/*
    * 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.reference;
  
  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.solver.proj.ThemisSolverModule;
  import io.github.tonywasher.joceanus.themis.solver.proj.ThemisSolverProject;
  
  import java.util.List;
  
  /**
   * Button to select module from project.
   */
  public class ThemisUIRefModuleSelect
          implements OceanusEventProvider<TethysUIEvent>, TethysUIComponent {
      /**
       * The Event Manager.
       */
      private final OceanusEventManager<TethysUIEvent> theEventManager;
  
      /**
       * The scroll button.
       */
      private final TethysUIScrollButtonManager<ThemisSolverModule> theButton;
  
      /**
       * The module menu.
       */
      private final TethysUIScrollMenu<ThemisSolverModule> theModuleMenu;
  
      /**
       * The panel.
       */
      private final TethysUIBoxPaneManager thePanel;
  
      /**
       * The current project.
       */
      private ThemisSolverProject theProject;
  
      /**
       * The current module.
       */
      private ThemisSolverModule theModule;
  
      /**
       * Constructor.
       *
       * @param pFactory the factory
       */
      ThemisUIRefModuleSelect(final TethysUIFactory<?> pFactory) {
          /* Create Event Manager */
          theEventManager = new OceanusEventManager<>();
  
          /* Create the label */
          final TethysUIControlFactory myControls = pFactory.controlFactory();
          final TethysUILabel myPromptLabel = myControls.newLabel(ThemisUIResource.PROMPT_MODULE.getValue());
  
          /* Create the button */
          theButton = pFactory.buttonFactory().newScrollButton(ThemisSolverModule.class);
          theModuleMenu = 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 -> handleNewModule());
         theButton.setMenuConfigurator(e -> buildModuleMenu());
     }
 
     @Override
     public OceanusEventRegistrar<TethysUIEvent> getEventRegistrar() {
         return theEventManager.getEventRegistrar();
     }
 
     @Override
     public TethysUIComponent getUnderlying() {
         return thePanel;
     }
 
     /**
      * Obtain the current module.
      *
      * @return the current module
      */
     ThemisSolverModule getCurrentModule() {
         return theModule;
     }
 
     /**
      * Set the current project.
      *
      * @param pProject the current project
      */
     void setCurrentProject(final ThemisSolverProject pProject) {
         /* Store the project */
         theProject = pProject;
 
         /* Set the default module */
         final List<ThemisSolverModule> myModules = theProject == null ? null : theProject.getModules();
         final ThemisSolverModule myModule = (myModules == null || myModules.isEmpty()) ? null : myModules.getFirst();
         theButton.setValue(myModule);
         handleNewModule();
     }
 
     /**
      * Build the package menu.
      */
     private void buildModuleMenu() {
         /* Reset the popUp menu */
         theModuleMenu.removeAllItems();
 
         /* Record active item */
         TethysUIScrollItem<ThemisSolverModule> myActive = null;
         final ThemisSolverModule myCurr = theButton.getValue();
 
         /* Loop through the available modules */
         for (ThemisSolverModule myModule : theProject.getModules()) {
             /* Create a new MenuItem and add it to the popUp */
             final TethysUIScrollItem<ThemisSolverModule> myItem = theModuleMenu.addItem(myModule);
 
             /* If this is the active module */
             if (myModule.equals(myCurr)) {
                 /* Record it */
                 myActive = myItem;
             }
         }
 
         /* Ensure active item is visible */
         if (myActive != null) {
             myActive.scrollToItem();
         }
     }
 
     /**
      * Handle new Module.
      */
     private void handleNewModule() {
         /* Select the new module */
         theModule = theButton.getValue();
         theEventManager.fireEvent(TethysUIEvent.NEWVALUE);
     }
 }