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/*
 * Copyright (c) 2006-2013 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.mockups;

import java.lang.reflect.*;
import java.util.*;

import mockit.internal.state.*;
import mockit.internal.util.*;
import mockit.internal.util.GenericTypeReflection.*;

/**
 * A container for the mock methods "collected" from a mock class, separated in two sets: one with all the mock methods,
 * and another with just the subset of static methods.
 */
final class MockMethods
{
   final Class realClass;
   private final List methods;
   private final GenericTypeReflection typeParametersToTypeArguments;
   private String mockClassInternalName;
   private List mockStates;

   final class MockMethod
   {
      final String name;
      final String desc;
      final boolean isStatic;
      final boolean hasInvocationParameter;
      String mockedMethodDesc;
      private final String mockDescWithoutInvocationParameter;
      private GenericSignature mockSignature;
      private int indexForMockState;
      private boolean nativeRealMethod;

      private MockMethod(String nameAndDesc, boolean isStatic)
      {
         int p = nameAndDesc.indexOf('(');
         name = nameAndDesc.substring(0, p);
         desc = nameAndDesc.substring(p);
         this.isStatic = isStatic;
         hasInvocationParameter = desc.startsWith("(Lmockit/Invocation;");
         mockDescWithoutInvocationParameter = hasInvocationParameter ? '(' + desc.substring(20) : desc;
         indexForMockState = -1;
      }

      boolean isMatch(String name, String desc, String signature)
      {
         if (this.name.equals(name)) {
            if (hasMatchingParameters(desc, signature)) {
               mockedMethodDesc = desc;
               return true;
            }
         }

         return false;
      }

      private boolean hasMatchingParameters(String desc, String signature)
      {
         boolean sameParametersIgnoringGenerics = mockDescWithoutInvocationParameter.equals(desc);

         if (sameParametersIgnoringGenerics || signature == null) {
            return sameParametersIgnoringGenerics;
         }

         if (mockSignature == null) {
            mockSignature = typeParametersToTypeArguments.parseSignature(mockDescWithoutInvocationParameter);
         }

         return mockSignature.satisfiesGenericSignature(signature);
      }

      Class getRealClass() { return realClass; }
      String getMockNameAndDesc() { return name + desc; }
      int getIndexForMockState() { return indexForMockState; }

      boolean isForGenericMethod() { return mockSignature != null; }
      boolean isForConstructor() { return "$init".equals(name); }

      boolean isForNativeMethod() { return nativeRealMethod; }
      void markAsNativeRealMethod() { nativeRealMethod = true; }

      boolean canBeReentered()
      {
         return hasInvocationParameter && !nativeRealMethod && !isForConstructor();
      }

      boolean isReentrant() { return indexForMockState >= 0 && mockStates.get(indexForMockState).isReentrant(); }

      boolean isDynamic() { return isReentrant() || hasInvocationParameter && isForConstructor(); }

      boolean hasMatchingRealMethod() { return mockedMethodDesc != null; }

      String errorMessage(String quantifier, int numExpectedInvocations, int timesInvoked)
      {
         String nameAndDesc = getMockNameAndDesc();
         return
            "Expected " + quantifier + ' ' + numExpectedInvocations + " invocation(s) of " +
            new MethodFormatter(mockClassInternalName, nameAndDesc) + ", but was invoked " + timesInvoked + " time(s)";
      }

      @Override
      public boolean equals(Object obj)
      {
         MockMethod other = (MockMethod) obj;
         return realClass == other.getRealClass() && name.equals(other.name) && desc.equals(other.desc);
      }

      @Override
      public int hashCode()
      {
         return 31 * (31 * realClass.hashCode() + name.hashCode()) + desc.hashCode();
      }
   }

   MockMethods(Class realClass, ParameterizedType mockedType)
   {
      this.realClass = realClass;
      methods = new ArrayList();
      typeParametersToTypeArguments = new GenericTypeReflection(realClass, mockedType);
   }

   MockMethod addMethod(boolean fromSuperClass, String name, String desc, boolean isStatic)
   {
      if (fromSuperClass && isMethodAlreadyAdded(name, desc)) {
         return null;
      }

      String nameAndDesc = name + desc;
      MockMethod mockMethod = new MockMethod(nameAndDesc, isStatic);
      methods.add(mockMethod);
      return mockMethod;
   }

   private boolean isMethodAlreadyAdded(String name, String desc)
   {
      int p = desc.lastIndexOf(')');
      String params = desc.substring(0, p + 1);

      for (MockMethod mockMethod : methods) {
         if (mockMethod.name.equals(name) && mockMethod.desc.startsWith(params)) {
            return true;
         }
      }

      return false;
   }

   void addMockState(MockState mockState)
   {
      if (mockStates == null) {
         mockStates = new ArrayList(4);
      }

      mockState.mockMethod.indexForMockState = mockStates.size();
      mockStates.add(mockState);
   }

   /**
    * Verifies if a mock method with the same signature of a given real method was previously collected from the mock
    * class.
    * This operation can be performed only once for any given mock method in this container, so that after the last real
    * method is processed there should be no mock methods left unused in the container.
    */
   MockMethod containsMethod(String name, String desc, String signature)
   {
      for (MockMethod mockMethod : methods) {
         if (mockMethod.isMatch(name, desc, signature)) {
            return mockMethod;
         }
      }

      return null;
   }

   String getMockClassInternalName() { return mockClassInternalName; }
   void setMockClassInternalName(String mockClassInternalName) { this.mockClassInternalName = mockClassInternalName; }

   boolean hasUnusedMocks()
   {
      for (MockMethod method : methods) {
         if (!method.hasMatchingRealMethod()) {
            return true;
         }
      }

      return false;
   }

   List getUnusedMockSignatures()
   {
      List signatures = new ArrayList(methods.size());

      for (MockMethod mockMethod : methods) {
         if (!"$clinit()V".equals(mockMethod.getMockNameAndDesc()) && !mockMethod.hasMatchingRealMethod()) {
            signatures.add(mockMethod.getMockNameAndDesc());
         }
      }

      return signatures;
   }

   void registerMockStates(boolean forStartupMock)
   {
      if (mockStates != null) {
         MockStates mockStates = TestRun.getMockClasses().getMockStates();

         if (!forStartupMock) {
            mockStates.addMockStates(this.mockStates);
         }

         mockStates.addMockClassAndItsStates(mockClassInternalName, this.mockStates);
      }
   }
}