/*
 * Copyright 2000-2009 JetBrains s.r.o.
 *
 * 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 git4idea.update;

import com.intellij.openapi.components.ServiceManager;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.options.Configurable;
import com.intellij.openapi.progress.ProcessCanceledException;
import com.intellij.openapi.progress.ProgressIndicator;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Ref;
import com.intellij.openapi.vcs.FilePath;
import com.intellij.openapi.vcs.update.SequentialUpdatesContext;
import com.intellij.openapi.vcs.update.UpdateEnvironment;
import com.intellij.openapi.vcs.update.UpdateSession;
import com.intellij.openapi.vcs.update.UpdatedFiles;
import com.intellij.openapi.vfs.VirtualFile;
import git4idea.GitPlatformFacade;
import git4idea.GitVcs;
import git4idea.config.GitVcsSettings;
import git4idea.repo.GitRepositoryManager;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.Arrays;
import java.util.Collection;
import java.util.Set;

import static git4idea.GitUtil.*;

/**
 * Git update environment implementation. The environment does
 * {@code git pull -v} for each vcs root. Rebase variant is detected
 * and processed as well.
 */
public class GitUpdateEnvironment implements UpdateEnvironment {
  private final GitVcs myVcs;
  private final Project myProject;
  private final GitVcsSettings mySettings;
  @NotNull private final GitPlatformFacade myPlatformFacade;

  private static final Logger LOG = Logger.getInstance(GitUpdateEnvironment.class);

  public GitUpdateEnvironment(@NotNull Project project, @NotNull GitVcs vcs, GitVcsSettings settings) {
    myVcs = vcs;
    myProject = project;
    mySettings = settings;
    myPlatformFacade = ServiceManager.getService(project, GitPlatformFacade.class);
  }

  public void fillGroups(UpdatedFiles updatedFiles) {
    //unused, there are no custom categories yet
  }

  @NotNull
  public UpdateSession updateDirectories(@NotNull FilePath[] filePaths, UpdatedFiles updatedFiles, ProgressIndicator progressIndicator, @NotNull Ref<SequentialUpdatesContext> sequentialUpdatesContextRef) throws ProcessCanceledException {
    Set<VirtualFile> roots = gitRoots(Arrays.asList(filePaths));
    GitRepositoryManager repositoryManager = getRepositoryManager(myProject);
    final GitUpdateProcess gitUpdateProcess = new GitUpdateProcess(myProject, myPlatformFacade,
                                                                   progressIndicator, getRepositoriesFromRoots(repositoryManager, roots),
                                                                   updatedFiles);
    boolean result = gitUpdateProcess.update(GitUpdateProcess.UpdateMethod.READ_FROM_SETTINGS).isSuccess();
    return new GitUpdateSession(result);
  }


  public boolean validateOptions(Collection<FilePath> filePaths) {
    for (FilePath p : filePaths) {
      if (!isUnderGit(p)) {
        return false;
      }
    }
    return true;
  }

  @Nullable
  public Configurable createConfigurable(Collection<FilePath> files) {
    return new GitUpdateConfigurable(mySettings);
  }

}