/*
    * Copyright (c) 2002-2026 Gargoyle Software Inc.
    *
    * 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
    * https://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 org.htmlunit.html;
  
  import java.util.Map;
  
  import org.htmlunit.SgmlPage;
  import org.htmlunit.util.StringUtils;
  
  /**
   * Wrapper for the HTML element "input" where type is "range".
   *
   * @author Ahmed Ashour
   * @author Ronald Brill
   * @author Frank Danek
   * @author Anton Demydenko
   */
  public class HtmlRangeInput extends HtmlInput implements LabelableElement {
  
      /**
       * Creates an instance.
       *
       * @param qualifiedName the qualified name of the element type to instantiate
       * @param page the page that contains this element
       * @param attributes the initial attributes
       */
      HtmlRangeInput(final String qualifiedName, final SgmlPage page,
              final Map<String, DomAttr> attributes) {
          super(qualifiedName, page, attributes);
  
          final String value = getValueAttribute();
          if (value == ATTRIBUTE_NOT_DEFINED) {
              final double min = getMinNumeric();
              final double max = getMaxNumeric();
              if (max < min) {
                  setValue(min);
                  unmarkValueDirty();
                  return;
              }
  
              final double val = min + ((max - min) / 2);
              setValue(val);
              unmarkValueDirty();
          }
          else {
              setValue(value);
              unmarkValueDirty();
          }
      }
  
      /**
       * Returns the numeric value of the {@code min} attribute.
       *
       * @return the value of the {@code min} attribute as a {@code double}, or
       *         {@code 0} if the attribute is not defined or cannot be parsed
       */
      public double getMinNumeric() {
          final String min = getAttributeDirect("min");
          if (min == ATTRIBUTE_NOT_DEFINED) {
              return 0;
          }
          try {
              return Double.parseDouble(min);
          }
          catch (final NumberFormatException e) {
              return 0;
          }
      }
  
      /**
       * Returns the numeric value of the {@code max} attribute.
       *
       * @return the value of the {@code max} attribute as a {@code double}, or
       *         {@code 100} if the attribute is not defined or cannot be parsed
       */
      public double getMaxNumeric() {
          final String max = getAttributeDirect("max");
          if (max == ATTRIBUTE_NOT_DEFINED) {
              return 100;
          }
          try {
              return Double.parseDouble(max);
          }
          catch (final NumberFormatException e) {
              return 100;
          }
      }
 
     /**
      * Returns the numeric value of the {@code step} attribute.
      *
      * @return the value of the {@code step} attribute as a {@code double}, or
      *         {@code 1} if the attribute is not defined or cannot be parsed
      */
     public double getStepNumeric() {
         final String step = getAttributeDirect("step");
         if (step == ATTRIBUTE_NOT_DEFINED) {
             return 1;
         }
         try {
             return Double.parseDouble(step);
         }
         catch (final NumberFormatException e) {
             return 1;
         }
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void setDefaultChecked(final boolean defaultChecked) {
         // Empty.
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void setValue(final String newValue) {
         try {
             if (!StringUtils.isEmptyOrNull(newValue)) {
                 setValue(Double.parseDouble(newValue));
             }
             else {
                 final double min = getMinNumeric();
                 final double max = getMaxNumeric();
 
                 // place in the middle
                 setValue(min + ((max - min) / 2));
             }
         }
         catch (final NumberFormatException ignored) {
             // ignore
         }
     }
 
     private void setValue(final double newValue) {
         double value = newValue;
 
         final double min = getMinNumeric();
         final double max = getMaxNumeric();
 
         if (value > max) {
             value = max;
         }
         else {
             if (value < min) {
                 value = min;
             }
         }
 
         final double step = getStepNumeric();
         value = value - min;
         int fact = (int) (value / step);
         final double rest = value % step;
         if (rest >= step / 2) {
             fact++;
         }
         value = min + step * fact;
 
         if (!Double.isInfinite(value) && (value == Math.floor(value))) {
             super.setValue(Integer.toString((int) value));
         }
         else {
             super.setValue(Double.toString(value));
         }
     }
 
     @Override
     protected void valueAttributeChanged(final String attributeValue, final boolean isValueDirty) {
         if (isValueDirty) {
             return;
         }
 
         try {
             if (!org.htmlunit.util.StringUtils.isEmptyOrNull(attributeValue)) {
                 setRawValue(Double.parseDouble(attributeValue));
             }
             else {
                 final double min = getMinNumeric();
                 final double max = getMaxNumeric();
 
                 // place in the middle
                 setRawValue(min + ((max - min) / 2));
             }
         }
         catch (final NumberFormatException ignored) {
             // ignore
         }
     }
 
     private void setRawValue(final double newValue) {
         double value = newValue;
 
         final double min = getMinNumeric();
         final double max = getMaxNumeric();
 
         if (value > max) {
             value = max;
         }
         else {
             if (value < min) {
                 value = min;
             }
         }
 
         final double step = getStepNumeric();
         value = value - min;
         int fact = (int) (value / step);
         final double rest = value % step;
         if (rest >= step / 2) {
             fact++;
         }
         value = min + step * fact;
 
         if (!Double.isInfinite(value) && value == Math.floor(value)) {
             setRawValue(Integer.toString((int) value));
         }
         else {
             setRawValue(Double.toString(value));
         }
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     protected boolean isRequiredSupported() {
         return false;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean isValid() {
         return super.isValid() && isMaxValid() && isMinValid();
     }
 
     /**
      * Returns if the input element has a valid min value. Refer to the
      * <a href="https://www.w3.org/TR/html5/sec-forms.html">HTML 5</a>
      * documentation for details.
      *
      * @return if the input element has a valid min value
      */
     private boolean isMinValid() {
         if (!getRawValue().isEmpty() && !getMin().isEmpty()) {
             try {
                 final double value = Double.parseDouble(getRawValue());
                 return getMinNumeric() <= value;
             }
             catch (final NumberFormatException ignored) {
                 // ignore
             }
         }
         return true;
     }
 
     /**
      * Returns if the input element has a valid max value. Refer to the
      * <a href="https://www.w3.org/TR/html5/sec-forms.html">HTML 5</a>
      * documentation for details.
      *
      * @return if the input element has a valid max value
      */
     private boolean isMaxValid() {
         if (!getRawValue().isEmpty() && !getMax().isEmpty()) {
             try {
                 final int value = Integer.parseInt(getRawValue());
                 return getMaxNumeric() >= value;
             }
             catch (final NumberFormatException ignored) {
                 // ignore
             }
         }
         return true;
     }
 }