/*
    *    Copyright 2009-2021 the original author or authors.
    *
    *    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.apache.ibatis.io;
  
  import static org.junit.jupiter.api.Assertions.*;
  
  import java.security.AccessController;
  import java.security.PrivilegedAction;
  import java.util.Set;
  
  import org.apache.ibatis.annotations.CacheNamespace;
  import org.junit.jupiter.api.BeforeAll;
  import org.junit.jupiter.api.Test;
  
  /**
   * Unit tests for {@link ResolverUtil}.
   *
   * @author Pi Chen
   * @since 3.5.2
   */
  
  class ResolverUtilTest {
    private static ClassLoader currentContextClassLoader;
  
    @BeforeAll
    static void setUp() {
      currentContextClassLoader = Thread.currentThread().getContextClassLoader();
    }
  
    @Test
    void getClasses() {
      assertEquals(new ResolverUtil<>().getClasses().size(), 0);
    }
  
    @Test
    void getClassLoader() {
      assertEquals(new ResolverUtil<>().getClassLoader(), currentContextClassLoader);
    }
  
    @Test
    void setClassLoader() {
      ResolverUtil resolverUtil = new ResolverUtil();
      AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
        resolverUtil.setClassLoader(new ClassLoader() {
        });
        return null;
      });
      assertNotEquals(resolverUtil.getClassLoader(), currentContextClassLoader);
    }
  
    @Test
    void findImplementationsWithNullPackageName() {
      ResolverUtil<VFS> resolverUtil = new ResolverUtil<>();
      resolverUtil.findImplementations(VFS.class, null);
      assertEquals(resolverUtil.getClasses().size(), 0);
    }
  
    @Test
    void findImplementations() {
      ResolverUtil<VFS> resolverUtil = new ResolverUtil<>();
      resolverUtil.findImplementations(VFS.class, "org.apache.ibatis.io");
      Set<Class<? extends VFS>> classSets = resolverUtil.getClasses();
      //org.apache.ibatis.io.VFS
      //org.apache.ibatis.io.DefaultVFS
      //org.apache.ibatis.io.JBoss6VFS
      assertEquals(classSets.size(), 3); //fail if add a new VFS implementation in this package!!!
      classSets.forEach(c -> assertTrue(VFS.class.isAssignableFrom(c)));
    }
  
    @Test
    void findAnnotatedWithNullPackageName() {
      ResolverUtil<Object> resolverUtil = new ResolverUtil<>();
      resolverUtil.findAnnotated(CacheNamespace.class, null);
      assertEquals(resolverUtil.getClasses().size(), 0);
    }
  
    @Test
    void findAnnotated() {
      ResolverUtil<Object> resolverUtil = new ResolverUtil<>();
      resolverUtil.findAnnotated(CacheNamespace.class, this.getClass().getPackage().getName());
      Set<Class<?>> classSets = resolverUtil.getClasses();
      //org.apache.ibatis.io.ResolverUtilTest.TestMapper
      assertEquals(classSets.size(), 1);
      classSets.forEach(c -> assertNotNull(c.getAnnotation(CacheNamespace.class)));
    }
  
   @Test
   void find() {
     ResolverUtil<VFS> resolverUtil = new ResolverUtil<>();
     resolverUtil.find(new ResolverUtil.IsA(VFS.class), "org.apache.ibatis.io");
     Set<Class<? extends VFS>> classSets = resolverUtil.getClasses();
     //org.apache.ibatis.io.VFS
     //org.apache.ibatis.io.DefaultVFS
     //org.apache.ibatis.io.JBoss6VFS
     assertEquals(classSets.size(), 3);
     classSets.forEach(c -> assertTrue(VFS.class.isAssignableFrom(c)));
   }
 
   @Test
   void getPackagePath() {
     ResolverUtil resolverUtil = new ResolverUtil();
     assertNull(resolverUtil.getPackagePath(null));
     assertEquals(resolverUtil.getPackagePath("org.apache.ibatis.io"), "org/apache/ibatis/io");
   }
 
   @Test
   void addIfMatching() {
     ResolverUtil<VFS> resolverUtil = new ResolverUtil<>();
     resolverUtil.addIfMatching(new ResolverUtil.IsA(VFS.class), "org/apache/ibatis/io/DefaultVFS.class");
     resolverUtil.addIfMatching(new ResolverUtil.IsA(VFS.class), "org/apache/ibatis/io/VFS.class");
     Set<Class<? extends VFS>> classSets = resolverUtil.getClasses();
     assertEquals(classSets.size(), 2);
     classSets.forEach(c -> assertTrue(VFS.class.isAssignableFrom(c)));
   }
 
   @Test
   void addIfNotMatching() {
     ResolverUtil<VFS> resolverUtil = new ResolverUtil<>();
     resolverUtil.addIfMatching(new ResolverUtil.IsA(VFS.class), "org/apache/ibatis/io/Xxx.class");
     assertEquals(resolverUtil.getClasses().size(), 0);
   }
 
   @Test
   void testToString() {
     ResolverUtil.IsA isa = new ResolverUtil.IsA(VFS.class);
     assertTrue(isa.toString().contains(VFS.class.getSimpleName()));
 
     ResolverUtil.AnnotatedWith annotatedWith = new ResolverUtil.AnnotatedWith(CacheNamespace.class);
     assertTrue(annotatedWith.toString().contains("@" + CacheNamespace.class.getSimpleName()));
   }
 
 
   @CacheNamespace(readWrite = false)
   private interface TestMapper {
     //test ResolverUtil.findAnnotated method
   }
 
 }