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package fi.evolver.ai.vaadin.view;

import java.io.Serial;
import java.util.List;

import org.vaadin.lineawesome.LineAwesomeIcon;

import com.vaadin.flow.component.Component;
import com.vaadin.flow.component.applayout.AppLayout;
import com.vaadin.flow.component.applayout.DrawerToggle;
import com.vaadin.flow.component.html.H2;
import com.vaadin.flow.component.html.Header;
import com.vaadin.flow.component.html.Image;
import com.vaadin.flow.component.html.Span;
import com.vaadin.flow.component.orderedlayout.Scroller;
import com.vaadin.flow.component.orderedlayout.VerticalLayout;
import com.vaadin.flow.component.sidenav.SideNav;
import com.vaadin.flow.component.sidenav.SideNavItem;
import com.vaadin.flow.router.HasDynamicTitle;
import com.vaadin.flow.router.PageTitle;
import com.vaadin.flow.theme.lumo.LumoUtility;

import fi.evolver.ai.vaadin.VersionInfoConfigurator;
import fi.evolver.ai.vaadin.translations.PageTitleTranslationKey;
import fi.evolver.ai.vaadin.util.AuthUtils;
import fi.evolver.utils.string.StringUtils;

public abstract class BaseLayout extends AppLayout implements HasDynamicTitle {

	@Serial
	private static final long serialVersionUID = 1L;

	protected H2 viewTitle = new H2();

	public BaseLayout() {
		viewTitle.addClassNames(LumoUtility.FontSize.LARGE, LumoUtility.Margin.NONE);
		viewTitle.setMaxWidth("50%");
		setPrimarySection(Section.DRAWER);

		addDrawerContent();
		addHeaderContent();
	}

	public abstract Image createHeaderImage();

	public List createNavRoutes() {
		return List.of();
	}

	public List createNavSections() {
		return List.of();
	}

	public boolean generateDefaultProfileRoute() {
		return true;
	}

	public boolean generateDefaultAdminRoute() {
		return true;
	}

	public boolean displayAppVersion() {
		return true;
	}

	private void addDrawerContent() {
		addToDrawer(new Header(createHeaderImage()), new Scroller(createNavigation()));
		if (displayAppVersion())
			addToDrawer(createVersionInfoContent(VersionInfoConfigurator.appVersion));
	}

	private VerticalLayout createVersionInfoContent(String appVersion) {
		VerticalLayout layout = new VerticalLayout();
		layout.setMargin(true);
		layout.setWidth("90%");
		Span versionSpan = new Span(appVersion);
		versionSpan.getStyle().set("font-style", "italic");
		layout.add(versionSpan);

		return layout;
	}

	private VerticalLayout createNavigation() {
		VerticalLayout layout = new VerticalLayout();
		layout.setSpacing(true);
		layout.setSizeUndefined();

		createNavSections().forEach(nav -> {
			nav.setWidthFull();
			layout.add(nav);
		});

		if (!createNavRoutes().isEmpty() || generateDefaultProfileRoute()) {
			SideNav sideNav = new SideNav();
			sideNav.setWidthFull();
			createNavRoutes().forEach(sideNav::addItem);
			if (generateDefaultProfileRoute())
				sideNav.addItem(
						new SideNavItem(getTranslation("nav.profile"), "profile", LineAwesomeIcon.USER.create()));

			layout.add(sideNav);
		}

		if (AuthUtils.isAdminUser() && generateDefaultAdminRoute()) {
			SideNav adminNav = new SideNav("Admin");
			adminNav.setCollapsible(true);
			adminNav.setExpanded(true);
			adminNav.addItem(
					new SideNavItem(getTranslation("nav.admin"), "admin", LineAwesomeIcon.USER_SHIELD_SOLID.create()));
			adminNav.setWidthFull();
			layout.add(adminNav);
		}

		return layout;
	}

	private void addHeaderContent() {
		DrawerToggle toggle = new DrawerToggle();
		toggle.getElement().setAttribute("aria-label", getTranslation("view.baseLayout.menuToggle"));

		addToNavbar(false, toggle, viewTitle);
	}

	@Override
	protected void afterNavigation() {
		super.afterNavigation();
		viewTitle.setText(getCurrentPageTitle());
	}

	public void updateTitle(String title) {
		viewTitle.setText(title);
	}

	@Override
	public String getPageTitle() {
		return getCurrentPageTitle();
	}

	private String getCurrentPageTitle() {
		Component component = getContent();
		if (component instanceof HasDynamicTitle)
			return ((HasDynamicTitle) component).getPageTitle();

		PageTitleTranslationKey translationKey = component.getClass().getAnnotation(PageTitleTranslationKey.class);
		if (translationKey != null && StringUtils.hasText(translationKey.value()))
			return getTranslation(translationKey.value());

		PageTitle title = component.getClass().getAnnotation(PageTitle.class);
		if (title != null && StringUtils.hasText(title.value()))
			return title.value();

		return getTranslation("viewTitle.%s".formatted(component.getClass().getSimpleName()));
	}

}