package de.ph87.homeautomation;

import jakarta.persistence.criteria.Expression;
import jakarta.persistence.criteria.Predicate;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.data.jpa.domain.Specification;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;

import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import java.util.function.Function;

public class RepositorySearchHelper {

  public static <T, D> List<D> search(final String term, final JpaSpecificationExecutor<T> repository, final String fieldName, final Function<T, D> map) {
    final Specification<T> specification = (root, query, criteriaBuilder) -> {
      final Expression<String> field = criteriaBuilder.lower(root.get(fieldName));
      final String term2 = term
          .replaceAll("([a-zA-Z])([0-9])", "$1 $2")
          .replaceAll("([0-9])([a-zA-Z])", "$1 $2")
          .replaceAll("([A-Z])([A-Z])", "$1 $2")
          .replaceAll("([a-z])([A-Z])", "$1 $2")
          .toLowerCase(Locale.ROOT);
      final List<Predicate> predicates = Arrays.stream(term2.split("\\s"))
          .filter(word -> !word.isEmpty())
          .map(word -> criteriaBuilder.like(field, "%" + word + "%"))
          .toList();
      return criteriaBuilder.and(predicates.toArray(Predicate[]::new));
    };
    final PageRequest pageRequest = PageRequest.of(0, 20, Sort.by(Sort.Direction.ASC, fieldName));
    return repository.findAll(specification, pageRequest).stream().map(map).toList();
  }

}