// Copyright 2016 The Nomulus Authors. All Rights Reserved.
//
// 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 google.registry.testing;

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

import com.google.common.testing.TestLogHandler;
import com.google.common.truth.AbstractVerb.DelegatedVerb;
import com.google.common.truth.FailureStrategy;
import com.google.common.truth.Subject;
import google.registry.testing.TruthChainer.And;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogRecord;

/** Utility methods for asserting things about logging {@link Handler} instances. */
public class LogsSubject extends Subject<LogsSubject, TestLogHandler> {

  /** A factory for instances of this subject. */
  private static class SubjectFactory
      extends ReflectiveSubjectFactory<TestLogHandler, LogsSubject> {}

  public LogsSubject(FailureStrategy strategy, TestLogHandler subject) {
    super(strategy, subject);
  }

  public And<LogsSubject> hasNoLogsAtLevel(Level level) {
    for (LogRecord log : actual().getStoredLogRecords()) {
      if (log.getLevel().equals(level)) {
        failWithRawMessage(
            "Not true that there are no logs at level %s. Found <%s>.", level, log.getMessage());
      }
    }
    return new And<>(this);
  }

  public And<LogsSubject> hasLogAtLevelWithMessage(Level level, String message) {
    boolean found = false;
    for (LogRecord log : actual().getStoredLogRecords()) {
      if (log.getLevel().equals(level) && log.getMessage().contains(message)) {
        found = true;
        break;
      }
    }
    if (!found) {
      failWithRawMessage("Found no logs at level %s with message %s.", level, message);
    }
    return new And<>(this);
  }

  public static DelegatedVerb<LogsSubject, TestLogHandler> assertAboutLogs() {
    return assertAbout(new SubjectFactory());
  }
}