/*
    * Copyright 2018 SPF4J.
    *
    * 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 org.spf4j.test.log;
  
  import java.util.concurrent.TimeUnit;
  import org.hamcrest.Matcher;
  import org.spf4j.base.TimeSource;
  
  /**
   * @author Zoltan Farkas
   */
  abstract class UncaughtExceptionAsserter implements LogAssert, UncaughtExceptionConsumer {
  
    private final Matcher<UncaughtExceptionDetail> matcher;
  
    private final Object sync;
  
    private int seen;
  
    private final long timeout;
    private final TimeUnit unit;
  
    UncaughtExceptionAsserter(final long timeout, final TimeUnit unit, final Matcher<UncaughtExceptionDetail> matcher) {
      this.matcher = matcher;
      this.seen = 0;
      this.sync = new Object();
      this.timeout = timeout;
      this.unit = unit;
    }
  
    @Override
    public void assertObservation() {
      long deadline = TimeSource.nanoTime() + unit.toNanos(timeout);
      try {
        synchronized (sync) {
          while (seen == 0) {
            long nanosToDeadline = deadline - TimeSource.nanoTime();
            if (nanosToDeadline <= 0) {
                throw new AssertionError("Not seen uncaught exception matching " + matcher);
            }
            TimeUnit.NANOSECONDS.timedWait(sync, nanosToDeadline);
          }
        }
      } catch (InterruptedException ex) {
        throw new AssertionError("Assertion interupted " + this, ex);
      }
    }
  
  
    @Override
    public boolean offer(final UncaughtExceptionDetail exDetail) {
      synchronized (sync) {
        if (matcher.matches(exDetail)) {
          seen++;
          sync.notifyAll();
          return true;
        }
        return false;
      }
    }
  
    @Override
    public String toString() {
      return "UncaughtExceptionAsserter{" + "matcher=" + matcher + '}';
    }
  
  }