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/*
 * Copyright 2011 the original author or authors.
 *
 * 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 net.projectmonkey.internal;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import net.projectmonkey.TypeMap;
import net.projectmonkey.Provider.ProvisionRequest;
import net.projectmonkey.internal.util.Assert;
import net.projectmonkey.internal.util.Types;
import net.projectmonkey.spi.Mapping;
import net.projectmonkey.spi.MappingContext;
import net.projectmonkey.spi.MappingEngine;


/**
 * MappingContext implementation that caches destination values by their corresponding Mutator.
 * 
 * @author Jonathan Halterman
 */
public class MappingContextImpl implements MappingContext, ProvisionRequest {
  final Map destinationCache;
  final Errors errors;
  private final Set> currentlyMapping;
  private D destination;
  private final Class destinationType;
  private Mapping mapping;
  private final MappingEngine mappingEngine;
  private final S source;
  private Object parentSource;
  private final Class sourceType;
  private TypeMap typeMap;
  /** Tracks destination hierarchy paths that were shaded by a condition */
  private final List shadedPaths;

  /**
   * Create initial MappingContext.
   */
  public MappingContextImpl(final S source, final Class sourceType, final D destination, final Class destinationType,
      final MappingEngine mappingEngine) {
    this.source = source;
    this.sourceType = sourceType;
    this.destination = destination;
    this.destinationType = destinationType;
    this.mappingEngine = mappingEngine;
    currentlyMapping = new HashSet>();
    errors = new Errors();
    destinationCache = new HashMap();
    shadedPaths = new ArrayList();
  }

  /**
   * Create child MappingContext. The mapping is no longer mapped to S and D in this scope.
   */
  MappingContextImpl(final MappingContextImpl context, final S source, final Class sourceType,
      final D destination, final Class destinationType, final Mapping mapping) {
    this.source = source;
    this.sourceType = sourceType;
    this.destination = destination;
    this.destinationType = destinationType;
    this.typeMap = null;
    this.mapping = mapping;
    parentSource = context.getParentSource();
    mappingEngine = context.mappingEngine;
    currentlyMapping = context.currentlyMapping;
    errors = context.errors;
    destinationCache = context.destinationCache;
    shadedPaths = context.shadedPaths;
  }

  @Override
public  MappingContext create(final CS source, final Class destinationType) {
    Assert.notNull(source, "source");
    Assert.notNull(destinationType, "destinationType");
    return new MappingContextImpl(this, source, Types.deProxy(source.getClass()), null,
        destinationType, mapping);
  }

  @Override
  public boolean equals(final Object obj) {
    if (this == obj)
      return true;
    if (obj == null || getClass() != obj.getClass())
      return false;

    MappingContextImpl other = (MappingContextImpl) obj;
    if (!source.equals(other.source))
      return false;
    if (!sourceType.equals(other.sourceType))
      return false;
    if (!destinationType.equals(other.destinationType))
      return false;
    return true;
  }

  public void finishedMapping(final Class type) {
    currentlyMapping.remove(type);
  }

  @Override
public D getDestination() {
    return destination;
  }

  @Override
public Class getDestinationType() {
    return destinationType;
  }

  @Override
public Mapping getMapping() {
    return mapping;
  }

  @Override
public MappingEngine getMappingEngine() {
    return mappingEngine;
  }

  @Override
public Class getRequestedType() {
    return destinationType;
  }

  @Override
public S getSource() {
    return source;
  }

  @Override
public Class getSourceType() {
    return sourceType;
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + source.hashCode();
    result = prime * result + sourceType.hashCode();
    result = prime * result + destinationType.hashCode();
    return result;
  }

  @Override
  public String toString() {
    return String.format("MappingContext[%s -> %s]", source, Types.toString(destinationType));
  }

  @Override
public TypeMap typeMap() {
    return typeMap;
  }

  /**
   * Marks {@code type} as currently being mapped.
   * 
   * @param type to mark as being mapped
   * @return boolean true if {@code type} is currently being mapped
   */
  boolean currentlyMapping(final Class type) {
    return !currentlyMapping.add(type);
  }

  /**
   * Determines whether the {@code subpath} is shaded.
   */
  boolean isShaded(final String subpath) {
    for (String shadedPath : shadedPaths)
      if (subpath.startsWith(shadedPath))
        return true;
    return false;
  }

  void setDestination(final D destination) {
    this.destination = destination;
  }

  void setTypeMap(final TypeMap typeMap) {
    this.typeMap = typeMap;
  }

  /**
   * Shades the {@code path} such that subsequent subpaths can be skipped during the mapping
   * process.
   */
  void shadePath(final String path) {
    shadedPaths.add(path);
  }

  public Object getParentSource() {
    return parentSource;
  }
	
	
  public void setParentSource(final Object parentSource) {
    this.parentSource = parentSource;
  }

}