content: package act.mail;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import act.ActTestBase;
  import act.app.AppByteCodeScanner;
  import act.app.AppCodeScannerManager;
  import act.app.TestingAppClassLoader;
  import act.asm.ClassReader;
  import act.asm.ClassVisitor;
  import act.asm.ClassWriter;
  import act.asm.util.TraceClassVisitor;
  import act.mail.bytecode.MailerByteCodeScanner;
  import act.mail.bytecode.MailerEnhancer;
  import act.mail.meta.MailerClassMetaInfo;
  import act.mail.meta.MailerClassMetaInfoHolder;
  import act.mail.meta.MailerClassMetaInfoManager;
  import act.util.Files;
  import org.junit.Before;
  import org.junit.Test;
  import org.mockito.ArgumentCaptor;
  import org.osgl.$;
  import org.osgl.util.C;
  import org.osgl.util.IO;
  import org.osgl.util.S;
  import testapp.util.InvokeLog;
  import testapp.util.InvokeLogFactory;
  
  import java.io.*;
  import java.lang.reflect.Field;
  import java.lang.reflect.Method;
  import java.util.List;
  
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  public class MailerEnhancerTest extends ActTestBase implements MailerClassMetaInfoHolder {
  
      public static final String TMPL_PATH = "/path/to/template";
  
      protected String mailerName;
      protected Class<?> mailerClass;
      protected Object mailer;
      protected Method m;
      protected InvokeLog invokeLog;
      private TestingAppClassLoader classLoader;
      private AppCodeScannerManager scannerManager;
      private AppByteCodeScanner scanner;
      protected MailerClassMetaInfoManager infoSrc;
      private File base;
  
      @Override
      public MailerClassMetaInfo mailerClassMetaInfo(String className) {
          return infoSrc.mailerMetaInfo(className);
      }
  
      @Before
      public void setup() throws Exception {
          super.setup();
          invokeLog = mock(InvokeLog.class);
          scanner = new MailerByteCodeScanner();
          scanner.setApp(mockApp);
          classLoader = new TestingAppClassLoader(mockApp);
          infoSrc = classLoader.mailerClassMetaInfoManager();
          scannerManager = mock(AppCodeScannerManager.class);
          when(mockApp.classLoader()).thenReturn(classLoader);
          when(mockApp.scannerManager()).thenReturn(scannerManager);
          C.List<AppByteCodeScanner> scanners = C.list(scanner);
          when(scannerManager.byteCodeScanners()).thenReturn(scanners);
          InvokeLogFactory.set(invokeLog);
          base = new File("./target/test-classes");
      }
  
      @Test
      public void sendX() throws Exception {
          ArgumentCaptor<MailerContext> captor = ArgumentCaptor.forClass(MailerContext.class);
          //TODO verify MailerContext operations during sendX call
  //        PowerMockito.mockStatic(Mailer.Util.class);
  //        PowerMockito.verifyStatic();
          prepare("MyMailer");
          m = method("sendX", String.class, String.class);
          m.invoke(mailer, "username", "password");
      }
  
      @Test
      public void sendY() throws Exception {
          ArgumentCaptor<MailerContext> captor = ArgumentCaptor.forClass(MailerContext.class);
          //TODO verify MailerContext operations during sendX call
  //        PowerMockito.mockStatic(Mailer.Util.class);
  //        PowerMockito.verifyStatic();
          prepare("MyMailer");
          m = method("sendY", int.class, long.class);
          m.invoke(mailer, 1, 5l);
          // todo verify the jobManager.now() return
      }
  
      private void prepare(String className) throws Exception {
          mailerName = "testapp.mail." + className;
          scan(mailerName);
          mailerClass = new TestAppClassLoader().loadClass(mailerName);
          mailer = $.newInstance(mailerClass);
      }
  
      private Method method(String name, Class... types) throws Exception {
          return mailerClass.getDeclaredMethod(name, types);
      }
  
      private Field field(String name) throws Exception {
          Field f = mailerClass.getField(name);
          f.setAccessible(true);
          return f;
      }
  
      private void scan(String className) {
          List<File> files = Files.filter(base, _F.SAFE_CLASS);
          for (File file : files) {
              classLoader.preloadClassFile(base, file);
          }
          //File file = new File(base, ClassNames.classNameToClassFileName(className));
          //classLoader.preloadClassFile(base, file);
          classLoader.scan();
      }
  
      private class TestAppClassLoader extends ClassLoader {
          @Override
          protected synchronized Class<?> loadClass(final String name,
                                                    final boolean resolve) throws ClassNotFoundException {
              if (!name.startsWith("testapp.")) {
                  return super.loadClass(name, resolve);
              }
  
              // gets an input stream to read the bytecode of the class
              String cn = name.replace('.', '/');
              String resource = cn + ".class";
              InputStream is = getResourceAsStream(resource);
              byte[] b;
  
              // adapts the class on the fly
              try {
                  ClassReader cr = new ClassReader(is);
                  ClassWriter cw = new ClassWriter(0);
                  MailerEnhancer enhancer = new MailerEnhancer(cw, MailerEnhancerTest.this);
                  cr.accept(enhancer, 0);
                  b = cw.toByteArray();
                  OutputStream os1 = new FileOutputStream("/tmp/" + S.afterLast(cn, "/") + ".class");
                  IO.write(b, os1);
                  cr = new ClassReader(b);
                  cw = new ClassWriter(0);
                  OutputStream os2 = new FileOutputStream("/tmp/" + S.afterLast(cn, "/") + ".java");
                  ClassVisitor tv = new TraceClassVisitor(cw, new PrintWriter(os2));
                  cr.accept(tv, 0);
              } catch (Exception e) {
                  throw new ClassNotFoundException(name, e);
              }
  
              // returns the adapted class
              return defineClass(name, b, 0, b.length);
          }
  
      }
  
      private enum _F {
          ;
          static $.Predicate<String> SYS_CLASS_NAME = new $.Predicate<String>() {
              @Override
              public boolean test(String s) {
                  return s.startsWith("java") || s.startsWith("org.osgl.");
              }
          };
          static $.Predicate<String> SAFE_CLASS = S.F.endsWith(".class").and(SYS_CLASS_NAME.negate());
      }
  }
  