// Copyright (C) 2014 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.git.validators;

import com.google.gerrit.extensions.registration.DynamicSet;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.server.validators.ValidationException;
import com.google.inject.Inject;
import com.google.inject.assistedinject.Assisted;

import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.transport.PreUploadHook;
import org.eclipse.jgit.transport.ServiceMayNotContinueException;
import org.eclipse.jgit.transport.UploadPack;

import java.util.Collection;

public class UploadValidators implements PreUploadHook {

  private final DynamicSet<UploadValidationListener> uploadValidationListeners;
  private final Project project;
  private final Repository repository;
  private final String remoteHost;

  public interface Factory {
    UploadValidators create(Project project, Repository repository,
        String remoteAddress);
  }

  @Inject
  UploadValidators(
      DynamicSet<UploadValidationListener> uploadValidationListeners,
      @Assisted Project project, @Assisted Repository repository,
      @Assisted String remoteHost) {
    this.uploadValidationListeners = uploadValidationListeners;
    this.project = project;
    this.repository = repository;
    this.remoteHost = remoteHost;
  }

  @Override
  public void onSendPack(UploadPack up, Collection<? extends ObjectId> wants,
      Collection<? extends ObjectId> haves)
      throws ServiceMayNotContinueException {
    for (UploadValidationListener validator : uploadValidationListeners) {
      try {
        validator.onPreUpload(repository, project, remoteHost, up, wants, haves);
      } catch (ValidationException e) {
        throw new UploadValidationException(e.getMessage());
      }

    }
  }

  @Override
  public void onBeginNegotiateRound(UploadPack up,
      Collection<? extends ObjectId> wants, int cntOffered)
      throws ServiceMayNotContinueException {
  }

  @Override
  public void onEndNegotiateRound(UploadPack up,
      Collection<? extends ObjectId> wants, int cntCommon, int cntNotFound,
      boolean ready) throws ServiceMayNotContinueException {
  }
}