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/*
 * Original Author -> Harry Yang ([email protected]) https://taketoday.cn
 * Copyright © TODAY & 2017 - 2022 All Rights Reserved.
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see [http://www.gnu.org/licenses/]
 */
package cn.taketoday.bytecode.proxy;

import java.lang.reflect.Modifier;
import java.util.List;

import cn.taketoday.bytecode.Type;
import cn.taketoday.bytecode.core.ClassEmitter;
import cn.taketoday.bytecode.core.CodeEmitter;
import cn.taketoday.bytecode.core.MethodInfo;
import cn.taketoday.bytecode.commons.MethodSignature;

/**
 * @author TODAY 

 * 2018-11-08 15:09
 */
final class DispatcherGenerator implements CallbackGenerator {

  public static final DispatcherGenerator INSTANCE = new DispatcherGenerator(false);
  public static final DispatcherGenerator PROXY_REF_INSTANCE = new DispatcherGenerator(true);

  private static final Type DISPATCHER = Type.fromClass(Dispatcher.class);
  private static final Type PROXY_REF_DISPATCHER = Type.fromClass(ProxyRefDispatcher.class);
  private static final MethodSignature LOAD_OBJECT = MethodSignature.from("Object loadObject()");
  private static final MethodSignature PROXY_REF_LOAD_OBJECT = MethodSignature.from("Object loadObject(Object)");

  private final boolean proxyRef;

  private DispatcherGenerator(boolean proxyRef) {
    this.proxyRef = proxyRef;
  }

  @Override
  public void generate(ClassEmitter ce, Context context, List methods) {
    for (final MethodInfo method : methods) {
      if (!Modifier.isProtected(method.getModifiers())) {
        final CodeEmitter e = context.beginMethod(ce, method);
        context.emitCallback(e, context.getIndex(method));
        if (proxyRef) {
          e.loadThis();
          e.invokeInterface(PROXY_REF_DISPATCHER, PROXY_REF_LOAD_OBJECT);
        }
        else {
          e.invokeInterface(DISPATCHER, LOAD_OBJECT);
        }
        e.checkCast(method.getClassInfo().getType());
        e.loadArgs();
        e.invoke(method);
        e.returnValue();
        e.end_method();
      }
    }
  }

  @Override
  public void generateStatic(CodeEmitter e, Context context, List methods) throws Exception {

  }

}