import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.Stage;
import javafx.scene.text.TextAlignment;
import javafx.scene.text.Font;
import javafx.geometry.Pos;
import javafx.geometry.Insets;
import javafx.scene.layout.Border;
import javafx.scene.layout.BorderStroke;
import javafx.scene.layout.BorderStrokeStyle;
import javafx.scene.layout.BorderWidths;
import javafx.scene.paint.Color;


import javafx.application.Platform;

import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.event.Event;

import javafx.beans.value.*;  // ChangeListener
import javafx.collections.*;

import javafx.geometry.HPos;

import javafx.collections.*;


public class UIBspListView03 extends Application  {

   class PunkteCell extends ListCell<Double> {

       @Override 
       protected void updateItem(Double item, boolean empty) {
           super.updateItem(item, empty);
           if (item!=null && !empty) {
             setText(item.toString()+" Pkt");
             if (item<50)
                 setTextFill(Color.RED);
             else
                 setTextFill(Color.BLUE);
           }
           else {
             setText("--");
             setTextFill(Color.BLACK);
           }
       }
   }  // class PunkteCell

    private final ObservableList<Double> listePunkte = FXCollections.observableArrayList();
    
        
    
    private ListView<Double> listviewPunkte = new ListView<>() ;
    private TextField tInput = new TextField("") ;
    private  Button bnInsert = new Button("Punkteeingabe") ;

    private Button bnEdit = new Button("Edit");
    private Button bnDelete = new Button("Delete");
    private Button bnDeleteAll = new Button("DeleteAll");

    private  Button bnSave = new Button("Save") ;
    private  Button bnEsc = new Button("Esc") ;

    
     @Override 
     public void start(Stage stage) {
            BorderPane borderpane = new BorderPane();

            Pane pane1 = createTextInputControl(tInput,bnInsert, "Eingabe");
            borderpane.setTop(pane1);
            bnInsert.setOnAction(e->insertPunkte());


            listviewPunkte.setItems(listePunkte );
            listviewPunkte.setPlaceholder(new Label("Bitte etwas auswaehlen"));
            listviewPunkte.setStyle("-fx-font: 22px \"Serif\";");

            listviewPunkte.setCellFactory((param) -> {  
                return new PunkteCell();
            });

            listviewPunkte.setOnMouseClicked(e->listviewOnClick());

            Pane pane = createListView(listviewPunkte , "Punktliste",bnEdit, bnDelete, bnDeleteAll);
            borderpane.setCenter(pane);
            listviewPunkte.getSelectionModel().selectedIndexProperty().addListener(
                new ChangeListener<Number>() {
                  @Override
                   public void changed(
                      ObservableValue<? extends Number> observableValue, Number number, Number number2) {
                       showlistviewPunkte(number2);
                   }
           });
            bnEdit.setOnAction((ActionEvent e)->editSeletedItem());
            bnDelete.setOnAction((ActionEvent e)->deleteSeletedItem());
            bnDeleteAll.setOnAction(e->deleteAllItems());

            Pane boxpane = getBottom();
            borderpane.setBottom(boxpane);
            borderpane.setMargin(boxpane, new Insets(0, 0, 10, 0) );  // TRBL

            Scene scene= new Scene(borderpane, 660, 600);
            stage.setTitle("UIBspListView03");        
            stage.setScene(scene);        
            stage.show();  
    }

  


     private Pane createTextInputControl(TextInputControl control, Button bn, String caption) {
            HBox hbox = new HBox(22);    
            hbox.setFillHeight(true);
            hbox.setMaxWidth(Double.POSITIVE_INFINITY);

            Label label = new Label(caption) ;
            label.setFont(new Font("Courier New",22));
            hbox.getChildren().add(label);
            hbox.setMargin(label, new Insets(5, 0, 0, 10) );  // TRBL


            control.setFont(new Font("Courier New",22));
            control.setMaxWidth(Double.POSITIVE_INFINITY);
            hbox.getChildren().add(control);
            hbox.setHgrow(control, Priority.ALWAYS);
            hbox.setMargin(control, new Insets(0, 10, 0, 10) );  // TRBL

            bn.setFont(new Font("Courier New",22));
            hbox.getChildren().add(bn);
            hbox.setMargin(bn, new Insets(5, 10, 0, 10) );  // TRBL

            return hbox;
     }
     
     private Pane createListView(ListView control, String caption, Button bnEdit, Button bnDelete, Button bnDeleteAll) {
            VBox vboxparent = new VBox(22);    
            vboxparent.setFillWidth(true);
            vboxparent.setMaxHeight(Double.POSITIVE_INFINITY);

            Label label = new Label(caption) ;
            label.setFont(new Font("Courier New",22));
            vboxparent.getChildren().add(label);
            vboxparent.setMargin(label, new Insets(20, 0, 0, 10) );  // TRBL

            HBox hbox = new HBox(22);    
            hbox.setFillHeight(true);
            hbox.setMaxWidth(Double.POSITIVE_INFINITY);

            // control.setFont(new Font("Courier New",22));  // gibt es nicht ??
            control.setMaxWidth(Double.POSITIVE_INFINITY);
            hbox.getChildren().add(control);
            hbox.setHgrow(control, Priority.ALWAYS);
            hbox.setMargin(control, new Insets(-20, 10, 10, 10) );  // TRBL


            VBox vbox = new VBox(22);    
            vbox.setFillWidth(true);
            vbox.setMaxHeight(Double.POSITIVE_INFINITY);
            hbox.getChildren().add(vbox);


            bnEdit.setFont(new Font("Courier New",22));
            vbox.getChildren().add(bnEdit);
            vbox.setMargin(bnEdit, new Insets(5, 0, 0, 10) );  // TRBL
            bnEdit.setAlignment(Pos.CENTER); //BASELINE_RIGHT);


            bnDelete.setFont(new Font("Courier New",22));
            vbox.getChildren().add(bnDelete);
            vbox.setMargin(bnDelete, new Insets(5, 0, 0, 10) );  // TRBL
            bnDelete.setAlignment(Pos.CENTER); //BASELINE_RIGHT);

            bnDeleteAll.setFont(new Font("Courier New",22));
            vbox.getChildren().add(bnDeleteAll);
            vbox.setMargin(bnDeleteAll, new Insets(5, 0, 0, 10) );  // TRBL
            bnDeleteAll.setAlignment(Pos.CENTER);

            vboxparent.getChildren().add(hbox);

            // ---------------------------------------
            return vboxparent;
     }

     private Pane createButtonBase(ButtonBase control) {
            HBox hbox = new HBox(22);    
            hbox.setFillHeight(true);
            hbox.setMaxWidth(Double.POSITIVE_INFINITY);

            control.setFont(new Font("Courier New",22));
            control.setMaxWidth(Double.POSITIVE_INFINITY);
            hbox.getChildren().add(control);
            hbox.setHgrow(control, Priority.ALWAYS);
            hbox.setMargin(control, new Insets(0, 10, 0, 10) );  // TRBL
            return hbox;
     }
     
    private Pane getBottom() {

            FlowPane boxpane = new FlowPane(20,20);    
            boxpane.setAlignment(Pos.CENTER);
            boxpane.setMaxWidth(Double.POSITIVE_INFINITY);

            bnSave.setFont(new Font("Courier New",22));            
            bnSave.setMaxWidth(Double.POSITIVE_INFINITY);
            bnSave.setOnAction(e->saveData());
            boxpane.getChildren().add(bnSave);
            boxpane.setMargin(bnSave, new Insets(0, 10, 0, 10) );  // TRBL

            bnEsc.setFont(new Font("Courier New",22));            
            bnEsc.setMaxWidth(Double.POSITIVE_INFINITY);
            bnEsc.setOnAction(e->Platform.exit());
            boxpane.getChildren().add(bnEsc);
            boxpane.setMargin(bnEsc, new Insets(0, 10, 0, 10) );  // TRBL
            return boxpane;
   }


 private void listviewOnClick() {
    System.out.println("listviewOnClick()");
//    int index = listviewPunkte.getSelectionModel().getSelectedIndex();
  //  errorBox(Integer.toString(index),"Hinweis");
   }


    private void editSeletedItem() {
       int index = listviewPunkte.getSelectionModel().getSelectedIndex();
       if (index>=0 && index<listePunkte.size()) {
          Double pkt = listePunkte.get(index);
          System.out.println(pkt.toString());
          String str_pkt = insertString("Bitte den neuen Wert eingeben", "Punkt ändern", Double.toString(pkt));
          if (str_pkt!=null) {
             double pktNeu = getDoubleNumber(str_pkt);
             if (!Double.isNaN(pktNeu)) {
                 listePunkte.set(index,pktNeu);
             }
          }
       }
      else {
        errorBox("Bitte einen Eintrag selektieren","Hinweis");
      }
   }

    private void  deleteSeletedItem() {
       int index = listviewPunkte.getSelectionModel().getSelectedIndex();
       ObservableList<Double> selectedItems = listviewPunkte.getSelectionModel().getSelectedItems();
      listePunkte.remove(index);
    }

    private void  deleteAllItems() {
      listePunkte.clear();
    }
      

    double getDoubleNumber(String str_zahl) {
	try {
		double zahl = Double.parseDouble(str_zahl);
		return zahl;
	}
	catch (NumberFormatException e) {
		return Double.NaN;
	}  // try
      }  // getDoubleNumber      


    private void insertPunkte() {
       String str_pkt = tInput.getText().trim();
       if (str_pkt.length()==0) {
         errorBox( "Bitte geben Sie eine Punktzahl ein","Hinweis");
         tInput.requestFocus();
       }
       else {
         double pkt = getDoubleNumber(str_pkt);
         if (Double.isNaN(pkt)) {
             errorBox("Die Punkteingabe ist keine Zahl","Hinweis");
             tInput.requestFocus();
         }
         else {
            //listePunkte.addAll(pkt);
            listviewPunkte.getItems().add(pkt);
            tInput.setText("");
            tInput.requestFocus();
         }
       }
    } // insertPunkte

    private void showlistviewPunkte(Number index) {
        System.out.println("listviewPunkte:  index: "+ index);
    }

    private void saveData() {

       StringBuilder sb = new StringBuilder(100);
       ObservableList<Double> selectedItems = listviewPunkte.getItems();
       for (Double pkt : selectedItems) {
            sb.append( Double.toString(pkt) );
            sb.append(" , ");
       }
       sb.append(":  ");
    System.out.println(sb.toString());

//      tErg.setText(sb.toString());

      }

    private String insertString(String message, String title, String vorgabe) {
     TextInputDialog dialog = new TextInputDialog(vorgabe);
      dialog.setTitle(title);
      dialog.setContentText(message);
      dialog.setHeaderText(title);
      dialog.setResizable(true);
      java.util.Optional<String> result = dialog.showAndWait();

      if (result.isPresent()) {
            return (String)result.get();
      }
      else {
         return null; 
      }
    }

     private void errorBox( String message, String title) {
         Dialog alert = new Alert(Alert.AlertType.ERROR,message);
         alert.setTitle(title);
         alert.setHeaderText(title);
         alert.setResizable(true);
         alert.show();
//        a.setContentText(content);
      } // ErrorBox


// INFORMATION  CONFIRMATION  ERROR  NONE WARNING


      public static void main(String[] argv) {       
              launch(argv);   
      } 
}