/*
    * Copyright 2020 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.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import javax.annotation.concurrent.ThreadSafe;
  import org.hamcrest.Description;
  import org.hamcrest.Matcher;
  import org.hamcrest.StringDescription;
  
  /**
   * @author Zoltan Farkas
   */
  @ThreadSafe
  public final class ExactLogStreamMatcher implements LogStreamMatcher {
  
    private  final Matcher<TestLogRecord>[] matchers;
  
    private final List<TestLogRecord> matched;
  
    private int at;
  
    private final boolean assertSeen;
  
    private final Object sync;
  
    public ExactLogStreamMatcher(final boolean assertSeen, final Matcher<TestLogRecord>... matchers) {
      if (matchers.length < 1) {
        throw new IllegalArgumentException("You need to provide at least a matcher " + Arrays.toString(matchers));
      }
      this.matchers = matchers;
      this.matched = new ArrayList<>(matchers.length);
      this.at = 0;
      this.assertSeen = assertSeen;
      this.sync = new Object();
    }
  
  
    @Override
    public boolean isMatched() {
      if (assertSeen) {
        synchronized (sync) {
          return at >= matchers.length;
        }
      } else {
        synchronized (sync) {
          return at < matchers.length;
        }
      }
    }
  
    @Override
    public void accept(final TestLogRecord record) {
      synchronized (sync) {
        if (at < matchers.length && matchers[at].matches(record)) {
          at++;
          record.attach(Attachments.ASSERTED);
          matched.add(record);
        }
      }
    }
  
    @Override
    public void describeTo(final Description description) {
      if (assertSeen) {
        description.appendText("Expected: ");
      } else {
        description.appendText("Not expected: ");
      }
      matchers[0].describeTo(description);
      for (int i = 1; i < matchers.length; i++) {
        description.appendText("\n");
        matchers[i].describeTo(description);
      }
      description.appendText("\n");
      description.appendValueList("Matched:\n", ",", " logs", matched);
    }
  
    @Override
    public String toString() {
      StringDescription sd = new StringDescription();
      describeTo(sd);
      return sd.toString();
    }
 
 }