package org.jboss.resteasy.api.validation;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArrayList;

import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import javax.ws.rs.core.MediaType;

import org.jboss.resteasy.api.validation.ConstraintType.Type;
import org.jboss.resteasy.resteasy_jaxrs.i18n.Messages;
import org.jboss.resteasy.spi.ResteasyConfiguration;
import org.jboss.resteasy.spi.validation.ConstraintTypeUtil;

/**
 * @author <a href="ron.sigal@jboss.com">Ron Sigal</a>
 * @version $Revision: 1.1 $
 *
 * Copyright Mar 6, 2012
 *
 * {@literal @}TODO Need to work on representation of exceptions
 * {@literal @}TODO Add javadoc.
 */
public abstract class ResteasyViolationException extends ConstraintViolationException
{
   private static final long serialVersionUID = 2623733139912277260L;

   public static final String SUPPRESS_VIOLATION_PATH = "resteasy.validation.suppress.path";

   private volatile List<CloneableMediaType> accept;

   private volatile Exception exception;

   private final List<ResteasyConstraintViolation> propertyViolations = new CopyOnWriteArrayList<>();

   private final List<ResteasyConstraintViolation> classViolations = new CopyOnWriteArrayList<>();

   private final List<ResteasyConstraintViolation> parameterViolations = new CopyOnWriteArrayList<>();

   private final List<ResteasyConstraintViolation> returnValueViolations = new CopyOnWriteArrayList<>();

   private final List<ResteasyConstraintViolation> allViolations = new CopyOnWriteArrayList<>();

   private final List<List<ResteasyConstraintViolation>> violationLists = new CopyOnWriteArrayList<>();

   private transient ConstraintTypeUtil util = getConstraintTypeUtil();

   private boolean suppressPath;

   /**
    * New constructor
    * @param constraintViolations set of constraint violations
    */
   public ResteasyViolationException(final Set<? extends ConstraintViolation<?>> constraintViolations)
   {
      super(constraintViolations);
      checkSuppressPath();
      accept = new ArrayList<CloneableMediaType>();
      accept.add(CloneableMediaType.TEXT_PLAIN_TYPE);
      convertViolations();
   }

   /**
    * New constructor
    *
    * @param constraintViolations set of constraint violations
    * @param accept list of accept media types
    */
   public ResteasyViolationException(final Set<? extends ConstraintViolation<?>> constraintViolations, final List<MediaType> accept)
   {
      super(constraintViolations);
      checkSuppressPath();
      this.accept = toCloneableMediaTypeList(accept);
      convertViolations();
   }

   /**
    * New constructor
    *
    * @param container violation container
    */
   public ResteasyViolationException(final SimpleViolationsContainer container)
   {
      this(container.getViolations());
      setException(container.getException());
   }

   /**
    * New constructor
    *
    * @param container violation container
    * @param accept list of accept media types
    */

   public ResteasyViolationException(final SimpleViolationsContainer container, final List<MediaType> accept)
   {
      this(container.getViolations(), accept);
      setException(container.getException());
   }

   public ResteasyViolationException(final String stringRep)
   {
      super(null);
      checkSuppressPath();
      convertFromString(stringRep);
   }

   public abstract ConstraintTypeUtil getConstraintTypeUtil();

   public List<MediaType> getAccept()
   {
      return toMediaTypeList(accept);
   }

   public void setAccept(List<MediaType> accept)
   {
      this.accept = toCloneableMediaTypeList(accept);
   }

   public Exception getException()
   {
      return exception;
   }

   public void setException(Exception exception)
   {
      this.exception = exception;
      initCause(exception);
   }

   public List<ResteasyConstraintViolation> getViolations()
   {
      return allViolations;
   }

   public List<ResteasyConstraintViolation> getPropertyViolations()
   {
      return propertyViolations;
   }

   public List<ResteasyConstraintViolation> getClassViolations()
   {
      return classViolations;
   }

   public List<ResteasyConstraintViolation> getParameterViolations()
   {
      return parameterViolations;
   }

   public List<ResteasyConstraintViolation> getReturnValueViolations()
   {
      return returnValueViolations;
   }

   public int size()
   {
      return getViolations().size();
   }

   public List<List<ResteasyConstraintViolation>> getViolationLists()
   {
      return violationLists;
   }

   public String toString()
   {
      StringBuffer sb = new StringBuffer();
      for (List<ResteasyConstraintViolation> violations : violationLists) {
         for (ResteasyConstraintViolation violation: violations ) {
            sb.append(violation.toString()).append('\r');
         }
      }

      return sb.toString();
   }

   protected void convertFromString(String stringRep)
   {
      InputStream is = new ByteArrayInputStream(stringRep.getBytes());
      BufferedReader br = new BufferedReader(new InputStreamReader(is));
      String line;
      try
      {
         line = br.readLine();
         while (line != null)
         {
            ConstraintType.Type type = ConstraintType.Type.valueOf(line.substring(1, line.length() - 1));
            line = br.readLine();
            String path = line.substring(1, line.length() - 1);
            line = br.readLine();
            String message = line.substring(1, line.length() - 1);
            line = br.readLine();
            String value = line.substring(1, line.length() - 1);
            ResteasyConstraintViolation rcv = new ResteasyConstraintViolation(type, path, message, value);

            switch (type)
            {
               case PROPERTY :
                  propertyViolations.add(rcv);
                  break;

               case CLASS :
                  classViolations.add(rcv);
                  break;

               case PARAMETER :
                  parameterViolations.add(rcv);
                  break;

               case RETURN_VALUE :
                  returnValueViolations.add(rcv);
                  break;

               default :
                  throw new RuntimeException(Messages.MESSAGES.unexpectedViolationType(type));
            }
            allViolations.add(rcv);
            line = br.readLine(); // consume ending '\r'
            line = br.readLine();
         }
      }
      catch (IOException e)
      {
         throw new RuntimeException(Messages.MESSAGES.unableToParseException());
      }

      violationLists.clear();
      violationLists.add(propertyViolations);
      violationLists.add(classViolations);
      violationLists.add(parameterViolations);
      violationLists.add(returnValueViolations);
   }

   protected int getField(int start, String line)
   {
      int beginning = line.indexOf('[', start);
      if (beginning == -1)
      {
         throw new RuntimeException(Messages.MESSAGES.exceptionHasInvalidFormat(line));
      }
      int index = beginning;
      int bracketCount = 1;
      while (++index < line.length())
      {
         char c = line.charAt(index);
         if (c == '[')
         {
            bracketCount++;
         }
         else if (c == ']')
         {
            bracketCount--;
         }
         if (bracketCount == 0)
         {
            break;
         }
      }
      if (bracketCount != 0)
      {
         throw new RuntimeException(Messages.MESSAGES.exceptionHasInvalidFormat(line));
      }
      return index;
   }

   protected abstract ResteasyConfiguration getResteasyConfiguration();

   protected void checkSuppressPath()
   {
      ResteasyConfiguration context = getResteasyConfiguration();
      if (context != null)
      {
         String s = context.getParameter(SUPPRESS_VIOLATION_PATH);
         if (s != null)
         {
            suppressPath = Boolean.parseBoolean(s);
         }
      }
   }

   protected void convertViolations()
   {
      if (!violationLists.isEmpty())
      {
         return;
      }

      if (getConstraintViolations() != null)
      {
         for (Iterator<ConstraintViolation<?>> it = getConstraintViolations().iterator(); it.hasNext();)
         {
            ResteasyConstraintViolation rcv = convertViolation(it.next());
            switch (rcv.getConstraintType())
            {
               case PROPERTY :
                  propertyViolations.add(rcv);
                  break;

               case CLASS :
                  classViolations.add(rcv);
                  break;

               case PARAMETER :
                  parameterViolations.add(rcv);
                  break;

               case RETURN_VALUE :
                  returnValueViolations.add(rcv);
                  break;

               default :
                  throw new RuntimeException(Messages.MESSAGES.unexpectedViolationType(rcv.getConstraintType()));
            }
            allViolations.add(rcv);
         }
      }

      violationLists.add(propertyViolations);
      violationLists.add(classViolations);
      violationLists.add(parameterViolations);
      violationLists.add(returnValueViolations);
   }

   protected ResteasyConstraintViolation convertViolation(ConstraintViolation<?> violation)
   {
      Type ct = util.getConstraintType(violation);
      String path = (suppressPath ? "*" : violation.getPropertyPath().toString());
      return new ResteasyConstraintViolation(ct, path, violation.getMessage(),
            convertArrayToString(violation.getInvalidValue()));
   }

   protected static String convertArrayToString(Object o)
   {
      String result = null;
      if (o instanceof Object[])
      {
         Object[] array = Object[].class.cast(o);
         if (array.length == 0)
         {
            return "[]";
         }
         StringBuffer sb = new StringBuffer("[").append(convertArrayToString(array[0]));
         for (int i = 1; i < array.length; i++)
         {
            sb.append(", ").append(convertArrayToString(array[i]));
         }
         sb.append("]");
         result = sb.toString();
      }
      else
      {
         result = (o == null ? "" : o.toString());
      }
      return result;
   }

   /**
    * It seems that EJB3 wants to clone ResteasyViolationException,
    * and MediaType is not serializable.
    *
    */
   static class CloneableMediaType implements Serializable
   {
      public static final CloneableMediaType TEXT_PLAIN_TYPE = new CloneableMediaType("plain", "text");

      private static final long serialVersionUID = 9179565449557464429L;

      private String type;

      private String subtype;

      private Map<String, String> parameters;

      CloneableMediaType(final MediaType mediaType)
      {
         type = mediaType.getType();
         subtype = mediaType.getSubtype();
         parameters = new HashMap<String, String>(mediaType.getParameters());
      }

      CloneableMediaType(final String type, final String subtype)
      {
         this.type = type;
         this.subtype = subtype;
      }

      public MediaType toMediaType()
      {
         return new MediaType(type, subtype, parameters);
      }
   }

   protected static List<CloneableMediaType> toCloneableMediaTypeList(List<MediaType> list)
   {
      List<CloneableMediaType> cloneableList = new ArrayList<CloneableMediaType>();
      for (Iterator<MediaType> it = list.iterator(); it.hasNext();)
      {
         cloneableList.add(new CloneableMediaType(it.next()));
      }
      return cloneableList;
   }

   protected static List<MediaType> toMediaTypeList(List<CloneableMediaType> cloneableList)
   {
      List<MediaType> list = new ArrayList<MediaType>();
      for (Iterator<CloneableMediaType> it = cloneableList.iterator(); it.hasNext();)
      {
         CloneableMediaType cmt = it.next();
         list.add(new MediaType(cmt.type, cmt.subtype, cmt.parameters));
      }
      return list;
   }
}
