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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 com.jfoenix.skins;

import java.lang.reflect.Field;
import java.util.Arrays;

import com.jfoenix.adapters.ReflectionHelper;
import com.jfoenix.controls.JFXTextArea;

import javafx.geometry.Insets;
import javafx.scene.Node;
import javafx.scene.control.ScrollPane;
import javafx.scene.control.skin.TextAreaSkin;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.Region;
import javafx.scene.paint.Color;
import javafx.scene.text.Text;

/**
 * Material Design TextArea Skin
 *
 * @author Shadi Shaheen
 * @version 2.0
 * @since 2017-01-25
 */
public class JFXTextAreaSkin extends TextAreaSkin
{

   private boolean invalid = true;

   private ScrollPane scrollPane;
   private Text promptText;

   private ValidationPane errorContainer;
   private PromptLinesWrapper linesWrapper;

   public JFXTextAreaSkin(JFXTextArea textArea)
   {
      super(textArea);
      // init text area properties
      scrollPane = (ScrollPane) getChildren().get(0);
      textArea.setWrapText(true);

      linesWrapper = new PromptLinesWrapper<>(textArea, promptTextFillProperty(), textArea.textProperty(), textArea.promptTextProperty(), () -> promptText);

      linesWrapper.init(() -> createPromptNode(), scrollPane);
      errorContainer = new ValidationPane<>(textArea);
      getChildren().addAll(linesWrapper.line, linesWrapper.focusedLine, linesWrapper.promptContainer, errorContainer);

      registerChangeListener(textArea.disableProperty(), obs -> linesWrapper.updateDisabled());
      registerChangeListener(textArea.focusColorProperty(), obs -> linesWrapper.updateFocusColor());
      registerChangeListener(textArea.unFocusColorProperty(), obs -> linesWrapper.updateUnfocusColor());
      registerChangeListener(textArea.disableAnimationProperty(), obs -> errorContainer.updateClip());

   }

   @Override
   protected void layoutChildren(final double x, final double y, final double w, final double h)
   {
      super.layoutChildren(x, y, w, h);

      final double height = getSkinnable().getHeight();
      linesWrapper.layoutLines(x, y, w, h, height, promptText == null ? 0 : promptText.getLayoutBounds().getHeight() + 3);
      errorContainer.layoutPane(x, height + linesWrapper.focusedLine.getHeight(), w, h);
      linesWrapper.updateLabelFloatLayout();

      if (invalid)
      {
         invalid = false;
         // set the default background of text area viewport to white
         Region viewPort = (Region) scrollPane.getChildrenUnmodifiable().get(0);
         viewPort.setBackground(new Background(new BackgroundFill(Color.TRANSPARENT, CornerRadii.EMPTY, Insets.EMPTY)));
         // reapply css of scroll pane in case set by the user
         viewPort.applyCss();
         errorContainer.invalid(w);
         // focus
         linesWrapper.invalid();
      }
   }

   private void createPromptNode()
   {
      if (promptText != null || !linesWrapper.usePromptText.get())
      {
         return;
      }
      promptText = new Text();
      promptText.setManaged(false);
      promptText.getStyleClass().add("text");
      promptText.visibleProperty().bind(linesWrapper.usePromptText);
      promptText.fontProperty().bind(getSkinnable().fontProperty());
      promptText.textProperty().bind(getSkinnable().promptTextProperty());
      promptText.fillProperty().bind(linesWrapper.animatedPromptTextFill);
      promptText.setLayoutX(1);
      promptText.setTranslateX(1);
      promptText.getTransforms().add(linesWrapper.promptTextScale);
      linesWrapper.promptContainer.getChildren().add(promptText);
      if (getSkinnable().isFocused() && ((JFXTextArea) getSkinnable()).isLabelFloat())
      {
         promptText.setTranslateY(-Math.floor(scrollPane.getHeight()));
         linesWrapper.promptTextScale.setX(0.85);
         linesWrapper.promptTextScale.setY(0.85);
      }

      try
      {
         Field field = ReflectionHelper.getField(TextAreaSkin.class, "promptNode");
         Object oldValue = field.get(this);
         if (oldValue != null)
         {
            removeHighlight(Arrays.asList(((Node) oldValue)));
         }
         field.set(this, promptText);
      }
      catch (Exception e)
      {
         e.printStackTrace();
      }
   }
}