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/*
 * SonarQube 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;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;
import org.apache.commons.lang.StringUtils;
import org.sonar.java.model.InternalSyntaxToken;
import org.sonar.java.model.JavaTree;
import org.sonar.java.signature.MethodSignaturePrinter;
import org.sonar.java.signature.MethodSignatureScanner;
import org.sonar.plugins.java.api.JavaFileScanner;
import org.sonar.plugins.java.api.JavaFileScannerContext;
import org.sonar.plugins.java.api.tree.AnnotationTree;
import org.sonar.plugins.java.api.tree.BaseTreeVisitor;
import org.sonar.plugins.java.api.tree.ClassTree;
import org.sonar.plugins.java.api.tree.ExpressionTree;
import org.sonar.plugins.java.api.tree.IdentifierTree;
import org.sonar.plugins.java.api.tree.LiteralTree;
import org.sonar.plugins.java.api.tree.MemberSelectExpressionTree;
import org.sonar.plugins.java.api.tree.MethodTree;
import org.sonar.plugins.java.api.tree.NewArrayTree;
import org.sonar.plugins.java.api.tree.Tree;

import java.io.File;
import java.util.Deque;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

public class JavaFilesCache extends BaseTreeVisitor implements JavaFileScanner {

  @VisibleForTesting
  Map resourcesCache = Maps.newHashMap();

  @VisibleForTesting
  Map methodStartLines = Maps.newHashMap();

  @VisibleForTesting
  Multimap suppressWarningLines = HashMultimap.create();

  private File currentFile;
  private Deque currentClassKey = new LinkedList();
  private Deque parent = new LinkedList();
  private Deque anonymousInnerClassCounter = new LinkedList();
  private String currentPackage;

  public Map getResourcesCache() {
    return resourcesCache;
  }

  public Map getMethodStartLines() {
    return methodStartLines;
  }

  public Multimap getSuppressWarningLines() {
    return suppressWarningLines;
  }

  public boolean hasSuppressWarningLines() {
    return !suppressWarningLines.isEmpty();
  }

  @Override
  public void scanFile(JavaFileScannerContext context) {
    JavaTree.CompilationUnitTreeImpl tree = (JavaTree.CompilationUnitTreeImpl) context.getTree();
    currentPackage = tree.packageNameAsString().replace('.', '/');
    currentFile = context.getFile();
    currentClassKey.clear();
    parent.clear();
    anonymousInnerClassCounter.clear();
    suppressWarningLines.clear();
    scan(tree);
  }

  @Override
  public void visitClass(ClassTree tree) {
    String className = "";
    if (tree.simpleName() != null) {
      className = tree.simpleName().name();
    }
    String key = getClassKey(className);
    currentClassKey.push(key);
    parent.push(tree);
    anonymousInnerClassCounter.push(0);
    resourcesCache.put(key, currentFile);
    handleSuppressWarning(tree);
    super.visitClass(tree);
    currentClassKey.pop();
    parent.pop();
    anonymousInnerClassCounter.pop();
  }

  private String getClassKey(String className) {
    String key = className;
    if (StringUtils.isNotEmpty(currentPackage)) {
      key = currentPackage + "/" + className;
    }
    if ("".equals(className) || (parent.peek() != null && parent.peek().is(Tree.Kind.METHOD))) {
      // inner class declared within method
      int count = anonymousInnerClassCounter.pop() + 1;
      key = currentClassKey.peek() + "$" + count + className;
      anonymousInnerClassCounter.push(count);
    } else if (currentClassKey.peek() != null) {
      key = currentClassKey.peek() + "$" + className;
    }
    return key;
  }

  @Override
  public void visitMethod(MethodTree tree) {
    parent.push(tree);
    String methodKey = currentClassKey.peek() + "#" + MethodSignaturePrinter.print(MethodSignatureScanner.scan(tree));
    methodStartLines.put(methodKey, ((JavaTree) tree.simpleName()).getLine());
    handleSuppressWarning(tree);
    super.visitMethod(tree);
    parent.pop();
  }

  private void handleSuppressWarning(ClassTree tree) {
    int endLine = ((InternalSyntaxToken) tree.closeBraceToken()).getLine();
    handleSuppressWarning(tree.modifiers().annotations(), endLine);
  }

  private void handleSuppressWarning(MethodTree tree) {
    int endLine = ((JavaTree) tree.simpleName()).getLine();
    // if we have no block, then we assume method is on one line on the method name line.
    if (tree.block() != null) {
      endLine = ((InternalSyntaxToken) tree.block().closeBraceToken()).getLine();
    }
    handleSuppressWarning(tree.modifiers().annotations(), endLine);
  }

  private void handleSuppressWarning(List annotationTrees, int endLine) {
    int startLine = 0;
    List warnings = Lists.newArrayList();
    for (AnnotationTree annotationTree : annotationTrees) {
      if (isSuppressWarningsAnnotation(annotationTree)) {
        startLine = ((JavaTree) annotationTree).getLine();
        warnings.addAll(getSuppressWarningArgs(annotationTree));
        break;
      }
    }
    for (int i = startLine; i <= endLine; i++) {
      suppressWarningLines.putAll(i, warnings);
    }
  }

  private boolean isSuppressWarningsAnnotation(AnnotationTree annotationTree) {
    boolean suppressWarningsType = false;
    Tree type = annotationTree.annotationType();
    if (type.is(Tree.Kind.IDENTIFIER)) {
      suppressWarningsType = "SuppressWarnings".equals(((IdentifierTree) type).name());
    } else if (type.is(Tree.Kind.MEMBER_SELECT)) {
      MemberSelectExpressionTree mset = (MemberSelectExpressionTree) type;
      suppressWarningsType = "SuppressWarnings".equals(mset.identifier().name()) &&
        mset.expression().is(Tree.Kind.MEMBER_SELECT) && "lang".equals(((MemberSelectExpressionTree) mset.expression()).identifier().name());
    }
    return suppressWarningsType;
  }

  private List getSuppressWarningArgs(AnnotationTree annotationTree) {
    return getValueFromExpression(annotationTree.arguments().get(0));
  }

  private List getValueFromExpression(ExpressionTree expression) {
    List args = Lists.newArrayList();
    if (expression.is(Tree.Kind.STRING_LITERAL)) {
      args.add(trimQuotes(((LiteralTree) expression).value()));
    } else if (expression.is(Tree.Kind.NEW_ARRAY)) {
      for (ExpressionTree initializer : ((NewArrayTree) expression).initializers()) {
        args.addAll(getValueFromExpression(initializer));
      }
    }
    return args;
  }

  private String trimQuotes(String value) {
    return value.substring(1, value.length() - 1);
  }
}