/*
    * Themis: Java Project Framework
    * Copyright 2026. Tony Washer
    *
    * 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 io.github.tonywasher.joceanus.themis.gui.source;
  
  import io.github.tonywasher.joceanus.oceanus.event.OceanusEventManager;
  import io.github.tonywasher.joceanus.oceanus.event.OceanusEventRegistrar;
  import io.github.tonywasher.joceanus.oceanus.event.OceanusEventRegistrar.OceanusEventProvider;
  import io.github.tonywasher.joceanus.tethys.api.base.TethysUIComponent;
  import io.github.tonywasher.joceanus.tethys.api.base.TethysUIEvent;
  import io.github.tonywasher.joceanus.tethys.api.button.TethysUIScrollButtonManager;
  import io.github.tonywasher.joceanus.tethys.api.control.TethysUIControlFactory;
  import io.github.tonywasher.joceanus.tethys.api.control.TethysUILabel;
  import io.github.tonywasher.joceanus.tethys.api.factory.TethysUIFactory;
  import io.github.tonywasher.joceanus.tethys.api.menu.TethysUIScrollItem;
  import io.github.tonywasher.joceanus.tethys.api.menu.TethysUIScrollMenu;
  import io.github.tonywasher.joceanus.tethys.api.pane.TethysUIBoxPaneManager;
  import io.github.tonywasher.joceanus.tethys.api.pane.TethysUIPaneFactory;
  import io.github.tonywasher.joceanus.themis.gui.base.ThemisUIResource;
  import io.github.tonywasher.joceanus.themis.parser.proj.ThemisFile;
  import io.github.tonywasher.joceanus.themis.parser.proj.ThemisPackage;
  
  import java.util.List;
  
  /**
   * Button to select file from package.
   */
  public class ThemisUISourceFileSelect
          implements OceanusEventProvider<TethysUIEvent>, TethysUIComponent {
      /**
       * The Event Manager.
       */
      private final OceanusEventManager<TethysUIEvent> theEventManager;
  
      /**
       * The scroll button.
       */
      private final TethysUIScrollButtonManager<ThemisFile> theButton;
  
      /**
       * The file menu.
       */
      private final TethysUIScrollMenu<ThemisFile> theFileMenu;
  
      /**
       * The panel.
       */
      private final TethysUIBoxPaneManager thePanel;
  
      /**
       * The current package.
       */
      private ThemisPackage thePackage;
  
      /**
       * The current file.
       */
      private ThemisFile theFile;
  
      /**
       * Constructor.
       *
       * @param pFactory the factory
       */
      ThemisUISourceFileSelect(final TethysUIFactory<?> pFactory) {
          /* Create Event Manager */
          theEventManager = new OceanusEventManager<>();
  
          /* Create the label */
          final TethysUIControlFactory myControls = pFactory.controlFactory();
          final TethysUILabel myPromptLabel = myControls.newLabel(ThemisUIResource.PROMPT_FILE.getValue());
  
          /* Create the button */
          theButton = pFactory.buttonFactory().newScrollButton(ThemisFile.class);
          theFileMenu = theButton.getMenu();
  
          /* Create the panel */
          final TethysUIPaneFactory myPanes = pFactory.paneFactory();
          thePanel = myPanes.newHBoxPane();
          thePanel.addNode(myPromptLabel);
          thePanel.addNode(theButton);
  
          /* Set listeners */
          final OceanusEventRegistrar<TethysUIEvent> myRegistrar = theButton.getEventRegistrar();
          myRegistrar.addEventListener(TethysUIEvent.NEWVALUE, e -> handleNewFile());
         theButton.setMenuConfigurator(e -> buildFileMenu());
     }
 
     @Override
     public OceanusEventRegistrar<TethysUIEvent> getEventRegistrar() {
         return theEventManager.getEventRegistrar();
     }
 
     @Override
     public TethysUIComponent getUnderlying() {
         return thePanel;
     }
 
     /**
      * Obtain the current file.
      *
      * @return the current file
      */
     ThemisFile getCurrentFile() {
         return theFile;
     }
 
     /**
      * Set the current package.
      *
      * @param pPackage the current package
      */
     void setCurrentPackage(final ThemisPackage pPackage) {
         /* Store the package */
         thePackage = pPackage;
 
         /* Set the default file */
         final List<ThemisFile> myFiles = thePackage == null ? null : thePackage.getFiles();
         final ThemisFile myFile = (myFiles == null || myFiles.isEmpty()) ? null : myFiles.getFirst();
         theButton.setValue(myFile);
         handleNewFile();
     }
 
     /**
      * Build the file menu.
      */
     private void buildFileMenu() {
         /* Reset the popUp menu */
         theFileMenu.removeAllItems();
 
         /* Record active item */
         TethysUIScrollItem<ThemisFile> myActive = null;
         final ThemisFile myCurr = theButton.getValue();
 
         /* Loop through the available files */
         for (ThemisFile myFile : thePackage.getFiles()) {
             /* Create a new MenuItem and add it to the popUp */
             final TethysUIScrollItem<ThemisFile> myItem = theFileMenu.addItem(myFile);
 
             /* If this is the active file */
             if (myFile.equals(myCurr)) {
                 /* Record it */
                 myActive = myItem;
             }
         }
 
         /* Ensure active item is visible */
         if (myActive != null) {
             myActive.scrollToItem();
         }
     }
 
     /**
      * Handle new File.
      */
     private void handleNewFile() {
         /* Select the new file */
         theFile = theButton.getValue();
         theEventManager.fireEvent(TethysUIEvent.NEWVALUE);
     }
 }