/*
    * Copyright 2008 FatWire Corporation. All Rights Reserved.
    *
    * 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 com.fatwire.gst.foundation.facade.assetapi.asset;
  
  import java.io.Serializable;
  import java.util.AbstractMap;
  import java.util.Collection;
  import java.util.Date;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.TreeMap;
  
  import org.apache.commons.logging.Log;
  
  import com.fatwire.assetapi.common.AssetAccessException;
  import com.fatwire.assetapi.data.AssetData;
  import com.fatwire.assetapi.data.AssetId;
  import com.fatwire.assetapi.data.AttributeData;
  import com.fatwire.assetapi.data.BlobObject;
  import com.fatwire.assetapi.def.AttributeDef;
  import com.fatwire.gst.foundation.facade.assetapi.AttributeDataUtils;
  import com.fatwire.gst.foundation.facade.logging.LogUtil;
  import com.fatwire.mda.Dimension;
  
  /**
   * 
   * An asset that has loaded the attributes into memory. In the constructor all
   * the attributes are copied into memory and and can be accessed via the
   * {@link Map} methods.
   * <p/>
   * This class implements Serializable interface so the object can be serialized
   * if needed. The serialization use-case is the best use-case for this class.
   * The {@link AssetMapAdapter} is a better candidate to use if you are
   * interested in accessing attribute data as a Map, for instance in a expression
   * language like JSP EL.
   * 
   * 
   * @author Dolf.Dijkstra
   * @since Nov 23, 2009
   * @see AssetMapAdapter
   */
  
  public class ScatteredAsset extends AbstractMap<String, Object> implements Serializable {
      private static final Log LOG = LogUtil.getLog(ScatteredAsset.class);
  
      /**
  	 * 
  	 */
      private static final long serialVersionUID = -4978875079485732671L;
  
      private final AssetId id;
  
      private final Map<String, Object> attrMap = new TreeMap<String, Object>();
  
      /**
       * This constructor checks if the attributes are meta attributes and if so,
       * asks for the meta value. In case that you have a flex attribute with the
       * name 'description' the flex attribute value will not be used, but the
       * primary asset row 'description' field value.
       * 
       * @param delegate
       * @param attributes the names of attributes to load the data from into
       *            memory
       */
      public ScatteredAsset(AssetData delegate, String... attributes) {
          this(delegate, true, attributes);
  
      }
  
      /**
       * Reads all the attributes, in case of name collisions meta attributes take
       * precedence.
       * 
       * @param delegate
       */
      public ScatteredAsset(AssetData delegate) {
          this(delegate, true, delegate.getAttributeNames().toArray(new String[0]));
      }
  
      /**
       * This constructor checks if the attributes are meta attributes and based
       * on the passed in <tt>meta</tt> asks for the meta value.
       * 
      * @param delegate
      * @param meta true if the attributes are meta attributes
      * @param attributes the names of attributes to load the data from into
      *            memory
      */
 
     public ScatteredAsset(AssetData delegate, boolean meta, String... attributes) {
         super();
         id = delegate.getAssetId();
         Set<String> metaAttributes = new HashSet<String>();
         for (AttributeDef d : delegate.getAssetTypeDef().getAttributeDefs()) {
             if (d.isMetaDataAttribute() == meta)
                 metaAttributes.add(d.getName());
         }
         for (String name : attributes) {
             AttributeData attr = delegate.getAttributeData(name, metaAttributes.contains(name) == meta);
             if ("Dimension".equals(name)) {
                 Dimension s = AttributeDataUtils.asDimension(attr);
                 if (s != null)
                     attrMap.put(name, s);
 
             } else if (AttributeDataUtils.isSingleValued(attr)) {
                 extractSingleValue(name, attr);
             } else {
                 extractMultiValue(name, attr);
             }
         }
         extractParents(delegate);
     }
 
     private void extractParents(AssetData delegate) {
 
         List<AttributeDef> parentDefs = delegate.getAssetTypeDef().getParentDefs();
 
         if (parentDefs != null) {
             for (AttributeDef p : parentDefs) {
                 String name = p.getName();
                 try {
                     List<AssetId> parentIds = delegate.getImmediateParents(name);
 
                     attrMap.put("Group_" + name, parentIds);
                 } catch (AssetAccessException e) {
                     LOG.debug(e.getMessage() + " when collecting parent " + name + " on " + delegate.getAssetId());
                 }
             }
 
         }
 
     }
 
     /**
      * @param name
      * @param attr
      */
     private void extractSingleValue(String name, AttributeData attr) {
         switch (attr.getType()) {
 
             case STRING:
             case LARGE_TEXT:
                 String s = AttributeDataUtils.asString(attr);
                 if (s != null && s.length() > 0)
                     attrMap.put(name, s);
                 break;
 
             case INT: {
                 Integer obj = AttributeDataUtils.asInt(attr);
                 if (obj != null)
                     attrMap.put(name, obj);
                 break;
             }
 
             case LONG: {
                 Long obj = AttributeDataUtils.asLong(attr);
                 if (obj != null)
                     attrMap.put(name, obj);
                 break;
             }
             case MONEY:
             case FLOAT: {
                 Float obj = AttributeDataUtils.asFloat(attr);
                 if (obj != null)
                     attrMap.put(name, obj);
                 break;
             }
             case DATE: {
                 Date obj = AttributeDataUtils.asDate(attr);
                 if (obj != null)
                     attrMap.put(name, obj);
                 break;
             }
 
             case ASSET:
             case ASSETREFERENCE: {
                 AssetId obj = AttributeDataUtils.asAssetId(attr);
                 if (obj != null)
                     attrMap.put(name, obj);
                 break;
             }
             case BLOB:
             case URL: {
                 BlobObject blob = AttributeDataUtils.asBlob(attr);
                 if (blob != null)
                     attrMap.put(name, blob);
                 break;
             }
 
             case ARRAY:
             case STRUCT:
             case LIST:
             case ONEOF:
                 Object o = attr.getData();
                 int size = 0;
                 if (o instanceof Collection<?>) {
                     size = ((Collection<?>) o).size();
                 } else if (o instanceof Map<?, ?>) {
                     size = ((Map<?, ?>) o).size();
                 } else {
                     LOG.debug("Attribute '" + name + "' of type  " + attr.getType() + " returned a "
                             + o.getClass().getName());
                     size = 1;
                 }
                 if (size > 0)
                     attrMap.put(name, attr.getData());
         }
     }
 
     /**
      * @param name
      * @param attr
      */
     private void extractMultiValue(String name, AttributeData attr) {
         switch (attr.getType()) {
 
             case STRING:
             case LARGE_TEXT:
                 List<String> s = AttributeDataUtils.asStringList(attr);
                 if (s != null && s.size() > 0)
                     attrMap.put(name, s);
                 break;
 
             case INT: {
                 List<Integer> obj = AttributeDataUtils.asIntList(attr);
                 if (obj != null && obj.size() > 0)
                     attrMap.put(name, obj);
                 break;
             }
 
             case LONG: {
                 List<Long> obj = AttributeDataUtils.asLongList(attr);
                 if (obj != null && obj.size() > 0)
                     attrMap.put(name, obj);
                 break;
             }
             case MONEY:
             case FLOAT: {
                 List<Float> obj = AttributeDataUtils.asFloatList(attr);
                 if (obj != null && obj.size() > 0)
                     attrMap.put(name, obj);
                 break;
             }
             case DATE: {
                 List<Date> obj = AttributeDataUtils.asDateList(attr);
                 if (obj != null && obj.size() > 0)
                     attrMap.put(name, obj);
                 break;
             }
 
             case ASSET:
             case ASSETREFERENCE: {
                 List<AssetId> obj = AttributeDataUtils.asAssetIdList(attr);
                 if (obj != null && obj.size() > 0)
                     attrMap.put(name, obj);
                 break;
             }
             case BLOB:
             case URL: {
                 List<BlobObject> obj = AttributeDataUtils.asBlobList(attr);
                 if (obj != null && obj.size() > 0)
                     attrMap.put(name, obj);
                 break;
             }
 
             case ARRAY:
             case STRUCT:
             case LIST:
             case ONEOF:
                 Object o = attr.getData();
                 int size = 0;
                 if (o instanceof Collection<?>) {
                     size = ((Collection<?>) o).size();
                 } else if (o instanceof Map<?, ?>) {
                     size = ((Map<?, ?>) o).size();
                 } else {
                     LOG.debug("Attribute '" + name + "' of type  " + attr.getType() + " returned a "
                             + o.getClass().getName());
                     size = 1;
                 }
                 if (size > 0)
                     attrMap.put(name, attr.getData());
         }
     }
 
     /**
      * @return the id of this asset
      * @see com.fatwire.assetapi.data.AssetData#getAssetId()
      */
     public AssetId getAssetId() {
         return id;
     }
 
     @Override
     public Set<java.util.Map.Entry<String, Object>> entrySet() {
         return attrMap.entrySet();
     }
 
 }