/*
    * 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.maven.shared.dependency.analyzer.asm;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.objectweb.asm.AnnotationVisitor;
  import org.objectweb.asm.Attribute;
  import org.objectweb.asm.FieldVisitor;
  import org.objectweb.asm.Label;
  import org.objectweb.asm.MethodVisitor;
  import org.objectweb.asm.Opcodes;
  import org.objectweb.asm.Type;
  import org.objectweb.asm.signature.SignatureVisitor;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  /**
   * Tests <code>DependencyVisitor</code>.
   *
   * @author <a href="mailto:markhobson@gmail.com">Mark Hobson</a>
   */
  class DependencyVisitorTest {
      private final ResultCollector resultCollector = new ResultCollector();
      private DefaultClassVisitor visitor;
      private MethodVisitor mv;
  
      private String usedByClass = "com.example.MyClass";
  
      @BeforeEach
      void setUp() {
          AnnotationVisitor annotationVisitor = new DefaultAnnotationVisitor(resultCollector, usedByClass);
          SignatureVisitor signatureVisitor = new DefaultSignatureVisitor(resultCollector, usedByClass);
          FieldVisitor fieldVisitor = new DefaultFieldVisitor(annotationVisitor, resultCollector, usedByClass);
          mv = new DefaultMethodVisitor(annotationVisitor, signatureVisitor, resultCollector, usedByClass);
          visitor = new DefaultClassVisitor(
                  signatureVisitor, annotationVisitor, fieldVisitor, mv, resultCollector, usedByClass);
      }
  
      @Test
      void testVisitWithDefaultSuperclass() {
          // class a.b.c
          visitor.visit(50, 0, "a/b/c", null, "java/lang/Object", null);
  
          assertThat(resultCollector.getDependencies()).containsOnly("java.lang.Object");
      }
  
      @Test
      void testVisitWithSuperclass() {
          // class a.b.c
          visitor.visit(50, 0, "a/b/c", null, "x/y/z", null);
  
          assertThat(resultCollector.getDependencies()).containsOnly("x.y.z");
      }
  
      @Test
      void testVisitWithInterface() {
          // class a.b.c implements x.y.z
          visitor.visit(50, 0, "a/b/c", null, "java/lang/Object", new String[] {"x/y/z"});
  
          assertThat(resultCollector.getDependencies()).containsOnly("java.lang.Object", "x.y.z");
      }
  
      @Test
      void testVisitWithInterfaces() {
          // class a.b.c implements p.q.r, x.y.z
          visitor.visit(50, 0, "a/b/c", null, "java/lang/Object", new String[] {"p/q/r", "x/y/z"});
  
          assertThat(resultCollector.getDependencies()).containsOnly("java.lang.Object", "p.q.r", "x.y.z");
      }
  
      @Test
      void testVisitWithUnboundedClassTypeParameter() {
          // class a.b.c<T>
          String signature = "<T:Ljava/lang/Object;>Ljava/lang/Object;";
  
          visitor.visit(50, 0, "a/b/c", signature, "java/lang/Object", null);
  
          assertThat(resultCollector.getDependencies()).containsOnly("java.lang.Object");
      }
  
      @Test
      void testVisitWithBoundedClassTypeParameter() {
         // class a.b.c<T extends x.y.z>
         String signature = "<T:Lx/y/z;>Ljava/lang/Object;";
 
         visitor.visit(50, 0, "a/b/c", signature, "java/lang/Object", null);
 
         assertThat(resultCollector.getDependencies()).containsOnly("java.lang.Object", "x.y.z");
     }
 
     @Test
     void testVisitWithBoundedClassTypeParameters() {
         // class a.b.c<K extends p.q.r, V extends x.y.z>
         String signature = "<K:Lp/q/r;V:Lx/y/z;>Ljava/lang/Object;";
 
         visitor.visit(50, 0, "a/b/c", signature, "java/lang/Object", null);
 
         assertThat(resultCollector.getDependencies()).containsOnly("java.lang.Object", "p.q.r", "x.y.z");
     }
 
     @Test
     void testVisitWithGenericInterface() {
         // class a.b.c implements p.q.r<x.y.z>
         String signature = "Ljava/lang/Object;Lp/q/r<Lx/y/z;>;";
 
         visitor.visit(50, 0, "a/b/c", signature, "java/lang/Object", new String[] {"p.q.r"});
 
         assertThat(resultCollector.getDependencies()).containsOnly("java.lang.Object", "p.q.r", "x.y.z");
     }
 
     @Test
     void testVisitWithInterfaceBound() {
         // class a.b.c<T> implements x.y.z<T>
         String signature = "<T:Ljava/lang/Object;>Ljava/lang/Object;Lx/y/z<TT;>;";
 
         visitor.visit(50, 0, "a/b/c", signature, "java/lang/Object", new String[] {"x.y.z"});
 
         assertThat(resultCollector.getDependencies()).containsOnly("java.lang.Object", "x.y.z");
     }
 
     // visitSource tests ------------------------------------------------------
 
     @Test
     void testVisitSource() {
         visitor.visitSource(null, null);
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitOuterClass tests --------------------------------------------------
 
     @Test
     void testVisitOuterClass() {
         // class a.b.c
         // {
         //     class ...
         //     {
         //     }
         // }
         visitor.visitOuterClass("a/b/c", null, null);
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     @Test
     void testVisitOuterClassInMethod() {
         // class a.b.c
         // {
         //     x.y.z x(p.q.r p)
         //     {
         //         class ...
         //         {
         //         }
         //     }
         // }
         visitor.visitOuterClass("a/b/c", "x", "(Lp/q/r;)Lx/y/z;");
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitAnnotation tests --------------------------------------------------
 
     @Test
     void testVisitAnnotation() {
         assertVisitor(visitor.visitAnnotation("La/b/c;", false));
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitAnnotationWithRuntimeVisibility() {
         assertVisitor(visitor.visitAnnotation("La/b/c;", true));
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     // visitAttribute tests ---------------------------------------------------
 
     @Test
     void testVisitAttribute() {
         visitor.visitAttribute(new MockAttribute("a"));
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitInnerClass tests --------------------------------------------------
 
     @Test
     void testVisitInnerClass() {
         // TODO: ensure innerName is correct
 
         // class a.b.c { class x.y.z { } }
         visitor.visitInnerClass("x/y/z", "a/b/c", "z", 0);
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     @Test
     void testVisitInnerClassAnonymous() {
         // class a.b.c { new class x.y.z { } }
         visitor.visitInnerClass("x/y/z$1", "a/b/c", null, 0);
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitField tests -------------------------------------------------------
 
     @Test
     void testVisitField() {
         // a.b.c a
         assertVisitor(visitor.visitField(0, "a", "La/b/c;", null, null));
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     // TODO: determine actual use of default values
     // void testVisitFieldWithValue()
     // {
     // }
 
     @Test
     void testVisitFieldArray() {
         // a.b.c[] a
         assertVisitor(visitor.visitField(0, "a", "[La/b/c;", null, null));
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitFieldGeneric() {
         // a.b.c<x.y.z> a
         assertVisitor(visitor.visitField(0, "a", "La/b/c;", "La/b/c<Lx/y/z;>;", null));
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c", "x.y.z");
     }
 
     // visitMethod tests ------------------------------------------------------
 
     @Test
     void testVisitMethod() {
         // void a()
         assertVisitor(visitor.visitMethod(0, "a", "()V", null, null));
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     @Test
     void testVisitMethodWithPrimitiveArgument() {
         // void a(int)
         assertVisitor(visitor.visitMethod(0, "a", "(I)V", null, null));
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     @Test
     void testVisitMethodWithPrimitiveArrayArgument() {
         // void a(int[])
         assertVisitor(visitor.visitMethod(0, "a", "([I)V", null, null));
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     @Test
     void testVisitMethodWithObjectArgument() {
         // void a(a.b.c)
         assertVisitor(visitor.visitMethod(0, "a", "(La/b/c;)V", null, null));
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitMethodWithObjectArguments() {
         // void a(a.b.c, x.y.z)
         assertVisitor(visitor.visitMethod(0, "a", "(La/b/c;Lx/y/z;)V", null, null));
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c", "x.y.z");
     }
 
     @Test
     void testVisitMethodWithObjectArrayArgument() {
         // void a(a.b.c[])
         assertVisitor(visitor.visitMethod(0, "a", "([La/b/c;)V", null, null));
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitMethodWithGenericArgument() {
         // void a(a.b.c<x.y.z>)
         assertVisitor(visitor.visitMethod(0, "a", "(La/b/c;)V", "(La/b/c<Lx/y/z;>;)V", null));
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c", "x.y.z");
     }
 
     @Test
     void testVisitMethodWithPrimitiveReturnType() {
         // int a()
         assertVisitor(visitor.visitMethod(0, "a", "()I", null, null));
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     @Test
     void testVisitMethodWithPrimitiveArrayReturnType() {
         // int[] a()
         assertVisitor(visitor.visitMethod(0, "a", "()[I", null, null));
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     @Test
     void testVisitMethodWithObjectReturnType() {
         // a.b.c a()
         assertVisitor(visitor.visitMethod(0, "a", "()La/b/c;", null, null));
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitMethodWithObjectArrayReturnType() {
         // a.b.c[] a()
         assertVisitor(visitor.visitMethod(0, "a", "()[La/b/c;", null, null));
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitMethodWithException() {
         // void a() throws a.b.c
         assertVisitor(visitor.visitMethod(0, "a", "()V", null, new String[] {"a/b/c"}));
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitMethodWithExceptions() {
         // void a() throws a.b.c, x.y.z
         assertVisitor(visitor.visitMethod(0, "a", "()V", null, new String[] {"a/b/c", "x/y/z"}));
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c", "x.y.z");
     }
 
     // visitAnnotationDefault tests -------------------------------------------
 
     @Test
     void testVisitAnnotationDefault() {
         assertVisitor(mv.visitAnnotationDefault());
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitParameterAnnotation tests -------------------------------------------
 
     @Test
     void testVisitParameterAnnotation() {
         // @a.b.c
         assertVisitor(mv.visitParameterAnnotation(0, "La/b/c;", false));
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     // visitCode tests --------------------------------------------------------
 
     @Test
     void testVisitCode() {
         mv.visitCode();
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitFrame tests -------------------------------------------------------
 
     @Test
     void testVisitFrame() {
         mv.visitFrame(Opcodes.F_NEW, 0, new Object[0], 0, new Object[0]);
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitInsn tests --------------------------------------------------------
 
     @Test
     void testVisitInsn() {
         mv.visitInsn(Opcodes.NOP);
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitIntInsn tests -----------------------------------------------------
 
     @Test
     void testVisitIntInsn() {
         mv.visitIntInsn(Opcodes.BIPUSH, 0);
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitVarInsn tests -----------------------------------------------------
 
     @Test
     void testVisitVarInsn() {
         mv.visitVarInsn(Opcodes.ILOAD, 0);
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitTypeInsn tests ----------------------------------------------------
 
     @Test
     void testVisitTypeInsn() {
         mv.visitTypeInsn(Opcodes.NEW, "a/b/c");
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     // visitFieldInsn tests ---------------------------------------------------
 
     @Test
     void testVisitFieldInsnWithPrimitive() {
         mv.visitFieldInsn(Opcodes.GETFIELD, "a/b/c", "x", "I");
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitFieldInsnWithObject() {
         mv.visitFieldInsn(Opcodes.GETFIELD, "a/b/c", "x", "Lx/y/z;");
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     // visitMethodInsn tests --------------------------------------------------
 
     @Test
     void testVisitMethodInsn() {
         mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "a/b/c", "x", "()V", false);
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitMethodInsnWithPrimitiveArgument() {
         mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "a/b/c", "x", "(I)V", false);
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitMethodInsnWithPrimitiveArrayArgument() {
         mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "a/b/c", "x", "([I)V", false);
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitMethodInsnWithObjectArgument() {
         mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "a/b/c", "x", "(Lx/y/z;)V", false);
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitMethodInsnWithObjectArguments() {
         mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "a/b/c", "x", "(Lp/q/r;Lx/y/z;)V", false);
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitMethodInsnWithObjectArrayArgument() {
         mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "a/b/c", "x", "([Lx/y/z;)V", false);
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitMethodInsnWithPrimitiveReturnType() {
         mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "a/b/c", "x", "()I", false);
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitMethodInsnWithPrimitiveArrayReturnType() {
         mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "a/b/c", "x", "()[I", false);
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitMethodInsnWithObjectReturnType() {
         mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "a/b/c", "x", "()Lx/y/z;", false);
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitMethodInsnWithObjectArrayReturnType() {
         mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "a/b/c", "x", "()[Lx/y/z;", false);
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     // visitJumpInsn tests ----------------------------------------------------
 
     @Test
     void testVisitJumpInsn() {
         mv.visitJumpInsn(Opcodes.IFEQ, new Label());
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitLabel tests -------------------------------------------------------
 
     @Test
     void testVisitLabel() {
         mv.visitLabel(new Label());
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitLdcInsn tests -----------------------------------------------------
 
     @Test
     void testVisitLdcInsnWithNonType() {
         mv.visitLdcInsn("a");
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     @Test
     void testVisitLdcInsnWithPrimitiveType() {
         mv.visitLdcInsn(Type.INT_TYPE);
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     @Test
     void testVisitLdcInsnWithObjectType() {
         mv.visitLdcInsn(Type.getType("La/b/c;"));
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     // visitIincInsn tests ----------------------------------------------------
 
     @Test
     void testVisitIincInsn() {
         mv.visitIincInsn(0, 1);
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitTableSwitchInsn tests ---------------------------------------------
 
     @Test
     void testVisitTableSwitchInsn() {
         mv.visitTableSwitchInsn(0, 1, new Label(), new Label());
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitLookupSwitchInsn tests --------------------------------------------
 
     @Test
     void testVisitLookupSwitchInsn() {
         mv.visitLookupSwitchInsn(new Label(), new int[] {0}, new Label[] {new Label()});
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitMultiANewArrayInsn tests ------------------------------------------
 
     @Test
     void testVisitMultiANewArrayInsnWithPrimitive() {
         mv.visitMultiANewArrayInsn("I", 2);
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     @Test
     void testVisitMultiANewArrayInsnWithObject() {
         mv.visitMultiANewArrayInsn("La/b/c;", 2);
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     // visitTryCatchBlock tests -----------------------------------------------
 
     @Test
     void testVisitTryCatchBlock() {
         mv.visitTryCatchBlock(new Label(), new Label(), new Label(), "a/b/c");
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitTryCatchBlockForFinally() {
         mv.visitTryCatchBlock(new Label(), new Label(), new Label(), null);
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitLocalVariable tests -----------------------------------------------
 
     @Test
     void testVisitLocalVariableWithPrimitive() {
         mv.visitLocalVariable("a", "I", null, new Label(), new Label(), 0);
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     @Test
     void testVisitLocalVariableWithPrimitiveArray() {
         mv.visitLocalVariable("a", "[I", null, new Label(), new Label(), 0);
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     @Test
     void testVisitLocalVariableWithObject() {
         mv.visitLocalVariable("a", "La/b/c;", null, new Label(), new Label(), 0);
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitLocalVariableWithObjectArray() {
         mv.visitLocalVariable("a", "[La/b/c;", null, new Label(), new Label(), 0);
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c");
     }
 
     @Test
     void testVisitLocalVariableWithGenericObject() {
         mv.visitLocalVariable("a", "La/b/c;", "La/b/c<Lx/y/z;>;", new Label(), new Label(), 0);
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c", "x.y.z");
     }
 
     @Test
     void testVisitLocalVariableWithGenericObjectArray() {
         mv.visitLocalVariable("a", "La/b/c;", "[La/b/c<Lx/y/z;>;", new Label(), new Label(), 0);
 
         assertThat(resultCollector.getDependencies()).containsOnly("a.b.c", "x.y.z");
     }
 
     // visitLineNumber tests --------------------------------------------------
 
     @Test
     void testVisitLineNumber() {
         mv.visitLineNumber(0, new Label());
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitMaxs tests --------------------------------------------------------
 
     @Test
     void testVisitMaxs() {
         mv.visitMaxs(0, 0);
 
         assertThat(resultCollector.getDependencies()).isEmpty();
     }
 
     // visitInvokeDynamicInsn tests -------------------------------------------
     @Test
     void testVisitInvokeDynamic() {
         Type type = Type.getType("(La/b/C;)V");
         mv.visitInvokeDynamicInsn("a", "", null, type);
         assertThat(resultCollector.getDependencies()).contains("a.b.C");
     }
 
     private void assertVisitor(Object actualVisitor) {
         // assertEquals( visitor, actualVisitor );
     }
 
     /**
      * A simple ASM <code>Attribute</code> for use in tests.
      *
      * @author <a href="mailto:markhobson@gmail.com">Mark Hobson</a>
      */
     static class MockAttribute extends Attribute {
         MockAttribute(String type) {
             super(type);
         }
     }
 }