/*******************************************************************************
    * Copyhacked (H) 2012-2025.
    * This program and the accompanying materials
    * are made available under no term at all, use it like
    * you want, but share and discuss it
    * every time possible with every body.
    * 
    * Contributors:
    *      ron190 at ymail dot com - initial implementation
   ******************************************************************************/
  package com.jsql.view.swing.list;
  
  import com.jsql.util.LogLevelUtil;
  import org.apache.commons.lang3.StringUtils;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  
  import javax.swing.*;
  import java.awt.datatransfer.DataFlavor;
  import java.awt.datatransfer.UnsupportedFlavorException;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Handler for processing cut/copy/paste/drag/drop action on a JList items.
   */
  public class ListTransfertHandler extends AbstractListTransfertHandler {
      
      private static final Logger LOGGER = LogManager.getRootLogger();
  
      @Override
      protected String initTransferable() {
          var stringTransferable = new StringBuilder();
          for (ItemList itemPath: this.dragPaths) {
              stringTransferable.append(itemPath).append("\n");
          }
          return stringTransferable.toString();
      }
  
      @Override
      protected void parseStringDrop(TransferSupport support, DnDList list, DefaultListModel<ItemList> listModel) {
          var dropLocation = (JList.DropLocation) support.getDropLocation();
          int childIndex = dropLocation.getIndex();
          List<Integer> listSelectedIndices = new ArrayList<>();
  
          // DnD from list
          if (this.dragPaths != null && !this.dragPaths.isEmpty()) {
              this.addFromList(listModel, childIndex, listSelectedIndices);
          } else {
              this.addFromOutside(support, listModel, childIndex, listSelectedIndices);
          }
  
          var selectedIndices = new int[listSelectedIndices.size()];
          var i = 0;
          for (Integer integer: listSelectedIndices) {
              selectedIndices[i] = integer;
              i++;
          }
          list.setSelectedIndices(selectedIndices);
      }
  
      private void addFromOutside(TransferSupport support, DefaultListModel<ItemList> listModel, int childIndexFrom, List<Integer> listSelectedIndices) {
          try {
              int childIndexTo = childIndexFrom;
              var importString = (String) support.getTransferable().getTransferData(DataFlavor.stringFlavor);
              for (String value: importString.split("\\n")) {
                  if (StringUtils.isNotEmpty(value)) {
                      listSelectedIndices.add(childIndexTo);
                      listModel.add(childIndexTo++, new ItemList(value.replace("\\", "/")));
                  }
              }
          } catch (UnsupportedFlavorException | IOException e) {
              LOGGER.log(LogLevelUtil.CONSOLE_JAVA, e, e);
          }
      }
  
      private void addFromList(DefaultListModel<ItemList> listModel, int childIndexFrom, List<Integer> listSelectedIndices) {
          int childIndexTo = childIndexFrom;
          for (ItemList value: this.dragPaths) {
              if (StringUtils.isNotEmpty(value.toString())) {
                  var newValue = new ItemList(value.toString().replace("\\", "/"));  //! FUUuu
                  listSelectedIndices.add(childIndexTo);
                  listModel.add(childIndexTo++, newValue);
              }
          }
      }
  
      @Override
      protected List<Integer> initStringPaste(String clipboardText, int selectedIndexFrom, DefaultListModel<ItemList> listModel) {
          int selectedIndexTo = selectedIndexFrom;
          List<Integer> selectedIndexes = new ArrayList<>();
          for (String line: clipboardText.split("\\n")) {
              if (StringUtils.isNotEmpty(line)) {
                  String newLine = line.replace("\\", "/");
                  var newItem = new ItemList(newLine);
                  selectedIndexes.add(selectedIndexTo);
                  listModel.add(selectedIndexTo++, newItem);
              }
         }
         return selectedIndexes;
     }
 }