/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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 org.apache.myfaces.tobago.renderkit;
  
  import org.apache.commons.lang.ArrayUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.apache.myfaces.tobago.util.ComponentUtils;
  
  import javax.faces.FacesException;
  import javax.faces.component.UIComponent;
  import javax.faces.component.UISelectMany;
  import javax.faces.context.FacesContext;
  import javax.faces.convert.Converter;
  import javax.faces.convert.ConverterException;
  import javax.faces.el.ValueBinding;
  import java.lang.reflect.Array;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  
  public class SelectManyRendererBase extends LayoutComponentRendererBase {
  
    private static final Logger LOG = LoggerFactory.getLogger(SelectManyRendererBase.class);
  
    public void decode(FacesContext facesContext, UIComponent component) {
      if (ComponentUtils.isOutputOnly(component)) {
        return;
      }
      if (component instanceof UISelectMany) {
        UISelectMany uiSelectMany = (UISelectMany) component;
  
        String[] newValues = (String[])
            facesContext.getExternalContext().getRequestParameterValuesMap().get(uiSelectMany.getClientId(facesContext));
        if (LOG.isDebugEnabled()) {
          LOG.debug("decode: key='" + component.getClientId(facesContext)
              + "' value='" + Arrays.toString(newValues) + "'");
          LOG.debug("size ... '" + (newValues != null ? newValues.length : -1) + "'");
          if (newValues != null) {
            for (String newValue : newValues) {
              LOG.debug("newValues[i] = '" + newValue + "'");
            }
          }
        }
  
        if (newValues == null) {
          newValues = ArrayUtils.EMPTY_STRING_ARRAY; // because no selection will not submitted by browsers
        }
        uiSelectMany.setSubmittedValue(newValues);
      }
    }
  
    // the following is copied from myfaces shared RendererUtils
    public Object getConvertedValue(FacesContext facesContext, UIComponent component, Object submittedValue)
        throws ConverterException {
  
      if (submittedValue == null) {
        return null;
      } else {
        if (!(submittedValue instanceof String[])) {
          throw new ConverterException("Submitted value of type String[] for component : "
              + component.getClientId(facesContext) + "expected");
        }
      }
      return getConvertedUISelectManyValue(facesContext, (UISelectMany) component, (String[]) submittedValue);
    }
  
    private Object getConvertedUISelectManyValue(FacesContext facesContext,
        UISelectMany component,
        String[] submittedValue)
        throws ConverterException {
      // Attention!
      // This code is duplicated in jsfapi component package.
      // If you change something here please do the same in the other class!
  
      if (submittedValue == null) {
        throw new NullPointerException("submittedValue");
      }
  
      ValueBinding vb = component.getValueBinding("value");
      Class valueType = null;
      Class arrayComponentType = null;
     if (vb != null) {
       valueType = vb.getType(facesContext);
       if (valueType != null && valueType.isArray()) {
         arrayComponentType = valueType.getComponentType();
       }
     }
 
     Converter converter = component.getConverter();
     if (converter == null) {
       if (valueType == null) {
         // No converter, and no idea of expected type
         // --> return the submitted String array
         return submittedValue;
       }
 
       if (List.class.isAssignableFrom(valueType)) {
         // expected type is a List
         // --> according to javadoc of UISelectMany we assume that the element type
         //     is java.lang.String, and copy the String array to a new List
         return Arrays.asList(submittedValue);
       }
 
       if (arrayComponentType == null) {
         throw new IllegalArgumentException("ValueBinding for UISelectMany must be of type List or Array");
       }
 
       if (String.class.equals(arrayComponentType)) {
         return submittedValue; //No conversion needed for String type
       }
       if (Object.class.equals(arrayComponentType)) {
         return submittedValue; //No conversion for Object class
       }
 
       try {
         converter = facesContext.getApplication().createConverter(arrayComponentType);
       } catch (FacesException e) {
         LOG.error("No Converter for type " + arrayComponentType.getName() + " found", e);
         return submittedValue;
       }
     }
 
     // Now, we have a converter...
     // We determine the type of the component array after converting one of it's elements
     if (vb != null && arrayComponentType == null
         && valueType != null && valueType.isArray()) {
       if (submittedValue.length > 0) {
         arrayComponentType = converter.getAsObject(facesContext, component, submittedValue[0]).getClass();
       }
     }
 
     if (valueType == null) {
       // ...but have no idea of expected type
       // --> so let's convert it to an Object array
       int len = submittedValue.length;
       Object[] convertedValues = (Object[]) Array.newInstance(
           arrayComponentType == null ? Object.class : arrayComponentType, len);
       for (int i = 0; i < len; i++) {
         convertedValues[i]
             = converter.getAsObject(facesContext, component, submittedValue[i]);
       }
       return convertedValues;
     }
 
     if (List.class.isAssignableFrom(valueType)) {
       // Curious case: According to specs we should assume, that the element type
       // of this List is java.lang.String. But there is a Converter set for this
       // component. Because the user must know what he is doing, we will convert the values.
       int length = submittedValue.length;
       List<Object> list = new ArrayList<Object>(length);
       for (int i = 0; i < length; i++) {
         list.add(converter.getAsObject(facesContext, component, submittedValue[i]));
       }
       return list;
     }
 
     if (arrayComponentType == null) {
       throw new IllegalArgumentException("ValueBinding for UISelectMany must be of type List or Array");
     }
 
     if (arrayComponentType.isPrimitive()) {
       // primitive array
       int len = submittedValue.length;
       Object convertedValues = Array.newInstance(arrayComponentType, len);
       for (int i = 0; i < len; i++) {
         Array.set(convertedValues, i,
             converter.getAsObject(facesContext, component, submittedValue[i]));
       }
       return convertedValues;
     } else {
       // Object array
       int length = submittedValue.length;
       List<Object> convertedValues = new ArrayList<Object>(length);
       for (int i = 0; i < length; i++) {
         convertedValues.add(i, converter.getAsObject(facesContext, component, submittedValue[i]));
       }
       return convertedValues.toArray((Object[]) Array.newInstance(arrayComponentType, length));
     }
   }
 
 }