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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.update.context.RefUpdateContext.RefUpdateType.CHANGE_MODIFICATION;

import com.google.gerrit.entities.Project;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.extensions.restapi.RestApiException;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.account.AccountState;
import com.google.gerrit.server.config.ChangeCleanupConfig;
import com.google.gerrit.server.notedb.StoreSubmitRequirementsOp;
import com.google.gerrit.server.plugincontext.PluginItemContext;
import com.google.gerrit.server.query.change.ChangeData;
import com.google.gerrit.server.update.BatchUpdate;
import com.google.gerrit.server.update.UpdateException;
import com.google.gerrit.server.update.context.RefUpdateContext;
import com.google.gerrit.server.util.time.TimeUtil;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.util.Collection;

@Singleton
public class BatchAbandon {
  private final AbandonOp.Factory abandonOpFactory;
  private final ChangeCleanupConfig cfg;
  private final PluginItemContext accountPatchReviewStore;
  private final StoreSubmitRequirementsOp.Factory storeSubmitRequirementsOpFactory;

  @Inject
  BatchAbandon(
      AbandonOp.Factory abandonOpFactory,
      ChangeCleanupConfig cfg,
      PluginItemContext accountPatchReviewStore,
      StoreSubmitRequirementsOp.Factory storeSubmitRequirementsOpFactory) {
    this.abandonOpFactory = abandonOpFactory;
    this.cfg = cfg;
    this.accountPatchReviewStore = accountPatchReviewStore;
    this.storeSubmitRequirementsOpFactory = storeSubmitRequirementsOpFactory;
  }

  /**
   * If an extension has more than one changes to abandon that belong to the same project, they
   * should use the batch instead of abandoning one by one.
   *
   * It's the caller's responsibility to ensure that all jobs inside the same batch have the
   * matching project from its ChangeData. Violations will result in a ResourceConflictException.
   */
  public void batchAbandon(
      BatchUpdate.Factory updateFactory,
      Project.NameKey project,
      CurrentUser user,
      Collection changes,
      String msgTxt,
      NotifyResolver.Result notify)
      throws RestApiException, UpdateException {
    if (changes.isEmpty()) {
      return;
    }
    AccountState accountState = user.isIdentifiedUser() ? user.asIdentifiedUser().state() : null;
    try (RefUpdateContext ctx = RefUpdateContext.open(CHANGE_MODIFICATION)) {
      try (BatchUpdate u = updateFactory.create(project, user, TimeUtil.now())) {
        u.setNotify(notify);
        for (ChangeData change : changes) {
          if (!project.equals(change.project())) {
            throw new ResourceConflictException(
                String.format(
                    "Project name \"%s\" doesn't match \"%s\"",
                    change.project().get(), project.get()));
          }
          u.addOp(change.getId(), abandonOpFactory.create(accountState, msgTxt));
          u.addOp(
              change.getId(),
              storeSubmitRequirementsOpFactory.create(
                  change.submitRequirements().values(), change));
        }
        u.execute();

        if (cfg.getCleanupAccountPatchReview()) {
          cleanupAccountPatchReview(changes);
        }
      }
    }
  }

  public void batchAbandon(
      BatchUpdate.Factory updateFactory,
      Project.NameKey project,
      CurrentUser user,
      Collection changes,
      String msgTxt)
      throws RestApiException, UpdateException {
    batchAbandon(updateFactory, project, user, changes, msgTxt, NotifyResolver.Result.all());
  }

  public void batchAbandon(
      BatchUpdate.Factory updateFactory,
      Project.NameKey project,
      CurrentUser user,
      Collection changes)
      throws RestApiException, UpdateException {
    batchAbandon(updateFactory, project, user, changes, "", NotifyResolver.Result.all());
  }

  private void cleanupAccountPatchReview(Collection changes) {
    for (ChangeData change : changes) {
      accountPatchReviewStore.run(s -> s.clearReviewed(change.getId()));
    }
  }
}