// 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.analytics

import java.io.{OutputStream, PrintWriter}

import com.google.gerrit.extensions.restapi.{BinaryResult, Response, RestReadView}
import com.google.gerrit.server.git.GitRepositoryManager
import com.google.gerrit.server.project.ProjectResource
import com.google.inject.Inject
import com.googlesource.gerrit.plugins.analytics.ManagedResource.use

class ContributorsResource @Inject()(val repoManager: GitRepositoryManager,
                                     val userSummary: UserSummaryExport,
                                     val gsonFmt: GsonFormatter) extends RestReadView[ProjectResource] {

  private[analytics] class JsonStreamedResult[T](val committers: TraversableOnce[T]) extends BinaryResult {
    override def writeTo(os: OutputStream) {
      use(new PrintWriter(os)) { gsonFmt.format(committers, _) }
    }
  }

  override def apply(projectRes: ProjectResource): Response[BinaryResult] =
    Response.ok(new JsonStreamedResult[UserActivitySummary](get(projectRes)))

  def get(projectRes: ProjectResource): TraversableOnce[UserActivitySummary] =
    use(repoManager.openRepository(projectRes.getNameKey)) { userSummary.getCommitters }
}