/**
    * Copyright 2005-2014 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.rice.krad.uif.widget;
  
  import java.io.Serializable;
  import java.util.List;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.krad.datadictionary.parse.BeanTag;
  import org.kuali.rice.krad.datadictionary.parse.BeanTagAttribute;
  import org.kuali.rice.krad.uif.component.BindingInfo;
  import org.kuali.rice.krad.uif.component.MethodInvokerConfig;
  import org.kuali.rice.krad.uif.field.AttributeQuery;
  import org.kuali.rice.krad.uif.field.InputField;
  import org.kuali.rice.krad.uif.lifecycle.ViewLifecycle;
  import org.kuali.rice.krad.uif.util.LifecycleElement;
  import org.kuali.rice.krad.uif.util.ScriptUtils;
  import org.kuali.rice.krad.uif.view.View;
  
  /**
   * Widget that provides dynamic select options to the user as they are entering the value (also known
   * as auto-complete).
   *
   * <p>Widget is backed by an {@link org.kuali.rice.krad.uif.field.AttributeQuery} that provides the configuration
   * for executing a query server side that will retrieve the valid option values.</p>
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  @BeanTag(name = "suggest", parent = "Uif-Suggest")
  public class Suggest extends WidgetBase {
      private static final long serialVersionUID = 7373706855319347225L;
  
      private AttributeQuery suggestQuery;
  
      private String valuePropertyName;
      private String labelPropertyName;
      private List<String> additionalPropertiesToReturn;
  
      private boolean returnFullQueryObject;
  
      private boolean retrieveAllSuggestions;
      private List<Object> suggestOptions;
  
      private String suggestOptionsJsString;
  
      public Suggest() {
          super();
      }
  
      /**
       * The following updates are done here:
       *
       * <ul>
       * <li>Invoke expression evaluation on the suggestQuery</li>
       * </ul>
       *
       * {@inheritDoc}
       */
      public void performApplyModel(Object model, LifecycleElement parent) {
          super.performApplyModel(model, parent);
  
          if (suggestQuery != null) {
              ViewLifecycle.getExpressionEvaluator().evaluateExpressionsOnConfigurable(ViewLifecycle.getView(),
                      suggestQuery, getContext());
          }
      }
  
      /**
       * The following actions are performed:
       *
       * <ul>
       * <li>Adjusts the query field mappings on the query based on the binding configuration of the field</li>
       * <li>TODO: determine query if render is true and query is not set</li>
       * </ul>
       *
       * {@inheritDoc}
       */
      @Override
      public void performFinalize(Object model, LifecycleElement parent) {
          super.performFinalize(model, parent);
  
          // check for necessary configuration
          if (!isSuggestConfigured()) {
              setRender(false);
          }
  
         if (!isRender()) {
             return;
         }
 
         if (retrieveAllSuggestions) {
             if (suggestOptions == null || suggestOptions.isEmpty()) {
                 // execute query method to retrieve up front suggestions
                 if (suggestQuery.hasConfiguredMethod()) {
                     retrieveSuggestOptions(ViewLifecycle.getView());
                 }
             } else {
                 suggestOptionsJsString = ScriptUtils.translateValue(suggestOptions);
             }
         } else {
             // adjust from side on query field mapping to match parent fields path
             InputField field = (InputField) parent;
 
             BindingInfo bindingInfo = field.getBindingInfo();
             suggestQuery.updateQueryFieldMapping(bindingInfo);
 
             if (suggestQuery != null) {
                 suggestQuery.defaultQueryTarget(ViewLifecycle.getHelper());
             }
         }
     }
 
     /**
      * Indicates whether the suggest widget has the necessary configuration to render
      *
      * @return true if the necessary configuration is present, false if not
      */
     public boolean isSuggestConfigured() {
         if (StringUtils.isNotBlank(valuePropertyName) || suggestQuery.hasConfiguredMethod() ||
                 (suggestOptions != null && !suggestOptions.isEmpty())) {
             return true;
         }
 
         return false;
     }
 
     /**
      * Invokes the configured query method and sets the returned method value as the suggest options or
      * suggest options JS string
      *
      * @param view view instance the suggest belongs to, used to get the view helper service if needed
      */
     protected void retrieveSuggestOptions(View view) {
         String queryMethodToCall = suggestQuery.getQueryMethodToCall();
         MethodInvokerConfig queryMethodInvoker = suggestQuery.getQueryMethodInvokerConfig();
 
         if (queryMethodInvoker == null) {
             queryMethodInvoker = new MethodInvokerConfig();
         }
 
         // if method not set on invoker, use queryMethodToCall, note staticMethod could be set(don't know since
         // there is not a getter), if so it will override the target method in prepare
         if (StringUtils.isBlank(queryMethodInvoker.getTargetMethod())) {
             queryMethodInvoker.setTargetMethod(queryMethodToCall);
         }
 
         // if target class or object not set, use view helper service
         if ((queryMethodInvoker.getTargetClass() == null) && (queryMethodInvoker.getTargetObject() == null)) {
             queryMethodInvoker.setTargetObject(view.getViewHelperService());
         }
 
         try {
             queryMethodInvoker.prepare();
 
             Object methodResult = queryMethodInvoker.invoke();
             if (methodResult instanceof String) {
                 suggestOptionsJsString = (String) methodResult;
             } else if (methodResult instanceof List) {
                 suggestOptions = (List<Object>) methodResult;
                 suggestOptionsJsString = ScriptUtils.translateValue(suggestOptions);
             } else {
                 throw new RuntimeException("Suggest query method did not return List<String> for suggestions");
             }
         } catch (Exception e) {
             throw new RuntimeException("Unable to invoke query method: " + queryMethodInvoker.getTargetMethod(), e);
         }
     }
 
     /**
      * Returns object containing post data to store for the suggest request.
      *
      * @return suggest post data instance
      */
     public SuggestPostData getPostData() {
         return new SuggestPostData(this);
     }
 
     /**
      * Attribute query instance the will be executed to provide
      * the suggest options
      *
      * @return AttributeQuery
      */
     @BeanTagAttribute(type = BeanTagAttribute.AttributeType.DIRECTORBYTYPE)
     public AttributeQuery getSuggestQuery() {
         return suggestQuery;
     }
 
     /**
      * Setter for the suggest attribute query
      *
      * @param suggestQuery
      */
     public void setSuggestQuery(AttributeQuery suggestQuery) {
         this.suggestQuery = suggestQuery;
     }
 
     /**
      * Name of the property on the query result object that provides
      * the options for the suggest, values from this field will be
      * collected and sent back on the result to provide as suggest options.
      *
      * <p>If a labelPropertyName is also set,
      * the property specified by it will be used as the label the user selects (the suggestion), but the value will
      * be the value retrieved by this property.  If only one of labelPropertyName or valuePropertyName is set,
      * the property's value on the object will be used for both the value inserted on selection and the suggestion
      * text (most default cases only a valuePropertyName would be set).</p>
      *
      * @return source property name
      */
     @BeanTagAttribute
     public String getValuePropertyName() {
         return valuePropertyName;
     }
 
     /**
      * Setter for the value property name
      *
      * @param valuePropertyName
      */
     public void setValuePropertyName(String valuePropertyName) {
         this.valuePropertyName = valuePropertyName;
     }
 
     /**
      * Name of the property on the query result object that provides the label for the suggestion.
      *
      * <p>This should
      * be set when the label that the user selects is different from the value that is inserted when a user selects a
      * suggestion. If only one of labelPropertyName or valuePropertyName is set,
      * the property's value on the object will be used for both the value inserted on selection and the suggestion
      * text (most default cases only a valuePropertyName would be set).</p>
      *
      * @return labelPropertyName representing the property to use for the suggestion label of the item
      */
     @BeanTagAttribute
     public String getLabelPropertyName() {
         return labelPropertyName;
     }
 
     /**
      * Set the labelPropertyName
      *
      * @param labelPropertyName
      */
     public void setLabelPropertyName(String labelPropertyName) {
         this.labelPropertyName = labelPropertyName;
     }
 
     /**
      * List of additional properties to return in the result objects to the plugin's success callback.
      *
      * <p>In most cases, this should not be set.  The main use case
      * of setting this list is to use additional properties in the select function on the plugin's options, so
      * it is only recommended that this property be set when doing heavy customization to the select function.
      * This list is not used if the full result object is already being returned.</p>
      *
      * @return the list of additional properties to send back
      */
     @BeanTagAttribute
     public List<String> getAdditionalPropertiesToReturn() {
         return additionalPropertiesToReturn;
     }
 
     /**
      * Set the list of additional properties to return to the plugin success callback results
      *
      * @param additionalPropertiesToReturn
      */
     public void setAdditionalPropertiesToReturn(List<String> additionalPropertiesToReturn) {
         this.additionalPropertiesToReturn = additionalPropertiesToReturn;
     }
 
     /**
      * When set to true the results of a query method will be sent back as-is (in translated form) with all properties
      * intact.
      *
      * <p>
      * Note this is not supported for highly complex objects (ie, most auto-query objects - will throw exception).
      * Intended usage of this flag is with custom query methods which return simple data objects.
      * The query method can return a list of Strings which will be used for the suggestions, a list of objects
      * with 'label' and 'value' properties, or a custom object.  In the case of using a customObject
      * labelPropertyName or valuePropertyName MUST be specified (or both) OR the custom object must contain a
      * property named "label" or "value" (or both) for the suggestions to appear.  In cases where this is not used,
      * the data sent back represents a slim subset of the properties on the object.
      * </p>
      *
      * @return true if the query method results should be used as the suggestions, false to assume
      * objects are returned and suggestions are formed using the source property name
      */
     @BeanTagAttribute
     public boolean isReturnFullQueryObject() {
         return returnFullQueryObject;
     }
 
     /**
      * Setter for the for returning the full object of the query
      *
      * @param returnFullQueryObject
      */
     public void setReturnFullQueryObject(boolean returnFullQueryObject) {
         this.returnFullQueryObject = returnFullQueryObject;
     }
 
     /**
      * Indicates whether all suggest options should be retrieved up front and provide to the suggest
      * widget as options locally
      *
      * <p>
      * Use this for a small list of options to improve performance. The query will be performed on the client
      * to filter the provider options based on the users input instead of doing a query each time
      * </p>
      *
      * <p>
      * When a query method is configured and this option set to true the method will be invoked to set the
      * options. The query method should not take any arguments and should return the suggestion options
      * List or the JS String as a result. If a query method is not configured the suggest options can be
      * set through configuration or a view helper method (for example a component finalize method)
      * </p>
      *
      * @return true to provide the suggest options initially, false to use ajax retrieval based on the
      * user's input
      */
     @BeanTagAttribute
     public boolean isRetrieveAllSuggestions() {
         return retrieveAllSuggestions;
     }
 
     /**
      * Setter for the retrieve all suggestions indicator
      *
      * @param retrieveAllSuggestions
      */
     public void setRetrieveAllSuggestions(boolean retrieveAllSuggestions) {
         this.retrieveAllSuggestions = retrieveAllSuggestions;
     }
 
     /**
      * When {@link #isRetrieveAllSuggestions()} is true, this list provides the full list of suggestions
      *
      * <p>
      * If a query method is configured that method will be invoked to populate this list, otherwise the
      * list should be populated through configuration or the view helper
      * </p>
      *
      * <p>
      * The suggest options can either be a list of Strings, in which case the strings will be the suggested
      * values. Or a list of objects. If the object does not have 'label' and 'value' properties, a custom render
      * and select method must be provided
      * </p>
      *
      * @return list of suggest options
      */
     @BeanTagAttribute
     public List<Object> getSuggestOptions() {
         return suggestOptions;
     }
 
     /**
      * Setter for the list of suggest options
      *
      * @param suggestOptions
      */
     public void setSuggestOptions(List<Object> suggestOptions) {
         this.suggestOptions = suggestOptions;
     }
 
     /**
      * Returns the suggest options as a JS String (set by the framework from method invocation)
      *
      * @return suggest options JS string
      */
     public String getSuggestOptionsJsString() {
         if (StringUtils.isNotBlank(suggestOptionsJsString)) {
             return this.suggestOptionsJsString;
         }
 
         return "null";
     }
 
     /**
      * Sets suggest options javascript string
      *
      * @param suggestOptionsJsString
      */
     public void setSuggestOptionsJsString(String suggestOptionsJsString) {
         this.suggestOptionsJsString = suggestOptionsJsString;
     }
 
     /**
      * Holds post data for the suggest component.
      */
     public static class SuggestPostData implements Serializable {
         private static final long serialVersionUID = 997780560864981128L;
 
         private String id;
 
         private AttributeQuery suggestQuery;
 
         private String valuePropertyName;
         private String labelPropertyName;
         private List<String> additionalPropertiesToReturn;
         private boolean returnFullQueryObject;
         private boolean retrieveAllSuggestions;
 
         /**
          * Constructor taking suggest widget to pull post data from.
          *
          * @param suggest component instance to pull data
          */
         public SuggestPostData(Suggest suggest) {
             this.id = suggest.getId();
             this.suggestQuery = suggest.getSuggestQuery();
             this.valuePropertyName = suggest.getValuePropertyName();
             this.labelPropertyName = suggest.getLabelPropertyName();
             this.additionalPropertiesToReturn = suggest.getAdditionalPropertiesToReturn();
             this.returnFullQueryObject = suggest.isReturnFullQueryObject();
             this.retrieveAllSuggestions = suggest.isRetrieveAllSuggestions();
         }
 
         /**
          * @see org.kuali.rice.krad.uif.util.LifecycleElement#getId()
          */
         public String getId() {
             return id;
         }
 
         /**
          * @see Suggest#getSuggestQuery()
          */
         public AttributeQuery getSuggestQuery() {
             return suggestQuery;
         }
 
         /**
          * @see Suggest#getValuePropertyName()
          */
         public String getValuePropertyName() {
             return valuePropertyName;
         }
 
         /**
          * @see Suggest#getLabelPropertyName()
          */
         public String getLabelPropertyName() {
             return labelPropertyName;
         }
 
         /**
          * @see Suggest#getAdditionalPropertiesToReturn()
          */
         public List<String> getAdditionalPropertiesToReturn() {
             return additionalPropertiesToReturn;
         }
 
         /**
          * @see Suggest#isReturnFullQueryObject()
          */
         public boolean isReturnFullQueryObject() {
             return returnFullQueryObject;
         }
 
         /**
          * @see Suggest#isRetrieveAllSuggestions()
          */
         public boolean isRetrieveAllSuggestions() {
             return retrieveAllSuggestions;
         }
     }
 }