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package fi.evolver.ai.vaadin.translations;

import java.io.Serial;
import java.util.Locale;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import com.vaadin.flow.i18n.I18NProvider;
import com.vaadin.flow.server.UIInitEvent;
import com.vaadin.flow.server.UIInitListener;
import com.vaadin.flow.server.VaadinService;

import fi.evolver.ai.vaadin.UserProfileService;
import fi.evolver.ai.vaadin.entity.UserProfile;
import fi.evolver.utils.string.StringUtils;

@Component
public class SessionLocaleConfigurator implements UIInitListener {
	@Serial
	private static final long serialVersionUID = 1L;

	private static final Logger LOG = LoggerFactory.getLogger(SessionLocaleConfigurator.class);

	@Value("${vaadin.default-language:AUTO}")
	private String defaultLanguageCode;

	@Autowired
	private I18NProvider i18nProvider;

	@Autowired
	private UserProfileService userProfileService;

	@Override
	public void uiInit(UIInitEvent event) {
		LOG.trace("Initializing UI");
		String langCode = defaultLanguageCode;

		// Check if a user is logged in and has a language set
		UserProfile user = userProfileService.fetchUserProfile();
		if (user != null && StringUtils.hasText(user.getLanguage()))
			langCode = user.getLanguage();

		Locale locale = null;
		if ("AUTO".equals(langCode)) {
			LOG.trace("Trying to get requested locale");
			try {
				// Try to get the Accept-Language header
				locale = VaadinService.getCurrentRequest().getLocale();
				LOG.trace("Got {} from request", locale.toString());
				if (!isLocaleSupported(locale))
					locale = null; // Don't use unsupported languages
			}
			catch (Exception e) {
				locale = null;
			}
			if (locale == null) {
				LOG.trace("Trying to get browser locale");
				try {
					// Try to get the browser locale
					locale = event.getUI().getSession().getBrowser().getLocale();
					LOG.trace("Got {} from browser", locale.toString());
					if (!isLocaleSupported(locale))
						locale = null;
				}
				catch (Exception e) {
					locale = null;
				}
			}
		}
		else {
			try {
				locale = Locale.forLanguageTag(langCode);
				if (!isLocaleSupported(locale))
					locale = null;
			}
			catch (Exception e) {
				locale = null;
			}
		}
		if (locale == null) {
			LOG.trace("Defaulting to english");
			locale = Locale.ENGLISH;
		}
		LOG.debug("Setting UI locale to {}", locale.toString());
		event.getUI().setLocale(locale);
	}

	private boolean isLocaleSupported(final Locale locale) {
		return locale != null
			&& i18nProvider != null
			&& i18nProvider.getProvidedLocales()
				.stream()
				.anyMatch(l -> locale.getLanguage().equals(l.getLanguage()));
	}
}