/*
 * Copyright 2000-2014 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 jetbrains.buildServer.buildTriggers.vcs.mercurial.command;

import jetbrains.buildServer.vcs.VcsException;
import org.jetbrains.annotations.NotNull;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import static com.intellij.openapi.util.text.StringUtil.isEmpty;

public class StatusCommand extends VcsRootCommand {
  private String myFromId;
  private String myToId;
  private boolean myShowAllFiles = false;
  private boolean myHideStatus = false;

  public StatusCommand(@NotNull CommandSettings commandSettings,
                       @NotNull String hgPath,
                       @NotNull File workingDir,
                       @NotNull AuthSettings authSettings) {
    super(commandSettings, hgPath, workingDir, authSettings);
  }

  @NotNull
  public StatusCommand fromRevision(@NotNull ChangeSet fromCset) {
    myFromId = fromCset.getId();
    return this;
  }

  @NotNull
  public StatusCommand fromRevision(@NotNull String fromRevision) {
    myFromId = new ChangeSet(fromRevision).getId();
    return this;
  }

  @NotNull
  public StatusCommand toRevision(@NotNull ChangeSet toCset) {
    myToId = toCset.getId();
    return this;
  }

  @NotNull
  public StatusCommand toRevision(@NotNull String toRevision) {
    myToId = new ChangeSet(toRevision).getId();
    return this;
  }

  /**
   * Adds option -A (--all)
   * @return self
   */
  @NotNull
  public StatusCommand showAllFiles() {
    myShowAllFiles = true;
    return this;
  }

  /**
   * Adds option -n (--no-status)
   * @return self
   */
  @NotNull
  public StatusCommand hideStatus() {
    myHideStatus = true;
    return this;
  }

  @NotNull
  public List<FileStatus> call() throws VcsException {
    final MercurialCommandLine cli = createCommandLine();
    cli.addParameter("status");

    if (myShowAllFiles) {
      cli.addParameter("-A");
    }

    if (myHideStatus) {
      cli.addParameter("-n");
    }
    cli.addParameter("--rev");

    String from = myFromId;
    if (from == null)
      from = "0";

    String to = myToId;
    if (to == null) {
      to = "0";
    }
    cli.addParameter(from + ":" + to);

    final CommandResult res = runCommand(cli);
    return parseFiles(res.getRawStdout());
  }

  @NotNull
  private List<FileStatus> parseFiles(@NotNull final String stdout) {
    final List<FileStatus> result = new ArrayList<FileStatus>();
    String[] lines = stdout.split("\n");
    for (String line : lines) {
      if (isEmpty(line))
        continue;
      FileStatus fileStatus = parseLine(line);
      if (!myHideStatus && fileStatus.getStatus() == Status.UNKNOWN)
        continue;
      result.add(fileStatus);
    }
    return result;
  }

  @NotNull
  private FileStatus parseLine(@NotNull final String line) {
    if (myHideStatus) return new FileStatus(Status.UNKNOWN, line);

    final char modifier = line.charAt(0);
    final String path = line.substring(2);
    final Status status = Status.makeStatus(modifier);
    return new FileStatus(status, path);
  }

  @NotNull
  @Override
  protected String getDescription() {
    return "hg status";
  }
}