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/*
 * Sonar Java
 * Copyright (C) 2012 SonarSource
 * [email protected]
 *
 * This program 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 3 of the License, or (at your option) any later version.
 *
 * This program 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 program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 */
package org.sonar.java.ast;

import com.google.common.collect.Lists;
import com.sonar.sslr.api.AstNode;
import com.sonar.sslr.api.AuditListener;
import com.sonar.sslr.api.CommentAnalyser;
import com.sonar.sslr.api.Grammar;
import com.sonar.sslr.api.RecognitionException;
import com.sonar.sslr.impl.Parser;
import com.sonar.sslr.impl.ast.AstWalker;
import com.sonar.sslr.impl.events.ExtendedStackTrace;
import com.sonar.sslr.squid.SquidAstVisitor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.sonar.api.resources.InputFile;
import org.sonar.java.ast.api.JavaMetric;
import org.sonar.java.ast.visitors.VisitorContext;
import org.sonar.squid.api.AnalysisException;
import org.sonar.squid.api.CodeVisitor;
import org.sonar.squid.api.SourceCodeSearchEngine;
import org.sonar.squid.api.SourceCodeTreeDecorator;
import org.sonar.squid.api.SourceProject;
import org.sonar.squid.indexer.SquidIndex;
import org.sonar.sslr.parser.LexerlessGrammar;

import java.io.File;
import java.util.Collection;
import java.util.List;

/**
 * Replacement for {@link com.sonar.sslr.squid.AstScanner}.
 */
public class AstScanner {

  private static final Logger LOG = LoggerFactory.getLogger(AstScanner.class);

  private final SquidIndex index = new SquidIndex();
  private final List> visitors = Lists.newArrayList();
  private final List auditListeners = Lists.newArrayList();
  private final Parser parser;
  private final Parser parserDebug;
  private CommentAnalyser commentAnalyser;

  public AstScanner(Parser parser) {
    this.parser = parser;
    this.parserDebug = Parser.builder(parser)
        .setParsingEventListeners()
        .setExtendedStackTrace(new ExtendedStackTrace())
        .setRecognictionExceptionListener(this.auditListeners.toArray(new AuditListener[this.auditListeners.size()]))
        .build();
  }

  public void scan(Collection files) {
    SourceProject project = new SourceProject("Java Project");
    index.index(project);
    project.setSourceCodeIndexer(index);
    VisitorContext context = new VisitorContext(project);
    context.setCommentAnalyser(commentAnalyser);

    for (SquidAstVisitor visitor : visitors) {
      visitor.setContext(context);
      visitor.init();
    }

    AstWalker astWalker = new AstWalker(visitors);

    for (InputFile inputFile : files) {
      File file = inputFile.getFile();
      context.setFile(file);
      context.setInputFile(inputFile);

      try {
        AstNode ast = parser.parse(file);
        astWalker.walkAndVisit(ast);
      } catch (RecognitionException e) {
        LOG.error("Unable to parse source file : " + file.getAbsolutePath());

        try {
          if (e.isToRetryWithExtendStackTrace()) {
            try {
              parserDebug.parse(file);
            } catch (RecognitionException re) {
              e = re;
            } catch (Exception e2) {
              LOG.error("Unable to get an extended stack trace on file : " + file.getAbsolutePath(), e2);
            }

            // Log the recognition exception
            LOG.error(e.getMessage());
          } else {
            LOG.error(e.getMessage(), e);
          }

          // Process the exception
          for (SquidAstVisitor visitor : visitors) {
            visitor.visitFile(null);
          }

          for (AuditListener auditListener : auditListeners) {
            auditListener.processRecognitionException(e);
          }

          for (SquidAstVisitor visitor : Lists.reverse(visitors)) {
            visitor.leaveFile(null);
          }

        } catch (Exception e2) {
          String errorMessage = "Sonar is unable to analyze file : '" + file.getAbsolutePath() + "'";
          throw new AnalysisException(errorMessage, e);
        }
      } catch (Exception e) {
        String errorMessage = "Sonar is unable to analyze file : '" + file.getAbsolutePath() + "'";
        throw new AnalysisException(errorMessage, e);
      }
    }

    for (SquidAstVisitor visitor : visitors) {
      visitor.destroy();
    }

    SourceCodeTreeDecorator decorator = new SourceCodeTreeDecorator(project);
    decorator.decorateWith(JavaMetric.values());
    decorator.decorateWith(org.sonar.squid.measures.Metric.values());
  }

  public void withSquidAstVisitor(SquidAstVisitor visitor) {
    if (visitor instanceof AuditListener) {
      auditListeners.add((AuditListener) visitor);
    }
    this.visitors.add(visitor);
  }

  public SourceCodeSearchEngine getIndex() {
    return index;
  }

  public void setCommentAnalyser(CommentAnalyser commentAnalyser) {
    this.commentAnalyser = commentAnalyser;
  }

  public void accept(CodeVisitor visitor) {
    if (visitor instanceof SquidAstVisitor) {
      withSquidAstVisitor((SquidAstVisitor) visitor);
    }
  }

}