/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.maven.plugin.testing;
  
  import java.io.File;
  
  import org.apache.maven.artifact.repository.MavenArtifactRepository;
  import org.apache.maven.artifact.repository.layout.DefaultRepositoryLayout;
  import org.codehaus.plexus.PlexusTestCase;
  import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;
  import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
  
  /**
   * Stub for {@link ExpressionEvaluator}
   *
   * @author jesse
   */
  public class ResolverExpressionEvaluatorStub implements ExpressionEvaluator {
      /** {@inheritDoc} */
      @Override
      public Object evaluate(String expr) throws ExpressionEvaluationException {
  
          Object value = null;
  
          if (expr == null) {
              return null;
          }
  
          String expression = stripTokens(expr);
  
          if (expression.equals(expr)) {
              int index = expr.indexOf("${");
              if (index >= 0) {
                  int lastIndex = expr.indexOf("}", index);
                  if (lastIndex >= 0) {
                      String retVal = expr.substring(0, index);
  
                      if (index > 0 && expr.charAt(index - 1) == '$') {
                          retVal += expr.substring(index + 1, lastIndex + 1);
                      } else {
                          retVal += evaluate(expr.substring(index, lastIndex + 1));
                      }
  
                      retVal += evaluate(expr.substring(lastIndex + 1));
                      return retVal;
                  }
              }
  
              // Was not an expression
              if (expression.indexOf("$$") > -1) {
                  return expression.replaceAll("\\$\\$", "\\$");
              }
          }
  
          if ("basedir".equals(expression) || "project.basedir".equals(expression)) {
              return PlexusTestCase.getBasedir();
          } else if (expression.startsWith("basedir") || expression.startsWith("project.basedir")) {
              int pathSeparator = expression.indexOf("/");
  
              if (pathSeparator > 0) {
                  value = PlexusTestCase.getBasedir() + expression.substring(pathSeparator);
              } else {
                  System.out.println("Got expression '" + expression + "' that was not recognised");
              }
              return value;
          } else if ("localRepository".equals(expression)) {
              File localRepo = new File(PlexusTestCase.getBasedir(), "target/local-repo");
              return new MavenArtifactRepository(
                      "localRepository",
                      "file://" + localRepo.getAbsolutePath(),
                      new DefaultRepositoryLayout(),
                      null,
                      null);
          } else {
              return expr;
          }
      }
  
      private String stripTokens(String expr) {
          if (expr.startsWith("${") && expr.indexOf("}") == expr.length() - 1) {
              expr = expr.substring(2, expr.length() - 1);
          }
  
         return expr;
     }
 
     /** {@inheritDoc} */
     @Override
     public File alignToBaseDirectory(File file) {
         if (file.getAbsolutePath().startsWith(PlexusTestCase.getBasedir())) {
             return file;
         } else if (file.isAbsolute()) {
             return file;
         } else {
             return new File(PlexusTestCase.getBasedir(), file.getPath());
         }
     }
 }