// Copyright (C) 2016 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.googlesource.gerrit.plugins.reviewers;

import com.google.gerrit.entities.Account;
import com.google.gerrit.exceptions.StorageException;
import com.google.gerrit.extensions.client.ReviewerState;
import com.google.gerrit.extensions.common.AccountVisibility;
import com.google.gerrit.extensions.common.SuggestedReviewerInfo;
import com.google.gerrit.extensions.restapi.BadRequestException;
import com.google.gerrit.extensions.restapi.Response;
import com.google.gerrit.extensions.restapi.RestReadView;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.gerrit.server.permissions.PermissionBackend;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gerrit.server.permissions.ProjectPermission;
import com.google.gerrit.server.project.ProjectResource;
import com.google.gerrit.server.restapi.change.ReviewersUtil;
import com.google.gerrit.server.restapi.change.ReviewersUtil.VisibilityControl;
import com.google.gerrit.server.restapi.change.SuggestReviewers;
import com.google.inject.Inject;
import java.io.IOException;
import java.util.List;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.lib.Config;

/** Implements a project suggest REST end-point. */
public class SuggestProjectReviewers extends SuggestReviewers
    implements RestReadView<ProjectResource> {
  private final PermissionBackend permissionBackend;

  @Inject
  SuggestProjectReviewers(
      AccountVisibility av,
      @GerritServerConfig Config cfg,
      ReviewersUtil reviewersUtil,
      PermissionBackend permissionBackend) {
    super(av, cfg, reviewersUtil);
    this.permissionBackend = permissionBackend;
  }

  @Override
  public Response<List<SuggestedReviewerInfo>> apply(ProjectResource rsrc)
      throws BadRequestException, StorageException, IOException, ConfigInvalidException,
          PermissionBackendException {
    return Response.ok(
        reviewersUtil.suggestReviewers(
            ReviewerState.REVIEWER, null, this, rsrc.getProjectState(), getVisibility(rsrc), true));
  }

  private VisibilityControl getVisibility(final ProjectResource rsrc) {
    return new VisibilityControl() {
      @Override
      public boolean isVisibleTo(Account.Id account) {
        return permissionBackend
            .absentUser(account)
            .project(rsrc.getNameKey())
            .testOrFalse(ProjectPermission.ACCESS);
      }
    };
  }
}