/**
    * Copyright (C) 2014-2015 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.ArrayList;
  import java.util.LinkedHashMap;
  import java.util.List;
  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.microdom.IMicroElement;
  import com.helger.commons.microdom.MicroElement;
  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;
  
  /**
   * A single Schematron span-element.<br>
   * A portion of some paragraph that should be rendered in a distinct way, keyed
   * with the class attribute.<br>
   * An implementation is not required to make use of this element.
   *
   * @author Philip Helger
   */
  @NotThreadSafe
  public class PSSpan implements IPSClonableElement <PSSpan>, IPSOptionalElement, IPSHasForeignElements, IPSHasTexts
  {
    private String m_sClass;
    private final List <String> m_aContent = new ArrayList <String> ();
    private Map <String, String> m_aForeignAttrs;
    private List <IMicroElement> m_aForeignElements;
  
    public PSSpan ()
    {}
  
    public boolean isValid (@Nonnull final IPSErrorHandler aErrorHandler)
    {
      if (StringHelper.hasNoText (m_sClass))
      {
        aErrorHandler.error (this, "<span> has no 'class'");
        return false;
      }
      if (m_aContent.isEmpty ())
      {
        aErrorHandler.error (this, "<span> has no content");
        return false;
      }
      return true;
    }
  
    public void validateCompletely (@Nonnull final IPSErrorHandler aErrorHandler)
    {
      if (StringHelper.hasNoText (m_sClass))
        aErrorHandler.error (this, "<span> has no 'class'");
      if (m_aContent.isEmpty ())
        aErrorHandler.error (this, "<span> 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 ArrayList <IMicroElement> ();
      m_aForeignElements.add (aForeignElement);
    }
  
    public void addForeignElements (@Nonnull final List <IMicroElement> aForeignElements)
    {
      ValueEnforcer.notNull (aForeignElements, "ForeignElements");
     for (final IMicroElement aForeignElement : aForeignElements)
       addForeignElement (aForeignElement);
   }
 
   public boolean hasForeignElements ()
   {
     return m_aForeignElements != null && !m_aForeignElements.isEmpty ();
   }
 
   @Nonnull
   @ReturnsMutableCopy
   public List <IMicroElement> getAllForeignElements ()
   {
     return CollectionHelper.newList (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 LinkedHashMap <String, String> ();
     m_aForeignAttrs.put (sAttrName, sAttrValue);
   }
 
   public void addForeignAttributes (@Nonnull final Map <String, String> aForeignAttrs)
   {
     ValueEnforcer.notNull (aForeignAttrs, "ForeignAttrs");
     for (final Map.Entry <String, String> aEntry : aForeignAttrs.entrySet ())
       addForeignAttribute (aEntry.getKey (), aEntry.getValue ());
   }
 
   public boolean hasForeignAttributes ()
   {
     return m_aForeignAttrs != null && !m_aForeignAttrs.isEmpty ();
   }
 
   @Nonnull
   @ReturnsMutableCopy
   public Map <String, String> getAllForeignAttributes ()
   {
     return CollectionHelper.newOrderedMap (m_aForeignAttrs);
   }
 
   public void setClazz (@Nullable final String sClass)
   {
     m_sClass = sClass;
   }
 
   @Nullable
   public String getClazz ()
   {
     return m_sClass;
   }
 
   public void addText (@Nonnull @Nonempty final String sText)
   {
     ValueEnforcer.notEmpty (sText, "Text");
     m_aContent.add (sText);
   }
 
   public boolean hasAnyText ()
   {
     return !m_aContent.isEmpty ();
   }
 
   @Nonnull
   @ReturnsMutableCopy
   public List <String> getAllTexts ()
   {
     return CollectionHelper.newList (m_aContent);
   }
 
   @Nullable
   public String getAsText ()
   {
     return StringHelper.getImploded (m_aContent);
   }
 
   @Nonnull
   public IMicroElement getAsMicroElement ()
   {
     final IMicroElement ret = new MicroElement (CSchematron.NAMESPACE_SCHEMATRON, CSchematronXML.ELEMENT_SPAN);
     ret.setAttribute (CSchematronXML.ATTR_CLASS, m_sClass);
     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 PSSpan getClone ()
   {
     final PSSpan ret = new PSSpan ();
     ret.setClazz (m_sClass);
     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 ("class", m_sClass)
                                        .appendIfNotEmpty ("content", m_aContent)
                                        .appendIfNotEmpty ("foreignAttrs", m_aForeignAttrs)
                                        .appendIfNotEmpty ("foreignElements", m_aForeignElements)
                                        .toString ();
   }
 }