// Copyright (C) 2009 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.google.gerrit.server.mail;

import com.google.gerrit.reviewdb.Change;
import com.google.gerrit.reviewdb.Patch;
import com.google.gerrit.reviewdb.PatchLineComment;
import com.google.gerrit.server.patch.PatchFile;
import com.google.gerrit.server.patch.PatchList;
import com.google.inject.Inject;
import com.google.inject.assistedinject.Assisted;

import org.eclipse.jgit.errors.RepositoryNotFoundException;
import org.eclipse.jgit.lib.Repository;

import java.io.IOException;
import java.util.Collections;
import java.util.List;

/** Send comments, after the author of them hit used Publish Comments in the UI. */
public class CommentSender extends ReplyToChangeSender {
  public static interface Factory {
    public CommentSender create(Change change);
  }

  private List<PatchLineComment> inlineComments = Collections.emptyList();

  @Inject
  public CommentSender(@Assisted Change c) {
    super(c, "comment");
  }

  public void setPatchLineComments(final List<PatchLineComment> plc) {
    inlineComments = plc;
  }

  @Override
  protected void init() {
    super.init();

    ccAllApprovals();
    bccStarredBy();
    bccWatchesNotifyAllComments();
  }

  @Override
  protected void format() {
    if (!"".equals(getCoverLetter()) || !inlineComments.isEmpty()) {
      appendText("Comments on Patch Set " + patchSet.getPatchSetId() + ":\n");
      appendText("\n");
      formatCoverLetter();
      formatInlineComments();
      if (getChangeUrl() != null) {
        appendText("To respond, visit " + getChangeUrl() + "\n");
        appendText("\n");
      }
    }
  }

  private void formatInlineComments() {
    final Repository repo = getRepository();
    try {
      final PatchList patchList = repo != null ? getPatchList() : null;

      Patch.Key currentFileKey = null;
      PatchFile currentFileData = null;
      for (final PatchLineComment c : inlineComments) {
        final Patch.Key pk = c.getKey().getParentKey();
        final int lineNbr = c.getLine();
        final short side = c.getSide();

        if (!pk.equals(currentFileKey)) {
          appendText("....................................................\n");
          appendText("File ");
          appendText(pk.get());
          appendText("\n");
          currentFileKey = pk;

          if (patchList != null) {
            try {
              currentFileData =
                  new PatchFile(repo, patchList, pk.getFileName());
            } catch (IOException e) {
              // Don't quote the line if we can't load it.
            }
          } else {
            currentFileData = null;
          }
        }

        appendText("Line " + lineNbr);
        if (currentFileData != null) {
          try {
            final String lineStr = currentFileData.getLine(side, lineNbr);
            appendText(": ");
            appendText(lineStr);
          } catch (Throwable cce) {
            // Don't quote the line if we can't safely convert it.
          }
        }
        appendText("\n");

        appendText(c.getMessage().trim());
        appendText("\n\n");
      }
    } finally {
      if (repo != null) {
        repo.close();
      }
    }
  }

  private Repository getRepository() {
    try {
      return server.openRepository(projectName);
    } catch (RepositoryNotFoundException e) {
      return null;
    }
  }
}