/*
    * Copyright (c) 2006 JMockit developers
    * This file is subject to the terms of the MIT license (see LICENSE.txt).
    */
   package mockit.internal.expectations;
   
   import edu.umd.cs.findbugs.annotations.NonNull;
   import edu.umd.cs.findbugs.annotations.Nullable;
   
  import java.util.ArrayList;
  import java.util.List;
  
  import mockit.internal.expectations.invocation.ExpectedInvocation;
  import mockit.internal.expectations.invocation.InvocationArguments;
  import mockit.internal.state.TestRun;
  import mockit.internal.util.GeneratedClasses;
  
  final class PhasedExecutionState {
      @NonNull
      final List<Expectation> expectations;
      @NonNull
      final List<VerifiedExpectation> verifiedExpectations;
      @NonNull
      final EquivalentInstances equivalentInstances;
      @NonNull
      final InstanceBasedMatching instanceBasedMatching;
      @Nullable
      PartiallyMockedInstances partiallyMockedInstances;
  
      PhasedExecutionState() {
          expectations = new ArrayList<>();
          verifiedExpectations = new ArrayList<>();
          equivalentInstances = new EquivalentInstances();
          instanceBasedMatching = new InstanceBasedMatching();
      }
  
      void addExpectation(@NonNull Expectation expectation) {
          ExpectedInvocation invocation = expectation.invocation;
          forceMatchingOnMockInstanceIfRequired(invocation);
          removeMatchingExpectationsCreatedBefore(invocation);
          expectations.add(expectation);
      }
  
      private void forceMatchingOnMockInstanceIfRequired(@NonNull ExpectedInvocation invocation) {
          if (!invocation.matchInstance
                  && isToBeMatchedOnInstance(invocation.instance, invocation.getMethodNameAndDescription())) {
              invocation.matchInstance = true;
          }
      }
  
      boolean isToBeMatchedOnInstance(@Nullable Object mock, @NonNull String mockNameAndDesc) {
          if (mock == null || mockNameAndDesc.charAt(0) == '<') {
              return false;
          }
  
          if (instanceBasedMatching.isToBeMatchedOnInstance(mock)
                  || partiallyMockedInstances != null && partiallyMockedInstances.isToBeMatchedOnInstance(mock)) {
              return true;
          }
  
          return TestRun.getExecutingTest().isInjectableMock(mock);
      }
  
      private void removeMatchingExpectationsCreatedBefore(@NonNull ExpectedInvocation invocation) {
          Expectation previousExpectation = findPreviousExpectation(invocation);
  
          if (previousExpectation != null) {
              expectations.remove(previousExpectation);
              invocation.copyDefaultReturnValue(previousExpectation.invocation);
          }
      }
  
      @Nullable
      private Expectation findPreviousExpectation(@NonNull ExpectedInvocation newInvocation) {
          int n = expectations.size();
  
          if (n == 0) {
              return null;
          }
  
          Object mock = newInvocation.instance;
          @NonNull
          Boolean matchInstance = newInvocation.matchInstance;
          String mockClassDesc = newInvocation.getClassDesc();
          String mockNameAndDesc = newInvocation.getMethodNameAndDescription();
          boolean isConstructor = newInvocation.isConstructor();
  
          for (Expectation previous : expectations) {
              if (isMatchingInvocation(mock, matchInstance, mockClassDesc, mockNameAndDesc, isConstructor, previous)
                      && isWithMatchingArguments(newInvocation, previous.invocation)) {
                  return previous;
              }
          }
  
          return null;
      }
  
      private boolean isMatchingInvocation(@Nullable Object mock, @Nullable Boolean matchInstance,
              @NonNull String mockClassDesc, @NonNull String mockNameAndDesc, boolean constructorInvocation,
             @NonNull Expectation expectation) {
         ExpectedInvocation invocation = expectation.invocation;
 
         return invocation.isMatch(mock, mockClassDesc, mockNameAndDesc) && isSameMockedClass(mock, invocation.instance)
                 && (constructorInvocation || mock == null || isMatchingInstance(mock, matchInstance, expectation));
     }
 
     private static boolean isSameMockedClass(@Nullable Object mock1, @Nullable Object mock2) {
         if (mock1 == mock2) {
             return true;
         }
 
         if (mock1 != null && mock2 != null) {
             Class<?> mockedClass1 = mock1.getClass();
             Class<?> mockedClass2 = GeneratedClasses.getMockedClass(mock2);
             return mockedClass2.isAssignableFrom(mockedClass1)
                     || TestRun.mockFixture().areCapturedClasses(mockedClass1, mockedClass2);
         }
 
         return false;
     }
 
     private boolean isWithMatchingArguments(@NonNull ExpectedInvocation newInvocation,
             @NonNull ExpectedInvocation previousInvocation) {
         InvocationArguments newArguments = newInvocation.arguments;
         InvocationArguments previousArguments = previousInvocation.arguments;
 
         if (newArguments.getMatchers() == null) {
             return previousArguments.isMatch(newArguments.getValues(), equivalentInstances.instanceMap);
         }
 
         return newArguments.hasEquivalentMatchers(previousArguments);
     }
 
     @Nullable
     Expectation findExpectation(@Nullable Object mock, @NonNull String mockClassDesc, @NonNull String mockNameAndDesc,
             @NonNull Object[] args) {
         boolean isConstructor = mockNameAndDesc.charAt(0) == '<';
         Expectation replayExpectationFound = null;
 
         // Note: new expectations might get added to the list, so a regular loop would cause a CME:
         // noinspection ForLoopReplaceableByForEach
         for (Expectation expectation : expectations) {
             if (replayExpectationFound != null && expectation.recordPhase == null) {
                 continue;
             }
 
             if (isMatchingInvocation(mock, null, mockClassDesc, mockNameAndDesc, isConstructor, expectation)
                     && expectation.invocation.arguments.isMatch(args, equivalentInstances.instanceMap)) {
                 if (expectation.recordPhase == null) {
                     replayExpectationFound = expectation;
                     continue;
                 }
 
                 if (isConstructor) {
                     equivalentInstances.registerReplacementInstanceIfApplicable(mock, expectation.invocation);
                 }
 
                 return expectation;
             }
         }
 
         return replayExpectationFound;
     }
 
     private boolean isMatchingInstance(@NonNull Object invokedInstance, @Nullable Boolean matchInstance,
             @NonNull Expectation expectation) {
         ExpectedInvocation invocation = expectation.invocation;
         Object invocationInstance = invocation.instance;
         assert invocationInstance != null;
 
         if (equivalentInstances.isEquivalentInstance(invocationInstance, invokedInstance)) {
             return true;
         }
 
         if (TestRun.getExecutingTest().isInjectableMock(invokedInstance)
                 || partiallyMockedInstances != null
                         && partiallyMockedInstances.isDynamicMockInstanceOrClass(invokedInstance, invocationInstance)
                 || equivalentInstances.areNonEquivalentInstances(invocationInstance, invokedInstance)) {
             return false;
         }
 
         return (matchInstance == null || !matchInstance) && !invocation.matchInstance && expectation.recordPhase != null
                 && !equivalentInstances.replacementMap.containsValue(invocationInstance);
     }
 }