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/*
 * #%L
 * anwiba commons core
 * %%
 * Copyright (C) 2007 - 2016 Andreas Bartels
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 2.1 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

package net.anwiba.commons.reflection;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import net.anwiba.commons.reflection.utilities.IValueHolder;
import net.anwiba.commons.reflection.utilities.ListValueHolder;
import net.anwiba.commons.reflection.utilities.SingleValueHolder;

public final class ReflectionValueProvider implements IReflectionValueProvider {

  @SuppressWarnings("rawtypes")
  private final Map services;
  @SuppressWarnings("rawtypes")
  private final Map links;
  private final IReflectionValueProvider valueProvider;

  public ReflectionValueProvider(
      final IReflectionValueProvider valueProvider,
      @SuppressWarnings("rawtypes") final Map services,
      @SuppressWarnings("rawtypes") final Map links) {
    this.valueProvider = valueProvider;
    this.services = services;
    this.links = links;
  }

  @SuppressWarnings("unchecked")
  @Override
  public  Collection getAll(final Class componentType) {
    if (this.links.containsKey(componentType)) {
      return getAll(this.links.get(componentType));
    }
    final IValueHolder holder = this.services.get(componentType);
    if (holder == null) {
      return this.valueProvider.getAll(componentType);
    }
    if (holder instanceof SingleValueHolder) {
      final Object value = ((SingleValueHolder) holder).getValue();
      final ArrayList values = new ArrayList<>(Arrays.asList((T) value));
      values.addAll(this.valueProvider.getAll(componentType));
      return values;
    }
    if (holder instanceof ListValueHolder) {
      List values = ((ListValueHolder) holder).getValue().stream().map(v -> (T) v).collect(Collectors.toList());
      values.addAll(this.valueProvider.getAll(componentType));
      return values;
    }
    throw new IllegalStateException();
  }

  @SuppressWarnings("unchecked")
  @Override
  public  T get(final Class componentType) {
    if (this.links.containsKey(componentType)) {
      final Object object = get(this.links.get(componentType));
      return (T) object;
    }
    if (!this.services.containsKey(componentType)) {
      return this.valueProvider.get(componentType);
    }
    final IValueHolder holder = this.services.get(componentType);
    if (holder == null) {
      return null;
    }
    if (holder instanceof SingleValueHolder) {
      final Object value = ((SingleValueHolder) holder).getValue();
      return (T) value;
    }
    throw new IllegalStateException();
  }

  @Override
  public boolean contains(final Class clazz) {
    if (this.links.containsKey(clazz)) {
      final Class link = this.links.get(clazz);
      return this.services.containsKey(link) || this.valueProvider.contains(link);
    }
    return this.services.containsKey(clazz) || this.valueProvider.contains(clazz);
  }
}