/**

  * Copyright 2010 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.osedu.org/licenses/ECL-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.kuali.student.common.ui.client.configurable.mvc.sections;

 import java.util.ArrayList;

 import java.util.HashSet;

 import java.util.List;

 import org.kuali.student.common.assembly.data.Data;

 import org.kuali.student.common.assembly.data.QueryPath;

 import org.kuali.student.common.assembly.data.Data.Key;

 import org.kuali.student.common.ui.client.application.Application;

 import org.kuali.student.common.ui.client.configurable.mvc.CanProcessValidationResults;

 import org.kuali.student.common.ui.client.configurable.mvc.FieldDescriptor;

 import org.kuali.student.common.ui.client.configurable.mvc.LayoutController;

 import org.kuali.student.common.ui.client.configurable.mvc.ValidationEventBinding;

 import org.kuali.student.common.ui.client.configurable.mvc.ValidationEventBindingImpl;

 import org.kuali.student.common.ui.client.configurable.mvc.binding.ModelWidgetBinding;

 import org.kuali.student.common.ui.client.configurable.mvc.binding.ModelWidgetBindingSupport;

 import org.kuali.student.common.ui.client.configurable.mvc.multiplicity.MultiplicityComposite;

 import org.kuali.student.common.ui.client.configurable.mvc.multiplicity.MultiplicityGroup;

 import org.kuali.student.common.ui.client.configurable.mvc.multiplicity.MultiplicityGroupItem;

 import org.kuali.student.common.ui.client.configurable.mvc.multiplicity.MultiplicityItem;

 import org.kuali.student.common.ui.client.event.ContentDirtyEvent;

 import org.kuali.student.common.ui.client.event.ValidateRequestEvent;

 import org.kuali.student.common.ui.client.mvc.Callback;

 import org.kuali.student.common.ui.client.mvc.Controller;

 import org.kuali.student.common.ui.client.mvc.DataModel;

 import org.kuali.student.common.ui.client.mvc.HasCrossConstraints;

 import org.kuali.student.common.ui.client.mvc.ModelRequestCallback;

 import org.kuali.student.common.ui.client.mvc.View;

 import org.kuali.student.common.ui.client.widgets.field.layout.element.AbbrPanel;

 import org.kuali.student.common.ui.client.widgets.field.layout.element.FieldElement;

 import org.kuali.student.common.ui.client.widgets.field.layout.element.SpanPanel;

 import org.kuali.student.common.ui.client.widgets.field.layout.layouts.FieldLayout;

 import org.kuali.student.common.validation.dto.ValidationResultInfo;

 import org.kuali.student.common.validation.dto.ValidationResultInfo.ErrorLevel;

 import com.google.gwt.core.client.GWT;

 import com.google.gwt.user.client.ui.Widget;

 /**

  * The base section is the base implementation of the section interface.

  * @author Kuali Student

  *

  */

 public abstract class BaseSection extends SpanPanel implements Section{

         protected FieldLayout layout;

         protected ArrayList<Section> sections = new ArrayList<Section>();

         protected ArrayList<FieldDescriptor> fields = new ArrayList<FieldDescriptor>();

         protected LayoutController layoutController = null;

         protected boolean isValidationEnabled = true;

         protected boolean isDirty = false;

         /**

          * Adds a field to this section.  Adds the field to this section's layout.

          * Attaches an event handler for lost focus events on the field widget

          * to validate against the metadata defined in its FieldDescriptor as well as firing events for dirty

          * field handling.

          * 

          * Note if a field has been marked as hidden in the dictionary, this method will not add this field to the layout.

          * If it is not visible the key returned by making call to addField is null.

          * 

          * @param field

          * @return key/path of this field

          */

         @Override

         public String addField(final FieldDescriptor fieldDescriptor) {

                 String key = null;

                 if (fieldDescriptor.isVisible()){

                         fields.add(fieldDescriptor);

                 key = layout.addField(fieldDescriptor.getFieldElement());

                 ValidationEventBinding binding = new ValidationEventBindingImpl();

                 if(fieldDescriptor.getValidationRequestCallback()== null){

                     fieldDescriptor.setValidationCallBack(new Callback<Boolean>() {

                         @Override

                         public void exec(Boolean result) {

                                 final ModelWidgetBinding mwb = fieldDescriptor.getModelWidgetBinding();

                                 if (mwb != null) {

                                     final Widget w = fieldDescriptor.getFieldWidget();

                                     final String modelId = fieldDescriptor.getModelId();

                                     final Controller parent;

                                 Controller findResult = LayoutController.findParentLayout(w);

                                 if(BaseSection.this instanceof View){

                                         findResult = ((View)BaseSection.this).getController();

                                 }

                                 parent = findResult;

                                 if(parent != null){

                                         if (modelId == null) {

                                                 parent.requestModel(new ModelRequestCallback<DataModel>() {

                                                         @Override

                                                         public void onModelReady(DataModel model) {

                                                                 validateField(fieldDescriptor, model, parent);

                                                                 //Cross referenced field update:

                                                                 HashSet<HasCrossConstraints> fds = Application.getApplicationContext().getCrossConstraint(null, Application.getApplicationContext().getParentPath()+fieldDescriptor.getFieldKey());

                                                                 if(fds!=null){

                                                                         for(HasCrossConstraints fd:fds){

                                                                                 fd.reprocessWithUpdatedConstraints();

                                                                         }

                                                                 }

                                                         }

                                                         @Override

                                                         public void onRequestFail(Throwable cause) {

                                                                 GWT.log("Unable to retrieve model to validate " + fieldDescriptor.getFieldKey(), null);

                                                         }

                                                 });

                                         } else {

                                                 parent.requestModel(modelId, new ModelRequestCallback<DataModel>() {

                                                         @Override

                                                         public void onModelReady(DataModel model) {

                                                                 validateField(fieldDescriptor, model, parent);

                                                         }

                                                         @Override

                                                         public void onRequestFail(Throwable cause) {

                                                                 GWT.log("Unable to retrieve model to validate " + fieldDescriptor.getFieldKey(), null);

                                                         }

                                                 });                                }

                                         }

                             } else {

                                 GWT.log(fieldDescriptor.getFieldKey() + " has no widget binding.", null);

                             }

                         }

                     });

                 }

                 binding.bind(fieldDescriptor);

                 }               

         return key;

         }

         private void validateField(

                         final FieldDescriptor fieldDescriptor, final DataModel model, Controller controller) {

                 Widget w = fieldDescriptor.getFieldWidget();

                 ModelWidgetBinding mwb = fieldDescriptor.getModelWidgetBinding();

                 if(fieldDescriptor.getFieldKey() != null){

                         mwb.setModelValue(w, model, fieldDescriptor.getFieldKey());

                         dirtyCheckField(fieldDescriptor, model);

                         ValidateRequestEvent e = new ValidateRequestEvent();

                         e.setFieldDescriptor(fieldDescriptor);

                         e.setValidateSingleField(true);

                         controller.fireApplicationEvent(e);

                 }

         }

         private void dirtyCheckField(FieldDescriptor fieldDescriptor, DataModel model){

         QueryPath fieldPath = QueryPath.parse(fieldDescriptor.getFieldKey());

                 QueryPath qPathDirty = fieldPath.subPath(0, fieldPath.size() - 1);

             qPathDirty.add(ModelWidgetBindingSupport.RUNTIME_ROOT);

             qPathDirty.add(ModelWidgetBindingSupport.DIRTY_PATH);

             qPathDirty.add(fieldPath.get(fieldPath.size()-1));

             Boolean dirty = false;

             if(ensureDirtyFlagPath(model.getRoot(), qPathDirty)){

                     dirty = model.get(qPathDirty);

             }

             if(dirty){

                     setIsDirty(true);

                     fieldDescriptor.setDirty(true);

             }

         }

     protected boolean ensureDirtyFlagPath(Data root, QueryPath path) {

         Data current = root;

         boolean containsFlag = false;

         for (int i = 0; i < path.size(); i++) {

             Key key = path.get(i);

             if(i == path.size() - 1){

                     containsFlag = current.containsKey(key);

                     break;

             }

             Data d = current.get(key);

             if (d == null) {

                 containsFlag = false;

                 break;

             }

             current = d;

         }

         return containsFlag;

     }

         /** 

          * Adds a section to this section's layout.

          * 

          * @see org.kuali.student.common.ui.client.configurable.mvc.sections.Section#addSection(org.kuali.student.common.ui.client.configurable.mvc.sections.Section)

          */

         @Override

         public String addSection(Section section) {

         section.setLayoutController(layoutController);

                 sections.add(section);

         String key = layout.addLayout(section.getLayout());

         return key;

         }

         /**

          * Removes a section from this section's layout.

          * 

          * @see org.kuali.student.common.ui.client.configurable.mvc.sections.Section#removeSection(org.kuali.student.common.ui.client.configurable.mvc.sections.Section)

          */

         @Override

         public void removeSection(Section section){

                 sections.remove(section);

                 layout.removeLayoutElement(section.getLayout());

         }

         /**

          * Clear all validation errors from the layout (removes all red highlight and error text shown on the

          * screen)

          */

         protected void clearValidationErrors() {

                 layout.clearValidationErrors();

         }

         /**

          * Clear all validation warnings from the layout (removes all yellow highlight and warning text shown on the

          * screen)

          */

         public void clearValidationWarnings() {

                 layout.clearValidationWarnings();

         }

         /**

          * Gets all the fields in a section and its subsections.

          * 

          * @see org.kuali.student.common.ui.client.configurable.mvc.sections.Section#getFields()

          */

         @Override

         public List<FieldDescriptor> getFields() {

         List<FieldDescriptor> allFields = new ArrayList<FieldDescriptor>();

         allFields.addAll(fields);

         for(Section ns: sections){

             allFields.addAll(ns.getFields());

         }

         return allFields;

         }

         /**

          * Gets all the fields in this section, but does not include fields in its nested sections.

          * @see org.kuali.student.common.ui.client.configurable.mvc.sections.Section#getUnnestedFields()

          */

         @Override

         public List<FieldDescriptor> getUnnestedFields() {

         return fields;

         }

         /**

          * Gets all nested sections contained in this section

          * @see org.kuali.student.common.ui.client.configurable.mvc.sections.Section#getSections()

          */

         @Override

         public List<Section> getSections() {

                 return sections;

         }

         /**

          * Processes the validation results passed in and displays the appropriate message on the screen next

          * to the corresponding field or section.  If clearAllValidation is true, it will clear all validation before

          * displaying the errors (otherwise will append these errors to the ones already visible on the section).

          * @see org.kuali.student.common.ui.client.configurable.mvc.sections.Section#processValidationResults(java.util.List, boolean)

          */

         @Override

         public ErrorLevel processValidationResults(List<ValidationResultInfo> results, boolean clearErrors){

                 if(clearErrors){

                         this.clearValidationErrors();

                 }

                 ErrorLevel status = ErrorLevel.OK;

                 if (isValidationEnabled){

                         for(FieldDescriptor f: this.fields){

                                 if(f.hasHadFocus()){

                                         for(ValidationResultInfo vr: results){

                         String vrElement = vr.getElement();

                         if(vrElement.startsWith("/")){

                             vrElement = vrElement.substring(1);

                         }

                         //Strip out end indexes for collections of primitives to be handled by the element

                         vrElement = vrElement.replaceFirst("^(\\S+)/[0-9]+$", "$1");

                         //Check the parent path (mostly for mapping validation to specializations)

                         String parentPath = Application.getApplicationContext().getParentPath();

                         parentPath = parentPath==null?"":parentPath;

                                                 if(vrElement.equals(parentPath+f.getFieldKey())){

                                                         FieldElement element = f.getFieldElement();

                                                         if (element != null){

                                                                 ErrorLevel fieldStatus = element.processValidationResult(vr);

                                                                 if(fieldStatus.getLevel() > status.getLevel()){

                                                                         status = fieldStatus;

                                                                 }

                                                         }

                                                 }

                                         }

                                 }

                                 if(f.getFieldWidget() instanceof MultiplicityComposite ){

                                         MultiplicityComposite mc = (MultiplicityComposite) f.getFieldWidget();

                                         //possibly return error state from processValidationResults to give composite title bar a separate color

                             for(MultiplicityItem item: mc.getItems()){

                                     if(item.getItemWidget() instanceof Section && !item.isDeleted()){

                                             ErrorLevel fieldStatus = ((Section)item.getItemWidget()).processValidationResults(results, clearErrors);

                                                         if(fieldStatus.getLevel() > status.getLevel()){

                                                                 status = fieldStatus;

                                                         }

                                     }

                             }

                                 }

                                 // TODO Can we do this without checking for instanceof  MG??

                                 if(f.getFieldWidget() instanceof MultiplicityGroup ){

                                         MultiplicityGroup mg = (MultiplicityGroup) f.getFieldWidget();

                                         //possibly return error state from processValidationResults to give composite title bar a separate color

                             for(MultiplicityGroupItem item: mg.getItems()){

                                     if(item.getItemWidget() instanceof Section && !item.isDeleted()){

                                             ErrorLevel fieldStatus = ((Section)item.getItemWidget()).processValidationResults(results, clearErrors);

                                                         if(fieldStatus.getLevel() > status.getLevel()){

                                                                 status = fieldStatus;

                                                         }

                                     }

                             }

                                 }

                 if (f.getFieldWidget() instanceof CanProcessValidationResults) {

                     ErrorLevel fieldStatus = ((CanProcessValidationResults) f.getFieldWidget()).processValidationResults(f, results, clearErrors);

                     if (fieldStatus.getLevel() > status.getLevel()) {

                         status = fieldStatus;

                     }

                 }

                         }

                 for(Section s: sections){

                     ErrorLevel subsectionStatus = s.processValidationResults(results,clearErrors);

                     if(subsectionStatus.getLevel() > status.getLevel()){

                             status = subsectionStatus;

                     }

                 }

                 }

         return status;

         }

         /**

          * Same as processValidationResults(results, true)

          * @see org.kuali.student.common.ui.client.configurable.mvc.sections.Section#processValidationResults(java.util.List)

          */

         @Override

         public ErrorLevel processValidationResults(List<ValidationResultInfo> results) {

                 return processValidationResults(results, true);

         }

         /**

          * Gets the defined controller for this section if one exists.

          * 

          * @see org.kuali.student.common.ui.client.configurable.mvc.HasLayoutController#getLayoutController()

          */

         @Override

         public LayoutController getLayoutController() {

                 return this.layoutController;

         }

         @Override

         public void setLayoutController(LayoutController controller) {

                 this.layoutController = controller;

         }

         /**

          * Use this to add widgets to a sections layout.  DO NOT use the add(Widget widget) call.

          * @see org.kuali.student.common.ui.client.configurable.mvc.sections.Section#addWidget(com.google.gwt.user.client.ui.Widget)

          */

         @Override

         public String addWidget(Widget w) {

                 return layout.addWidget(w);

         }

     /**

      * Sets the fields has had focus flag.  This flag is used for determining if the user has interacted with

      * any fields on the page or if the fields need to be assumed to have been interacted with.  Used for determining

      * when validation is necessary on a particular section.

      * @see org.kuali.student.common.ui.client.configurable.mvc.sections.Section#setFieldHasHadFocusFlags(boolean)

      */

     public void setFieldHasHadFocusFlags(boolean hadFocus) {

         for(FieldDescriptor f: fields){

             f.setHasHadFocus(hadFocus);

             if(f.getFieldWidget() instanceof MultiplicityComposite){

                                 MultiplicityComposite mc = (MultiplicityComposite) f.getFieldWidget();

                     for(MultiplicityItem item: mc.getItems()){

                             if(item.getItemWidget() instanceof Section && !item.isDeleted()){

                                     ((Section) item.getItemWidget()).setFieldHasHadFocusFlags(hadFocus);

                             }

                     }

             }else if(f.getFieldWidget() instanceof MultiplicityGroup){

                     MultiplicityGroup mg = (MultiplicityGroup) f.getFieldWidget();

                     for(MultiplicityGroupItem item: mg.getItems()){

                             if(item.getItemWidget() instanceof Section && !item.isDeleted()){

                                     ((Section) item.getItemWidget()).setFieldHasHadFocusFlags(hadFocus);

                             }

                     }

             }

         }

         for(Section s: sections){

             s.setFieldHasHadFocusFlags(hadFocus);

         }

     }

     /**

      * A section can turn off all validation by setting this flag

      * @see org.kuali.student.common.ui.client.configurable.mvc.sections.Section#enableValidation(boolean)

      */

     @Override

     public void enableValidation(boolean enableValidation) {

             this.isValidationEnabled = enableValidation;

     }

     @Override

     public boolean isValidationEnabled() {

                 return isValidationEnabled;

         }

         /**

          * Update the model passed in with data from the fields on this section.  This method will use the 

          * modelWidgetBinding defined in each of this sections fields to determine how to add this data to the

          * model.

          * @see org.kuali.student.common.ui.client.configurable.mvc.sections.Section#updateModel(org.kuali.student.common.ui.client.mvc.DataModel)

          */

         @Override

     public void updateModel(DataModel model){

         SectionBinding.INSTANCE.setModelValue(this, model, "");

     }

     /**

      * Updates the section's fields with data from the model passed in.  This effects all the data input and

      * display widgets on the particular section.  This method will use the 

          * modelWidgetBinding defined in each of this sections fields to determine how to interpret data from the

          * model and display it on the fields corresponding widget.

          * 

      * @see org.kuali.student.common.ui.client.configurable.mvc.sections.Section#updateWidgetData(org.kuali.student.common.ui.client.mvc.DataModel)

      */

     @Override

     public void updateWidgetData(DataModel model) {

         SectionBinding.INSTANCE.setWidgetValue(this, model, "");

     }

     /**

      * Resets all the dirty and focus flags on fields.

      * @see org.kuali.student.common.ui.client.configurable.mvc.sections.Section#resetFieldInteractionFlags()

      */

     @Override

     public void resetFieldInteractionFlags() {

             this.isDirty = false;

         for(FieldDescriptor f: fields){

             f.setDirty(false);

             f.setHasHadFocus(false);

         }

         for(Section s: sections){

             s.resetFieldInteractionFlags();

         }

     }

     @Override

     public void resetDirtyFlags() {

             this.isDirty = false;

         for(FieldDescriptor f: fields){

             f.setDirty(false);

         }

         for(Section s: sections){

             s.resetDirtyFlags();

         }

     }

         /**

          * Same as addSection except with an option user defined key (for retrieval of the section if necessary).

          * 

          * @see org.kuali.student.common.ui.client.configurable.mvc.sections.Section#addSection(java.lang.String, org.kuali.student.common.ui.client.configurable.mvc.sections.Section)

          */

         @Override

         public String addSection(String key, Section section) {

         sections.add(section);

         section.getLayout().setKey(key);

         String rkey = layout.addLayout(section.getLayout());

         return rkey;

         }

         @Override

         public FieldDescriptor getField(String fieldKey) {

                 for(FieldDescriptor f: fields){

                         if(f.getFieldKey().equals(fieldKey)){

                                 return f;

                         }

                 }

                 return null;

         }

         /**

          * Gets this sections fieldLayout.  The fieldLayout is used to determine how sections will layout the

          * ui and contains things such as the title and validation panels.

          * 

          * @see org.kuali.student.common.ui.client.configurable.mvc.sections.Section#getLayout()

          */

         @Override

         public FieldLayout getLayout() {

                 return layout;

         }

         @Override

         public Section getSection(String sectionKey) {

                 for(Section s: sections){

                         if(s.getLayout().getKey().equals(sectionKey)){

                                 return s;

                         }

                 }

                 return null;

         }

         @Override

         public void removeField(String fieldKey) {

                 int index = 0;

                 boolean found = false;

                 for(FieldDescriptor f: fields){

                         if(f.getFieldKey().equals(fieldKey)){

                                 index = fields.indexOf(f);

                                 found = true;

                                 break;

                         }

                 }

                 if(found){

                         fields.remove(index);

                 }

                 layout.removeLayoutElement(fieldKey);

         }

         @Override

         public void removeField(FieldDescriptor field) {

                 fields.remove(field);

                 layout.removeLayoutElement(field.getFieldKey());

         }

         @Override

         public void removeSection(String sectionKey) {

                 int index = 0;

                 boolean found = false;

                 for(Section s: sections){

                         if(s.getLayout().getKey().equals(sectionKey)){

                                 index = sections.indexOf(s);

                                 found = true;

                                 break;

                         }

                 }

                 if(found){

                         sections.remove(index);

                 }

                 layout.removeLayoutElement(sectionKey);

         }

         @Override

         public void removeWidget(Widget widget) {

                 layout.removeLayoutElement(widget);

         }

         @Override

         public void removeWidget(String key) {

                 layout.removeLayoutElement(key);

         }

         /**

          * Returns true if this this section is considered dirty (the user may have entered data into this

          * section)

          * 

          * @see org.kuali.student.common.ui.client.configurable.mvc.sections.Section#isDirty()

          */

         public boolean isDirty(){

                 if(!this.isDirty){

                         //Check child sections for dirtyness

                         for(Section s: sections){

                                 if(s.isDirty()){

                                         setIsDirty(true);

                                         break;

                                 }

                         }

                 }

                 return isDirty;

         }

     public void setIsDirty(boolean state) {

                 //Should this trust layoutController to be already set?

             if (layoutController == null){

                     layoutController = LayoutController.findParentLayout(layout);

             }

             if (isDirty != state){

                 isDirty = state;

                     if (layoutController != null && isDirty){

                             layoutController.fireApplicationEvent(new ContentDirtyEvent());

                     }

             }

     }

         /**

          * DO NOT use this method for adding sections, fields, or widgets to sections

          */

         @Override

         public void add(Widget w) {

                 super.add(w);

         }

         /**

          * Adds a style to this section's underlying layout.

          * @see com.google.gwt.user.client.ui.UIObject#addStyleName(java.lang.String)

          */

         @Override

         public void addStyleName(String style) {

                 layout.addStyleName(style);

         }

         @Override

         public void setStyleName(String style) {

                 layout.setStyleName(style);

         }

         /**

          * Sets instructions for this entire section (appears next to section title)

          * @param html

          */

         public void setInstructions(String html){

                 layout.setInstructions(html);

         }

         /**

          * Sets help for this entire section (appears next to section title)

          * @param html

          */

         public void setHelp(String html){

                 layout.setHelp(html);

         }

         /**

          * Sets required for this entire section (appears next to section title)

          * @param required

          */

         public void setRequired(AbbrPanel required){

                 layout.setRequired(required);

         }

         public void setSectionId(String id){

                 ((Widget)layout).getElement().setId(id);                

         }

 }