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/*
 * Copyright 2015 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.rio.core.main;

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

import br.com.objectos.rio.annotations.RioMethod;

import br.com.objectos.way.core.util.WayIterable;
import br.com.objectos.way.core.util.WayIterables;

import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.Multimaps;

/**
 * @author [email protected] (Marcio Endo)
 */
public class RioMethodMap {

  private final ListMultimap nameMap;

  private RioMethodMap(ListMultimap nameMap) {
    this.nameMap = nameMap;
  }

  public static  RioMethodMap mapOf(Iterable> classes) {
    WayIterable> iterable = WayIterables.> from(classes);
    return mapOf(iterable);
  }

  public static RioMethodMap mapOf(Class... classes) {
    WayIterable> iterable = WayIterables.from(classes);
    return mapOf(iterable);
  }

  private static RioMethodMap mapOf(WayIterable> classIterable) {
    return classIterable
        .transformAndConcat(new ClassToMethodList())
        .filter(new MethodIsValid())
        .transform(new MethodToMethodWrapper())
        .asMap(new Function, RioMethodMap>() {
          @Override
          public RioMethodMap apply(List list) {
            ListMultimap nameMap = Multimaps.index(list, RioMethodWrapperGetName.get());
            return new RioMethodMap(nameMap);
          }
        });
  }

  public Optional get(String methodName, List argumentList) {
    Optional res = Optional.absent();

    List candidateList = nameMap.get(methodName);
    for (RioMethodWrapper candidate : candidateList) {
      if (candidate.matchesArgumentList(argumentList)) {
        res = candidate.unwrap();
        break;
      }
    }

    return res;
  }

  private static class ClassToMethodList implements Function, List> {
    @Override
    public List apply(Class input) {
      Method[] methods = input.getMethods();
      return ImmutableList.copyOf(methods);
    }
  }

  private static class MethodIsValid implements Predicate {
    @Override
    public boolean apply(Method input) {
      return input.isAnnotationPresent(RioMethod.class);
    }
  }

  private static class MethodToMethodWrapper implements Function {
    @Override
    public RioMethodWrapper apply(Method input) {
      return RioMethodWrapper.wrap(input);
    }
  }

}