package jetbrains.buildServer.buildTriggers.vcs.mercurial;

import jetbrains.buildServer.buildTriggers.vcs.mercurial.command.HgVcsRoot;
import jetbrains.buildServer.util.FileUtil;
import jetbrains.buildServer.util.StringUtil;
import jetbrains.buildServer.vcs.VcsException;
import jetbrains.buildServer.vcs.VcsRoot;
import org.jetbrains.annotations.NotNull;

import java.io.File;
import java.io.IOException;

/**
 * @author dmitry.neverov
 */
public class HgVcsRootFactory {

  private File myDefaultWorkFolderParent;

  public HgVcsRootFactory(@NotNull final ServerPluginConfig config) {
    myDefaultWorkFolderParent = config.getCachesDir();
  }


  @NotNull
  public HgVcsRoot createHgRoot(@NotNull VcsRoot root) throws VcsException {
    HgVcsRoot hgRoot = new HgVcsRoot(root);
    String customClonePath = hgRoot.getCustomClonePath();
    if (StringUtil.isEmptyOrSpaces(customClonePath))
      return hgRoot;

    File canonicalCustomCloneDir = getCanonicalCustomCloneDir(customClonePath);
    if (myDefaultWorkFolderParent.equals(canonicalCustomCloneDir))
      return hgRoot;

    createClonedRepositoryParentDir(canonicalCustomCloneDir);

    // take last part of repository path
    String repPath = hgRoot.getRepository();
    String[] splitted = repPath.split("[/\\\\]");
    if (splitted.length > 0) {
      repPath = splitted[splitted.length-1];
    }

    File customWorkingDir = getCustomWorkingDir(canonicalCustomCloneDir, repPath);
    hgRoot.setCustomWorkingDir(customWorkingDir);

    return hgRoot;
  }

  private File getCustomWorkingDir(@NotNull File parentCloneDir, @NotNull String repoPath) throws VcsException {
    File customWorkingDir = new File(parentCloneDir, repoPath);
    customWorkingDir.mkdirs();
    if (customWorkingDir.isDirectory())
      return customWorkingDir;

    customWorkingDir = new File(parentCloneDir, FileUtil.fixDirectoryName(repoPath));
    customWorkingDir.mkdirs();
    if (customWorkingDir.isDirectory())
      return customWorkingDir;

    try {
      return HgFileUtil.createTempDir(parentCloneDir);
    } catch (IOException e) {
      throw new VcsException(e);
    }
  }

  private File getCanonicalCustomCloneDir(@NotNull String customClonePath) throws VcsException {
    try {
      return new File(customClonePath).getCanonicalFile();
    } catch (IOException e) {
      throw new VcsException("Cannot resolve custom clone path", e);
    }
  }

  private void createClonedRepositoryParentDir(final File parentDir) throws VcsException {
    if (!parentDir.exists() && !parentDir.mkdirs())
      throw new VcsException("Failed to create parent directory for cloned repository: " + parentDir.getAbsolutePath());
  }

}