// 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.change;

import com.google.common.base.Optional;
import com.google.gerrit.common.data.Capable;
import com.google.gerrit.extensions.registration.DynamicMap;
import com.google.gerrit.extensions.restapi.AcceptsPost;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.ChildCollection;
import com.google.gerrit.extensions.restapi.IdString;
import com.google.gerrit.extensions.restapi.NotImplementedException;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
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.extensions.restapi.RestView;
import com.google.gerrit.server.edit.ChangeEdit;
import com.google.gerrit.server.edit.ChangeEditUtil;
import com.google.gerrit.server.git.UpdateException;
import com.google.gerrit.server.project.NoSuchChangeException;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.Singleton;

import java.io.IOException;

@Singleton
public class PublishChangeEdit implements
    ChildCollection<ChangeResource, ChangeEditResource>,
    AcceptsPost<ChangeResource> {

  private final Publish publish;

  @Inject
  PublishChangeEdit(Publish publish) {
    this.publish = publish;
  }

  @Override
  public DynamicMap<RestView<ChangeEditResource>> views() {
    throw new NotImplementedException();
  }

  @Override
  public RestView<ChangeResource> list() {
    throw new NotImplementedException();
  }

  @Override
  public ChangeEditResource parse(ChangeResource parent, IdString id) {
    throw new NotImplementedException();
  }

  @SuppressWarnings("unchecked")
  @Override
  public Publish post(ChangeResource parent) throws RestApiException {
    return publish;
  }

  @Singleton
  public static class Publish implements RestModifyView<ChangeResource, Publish.Input> {
    public static class Input {
    }

    private final ChangeEditUtil editUtil;

    @Inject
    Publish(ChangeEditUtil editUtil) {
      this.editUtil = editUtil;
    }

    @Override
    public Response<?> apply(ChangeResource rsrc, Publish.Input in)
        throws NoSuchChangeException, IOException, OrmException,
        RestApiException, UpdateException {
      Capable r =
          rsrc.getControl().getProjectControl().canPushToAtLeastOneRef();
      if (r != Capable.OK) {
        throw new AuthException(r.getMessage());
      }

      Optional<ChangeEdit> edit = editUtil.byChange(rsrc.getChange());
      if (!edit.isPresent()) {
        throw new ResourceConflictException(String.format(
            "no edit exists for change %s",
            rsrc.getChange().getChangeId()));
      }
      editUtil.publish(edit.get());
      return Response.none();
    }
  }
}