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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.restapi.project;

import com.google.common.base.Strings;
import com.google.gerrit.extensions.api.projects.DashboardInfo;
import com.google.gerrit.extensions.api.projects.SetDashboardInput;
import com.google.gerrit.extensions.restapi.BadRequestException;
import com.google.gerrit.extensions.restapi.IdString;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
import com.google.gerrit.extensions.restapi.Response;
import com.google.gerrit.extensions.restapi.RestApiException;
import com.google.gerrit.extensions.restapi.RestModifyView;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gerrit.server.project.DashboardResource;
import com.google.gerrit.server.project.ProjectConfig;
import com.google.gerrit.server.project.ProjectResource;
import com.google.inject.Inject;
import com.google.inject.Provider;
import java.io.IOException;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.errors.RepositoryNotFoundException;
import org.kohsuke.args4j.Option;

class SetDefaultDashboard implements RestModifyView {
  private final DashboardsCollection dashboards;
  private final Provider get;
  private final RepoMetaDataUpdater repoMetaDataUpdater;

  @Option(name = "--inherited", usage = "set dashboard inherited by children")
  boolean inherited;

  @Inject
  SetDefaultDashboard(
      DashboardsCollection dashboards,
      Provider get,
      RepoMetaDataUpdater repoMetaDataUpdater) {
    this.dashboards = dashboards;
    this.get = get;
    this.repoMetaDataUpdater = repoMetaDataUpdater;
  }

  @Override
  public Response apply(DashboardResource rsrc, SetDashboardInput input)
      throws RestApiException, IOException, PermissionBackendException {
    if (input == null) {
      input = new SetDashboardInput(); // Delete would set input to null.
    }
    input.id = Strings.emptyToNull(input.id);

    DashboardResource target = null;
    if (input.id != null) {
      try {
        target =
            dashboards.parse(
                new ProjectResource(rsrc.getProjectState(), rsrc.getUser()),
                IdString.fromUrl(input.id));
      } catch (ResourceNotFoundException e) {
        throw new BadRequestException("dashboard " + input.id + " not found", e);
      } catch (ConfigInvalidException e) {
        throw new ResourceConflictException(e.getMessage());
      }
    }
    String defaultMessage =
        input.id == null
            ? "Removed default dashboard.\n"
            : String.format("Changed default dashboard to %s.\n", input.id);

    try (var configUpdater =
        repoMetaDataUpdater.configUpdater(
            rsrc.getProjectState().getNameKey(), input.commitMessage, defaultMessage)) {
      ProjectConfig config = configUpdater.getConfig();
      String id = input.id;
      if (inherited) {
        config.updateProject(p -> p.setDefaultDashboard(id));
      } else {
        config.updateProject(p -> p.setLocalDefaultDashboard(id));
      }
      configUpdater.commitConfigUpdate();

      if (target != null) {
        Response response = get.get().apply(target);
        response.value().isDefault = true;
        return response;
      }
      return Response.none();
    } catch (RepositoryNotFoundException notFound) {
      throw new ResourceNotFoundException(rsrc.getProjectState().getProject().getName(), notFound);
    } catch (ConfigInvalidException e) {
      throw new ResourceConflictException(
          String.format("invalid project.config: %s", e.getMessage()));
    }
  }
}