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/*
 * Copyright 2014 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.way.base.log;

import static com.google.common.collect.Lists.newArrayListWithCapacity;
import static com.google.common.collect.Lists.transform;

import java.util.ArrayList;
import java.util.List;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

import com.google.common.base.Stopwatch;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.inject.Provider;

/**
 * @author [email protected] (Marcio Endo)
 */
public abstract class AbstractMethodLogger implements MethodInterceptor {

  private final Provider processors;

  public AbstractMethodLogger(Provider processors) {
    this.processors = processors;
  }

  @Override
  public final Object invoke(MethodInvocation invocation) throws Throwable {
    return new Invoker(invocation).invoke();
  }

  protected void onInvoke(OnInvoke onInvoke) {
    onInvoke.debug()
        .addClassName()
        .add(".")
        .addMethodName()
        .add("() :>> ")
        .addArgs();
  }

  protected void onReturn(OnReturn onReturn) {
  }

  protected void onThrowable(OnThrowable onThrowable) {
    onThrowable.error()
        .addClassName()
        .add(".")
        .addMethodName()
        .add("() :threw an exception")
        .addStrackTrace();
  }

  private void onEnd(OnEnd onEnd) {
    onEnd.debug()
        .addClassName()
        .add(".")
        .addMethodName()
        .add("() :<< in ")
        .addStopwatch();
  }

  private class Invoker {

    private final MethodInvocation invocation;
    private final Stopwatch stopwatch;
    private final ArrayList phases;

    public Invoker(MethodInvocation invocation) {
      this.invocation = invocation;
      stopwatch = Stopwatch.createStarted();
      phases = newArrayListWithCapacity(3);
    }

    public Object invoke() throws Throwable {
      try {
        return tryToInvoke();

      } catch (Throwable t) {
        throw processAndRethrow(t);

      } finally {
        try {
          OnEnd onEnd = new OnEnd(invocation, stopwatch);
          phases.add(onEnd);
          onEnd(onEnd);

        } finally {
          process();

        }
      }
    }

    private Object tryToInvoke() throws Throwable {
      OnInvoke onInvoke = new OnInvoke(invocation);
      phases.add(onInvoke);
      onInvoke(onInvoke);

      Object returned = invocation.proceed();
      OnReturn onReturn = new OnReturn(invocation, returned);
      phases.add(onReturn);
      onReturn(onReturn);
      return returned;
    }

    private Throwable processAndRethrow(Throwable t) {
      OnThrowable onThrowable = new OnThrowable(invocation, t);
      phases.add(onThrowable);
      onThrowable(onThrowable);
      return t;
    }

    private void process() {
      LogProcessor processor;
      processor = processors.get();

      List>> listzes;
      listzes = transform(phases, AbstractPhase.TO_LOG_BUILDER);

      Iterable> builders;
      builders = Iterables.concat(listzes);

      Iterable _logs;
      _logs = Iterables.transform(builders, LogBuilder.TO_LOG);

      List logs;
      logs = ImmutableList.copyOf(_logs);

      for (Log log : logs) {
        processor.process(log);
      }
    }

  }

}