/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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.apache.geode.test.junit.rules.examples;

import static org.assertj.core.api.Assertions.*;

import org.junit.ClassRule;
import org.junit.Rule;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runner.Result;
import org.junit.runners.model.Statement;

import org.apache.geode.test.junit.categories.UnitTest;
import org.apache.geode.test.junit.runners.TestRunner;

/**
 * Example usage of a rule as both a method {@literal @}Rule and a {@literal @}ClassRule.
 */
@Category(UnitTest.class)
public class RuleAndClassRuleTest {

  @Test
  public void usingRuleAsRuleAndClassRuleShouldInvokeBeforeClass() {
    Result result = TestRunner.runTest(UsingRuleAsRuleAndClassRule.class);

    assertThat(result.wasSuccessful()).isTrue();
    assertThat(UsingRuleAsRuleAndClassRule.staticRule.beforeClassInvoked).isEqualTo(true);
  }

  @Test
  public void usingRuleAsRuleAndClassRuleShouldInvokeAfterClass() {
    Result result = TestRunner.runTest(UsingRuleAsRuleAndClassRule.class);

    assertThat(result.wasSuccessful()).isTrue();
    assertThat(UsingRuleAsRuleAndClassRule.staticRule.afterClassInvoked).isEqualTo(true);
  }

  @Test
  public void usingRuleAsRuleAndClassRuleShouldInvokeBefore() {
    Result result = TestRunner.runTest(UsingRuleAsRuleAndClassRule.class);

    assertThat(result.wasSuccessful()).isTrue();
    assertThat(UsingRuleAsRuleAndClassRule.staticRule.beforeInvoked).isEqualTo(true);
  }

  @Test
  public void usingRuleAsRuleAndClassRuleShouldInvokeAfter() {
    Result result = TestRunner.runTest(UsingRuleAsRuleAndClassRule.class);

    assertThat(result.wasSuccessful()).isTrue();
    assertThat(UsingRuleAsRuleAndClassRule.staticRule.afterInvoked).isEqualTo(true);
  }

  /**
   * Implementation of TestRule that records the callbacks invoked on it. Used by
   * {@link UsingRuleAsRuleAndClassRule}.
   */
  public static class SpyRule implements TestRule {
    boolean beforeClassInvoked = false;
    boolean afterClassInvoked = false;
    boolean beforeInvoked = false;
    boolean afterInvoked = false;

    @Override
    public Statement apply(final Statement base, final Description description) {
      if (description.isTest()) {
        return statement(base);
      } else if (description.isSuite()) {
        return statementClass(base);
      }
      return base;
    }

    private Statement statement(final Statement base) {
      return new Statement() {
        @Override
        public void evaluate() throws Throwable {
          before();
          try {
            base.evaluate();
          } finally {
            after();
          }
        }
      };
    }

    private Statement statementClass(final Statement base) {
      return new Statement() {
        @Override
        public void evaluate() throws Throwable {
          beforeClass();
          try {
            base.evaluate();
          } finally {
            afterClass();
          }
        }
      };
    }

    private void beforeClass() {
      this.beforeClassInvoked = true;
    }

    private void afterClass() {
      this.afterClassInvoked = true;
    }

    private void before() {
      this.beforeInvoked = true;
    }

    private void after() {
      this.afterInvoked = true;
    }
  }

  /**
   * Used by the tests in {@link RuleAndClassRuleTest}.
   */
  public static class UsingRuleAsRuleAndClassRule {
    @ClassRule
    public static SpyRule staticRule = new SpyRule();
    @Rule
    public SpyRule rule = staticRule;

    @Test
    public void doTest() throws Exception {}
  }
}
