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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.change;

import com.google.gerrit.entities.HumanComment;
import com.google.gerrit.extensions.registration.DynamicMap;
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.ResourceNotFoundException;
import com.google.gerrit.extensions.restapi.RestView;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.DraftCommentsReader;
import com.google.gerrit.server.change.DraftCommentResource;
import com.google.gerrit.server.change.RevisionResource;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;

@Singleton
public class DraftComments implements ChildCollection {
  private final DynamicMap> views;
  private final Provider user;
  private final ListRevisionDrafts list;
  private final DraftCommentsReader draftCommentsReader;

  @Inject
  DraftComments(
      DynamicMap> views,
      Provider user,
      ListRevisionDrafts list,
      DraftCommentsReader draftCommentsReader) {
    this.views = views;
    this.user = user;
    this.list = list;
    this.draftCommentsReader = draftCommentsReader;
  }

  @Override
  public DynamicMap> views() {
    return views;
  }

  @Override
  public ListRevisionDrafts list() throws AuthException {
    checkIdentifiedUser();
    return list;
  }

  @Override
  public DraftCommentResource parse(RevisionResource rev, IdString id)
      throws ResourceNotFoundException, AuthException {
    checkIdentifiedUser();
    String uuid = id.get();
    for (HumanComment c :
        draftCommentsReader.getDraftsByPatchSetAndDraftAuthor(
            rev.getNotes(), rev.getPatchSet().id(), rev.getAccountId())) {
      if (uuid.equals(c.key.uuid)) {
        return new DraftCommentResource(rev, c);
      }
    }
    throw new ResourceNotFoundException(id);
  }

  private void checkIdentifiedUser() throws AuthException {
    if (!user.get().isIdentifiedUser()) {
      throw new AuthException("drafts only available to authenticated users");
    }
  }
}