package app.navigation.components.button;

import app.data.entity.Matchday;
import app.navigation.Navigation;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.icon.Icon;
import com.vaadin.flow.component.icon.VaadinIcon;

import java.util.Optional;

public class PrevMatchdayButton extends Button {

    private final Navigation navigation;

    public PrevMatchdayButton(Navigation navigation) {
        this.navigation = navigation;

        if (!navigation.isMatchdayEnabled())
            throw new IllegalStateException("Cannot instantiate PrevMatchdayButton when Matchdays are not enabled!");

        setIcon(new Icon(VaadinIcon.ARROW_LEFT));

        navigation.addRunnableToBeRunAfterSelection(this::configure);
    }

    private void configure() {
        Optional<Matchday> prevMatchday = getPrevMatchday();
        setEnabled(prevMatchday.isPresent());
        addClickListener(event -> prevMatchday.ifPresent(matchday -> navigation.getMatchdaySelect().setValue(matchday)));
    }

    private Optional<Matchday> getPrevMatchday() {
        int index = ButtonUtils.getMatchdayIndex(navigation);
        if (index > 0) return Optional.ofNullable(navigation.getMatchdayList().get(index - 1));
        return Optional.empty();
    }
}