// Copyright 2012 Google Inc. All Rights Reserved.
//
// Licensed 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 com.google.gitiles;

import java.util.Collections;
import java.util.Enumeration;

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;

import org.eclipse.jgit.errors.RepositoryNotFoundException;
import org.eclipse.jgit.internal.storage.dfs.DfsRepository;
import org.eclipse.jgit.junit.TestRepository;
import org.eclipse.jgit.lib.Config;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.transport.resolver.RepositoryResolver;

import com.google.common.collect.ImmutableList;

/** Static utility methods for creating {@link GitilesServlet}s for testing. */
public class TestGitilesServlet {
  /** @see #create(TestRepository) */
  public static GitilesServlet create(final TestRepository<DfsRepository> repo)
      throws ServletException {
    return create(repo, new GitwebRedirectFilter());
  }

  /**
   * Create a servlet backed by a single test repository.
   * <p>
   * The servlet uses the same filter lists as a real servlet, but only knows
   * about a single repo, having the name returned by
   * {@link org.eclipse.jgit.internal.storage.dfs.DfsRepositoryDescription#getRepositoryName()}.
   * Pass a {@link FakeHttpServletRequest} and {@link FakeHttpServletResponse}
   * to the servlet's {@code service} method to test.
   *
   * @param repo the test repo backing the servlet.
   * @param gitwebRedirect optional redirect filter for gitweb URLs.
   * @return a servlet.
   */
  public static GitilesServlet create(final TestRepository<DfsRepository> repo,
      GitwebRedirectFilter gitwebRedirect) throws ServletException {
    final String repoName =
        repo.getRepository().getDescription().getRepositoryName();
    GitilesServlet servlet =
        new GitilesServlet(new Config(), new DebugRenderer(GitilesServlet.STATIC_PREFIX,
              ImmutableList.<String> of(), null, repoName + " test site"),
            TestGitilesUrls.URLS, new TestGitilesAccess(repo.getRepository()),
            new RepositoryResolver<HttpServletRequest>() {
              @Override
              public Repository open(HttpServletRequest req, String name)
                  throws RepositoryNotFoundException {
                if (!repoName.equals(name)) {
                  throw new RepositoryNotFoundException(name);
                }
                return repo.getRepository();
              }
            }, null, null, null, gitwebRedirect);

    servlet.init(new ServletConfig() {
      @Override
      public String getInitParameter(String name) {
        return null;
      }

      @Override
      public Enumeration<String> getInitParameterNames() {
        return Collections.enumeration(ImmutableList.<String> of());
      }

      @Override
      public ServletContext getServletContext() {
        return null;
      }

      @Override
      public String getServletName() {
        return TestGitilesServlet.class.getName();
      }
    });
    return servlet;
  }

  private TestGitilesServlet() {
  }
}