package org.checkerframework.framework.util;

import java.util.Collection;
import java.util.Map;
import java.util.Set;
import javax.lang.model.element.AnnotationMirror;
import org.checkerframework.framework.type.QualifierHierarchy;
import org.checkerframework.javacutil.AnnotationUtils;
import org.checkerframework.javacutil.BugInCF;

/**
 * Represents the type qualifier hierarchy of a type system.
 *
 * <p>This class is immutable and can be only created through {@link
 * MultiGraphQualifierHierarchy.MultiGraphFactory}.
 *
 * @deprecated See notes in {@link MultiGraphQualifierHierarchy} about how to convert existing
 *     subclasses to the new classes.
 */
@Deprecated // 2020-09-10
public class GraphQualifierHierarchy extends MultiGraphQualifierHierarchy {

  public GraphQualifierHierarchy(MultiGraphFactory f, AnnotationMirror bottom) {
    super(f, bottom);
    // this.bottom = bottom;
  }

  // private final AnnotationMirror bottom;

  @Override
  protected void finish(
      QualifierHierarchy qualHierarchy,
      Map<AnnotationMirror, Set<AnnotationMirror>> fullMap,
      Map<AnnotationMirror, AnnotationMirror> polyQualifiers,
      Set<AnnotationMirror> tops,
      Set<AnnotationMirror> bottoms,
      Object... args) {
    // Careful, when this method is called, a field this.bottom would not be set yet.
    if (args != null && args[0] != null) {
      AnnotationMirror thebottom = (AnnotationMirror) args[0];
      // A special bottom qualifier was provided; go through the existing
      // bottom qualifiers and tie them all to this bottom qualifier.
      // Set<AnnotationMirror> bottoms = findBottoms(supertypes);
      Set<AnnotationMirror> allQuals = AnnotationUtils.createAnnotationSet();
      allQuals.addAll(fullMap.keySet());
      allQuals.remove(thebottom);
      AnnotationUtils.updateMappingToImmutableSet(fullMap, thebottom, allQuals);
      // thebottom is initially a top qualifier
      tops.remove(thebottom);
      // thebottom is now the single bottom qualifier
      bottoms.clear();
      bottoms.add(thebottom);
    }
  }

  /**
   * Returns the top qualifiers for this hierarchy. Returns multiple values for a compound checker
   * (such as the Nullness Checker).
   *
   * <p>The top qualifier is inferred from the hierarchy, as being the only one without any super
   * qualifiers
   */
  @Override
  public Set<? extends AnnotationMirror> getTopAnnotations() {
    if (tops.size() != 1) {
      throw new BugInCF(
          "Expected 1 possible top qualifier, found "
              + tops.size()
              + " (does the checker know about all type qualifiers?): "
              + tops);
    }
    return this.tops;
  }

  @Override
  public Set<? extends AnnotationMirror> getBottomAnnotations() {
    // TODO: checks?
    return this.bottoms;
  }

  @Override
  public boolean isSubtype(
      Collection<? extends AnnotationMirror> rhs, Collection<? extends AnnotationMirror> lhs) {
    if (lhs.isEmpty() || rhs.isEmpty()) {
      throw new BugInCF(
          "GraphQualifierHierarchy: Empty annotations in lhs: " + lhs + " or rhs: " + rhs);
    }
    if (lhs.size() > 1) {
      throw new BugInCF(
          "GraphQualifierHierarchy: Type with more than one annotation found: " + lhs);
    }
    if (rhs.size() > 1) {
      throw new BugInCF(
          "GraphQualifierHierarchy: Type with more than one annotation found: " + rhs);
    }
    for (AnnotationMirror lhsAnno : lhs) {
      for (AnnotationMirror rhsAnno : rhs) {
        if (isSubtype(rhsAnno, lhsAnno)) {
          return true;
        }
      }
    }
    return false;
  }
}