package com.example.test.spring.multilevel;

import java.util.Random;

import com.example.test.spring.MessageBean;
import com.vaadin.flow.component.orderedlayout.VerticalLayout;
import com.vaadin.flow.component.textfield.TextField;
import com.vaadin.flow.data.binder.Binder;
import com.vaadin.flow.router.Route;
import org.springframework.beans.factory.annotation.Autowired;

@Route
public class MainView extends VerticalLayout {

    private TextField typeField = new TextField();

    public MainView(@Autowired MessageBean bean) {
        add(typeField);

        Binder<? extends ParentDTO> binder;

        if (new Random().nextInt(2) == 0) {
            ChildDTO child = new ChildDTO();
            binder = createChildBinder(child);
        } else {
            ChildTwoDTO child = new ChildTwoDTO();
            binder = createChildBinder(child);
        }
    }

    public Binder<ChildDTO> createChildBinder(ChildDTO bean) {
        Binder<ChildDTO> binder = createBinder(bean);
        TextField titleField = new TextField();
        add(titleField);
        binder.forField(titleField).asRequired()
                .bind(ChildDTO::getTitle, ChildDTO::setTitle);
        binder.readBean(bean);
        return binder;
    }

    public Binder<ChildTwoDTO> createChildBinder(ChildTwoDTO bean) {
        Binder<ChildTwoDTO> binder = createBinder(bean);
        TextField languageField = new TextField();
        add(languageField);
        binder.forField(languageField).asRequired()
                .bind(ChildTwoDTO::getLanguage, ChildTwoDTO::setLanguage);
        binder.readBean(bean);
        return binder;
    }

    public <T extends ParentDTO> Binder<T> createBinder(T bean) {
        Binder<T> binder = new Binder<>();
        binder.forField(typeField).asRequired("Better fill this...")
                .bind(ParentDTO::getType, ParentDTO::setType);
        return binder;
    }

    public static abstract class ParentDTO {
        private String type = "type";

        public String getType() {
            return type;
        }

        public void setType(String type) {
            this.type = type;
        }
    }

    public static class ChildDTO extends ParentDTO {
        private String title = "title";

        public String getTitle() {
            return title;
        }

        public void setTitle(String title) {
            this.title = title;
        }
    }

    public static class ChildTwoDTO extends ParentDTO {
        private String language = "language";

        public String getLanguage() {
            return language;
        }

        public void setLanguage(String language) {
            this.language = language;
        }
    }
}