    }

    private String getTitle() {
        String college = configuration.getValue("COLLEGE");
        return name + " course in " + (college != null ? college : "not found") + " college";
    }
}

FinishedCourseState.java

package course_duration.domain;

import java.time.Duration;

public class FinishedCourseState extends CourseState {

    public FinishedCourseState(String name, Duration durationInMinutes, Clock clock, Configuration configuration, CourseView courseView) {
        super(name, configuration, clock, courseView, durationInMinutes);
    }

    @Override
    public CourseState start() {
        return this;
    }

    @Override
    public CourseState end() {
        return this;
    }
}

OnGoingCourseState.java

package course_duration.domain;

import java.time.Duration;
import java.time.Instant;

public class OnGoingCourseState extends CourseState {

    private final Instant startTime;

    public OnGoingCourseState(String name, Instant startTime, Clock clock, Configuration configuration, CourseView courseView) {
        super(name, configuration, clock, courseView, Duration.ZERO);
        this.startTime = startTime;
    }

    @Override
    public CourseState start() {
        return this;
    }

    @Override
    public CourseState end() {
        return transitionToFinished(startTime);
    }
}

YetToStartCourseState.java

package course_duration.domain;

import java.time.Duration;

public class YetToStartCourseState extends CourseState {

    public YetToStartCourseState(String name, Configuration configuration, Clock clock, CourseView courseView) {
        super(name, configuration, clock, courseView, Duration.ZERO);
    }

    @Override
    public CourseState start() {
        return transitionToOnGoing();
    }

    @Override
    public CourseState end() {
        return this;
    }
}