// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
// All rights reserved.
//
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// modification, are permitted provided that the following conditions
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//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
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//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
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package io.ebean.enhance.asm.commons;

import io.ebean.enhance.asm.Opcodes;
import io.ebean.enhance.asm.signature.SignatureVisitor;

import java.util.ArrayList;

/**
 * A {@link SignatureVisitor} that remaps types with a {@link Remapper}.
 *
 * @author Eugene Kuleshov
 */
public class SignatureRemapper extends SignatureVisitor {

  private final SignatureVisitor signatureVisitor;

  private final Remapper remapper;

  private ArrayList<String> classNames = new ArrayList<>();

  /**
   * Constructs a new {@link SignatureRemapper}. <i>Subclasses must not use this constructor</i>.
   * Instead, they must use the {@link #SignatureRemapper(int, SignatureVisitor,Remapper)} version.
   *
   * @param signatureVisitor the signature visitor this remapper must deleted to.
   * @param remapper the remapper to use to remap the types in the visited signature.
   */
  public SignatureRemapper(final SignatureVisitor signatureVisitor, final Remapper remapper) {
    this(Opcodes.ASM7, signatureVisitor, remapper);
  }

  /**
   * Constructs a new {@link SignatureRemapper}.
   *
   * @param api the ASM API version supported by this remapper. Must be one of {@link
   *     Opcodes#ASM4}, {@link Opcodes#ASM5} or {@link
   *     Opcodes#ASM6}.
   * @param signatureVisitor the signature visitor this remapper must deleted to.
   * @param remapper the remapper to use to remap the types in the visited signature.
   */
  protected SignatureRemapper(
    final int api, final SignatureVisitor signatureVisitor, final Remapper remapper) {
    super(api);
    this.signatureVisitor = signatureVisitor;
    this.remapper = remapper;
  }

  @Override
  public void visitClassType(final String name) {
    classNames.add(name);
    signatureVisitor.visitClassType(remapper.mapType(name));
  }

  @Override
  public void visitInnerClassType(final String name) {
    String outerClassName = classNames.remove(classNames.size() - 1);
    String className = outerClassName + '$' + name;
    classNames.add(className);
    String remappedOuter = remapper.mapType(outerClassName) + '$';
    String remappedName = remapper.mapType(className);
    int index =
        remappedName.startsWith(remappedOuter)
            ? remappedOuter.length()
            : remappedName.lastIndexOf('$') + 1;
    signatureVisitor.visitInnerClassType(remappedName.substring(index));
  }

  @Override
  public void visitFormalTypeParameter(final String name) {
    signatureVisitor.visitFormalTypeParameter(name);
  }

  @Override
  public void visitTypeVariable(final String name) {
    signatureVisitor.visitTypeVariable(name);
  }

  @Override
  public SignatureVisitor visitArrayType() {
    signatureVisitor.visitArrayType();
    return this;
  }

  @Override
  public void visitBaseType(final char descriptor) {
    signatureVisitor.visitBaseType(descriptor);
  }

  @Override
  public SignatureVisitor visitClassBound() {
    signatureVisitor.visitClassBound();
    return this;
  }

  @Override
  public SignatureVisitor visitExceptionType() {
    signatureVisitor.visitExceptionType();
    return this;
  }

  @Override
  public SignatureVisitor visitInterface() {
    signatureVisitor.visitInterface();
    return this;
  }

  @Override
  public SignatureVisitor visitInterfaceBound() {
    signatureVisitor.visitInterfaceBound();
    return this;
  }

  @Override
  public SignatureVisitor visitParameterType() {
    signatureVisitor.visitParameterType();
    return this;
  }

  @Override
  public SignatureVisitor visitReturnType() {
    signatureVisitor.visitReturnType();
    return this;
  }

  @Override
  public SignatureVisitor visitSuperclass() {
    signatureVisitor.visitSuperclass();
    return this;
  }

  @Override
  public void visitTypeArgument() {
    signatureVisitor.visitTypeArgument();
  }

  @Override
  public SignatureVisitor visitTypeArgument(final char wildcard) {
    signatureVisitor.visitTypeArgument(wildcard);
    return this;
  }

  @Override
  public void visitEnd() {
    signatureVisitor.visitEnd();
    classNames.remove(classNames.size() - 1);
  }
}