// Copyright 2000-2025 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.

package org.jetbrains.plugins.groovy.lang.psi.impl.javaView;

import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiElementFinder;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.psi.util.PsiClassUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.plugins.groovy.lang.psi.GroovyFileBase;
import org.jetbrains.plugins.groovy.lang.stubs.GroovyShortNamesCache;

import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class GroovyClassFinder extends PsiElementFinder {
  private final GroovyShortNamesCache myCache;

  public GroovyClassFinder(Project project) {
    myCache = GroovyShortNamesCache.getGroovyShortNamesCache(project);
  }

  @Override
  public @Nullable PsiClass findClass(@NotNull String qualifiedName, @NotNull GlobalSearchScope scope) {
    final List<PsiClass> classes = myCache.getClassesByFQName(qualifiedName, scope, true);
    if (classes.isEmpty()) return null;
    if (classes.size() == 1) return classes.get(0);
    return Collections.min(classes, PsiClassUtil.createScopeComparator(scope)
      .thenComparing(c -> c.getQualifiedName(), Comparator.nullsLast(Comparator.naturalOrder()))
      .thenComparing(c -> c.getContainingFile() instanceof GroovyFileBase groovyFile ? groovyFile.getPackageName() : "",
                     Comparator.reverseOrder()));
  }

  @Override
  public PsiClass @NotNull [] findClasses(@NotNull String qualifiedName, @NotNull GlobalSearchScope scope) {
    final Collection<PsiClass> classes = myCache.getClassesByFQName(qualifiedName, scope, true);
    return classes.isEmpty() ? PsiClass.EMPTY_ARRAY : classes.toArray(PsiClass.EMPTY_ARRAY);
  }
}
