/*
    * MIT License
    * Copyright (c) 2006-2025 JMockit developers
    * See LICENSE file for full license text.
    */
   package mockit.internal.expectations.mocking;
   
   import static java.lang.reflect.Modifier.isFinal;
   
  import edu.umd.cs.findbugs.annotations.NonNull;
  
  import java.lang.reflect.Field;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Map.Entry;
  
  import mockit.asm.jvmConstants.Access;
  import mockit.internal.reflection.FieldReflection;
  import mockit.internal.state.TestRun;
  import mockit.internal.util.StackTrace;
  
  @SuppressWarnings("UnnecessaryFullyQualifiedName")
  public final class FieldTypeRedefinitions extends TypeRedefinitions {
      private static final int FIELD_ACCESS_MASK = Access.SYNTHETIC + Access.STATIC;
  
      @NonNull
      private final Map<MockedType, InstanceFactory> mockInstanceFactories;
      @NonNull
      private final List<MockedType> mockFieldsNotSet;
  
      public FieldTypeRedefinitions(@NonNull Class<?> testClass) {
          mockInstanceFactories = new HashMap<>();
          mockFieldsNotSet = new ArrayList<>();
  
          TestRun.enterNoMockingZone();
  
          try {
              redefineFieldTypes(testClass);
          } finally {
              TestRun.exitNoMockingZone();
          }
      }
  
      private void redefineFieldTypes(@NonNull Class<?> classWithMockFields) {
          Class<?> superClass = classWithMockFields.getSuperclass();
  
          if (superClass != null && superClass != Object.class && superClass != mockit.Expectations.class) {
              redefineFieldTypes(superClass);
          }
  
          Field[] fields = classWithMockFields.getDeclaredFields();
  
          for (Field candidateField : fields) {
              int fieldModifiers = candidateField.getModifiers();
  
              if ((fieldModifiers & FIELD_ACCESS_MASK) == 0) {
                  redefineFieldType(candidateField, fieldModifiers);
              }
          }
      }
  
      private void redefineFieldType(@NonNull Field field, int modifiers) {
          MockedType mockedType = new MockedType(field);
  
          if (mockedType.isMockableType()) {
              boolean partialMocking = field.isAnnotationPresent(mockit.Tested.class);
              boolean needsValueToSet = !isFinal(modifiers) && !partialMocking;
  
              redefineFieldType(mockedType, partialMocking, needsValueToSet);
  
              if (!partialMocking) {
                  registerCaptureOfNewInstances(mockedType);
              }
          }
      }
  
      private void redefineFieldType(@NonNull MockedType mockedType, boolean partialMocking, boolean needsValueToSet) {
          FieldTypeRedefinition typeRedefinition = new FieldTypeRedefinition(mockedType);
          boolean redefined;
  
          if (needsValueToSet) {
              InstanceFactory factory = typeRedefinition.redefineType();
              redefined = factory != null;
  
              if (redefined) {
                  mockInstanceFactories.put(mockedType, factory);
              }
          } else {
              if (partialMocking) {
                  redefined = typeRedefinition.redefineTypeForTestedField();
              } else {
                  redefined = typeRedefinition.redefineTypeForFinalField();
              }
  
              if (redefined) {
                  mockFieldsNotSet.add(mockedType);
              }
         }
 
         if (redefined) {
             addTargetClass(mockedType);
         }
     }
 
     private void registerCaptureOfNewInstances(@NonNull MockedType mockedType) {
         if (mockedType.getMaxInstancesToCapture() > 0) {
             if (captureOfNewInstances == null) {
                 captureOfNewInstances = new CaptureOfNewInstancesForFields();
             }
 
             captureOfNewInstances.registerCaptureOfNewInstances(mockedType, null);
         }
     }
 
     public void assignNewInstancesToMockFields(@NonNull Object target) {
         TestRun.getExecutingTest().clearRegularAndInjectableMocks();
         createAndAssignNewInstances(target);
         obtainAndRegisterInstancesOfFieldsNotSet(target);
     }
 
     private void createAndAssignNewInstances(@NonNull Object target) {
         for (Entry<MockedType, InstanceFactory> metadataAndFactory : mockInstanceFactories.entrySet()) {
             MockedType mockedType = metadataAndFactory.getKey();
             InstanceFactory instanceFactory = metadataAndFactory.getValue();
 
             Object mock = assignNewInstanceToMockField(target, mockedType, instanceFactory);
             registerMock(mockedType, mock);
         }
     }
 
     @NonNull
     private Object assignNewInstanceToMockField(@NonNull Object target, @NonNull MockedType mockedType,
             @NonNull InstanceFactory instanceFactory) {
         Field mockField = mockedType.field;
         assert mockField != null;
         Object mock = FieldReflection.getFieldValue(mockField, target);
 
         if (mock == null) {
             try {
                 mock = instanceFactory.create();
             } catch (NoClassDefFoundError | ExceptionInInitializerError e) {
                 StackTrace.filterStackTrace(e);
                 e.printStackTrace();
                 throw e;
             }
 
             FieldReflection.setFieldValue(mockField, target, mock);
 
             if (mockedType.getMaxInstancesToCapture() > 0) {
                 assert captureOfNewInstances != null;
                 CaptureOfNewInstancesForFields capture = (CaptureOfNewInstancesForFields) captureOfNewInstances;
                 capture.resetCaptureCount(mockField);
             }
         }
 
         return mock;
     }
 
     private void obtainAndRegisterInstancesOfFieldsNotSet(@NonNull Object target) {
         for (MockedType metadata : mockFieldsNotSet) {
             assert metadata.field != null;
             Object mock = FieldReflection.getFieldValue(metadata.field, target);
 
             if (mock != null) {
                 registerMock(metadata, mock);
             }
         }
     }
 
     /**
      * Returns true iff the mock instance concrete class is not mocked in some test, i.e. it's a class which only
      * appears in the code under test.
      */
     public boolean captureNewInstanceForApplicableMockField(@NonNull Object mock) {
         if (captureOfNewInstances == null) {
             return false;
         }
 
         Object fieldOwner = TestRun.getCurrentTestInstance();
         return captureOfNewInstances.captureNewInstance(fieldOwner, mock);
     }
 
     @Override
     public void cleanUp() {
         TestRun.getExecutingTest().getCascadingTypes().clear();
         super.cleanUp();
     }
 }