/**
    * Copyright (C) 2014-2016 Philip Helger (www.helger.com)
    * philip[at]helger[dot]com
    *
    * 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 com.helger.schematron.pure.model;
  
  import java.util.Map;
  
  import javax.annotation.Nonnull;
  import javax.annotation.Nullable;
  import javax.annotation.concurrent.NotThreadSafe;
  
  import com.helger.commons.ValueEnforcer;
  import com.helger.commons.annotation.Nonempty;
  import com.helger.commons.annotation.ReturnsMutableCopy;
  import com.helger.commons.collection.CollectionHelper;
  import com.helger.commons.collection.ext.CommonsArrayList;
  import com.helger.commons.collection.ext.CommonsLinkedHashMap;
  import com.helger.commons.collection.ext.ICommonsList;
  import com.helger.commons.collection.ext.ICommonsOrderedMap;
  import com.helger.commons.id.IHasID;
  import com.helger.commons.lang.EnumHelper;
  import com.helger.commons.string.StringHelper;
  import com.helger.commons.string.ToStringGenerator;
  import com.helger.schematron.CSchematron;
  import com.helger.schematron.CSchematronXML;
  import com.helger.schematron.pure.errorhandler.IPSErrorHandler;
  import com.helger.xml.microdom.IMicroElement;
  import com.helger.xml.microdom.MicroElement;
  
  /**
   * A single Schematron dir-element.<br>
   * A section of natural-language text with a direction specified by the value
   * attribute. The value ltr indicates left-to-right text; the value rtl
   * indicates right-to-left text.<br>
   * An implementation is not required to make use of this element.
   *
   * @author Philip Helger
   */
  @NotThreadSafe
  public class PSDir implements IPSClonableElement <PSDir>, IPSOptionalElement, IPSHasForeignElements, IPSHasTexts
  {
    public static enum EDirValue implements IHasID <String>
    {
      LTR ("ltr"),
      RTL ("rtl");
  
      private final String m_sID;
  
      private EDirValue (@Nonnull @Nonempty final String sID)
      {
        m_sID = sID;
      }
  
      @Nonnull
      @Nonempty
      public String getID ()
      {
        return m_sID;
      }
  
      @Nullable
      public static EDirValue getFromIDOrNull (@Nullable final String sID)
      {
        return EnumHelper.getFromIDOrNull (EDirValue.class, sID);
      }
    }
  
    private EDirValue m_eValue;
    private final ICommonsList <String> m_aContent = new CommonsArrayList <> ();
    private ICommonsOrderedMap <String, String> m_aForeignAttrs;
    private ICommonsList <IMicroElement> m_aForeignElements;
  
    public PSDir ()
    {}
  
    public boolean isValid (@Nonnull final IPSErrorHandler aErrorHandler)
    {
      if (m_aContent.isEmpty ())
      {
        aErrorHandler.error (this, "<dir> has no content");
        return false;
      }
      return true;
    }
  
    public void validateCompletely (@Nonnull final IPSErrorHandler aErrorHandler)
   {
     if (m_aContent.isEmpty ())
       aErrorHandler.error (this, "<dir> has no content");
   }
 
   public boolean isMinimal ()
   {
     return true;
   }
 
   public void addForeignElement (@Nonnull final IMicroElement aForeignElement)
   {
     ValueEnforcer.notNull (aForeignElement, "ForeignElement");
     if (aForeignElement.hasParent ())
       throw new IllegalArgumentException ("ForeignElement already has a parent!");
     if (m_aForeignElements == null)
       m_aForeignElements = new CommonsArrayList <> ();
     m_aForeignElements.add (aForeignElement);
   }
 
   public boolean hasForeignElements ()
   {
     return m_aForeignElements != null && m_aForeignElements.isNotEmpty ();
   }
 
   @Nonnull
   @ReturnsMutableCopy
   public ICommonsList <IMicroElement> getAllForeignElements ()
   {
     return new CommonsArrayList <> (m_aForeignElements);
   }
 
   public void addForeignAttribute (@Nonnull final String sAttrName, @Nonnull final String sAttrValue)
   {
     ValueEnforcer.notNull (sAttrName, "AttrName");
     ValueEnforcer.notNull (sAttrValue, "AttrValue");
     if (m_aForeignAttrs == null)
       m_aForeignAttrs = new CommonsLinkedHashMap <> ();
     m_aForeignAttrs.put (sAttrName, sAttrValue);
   }
 
   public boolean hasForeignAttributes ()
   {
     return m_aForeignAttrs != null && m_aForeignAttrs.isNotEmpty ();
   }
 
   @Nonnull
   @ReturnsMutableCopy
   public ICommonsOrderedMap <String, String> getAllForeignAttributes ()
   {
     return new CommonsLinkedHashMap <> (m_aForeignAttrs);
   }
 
   public void setValue (@Nullable final EDirValue eValue)
   {
     m_eValue = eValue;
   }
 
   @Nullable
   public EDirValue getValue ()
   {
     return m_eValue;
   }
 
   public void addText (@Nonnull @Nonempty final String sText)
   {
     ValueEnforcer.notEmpty (sText, "Text");
     m_aContent.add (sText);
   }
 
   public boolean hasAnyText ()
   {
     return m_aContent.isNotEmpty ();
   }
 
   @Nonnull
   @ReturnsMutableCopy
   public ICommonsList <String> getAllTexts ()
   {
     return m_aContent.getClone ();
   }
 
   @Nullable
   public String getAsText ()
   {
     return StringHelper.getImploded (m_aContent);
   }
 
   @Nonnull
   public IMicroElement getAsMicroElement ()
   {
     final IMicroElement ret = new MicroElement (CSchematron.NAMESPACE_SCHEMATRON, CSchematronXML.ELEMENT_DIR);
     if (m_eValue != null)
       ret.setAttribute (CSchematronXML.ATTR_VALUE, m_eValue.getID ());
     if (m_aForeignElements != null)
       for (final IMicroElement aForeignElement : m_aForeignElements)
         ret.appendChild (aForeignElement.getClone ());
     for (final String sContent : m_aContent)
       ret.appendText (sContent);
     if (m_aForeignAttrs != null)
       for (final Map.Entry <String, String> aEntry : m_aForeignAttrs.entrySet ())
         ret.setAttribute (aEntry.getKey (), aEntry.getValue ());
     return ret;
   }
 
   @Nonnull
   public PSDir getClone ()
   {
     final PSDir ret = new PSDir ();
     ret.setValue (m_eValue);
     for (final String sContent : m_aContent)
       ret.addText (sContent);
     if (hasForeignElements ())
       ret.addForeignElements (m_aForeignElements);
     if (hasForeignAttributes ())
       ret.addForeignAttributes (m_aForeignAttrs);
     return ret;
   }
 
   @Override
   public String toString ()
   {
     return new ToStringGenerator (this).appendIfNotNull ("value", m_eValue)
                                        .appendIf ("content", m_aContent, CollectionHelper::isNotEmpty)
                                        .appendIf ("foreignAttrs", m_aForeignAttrs, CollectionHelper::isNotEmpty)
                                        .appendIf ("foreignElements", m_aForeignElements, CollectionHelper::isNotEmpty)
                                        .toString ();
   }
 }