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/*
 * Copyright 2010 Henry Coles
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and limitations under the License.
 */
package org.pitest.classinfo;

import java.math.BigInteger;
import java.util.Optional;

/**
 * Captures information about a class, its position within a hierarchy. Changes to
 * a class between runs are tracked by calculating the hash of its bytecode and the
 * bytecode of classes it has a strong relationship to.
 */
public final class ClassInfo implements ClassHash {

  private final ClassIdentifier        id;
  private final ClassPointer           outerClass;
  private final ClassPointer           superClass;

  public ClassInfo(ClassPointer superClass, ClassPointer outerClass, ClassInfoBuilder builder) {
    this(superClass, outerClass, builder.id);
  }

  public ClassInfo(ClassPointer superClass, ClassPointer outerClass, ClassIdentifier id) {
    this.superClass = superClass;
    this.outerClass = outerClass;
    this.id = id;
  }

  public ClassIdentifier getId() {
    return this.id;
  }

  public ClassName getName() {
    return this.id.getName();
  }

  public Optional getOuterClass() {
    return this.outerClass.fetch();
  }

  public Optional getSuperClass() {
    return getParent();
  }

  public boolean descendsFrom(final Class clazz) {
    return descendsFrom(ClassName.fromClass(clazz));
  }

  public HierarchicalClassId getHierarchicalId() {
    return new HierarchicalClassId(this.id, getDeepHash());
  }

  public BigInteger getDeepHash() {
    BigInteger hash = getHash();
    final Optional parent = getParent();
    if (parent.isPresent()) {
      hash = hash.add(parent.get().getHash());
    }
    final Optional outer = getOuterClass();
    if (outer.isPresent()) {
      hash = hash.add(outer.get().getHash());
    }
    return hash;
  }

  public BigInteger getHash() {
    return BigInteger.valueOf(this.id.getHash());
  }

  private Optional getParent() {
    if (this.superClass == null) {
      return Optional.empty();
    }
    return this.superClass.fetch();
  }

  private boolean descendsFrom(final ClassName clazz) {

    if (!this.getSuperClass().isPresent()) {
      return false;
    }

    if (this.getSuperClass().get().getName().equals(clazz)) {
      return true;
    }

    return getSuperClass().get().descendsFrom(clazz);
  }

  @Override
  public String toString() {
    return this.id.getName().asJavaName();
  }

}