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// Copyright (C) 2012 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.change;

import static com.google.gerrit.server.CommentsUtil.COMMENT_ORDER;

import com.google.common.collect.ListMultimap;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.extensions.api.changes.NotifyHandling;
import com.google.gerrit.extensions.api.changes.RecipientType;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.reviewdb.client.ChangeMessage;
import com.google.gerrit.reviewdb.client.Comment;
import com.google.gerrit.reviewdb.client.PatchSet;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.git.SendEmailExecutor;
import com.google.gerrit.server.mail.send.CommentSender;
import com.google.gerrit.server.notedb.ChangeNotes;
import com.google.gerrit.server.patch.PatchSetInfoFactory;
import com.google.gerrit.server.util.LabelVote;
import com.google.gerrit.server.util.RequestContext;
import com.google.gerrit.server.util.ThreadLocalRequestContext;
import com.google.gwtorm.server.OrmException;
import com.google.gwtorm.server.SchemaFactory;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.ProvisionException;
import com.google.inject.assistedinject.Assisted;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class EmailReviewComments implements Runnable, RequestContext {
  private static final Logger log = LoggerFactory.getLogger(EmailReviewComments.class);

  public interface Factory {
    EmailReviewComments create(
        NotifyHandling notify,
        ListMultimap accountsToNotify,
        ChangeNotes notes,
        PatchSet patchSet,
        IdentifiedUser user,
        ChangeMessage message,
        List comments,
        String patchSetComment,
        List labels);
  }

  private final ExecutorService sendEmailsExecutor;
  private final PatchSetInfoFactory patchSetInfoFactory;
  private final CommentSender.Factory commentSenderFactory;
  private final SchemaFactory schemaFactory;
  private final ThreadLocalRequestContext requestContext;

  private final NotifyHandling notify;
  private final ListMultimap accountsToNotify;
  private final ChangeNotes notes;
  private final PatchSet patchSet;
  private final IdentifiedUser user;
  private final ChangeMessage message;
  private final List comments;
  private final String patchSetComment;
  private final List labels;
  private ReviewDb db;

  @Inject
  EmailReviewComments(
      @SendEmailExecutor ExecutorService executor,
      PatchSetInfoFactory patchSetInfoFactory,
      CommentSender.Factory commentSenderFactory,
      SchemaFactory schemaFactory,
      ThreadLocalRequestContext requestContext,
      @Assisted NotifyHandling notify,
      @Assisted ListMultimap accountsToNotify,
      @Assisted ChangeNotes notes,
      @Assisted PatchSet patchSet,
      @Assisted IdentifiedUser user,
      @Assisted ChangeMessage message,
      @Assisted List comments,
      @Nullable @Assisted String patchSetComment,
      @Assisted List labels) {
    this.sendEmailsExecutor = executor;
    this.patchSetInfoFactory = patchSetInfoFactory;
    this.commentSenderFactory = commentSenderFactory;
    this.schemaFactory = schemaFactory;
    this.requestContext = requestContext;
    this.notify = notify;
    this.accountsToNotify = accountsToNotify;
    this.notes = notes;
    this.patchSet = patchSet;
    this.user = user;
    this.message = message;
    this.comments = COMMENT_ORDER.sortedCopy(comments);
    this.patchSetComment = patchSetComment;
    this.labels = labels;
  }

  public void sendAsync() {
    @SuppressWarnings("unused")
    Future possiblyIgnoredError = sendEmailsExecutor.submit(this);
  }

  @Override
  public void run() {
    RequestContext old = requestContext.setContext(this);
    try {

      CommentSender cm = commentSenderFactory.create(notes.getProjectName(), notes.getChangeId());
      cm.setFrom(user.getAccountId());
      cm.setPatchSet(patchSet, patchSetInfoFactory.get(notes.getProjectName(), patchSet));
      cm.setChangeMessage(message.getMessage(), message.getWrittenOn());
      cm.setComments(comments);
      cm.setPatchSetComment(patchSetComment);
      cm.setLabels(labels);
      cm.setNotify(notify);
      cm.setAccountsToNotify(accountsToNotify);
      cm.send();
    } catch (Exception e) {
      log.error("Cannot email comments for " + patchSet.getId(), e);
    } finally {
      requestContext.setContext(old);
      if (db != null) {
        db.close();
        db = null;
      }
    }
  }

  @Override
  public String toString() {
    return "send-email comments";
  }

  @Override
  public CurrentUser getUser() {
    return user.getRealUser();
  }

  @Override
  public Provider getReviewDbProvider() {
    return new Provider() {
      @Override
      public ReviewDb get() {
        if (db == null) {
          try {
            db = schemaFactory.open();
          } catch (OrmException e) {
            throw new ProvisionException("Cannot open ReviewDb", e);
          }
        }
        return db;
      }
    };
  }
}