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com.hfg xml, html, svg, and bioinformatics utility library
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package com.hfg.css;


import java.io.IOException;
import java.io.StringReader;
import java.util.*;

import com.hfg.util.collection.CollectionUtil;
import com.hfg.util.StringBuilderPlus;
import com.hfg.util.StringUtil;

//------------------------------------------------------------------------------
/**
 CSS Rule encapsulation.

 @author J. Alex Taylor, hairyfatguy.com
 */
//------------------------------------------------------------------------------
// com.hfg XML/HTML Coding Library
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// J. Alex Taylor, President, Founder, CEO, COO, CFO, OOPS hairyfatguy.com
// [email protected]
//------------------------------------------------------------------------------

public class CSSRule
{
   private Set   mMediaQueries;
   private List    mSelectors;
   private List mDeclarations;

   //##########################################################################
   // CONSTRUCTORS
   //##########################################################################

   //--------------------------------------------------------------------------
   public CSSRule()
   {
   }

   //--------------------------------------------------------------------------
   public CSSRule(String inRuleString)
   {
      List cssRules;
      try
      {
         cssRules = new CSS(new StringReader(inRuleString)).getCSSRules();
      }
      catch (IOException e)
      {
         throw new RuntimeException(e);
      }

      if (cssRules.size() != 1)
      {
         throw new RuntimeException("Only a single CSS rule can be passed to the CSSRule constructor!");
      }

      mSelectors    = cssRules.get(0).getSelectors();
      mDeclarations = cssRules.get(0).getDeclarations();
   }

   //--------------------------------------------------------------------------
   public CSSRule(List inSelectors, List inDeclarations)
   {
      mSelectors    = inSelectors;
      mDeclarations = inDeclarations;
   }

   //##########################################################################
   // PUBLIC METHODS
   //##########################################################################

   //--------------------------------------------------------------------------
   @Override
   public String toString()
   {
      StringBuilderPlus buffer = new StringBuilderPlus();

      String indent = "";
      if (CollectionUtil.hasValues(mMediaQueries))
      {
         buffer.append("@media ");
         buffer.append(StringUtil.join(mMediaQueries, ", "));
         buffer.appendln(" {");
         indent = " ";
      }

      if (CollectionUtil.hasValues(mSelectors))
      {
         buffer.append(indent + StringUtil.join(mSelectors, ", "));
         buffer.appendln(" {");
         buffer.append(indent + "  ");
         if (CollectionUtil.hasValues(mDeclarations))
         {
            buffer.append(StringUtil.join(mDeclarations, ";\n  " + indent));
            buffer.appendln(";");
         }
         buffer.appendln(indent + "}");
      }

      if (CollectionUtil.hasValues(mMediaQueries))
      {
         buffer.appendln("}");
      }

      return buffer.toString();
   }

   //--------------------------------------------------------------------------
   public String getDeclarationString()
   {
      String declarationString = "";

      if (CollectionUtil.hasValues(mDeclarations))
      {
         declarationString = StringUtil.join(mDeclarations, "; ");
      }

      return declarationString;
   }

   //--------------------------------------------------------------------------
   public CSSRule setMediaType(CSSMediaType inValue)
   {
      if (mMediaQueries != null)
      {
         mMediaQueries.clear();
      }

      addMediaQuery(new CSSMediaQuery().setMediaType(inValue));

      return this;
   }

   //--------------------------------------------------------------------------
   public CSSRule setMediaQueries(Collection inValue)
   {
      if (! CollectionUtil.hasValues(inValue))
      {
         mMediaQueries = null;
      }
      else
      {
         for (CSSMediaQuery mediaQuery : inValue)
         {
            addMediaQuery(mediaQuery);
         }
      }

      return this;
   }

   //--------------------------------------------------------------------------
   public CSSRule addMediaQuery(CSSMediaQuery inValue)
   {
      if (null == mMediaQueries)
      {
         mMediaQueries = new HashSet<>(2);
      }

      mMediaQueries.add(inValue);

      return this;
   }

   //--------------------------------------------------------------------------
   // Kind of simplistic at the moment.
   public boolean appliesTo(CSSMediaType inValue)
   {
      boolean applies = true;
      if (inValue != null
          && mMediaQueries != null)
      {
         applies = false;
         for (CSSMediaQuery mediaQuery : mMediaQueries)
         {
            if (null == mediaQuery.getMediaType()
                || mediaQuery.getMediaType().equals(inValue))
            {
               applies = true;
               break;
            }
         }
      }

      return applies;
   }

   //--------------------------------------------------------------------------
   public Set getMediaQueries()
   {
      return mMediaQueries;
   }

   //--------------------------------------------------------------------------
   public CSSRule addSelector(String inValue)
   {
      return addSelector(new CSSSelector(inValue));
   }

   //--------------------------------------------------------------------------
   public CSSRule addSelector(CSSSelector inValue)
   {
      if (null == mSelectors)
      {
         mSelectors = new ArrayList<>(5);
      }

      mSelectors.add(inValue);

      return this;
   }

   //--------------------------------------------------------------------------
   public List getSelectors()
   {
      return mSelectors;
   }

   //--------------------------------------------------------------------------
   public CSSRule addDeclaration(CSSProperty inProperty, String inValue)
   {
      return addDeclaration(new CSSDeclaration(inProperty, inValue));
   }

   //--------------------------------------------------------------------------
   public CSSRule addDeclaration(CSSProperty inProperty, int inValue)
   {
      return addDeclaration(new CSSDeclaration(inProperty, inValue));
   }

   //--------------------------------------------------------------------------
   public CSSRule addDeclaration(CSSDeclaration inValue)
   {
      if (null == mDeclarations)
      {
         mDeclarations = new ArrayList<>(10);
      }

      mDeclarations.add(inValue);

      return this;
   }

   //--------------------------------------------------------------------------
   public List getDeclarations()
   {
      return mDeclarations;
   }
}