// 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.google.gerrit.server.restapi.project;

import static com.google.gerrit.server.update.context.RefUpdateContext.RefUpdateType.TAG_MODIFICATION;

import com.google.common.base.Preconditions;
import com.google.gerrit.extensions.common.Input;
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.RefUtil;
import com.google.gerrit.server.project.TagResource;
import com.google.gerrit.server.update.context.RefUpdateContext;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.io.IOException;
import org.eclipse.jgit.lib.Constants;

@Singleton
public class DeleteTag implements RestModifyView<TagResource, Input> {

  private final DeleteRef deleteRef;

  @Inject
  DeleteTag(DeleteRef deleteRef) {
    this.deleteRef = deleteRef;
  }

  @Override
  public Response<?> apply(TagResource resource, Input input)
      throws RestApiException, IOException, PermissionBackendException {
    String tag = RefUtil.normalizeTagRef(resource.getTagInfo().ref);

    Preconditions.checkState(tag.startsWith(Constants.R_TAGS));

    try (RefUpdateContext ctx = RefUpdateContext.open(TAG_MODIFICATION)) {
      deleteRef.deleteSingleRef(resource.getProjectState(), tag);
    }
    return Response.none();
  }
}