/**
    * Copyright 2005-2013 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.web.form;
  
  import org.apache.commons.lang.StringUtils;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.codehaus.jackson.map.ObjectMapper;
  import org.kuali.rice.krad.service.KRADServiceLocatorWeb;
  import org.kuali.rice.krad.uif.UifConstants;
  import org.kuali.rice.krad.uif.UifParameters;
  import org.kuali.rice.krad.uif.view.History;
  import org.kuali.rice.krad.uif.view.HistoryEntry;
  import org.kuali.rice.krad.uif.view.View;
  import org.kuali.rice.krad.uif.service.ViewService;
  import org.kuali.rice.krad.uif.view.ViewModel;
  import org.kuali.rice.krad.util.KRADUtils;
  import org.springframework.web.multipart.MultipartFile;
  import org.kuali.rice.krad.uif.UifConstants.ViewType;
  
  import javax.servlet.http.HttpServletRequest;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Properties;
  import java.util.Set;
  import java.util.UUID;
  
  /**
   * Base form class for views within the KRAD User Interface Framework
   *
   * <p>
   * Holds properties necessary to determine the <code>View</code> instance that
   * will be used to render the UI
   * </p>
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class UifFormBase implements ViewModel {
      private static final long serialVersionUID = 8432543267099454434L;
  
      // logger
      private static final Log LOG = LogFactory.getLog(UifFormBase.class);
  
      // current view
      protected String viewId;
      protected String viewName;
      protected ViewType viewTypeName;
      protected String pageId;
      protected String methodToCall;
      protected String formKey;
      protected String jumpToId;
      protected String jumpToName;
      protected String focusId;
      protected String formPostUrl;
  
      protected boolean defaultsApplied;
      protected boolean skipViewInit;
  
      protected View view;
      protected View postedView;
  
      protected Map<String, String> viewRequestParameters;
      protected List<String> readOnlyFieldsList;
  
      protected Map<String, Object> newCollectionLines;
      protected Map<String, String> actionParameters;
      protected Map<String, Object> clientStateForSyncing;
      protected Map<String, Set<String>> selectedCollectionLines;
  
      protected MultipartFile attachmentFile;
  
      // navigation
      protected String returnLocation;
      protected String returnFormKey;
  
      protected History formHistory;
  
      protected boolean renderFullView;
      protected boolean validateDirty;
  
      public UifFormBase() {
          formKey = generateFormKey();
          renderFullView = true;
         defaultsApplied = false;
         skipViewInit = false;
 
         formHistory = new History();
 
         readOnlyFieldsList = new ArrayList<String>();
         viewRequestParameters = new HashMap<String, String>();
         newCollectionLines = new HashMap<String, Object>();
         actionParameters = new HashMap<String, String>();
         clientStateForSyncing = new HashMap<String, Object>();
         selectedCollectionLines = new HashMap<String, Set<String>>();
     }
 
     /**
      * Creates the unique id used to store this "conversation" in the session.
      * The default method generates a java UUID.
      *
      * @return
      */
     protected String generateFormKey() {
         return UUID.randomUUID().toString();
     }
 
     /**
      * Called after Spring binds the request to the form and before the
      * controller method is invoked.
      *
      * @param request - request object containing the query parameters
      */
     public void postBind(HttpServletRequest request) {
         // default form post URL to request URL
         formPostUrl = request.getRequestURL().toString();
 
         // get any sent client view state and parse into map
         if (request.getParameterMap().containsKey(UifParameters.CLIENT_VIEW_STATE)) {
             String clientStateJSON = request.getParameter(UifParameters.CLIENT_VIEW_STATE);
             if (StringUtils.isNotBlank(clientStateJSON)) {
                 // change single quotes to double quotes (necessary because the reverse was done for sending)
                 clientStateJSON = StringUtils.replace(clientStateJSON, "'", "\"");
 
                 ObjectMapper mapper = new ObjectMapper();
                 try {
                     clientStateForSyncing = mapper.readValue(clientStateJSON, Map.class);
                 } catch (IOException e) {
                     throw new RuntimeException("Unable to decode client side state JSON", e);
                 }
             }
         }
 
         // populate read only fields list
         if (request.getParameter(UifParameters.READ_ONLY_FIELDS) != null) {
             String readOnlyFields = request.getParameter(UifParameters.READ_ONLY_FIELDS);
             setReadOnlyFieldsList(KRADUtils.convertStringParameterToList(readOnlyFields));
         }
 
         // reset skip view init parameter if not passed
         if (!request.getParameterMap().containsKey(UifParameters.SKIP_VIEW_INIT)) {
             skipViewInit = false;
         }
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#getViewId()
      */
     public String getViewId() {
         return this.viewId;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#setViewId(java.lang.String)
      */
     public void setViewId(String viewId) {
         this.viewId = viewId;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#getViewName()
      */
     public String getViewName() {
         return this.viewName;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#setViewName(java.lang.String)
      */
     public void setViewName(String viewName) {
         this.viewName = viewName;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#getViewTypeName()
      */
     public ViewType getViewTypeName() {
         return this.viewTypeName;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#setViewTypeName(org.kuali.rice.krad.uif.UifConstants.ViewType)
      */
     public void setViewTypeName(ViewType viewTypeName) {
         this.viewTypeName = viewTypeName;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#getPageId()
      */
     public String getPageId() {
         return this.pageId;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#setPageId(java.lang.String)
      */
     public void setPageId(String pageId) {
         this.pageId = pageId;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#getFormPostUrl()
      */
     public String getFormPostUrl() {
         return this.formPostUrl;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#setFormPostUrl(java.lang.String)
      */
     public void setFormPostUrl(String formPostUrl) {
         this.formPostUrl = formPostUrl;
     }
 
     public String getReturnLocation() {
         return this.returnLocation;
     }
 
     public void setReturnLocation(String returnLocation) {
         this.returnLocation = returnLocation;
     }
 
     public String getReturnFormKey() {
         return this.returnFormKey;
     }
 
     public void setReturnFormKey(String returnFormKey) {
         this.returnFormKey = returnFormKey;
     }
 
     /**
      * Identifies the controller method that should be invoked to fulfill a
      * request. The value will be matched up against the 'params' setting on the
      * <code>RequestMapping</code> annotation for the controller method
      *
      * @return String method to call
      */
     public String getMethodToCall() {
         return this.methodToCall;
     }
 
     /**
      * Setter for the method to call
      *
      * @param methodToCall
      */
     public void setMethodToCall(String methodToCall) {
         this.methodToCall = methodToCall;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#getViewRequestParameters()
      */
     public Map<String, String> getViewRequestParameters() {
         return this.viewRequestParameters;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#setViewRequestParameters(java.util.Map<java.lang.String,java.lang.String>)
      */
     public void setViewRequestParameters(Map<String, String> viewRequestParameters) {
         this.viewRequestParameters = viewRequestParameters;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#getReadOnlyFieldsList()
      */
     public List<String> getReadOnlyFieldsList() {
         return readOnlyFieldsList;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#setReadOnlyFieldsList(java.util.List<java.lang.String>)
      */
     public void setReadOnlyFieldsList(List<String> readOnlyFieldsList) {
         this.readOnlyFieldsList = readOnlyFieldsList;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#getNewCollectionLines()
      */
     public Map<String, Object> getNewCollectionLines() {
         return this.newCollectionLines;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#setNewCollectionLines(java.util.Map<java.lang.String,java.lang.Object>)
      */
     public void setNewCollectionLines(Map<String, Object> newCollectionLines) {
         this.newCollectionLines = newCollectionLines;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#getActionParameters()
      */
     public Map<String, String> getActionParameters() {
         return this.actionParameters;
     }
 
     /**
      * Returns the action parameters map as a <code>Properties</code> instance
      *
      * @return Properties action parameters
      */
     public Properties getActionParametersAsProperties() {
         return KRADUtils.convertMapToProperties(actionParameters);
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#setActionParameters(java.util.Map<java.lang.String,java.lang.String>)
      */
     public void setActionParameters(Map<String, String> actionParameters) {
         this.actionParameters = actionParameters;
     }
 
     /**
      * Retrieves the value for the given action parameter, or empty string if
      * not found
      *
      * @param actionParameterName - name of the action parameter to retrieve value for
      * @return String parameter value or empty string
      */
     public String getActionParamaterValue(String actionParameterName) {
         if ((actionParameters != null) && actionParameters.containsKey(actionParameterName)) {
             return actionParameters.get(actionParameterName);
         }
 
         return "";
     }
 
     /**
      * Returns the action event that was sent in the action parameters (if any)
      *
      * <p>
      * The action event is a special action parameter that can be sent to indicate a type of action being taken. This
      * can be looked at by the view or components to render differently
      * </p>
      *
      * TODO: make sure action parameters are getting reinitialized on each request
      *
      * @return String action event name or blank if action event was not sent
      */
     public String getActionEvent() {
         if ((actionParameters != null) && actionParameters.containsKey(UifConstants.UrlParams.ACTION_EVENT)) {
             return actionParameters.get(UifConstants.UrlParams.ACTION_EVENT);
         }
 
         return "";
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#getClientStateForSyncing()
      */
     public Map<String, Object> getClientStateForSyncing() {
         return clientStateForSyncing;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#getSelectedCollectionLines()
      */
     public Map<String, Set<String>> getSelectedCollectionLines() {
         return selectedCollectionLines;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#setSelectedCollectionLines(java.util.Map<java.lang.String,java.util.Set<java.lang.String>>)
      */
     public void setSelectedCollectionLines(Map<String, Set<String>> selectedCollectionLines) {
         this.selectedCollectionLines = selectedCollectionLines;
     }
 
     /**
      * Key string that identifies the form instance in session storage
      *
      * <p>
      * When the view is posted, the previous form instance is retrieved and then
      * populated from the request parameters. This key string is retrieve the
      * session form from the session service
      * </p>
      *
      * @return String form session key
      */
     public String getFormKey() {
         return this.formKey;
     }
 
     /**
      * Setter for the form's session key
      *
      * @param formKey
      */
     public void setFormKey(String formKey) {
         this.formKey = formKey;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#isDefaultsApplied()
      */
     public boolean isDefaultsApplied() {
         return this.defaultsApplied;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#setDefaultsApplied(boolean)
      */
     public void setDefaultsApplied(boolean defaultsApplied) {
         this.defaultsApplied = defaultsApplied;
     }
 
     /**
      * Indicates whether a new view is being initialized or the call is refresh (or query) call
      *
      * @return boolean true if view initialization was skipped, false if new view is being created
      */
     public boolean isSkipViewInit() {
         return skipViewInit;
     }
 
     /**
      * Setter for the skip view initialization flag
      *
      * @param skipViewInit
      */
     public void setSkipViewInit(boolean skipViewInit) {
         this.skipViewInit = skipViewInit;
     }
 
     /**
      * Holder for files that are attached through the view
      *
      * @return MultipartFile representing the attachment
      */
     public MultipartFile getAttachmentFile() {
         return this.attachmentFile;
     }
 
     /**
      * Setter for the form's attachment file
      *
      * @param attachmentFile
      */
     public void setAttachmentFile(MultipartFile attachmentFile) {
         this.attachmentFile = attachmentFile;
     }
 
     /**
      * @return the renderFullView
      */
     public boolean isRenderFullView() {
         return this.renderFullView;
     }
 
     /**
      * @param renderFullView
      */
     public void setRenderFullView(boolean renderFullView) {
         this.renderFullView = renderFullView;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#getView()
      */
     public View getView() {
         return this.view;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#setView(org.kuali.rice.krad.uif.view.View)
      */
     public void setView(View view) {
         this.view = view;
         initHomewardPathList();
     }
 
     /**
      * Set the "Home" url of the homewardPathList (ie. breadcrumbs history)
      */
     private void initHomewardPathList() {
         if (getReturnLocation() == null) {
             LOG.warn("Could not init homewardPathList.  returnLocation is null.");
             return;
         }
 
         List<HistoryEntry> homewardPathList = new ArrayList<HistoryEntry>();
         if ((view != null) && (view.getBreadcrumbs() != null) && (view.getBreadcrumbs().getHomewardPathList() != null)) {
             homewardPathList = view.getBreadcrumbs().getHomewardPathList();
         }
 
         HistoryEntry historyEntry = new HistoryEntry("","","Home",getReturnLocation(),"");
         if (homewardPathList.isEmpty()) {
             homewardPathList.add(historyEntry);
         } else if (StringUtils.equals(homewardPathList.get(0).getTitle(), "Home")) {
             homewardPathList.set(0, historyEntry);
         } else {
             homewardPathList.add(0, historyEntry);
         }
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#getPostedView()
      */
     public View getPostedView() {
         return this.postedView;
     }
 
     /**
      * @see org.kuali.rice.krad.uif.view.ViewModel#setPostedView(org.kuali.rice.krad.uif.view.View)
      */
     public void setPostedView(View postedView) {
         this.postedView = postedView;
     }
 
     /**
      * Instance of the <code>ViewService</code> that can be used to retrieve
      * <code>View</code> instances
      *
      * @return ViewService implementation
      */
     protected ViewService getViewService() {
         return KRADServiceLocatorWeb.getViewService();
     }
 
     /**
      * The jumpToId for this form, the element with this id will be jumped to automatically
      * when the form is loaded in the view.
      * Using "TOP" or "BOTTOM" will jump to the top or the bottom of the resulting page.
      * jumpToId always takes precedence over jumpToName, if set.
      *
      * @return the jumpToId
      */
     public String getJumpToId() {
         return this.jumpToId;
     }
 
     /**
      * @param jumpToId the jumpToId to set
      */
     public void setJumpToId(String jumpToId) {
         this.jumpToId = jumpToId;
     }
 
     /**
      * The jumpToName for this form, the element with this name will be jumped to automatically
      * when the form is loaded in the view.
      * WARNING: jumpToId always takes precedence over jumpToName, if set.
      *
      * @return the jumpToName
      */
     public String getJumpToName() {
         return this.jumpToName;
     }
 
     /**
      * @param jumpToName the jumpToName to set
      */
     public void setJumpToName(String jumpToName) {
         this.jumpToName = jumpToName;
     }
 
     /**
      * Field to place focus on when the page loads
      * An empty focusId will result in focusing on the first visible input element by default.
      *
      * @return the focusId
      */
     public String getFocusId() {
         return this.focusId;
     }
 
     /**
      * @param focusId the focusId to set
      */
     public void setFocusId(String focusId) {
         this.focusId = focusId;
     }
 
     /**
      * History parameter representing the History of views that have come before the
      * viewing of the current view
      *
      * <p>
      * Used for breadcrumb widget generation on the view and also for navigating back
      * to previous or hub locations
      * </p>
      *
      * @return History instance giving current history
      */
     public History getFormHistory() {
         return formHistory;
     }
 
     /**
      * Setter for the current History object
      *
      * @param history the history to set
      */
     public void setFormHistory(History history) {
         this.formHistory = history;
     }
 
     /**
      * Indicates whether the form should be validated for dirtyness
      *
      * <p>
      * For FormView, it's necessary to validate when the user tries to navigate out of the form. If set, all the
      * InputFields will be validated on refresh, navigate, cancel or close Action or on form
      * unload and if dirty, displays a message and user can decide whether to continue with
      * the action or stay on the form
      * </p>
      *
      * @return boolean true if dirty validation should be enabled
      */
     public boolean isValidateDirty() {
         return this.validateDirty;
     }
 
     /**
      * Setter for dirty validation indicator
      *
      * @param validateDirty
      */
     public void setValidateDirty(boolean validateDirty) {
         this.validateDirty = validateDirty;
     }
 
 }