// Copyright 2017 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 static com.google.common.truth.Truth.assertWithMessage;

import com.google.common.collect.ImmutableList;
import com.google.common.testing.TestLogHandler;
import com.google.common.truth.Correspondence;
import com.google.common.truth.FailureMetadata;
import com.google.common.truth.SimpleSubjectBuilder;
import com.google.common.truth.StringSubject;
import com.google.common.truth.Subject;
import google.registry.testing.TruthChainer.Which;
import java.util.List;
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> {

  private final TestLogHandler actual;

  public LogsSubject(FailureMetadata failureMetadata, TestLogHandler subject) {
    super(failureMetadata, subject);
    this.actual = subject;
  }

  private static final Correspondence<String, String> CONTAINS_CORRESPONDENCE =
      new Correspondence<String, String>() {
        @Override
        public boolean compare(String actual, String expected) {
          return actual.contains(expected);
        }

        @Override
        public String toString() {
          return "contains";
        }
      };

  private List<String> getMessagesAtLevel(Level level) {
    ImmutableList.Builder<String> builder = new ImmutableList.Builder<>();
    for (LogRecord log : actual.getStoredLogRecords()) {
      if (log.getLevel().equals(level)) {
        builder.add(log.getMessage());
      }
    }
    return builder.build();
  }

  public void hasNoLogsAtLevel(Level level) {
    check("atLevel(%s)", level).that(getMessagesAtLevel(level)).isEmpty();
  }

  public Which<StringSubject> hasLogAtLevelWithMessage(Level level, String message) {
    List<String> messagesAtLevel = getMessagesAtLevel(level);
    check("atLevel(%s)", level)
        .that(messagesAtLevel)
        .comparingElementsUsing(CONTAINS_CORRESPONDENCE)
        .contains(message);
    for (String messageCandidate : messagesAtLevel) {
      if (messageCandidate.contains(message)) {
        return new Which<>(
            assertWithMessage(String.format("log message at %s matching '%s'", level, message))
                .that(messageCandidate));
      }
    }
    throw new AssertionError("Message check passed yet matching message not found");
  }

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

@@ -1708,20 +1708,16 @@
 =%0A      
-new 
 Correspo
@@ -1726,99 +1726,22 @@
 ence
-%3CString, String%3E() %7B%0A        @Override%0A        public boolean compare(String 
+.from((
 actual,
- String
  exp
@@ -1747,34 +1747,18 @@
 pected) 
-%7B%0A          return
+-%3E
  actual.
@@ -1779,120 +1779,21 @@
 ted)
-;%0A        %7D%0A%0A        @Override%0A        public String toString() %7B%0A          return %22contains%22;%0A        %7D%0A      %7D
+, %22contains%22)
 ;%0A%0A 

Migrate Correspondence subclasses to instead call Correspondence.from()