// Copyright (C) 2018 The Android Open Source Project
//
// 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.googlesource.gerrit.plugins.deleteproject;

import static com.google.common.truth.Truth.assertThat;
import static com.google.common.truth.Truth.assertWithMessage;
import static com.google.gerrit.acceptance.GitUtil.pushHead;
import static com.google.gerrit.acceptance.testsuite.project.TestProjectUpdate.allow;
import static com.google.gerrit.server.group.SystemGroupBackend.REGISTERED_USERS;
import static com.google.gerrit.server.project.ProjectCache.illegalState;
import static java.nio.file.StandardCopyOption.REPLACE_EXISTING;

import com.google.common.base.Joiner;
import com.google.gerrit.acceptance.LightweightPluginDaemonTest;
import com.google.gerrit.acceptance.RestResponse;
import com.google.gerrit.acceptance.TestPlugin;
import com.google.gerrit.acceptance.UseLocalDisk;
import com.google.gerrit.acceptance.UseSsh;
import com.google.gerrit.acceptance.config.GerritConfig;
import com.google.gerrit.acceptance.testsuite.project.ProjectOperations;
import com.google.gerrit.acceptance.testsuite.request.RequestScopeOperations;
import com.google.gerrit.entities.CachedProjectConfig;
import com.google.gerrit.entities.Permission;
import com.google.gerrit.entities.Project;
import com.google.gerrit.entities.RefNames;
import com.google.gerrit.extensions.client.ProjectState;
import com.google.gerrit.extensions.restapi.RestApiException;
import com.google.inject.Inject;
import com.googlesource.gerrit.plugins.deleteproject.DeleteProject.Input;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.stream.Stream;
import org.apache.commons.io.FileUtils;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.transport.PushResult;
import org.eclipse.jgit.transport.RemoteRefUpdate;
import org.eclipse.jgit.transport.RemoteRefUpdate.Status;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

@UseSsh
@TestPlugin(
    name = "delete-project",
    sysModule = "com.googlesource.gerrit.plugins.deleteproject.PluginModule",
    sshModule = "com.googlesource.gerrit.plugins.deleteproject.SshModule",
    httpModule = "com.googlesource.gerrit.plugins.deleteproject.HttpModule")
public class DeleteProjectIT extends LightweightPluginDaemonTest {

  private static final String PLUGIN = "delete-project";
  private static final String ARCHIVE_FOLDER = "archiveFolder";
  private static final String PARENT_FOLDER = "parentFolder";

  @Inject private ProjectOperations projectOperations;
  @Inject private RequestScopeOperations requestScopeOperations;

  private File archiveFolder;
  private File projectDir;

  @Before
  public void setUpArchiveFolder() throws IOException {
    archiveFolder = Files.createDirectories(Paths.get(ARCHIVE_FOLDER)).toFile();
    projectDir = verifyProjectRepoExists(project);
  }

  @After
  public void removeArchiveFolder() {
    FileUtils.deleteQuietly(archiveFolder);
  }

  @Test
  @UseLocalDisk
  public void testHttpDeleteProjectForce() throws Exception {
    RestResponse r = httpDeleteProjectHelper(true);
    r.assertNoContent();
    assertThat(projectDir.exists()).isFalse();
    assertAllChangesDeletedInIndex();
  }

  @Test
  @UseLocalDisk
  public void testHttpDeleteProjectNotForce() throws Exception {
    createChange();
    RestResponse r = httpDeleteProjectHelper(false);
    r.assertConflict();
    assertThat(projectDir.exists()).isTrue();
  }

  @Test
  @UseLocalDisk
  public void testHttpDeleteProjectWithWatches() throws Exception {
    watch(project.get());
    RestResponse r = httpDeleteProjectHelper(true);
    r.assertNoContent();
    assertThat(projectDir.exists()).isFalse();
    assertAllChangesDeletedInIndex();
    assertWatchRemoved();
  }

  @Test
  @UseLocalDisk
  public void testSshDeleteProjectWithoutOptions() throws Exception {
    createChange();
    String cmd = Joiner.on(" ").join(PLUGIN, "delete", project.get());
    String expected =
        String.format(
            "Really delete '%s'?\n"
                + "This is an operation which permanently deletes data. This cannot be undone!\n"
                + "If you are sure you wish to delete this project, re-run with the --yes-really-delete flag.\n\n",
            project.get());
    adminSshSession.exec(cmd);

    assertThat(projectDir.exists()).isTrue();
    assertThat(adminSshSession.getError()).isEqualTo(expected);
  }

  @Test
  @UseLocalDisk
  public void testSshDeleteProjYesReallyDelete() throws Exception {
    createChange();
    String cmd = createDeleteCommand(project.get());
    String expected =
        String.format(
            "Project '%s' has open changes. - To really delete '%s', re-run with the --force flag.%n",
            project.get(), project.get());
    adminSshSession.exec(cmd);

    assertThat(projectDir.exists()).isTrue();
    assertThat(adminSshSession.getError()).isEqualTo(expected);
  }

  @Test
  @UseLocalDisk
  public void testSshDeleteProjYesReallyDeleteForce() throws Exception {
    createChange();
    String cmd = createDeleteCommand("--force", project.get());
    adminSshSession.exec(cmd);
    assertThat(adminSshSession.getError()).isNull();
    assertThat(projectDir.exists()).isFalse();
    assertAllChangesDeletedInIndex();
  }

  @Test
  @UseLocalDisk
  public void testSshDeleteProjectWithWatches() throws Exception {
    watch(project.get());
    String cmd = createDeleteCommand(project.get());
    adminSshSession.exec(cmd);
    assertThat(adminSshSession.getError()).isNull();
    assertThat(projectDir.exists()).isFalse();
    assertAllChangesDeletedInIndex();
    assertWatchRemoved();
  }

  @Test
  @UseLocalDisk
  @GerritConfig(name = "plugin.delete-project.hideProjectOnPreserve", value = "true")
  public void testSshHideProject() throws Exception {
    String cmd = createDeleteCommand("--preserve-git-repository", project.get());
    adminSshSession.exec(cmd);

    CachedProjectConfig cfg =
        projectCache.get(project).orElseThrow(illegalState(project)).getConfig();
    ProjectState state = cfg.getProject().getState();

    assertThat(state).isEqualTo(ProjectState.HIDDEN);
    assertThat(adminSshSession.getError()).isNull();
    assertThat(projectDir.exists()).isTrue();
  }

  @Test
  @UseLocalDisk
  public void testDeleteProjWithChildren() throws Exception {
    String childrenString = createProjectOverAPI("foo", project, true, null).get();
    verifyProjectRepoExists(Project.NameKey.parse(childrenString));

    String cmd = createDeleteCommand(project.get());
    adminSshSession.exec(cmd);
    assertThat(adminSshSession.getError())
        .isEqualTo(
            "fatal: Cannot delete project because it has at least one child: "
                + childrenString
                + "\n");
    assertThat(projectDir.exists()).isTrue();
  }

  @Test
  @UseLocalDisk
  public void testDeleteAllProject() throws Exception {
    String name = allProjects.get();
    String cmd = createDeleteCommand(name);
    adminSshSession.exec(cmd);

    assertThat(adminSshSession.getError())
        .isEqualTo("fatal: Cannot delete project because it is protected against deletion" + "\n");
  }

  @Test
  @UseLocalDisk
  @GerritConfig(name = "plugin.delete-project.allowDeletionOfReposWithTags", value = "false")
  public void testDeleteProjWithTags() throws Exception {
    projectOperations
        .project(project)
        .forUpdate()
        .add(allow(Permission.CREATE).ref("refs/tags/*").group(REGISTERED_USERS))
        .update();
    pushTagOldCommitNotForce();

    String cmd = createDeleteCommand(project.get());
    adminSshSession.exec(cmd);
    assertThat(adminSshSession.getError())
        .isEqualTo("fatal: Project " + project.get() + " has tags" + "\n");
    assertThat(projectDir.exists()).isTrue();
  }

  @Test
  @UseLocalDisk
  @GerritConfig(name = "plugin.delete-project.archiveDeletedRepos", value = "true")
  @GerritConfig(name = "plugin.delete-project.archiveFolder", value = ARCHIVE_FOLDER)
  public void testArchiveProject() throws Exception {
    assertThat(archiveFolder.exists()).isTrue();
    assertThat(isEmpty(archiveFolder.toPath())).isTrue();

    String cmd = createDeleteCommand(project.get());
    adminSshSession.exec(cmd);

    assertThat(adminSshSession.getError()).isNull();
    assertThat(isEmpty(archiveFolder.toPath())).isFalse();
    assertThat(containsDeletedProject(archiveFolder.toPath(), project.get())).isTrue();
    assertThat(projectDir.exists()).isFalse();
    assertAllChangesDeletedInIndex();
  }

  @Test
  @UseLocalDisk
  @GerritConfig(name = "plugin.delete-project.archiveDeletedRepos", value = "true")
  @GerritConfig(name = "plugin.delete-project.archiveFolder", value = ARCHIVE_FOLDER)
  public void testDeleteAndArchiveProjectWithParentFolder() throws Exception {
    assertThat(archiveFolder.exists()).isTrue();
    assertThat(isEmpty(archiveFolder.toPath())).isTrue();

    String name = "pj1";
    String projectName = createProjectOverAPI(name, null, true, null).get();
    File projectDir = verifyProjectRepoExists(Project.NameKey.parse(projectName));

    Path parentFolder =
        projectDir
            .toPath()
            .getParent()
            .resolve(PARENT_FOLDER)
            .resolve(projectName + Constants.DOT_GIT);
    parentFolder.toFile().mkdirs();
    assertThat(parentFolder.toFile().exists()).isTrue();
    assertThat(isEmpty(parentFolder)).isTrue();

    Files.move(projectDir.toPath(), parentFolder, REPLACE_EXISTING);
    assertThat(parentFolder.toFile().exists()).isTrue();
    assertThat(isEmpty(parentFolder)).isFalse();

    String cmd = createDeleteCommand(PARENT_FOLDER + "/" + projectName);
    adminSshSession.exec(cmd);

    assertThat(adminSshSession.getError()).isNull();
    assertThat(isEmpty(archiveFolder.toPath())).isFalse();
    assertThat(containsDeletedProject(archiveFolder.toPath().resolve(PARENT_FOLDER), name))
        .isTrue();
    assertThat(projectDir.exists()).isFalse();
    assertAllChangesDeletedInIndex();
    assertThat(parentFolder.toFile().exists()).isFalse();
  }

  private File verifyProjectRepoExists(Project.NameKey name) throws IOException {
    File projectDir;
    try (Repository projectRepo = repoManager.openRepository(name)) {
      projectDir = projectRepo.getDirectory();
    }
    assertThat(projectDir.exists()).isTrue();
    return projectDir;
  }

  private RestResponse httpDeleteProjectHelper(boolean force) throws Exception {
    requestScopeOperations.setApiUser(user.id());
    sender.clear();
    String endPoint = "/projects/" + project.get() + "/delete-project~delete";
    Input i = new Input();
    i.force = force;

    return adminRestSession.post(endPoint, i);
  }

  private String createDeleteCommand(String cmd, String... params) {
    return Joiner.on(" ")
        .join(PLUGIN, "delete", "--yes-really-delete", cmd, Joiner.on(" ").join(params));
  }

  private void pushTagOldCommitNotForce() throws Exception {
    testRepo = cloneProject(project, user);
    commitBuilder().ident(user.newIdent()).message("subject (" + System.nanoTime() + ")").create();
    String tagName = "v1_" + System.nanoTime();

    projectOperations
        .project(project)
        .forUpdate()
        .add(allow(Permission.SUBMIT).ref("refs/for/refs/heads/master").group(REGISTERED_USERS))
        .update();
    pushHead(testRepo, "refs/for/master%submit");

    String tagRef = RefNames.REFS_TAGS + tagName;
    PushResult r = pushHead(testRepo, tagRef, false, false);
    RemoteRefUpdate refUpdate = r.getRemoteUpdate(tagRef);
    assertWithMessage("LIGHTWEIGHT").that(refUpdate.getStatus()).isEqualTo(Status.OK);
  }

  private boolean isEmpty(Path dir) throws IOException {
    try (Stream<Path> dirStream = Files.list(dir)) {
      return !dirStream.iterator().hasNext();
    }
  }

  private boolean containsDeletedProject(Path dir, String projectName) throws IOException {
    try (Stream<Path> dirStream = Files.list(dir)) {
      return dirStream.anyMatch(d -> d.toString().contains(projectName));
    }
  }

  private void assertAllChangesDeletedInIndex() {
    assertThat(queryProvider.get().byProject(project)).isEmpty();
  }

  private void assertWatchRemoved() throws RestApiException {
    assertThat(gApi.accounts().self().getWatchedProjects()).isEmpty();
  }
}