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// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
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package org.apache.juneau.parser;

import static org.apache.juneau.internal.StringUtils.*;

import java.lang.reflect.*;
import java.text.*;
import java.util.*;

import org.apache.juneau.*;
import org.apache.juneau.internal.*;
import org.apache.juneau.serializer.*;

/**
 * Exception that indicates invalid syntax encountered during parsing.
 */
public class ParseException extends FormattedException {

   private static final long serialVersionUID = 1L;

   /**
    * Creator method.
    *
    * <p>
    * If the throwable is already a {@link ParseException}, we simply return that exception as-is.
    * If the throwable is an {@link InvocationTargetException}, we unwrap the thrown exception.
    * Otherwise we create a new {@link ParseException}.
    *
    * @param e The exception being wrapped or unwrapped.
    * @return A new {@link SerializeException}.
    */
   public static ParseException create(Throwable e) {
      if (e instanceof InvocationTargetException)
         e = ((InvocationTargetException)e).getCause();
      if (e instanceof ParseException)
         return (ParseException)e;
      return new ParseException(e);
   }

   /**
    * Constructor.
    *
    * @param message The {@link MessageFormat}-style message.
    * @param args Optional {@link MessageFormat}-style arguments.
    */
   public ParseException(String message, Object...args) {
      super(message, args);
   }

   /**
    * Constructor.
    *
    * @param causedBy The cause of this exception.
    * @param message The {@link MessageFormat}-style message.
    * @param args Optional {@link MessageFormat}-style arguments.
    */
   public ParseException(Throwable causedBy, String message, Object...args) {
      super(causedBy, message, args);
   }

   /**
    * Constructor.
    *
    * @param causedBy The cause of this exception.
    */
   public ParseException(Throwable causedBy) {
      super(causedBy);
   }

   /**
    * Constructor.
    *
    * @param session The parser session.
    * @param message The exception message containing {@link MessageFormat}-style arguments.
    * @param args Optional {@link MessageFormat}-style arguments.
    */
   public ParseException(ParserSession session, String message, Object...args) {
      super(getMessage(session, message, args));
   }

   /**
    * Constructor.
    *
    * @param session The parser session.
    * @param causedBy The cause of this exception.
    * @param message The exception message containing {@link MessageFormat}-style arguments.
    * @param args Optional {@link MessageFormat}-style arguments.
    */
   public ParseException(ParserSession session, Throwable causedBy, String message, Object...args) {
      super(causedBy, getMessage(session, message, args));
   }

   /**
    * Constructor.
    *
    * @param session The parser session.
    * @param causedBy The inner exception.
    */
   public ParseException(ParserSession session, Exception causedBy) {
      super(causedBy, getMessage(session, causedBy.getMessage()));
   }


   private static String getMessage(ParserSession session, String msg, Object... args) {
      if (args.length != 0)
         msg = format(msg, args);

      if (session != null) {
         Position p = session.getPosition();

         msg += "\n\tAt: " + p;

         ObjectMap lastLocation = session.getLastLocation();
         if (lastLocation != null) {
            msg += "\n\tWhile parsing into: ";
            for (Map.Entry<String,Object> e : lastLocation.entrySet())
               msg += "\n\t\t" + e.getKey() + ": " + e.getValue();
         }

         String lines = session.getInputAsString();
         if (lines == null)
            msg += "\n\tUse BEAN_debug setting to display content.";
         else {
            int numLines = session.getDebugOutputLines();
            int start = p.line - numLines, end = p.line + numLines;
            msg += "\n---start--\n" + StringUtils.getNumberedLines(lines, start, end) + "---end---";
         }
      }
      return msg;
   }

   /**
    * Returns the highest-level <c>ParseException</c> in the stack trace.
    *
    * <p>
    * Useful for JUnit testing of error conditions.
    *
    * @return The root parse exception, or this exception if there isn't one.
    */
   public ParseException getRootCause() {
      ParseException t = this;
      while (! (t.getCause() == null || ! (t.getCause() instanceof ParseException)))
         t = (ParseException)t.getCause();
      return t;
   }
}