erp-imprimelibros/src/main/java/com/imprimelibros/erp/paises/PaisesService.java

package com.imprimelibros.erp.paises;

import java.text.Collator;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collectors;

import org.springframework.context.MessageSource;
import org.springframework.stereotype.Service;

@Service
public class PaisesService {

    protected final PaisesRepository repo;
    protected final MessageSource messageSource;

    public PaisesService(PaisesRepository repo, MessageSource messageSource) {
        this.repo = repo;
        this.messageSource = messageSource;
    }

    public Map<String, Object> getForSelect(String q1, String q2, Locale locale) {

        try {

            // Termino de búsqueda (Select2 usa 'q' o 'term' según versión/config)
            String search = Optional.ofNullable(q1).orElse(q2);
            if (search != null) {
                search = search.trim();
            }
            final String q = (search == null || search.isEmpty())
                    ? null
                    : search.toLowerCase(locale);

            List<Paises> all = repo.findAll();

            // Mapear a opciones id/text con i18n y filtrar por búsqueda si llega
            List<Map<String, String>> options = all.stream()
                    .map(cc -> {
                        String key = cc.getKeyword();
                        String id = cc.getCode3();
                        String text = messageSource.getMessage("paises." + key, null, key, locale);
                        Map<String, String> m = new HashMap<>();
                        m.put("id", id); // lo normal en Select2: id = valor que guardarás (code3)
                        m.put("text", text); // texto mostrado, i18n con fallback a keyword
                        return m;
                    })
                    .filter(opt -> {
                        if (q == null || q.isEmpty())
                            return true;
                        String text = opt.get("text").toLowerCase(locale);
                        String id = opt.get("id").toLowerCase(locale);
                        return text.contains(q) || id.contains(q);
                    })
                    .sorted(Comparator.comparing(m -> m.get("text"), Collator.getInstance(locale)))
                    .collect(Collectors.toList());

            // Estructura Select2
            Map<String, Object> resp = new HashMap<>();
            resp.put("results", options);
            return resp;
        } catch (Exception e) {
            e.printStackTrace();
            return Map.of("results", List.of());
        }
    }

    public String getPaisNombrePorCode3(String code3, Locale locale) {
        if (code3 == null || code3.isEmpty()) {
            return "";
        }
        Optional<Paises> opt = repo.findByCode3(code3);
        if (opt.isPresent()) {
            Paises pais = opt.get();
            String key = pais.getKeyword();
            return messageSource.getMessage("paises." + key, null, key, locale);
        } else {
            return "";
        }
    }

}