// Copyright (C) 2017 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.edit.tree;

import static com.google.common.truth.Truth.assertAbout;

import com.google.common.io.CharStreams;
import com.google.common.truth.FailureStrategy;
import com.google.common.truth.StringSubject;
import com.google.common.truth.Subject;
import com.google.common.truth.SubjectFactory;
import com.google.common.truth.Truth;
import com.google.gerrit.extensions.restapi.RawInput;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;

public class ChangeFileContentModificationSubject
    extends Subject<ChangeFileContentModificationSubject, ChangeFileContentModification> {

  private static final SubjectFactory<
          ChangeFileContentModificationSubject, ChangeFileContentModification>
      MODIFICATION_SUBJECT_FACTORY =
          new SubjectFactory<
              ChangeFileContentModificationSubject, ChangeFileContentModification>() {
            @Override
            public ChangeFileContentModificationSubject getSubject(
                FailureStrategy failureStrategy, ChangeFileContentModification modification) {
              return new ChangeFileContentModificationSubject(failureStrategy, modification);
            }
          };

  public static ChangeFileContentModificationSubject assertThat(
      ChangeFileContentModification modification) {
    return assertAbout(MODIFICATION_SUBJECT_FACTORY).that(modification);
  }

  private ChangeFileContentModificationSubject(
      FailureStrategy failureStrategy, ChangeFileContentModification modification) {
    super(failureStrategy, modification);
  }

  public StringSubject filePath() {
    isNotNull();
    return Truth.assertThat(actual().getFilePath()).named("filePath");
  }

  public StringSubject newContent() throws IOException {
    isNotNull();
    RawInput newContent = actual().getNewContent();
    Truth.assertThat(newContent).named("newContent").isNotNull();
    String contentString =
        CharStreams.toString(
            new InputStreamReader(newContent.getInputStream(), StandardCharsets.UTF_8));
    return Truth.assertThat(contentString).named("newContent");
  }
}