/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkJavaUtil.cxx

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/

#ifdef _INTEGRAL_MAX_BITS
#undef _INTEGRAL_MAX_BITS
#endif
#define _INTEGRAL_MAX_BITS 64

#include "vtkObject.h"
#include "vtkDebugLeaks.h"
#include "vtkWindows.h"

#include "vtkJavaUtil.h"

// Silent warning like
// "dereferencing type-punned pointer will break strict-aliasing rules"
// it happens because this kind of expression: (void **)(&e)
// pragma GCC diagnostic is available since gcc>=4.2
#if defined(__GNUG__) && (__GNUC__>4) || (__GNUC__==4 && __GNUC_MINOR__>=2)
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
#endif


JNIEXPORT jlong vtkJavaGetId(JNIEnv *env,jobject obj)
{
  jfieldID id;
  jlong result;
    
  id = env->GetFieldID(env->GetObjectClass(obj),"vtkId","J");
  
  result = env->GetLongField(obj,id);
  return result;
}

JNIEXPORT void *vtkJavaGetPointerFromObject(JNIEnv *env, jobject obj)
{
  return (void*)(size_t)vtkJavaGetId(env, obj);
}

JNIEXPORT jarray vtkJavaMakeJArrayOfDoubleFromDouble(JNIEnv *env, double *ptr, int size)
{
  jdoubleArray ret;
  int i;
  jdouble *array;

  ret = env->NewDoubleArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetDoubleArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = ptr[i];
    }
  
  env->ReleaseDoubleArrayElements(ret,array,0);
  return ret;
}

JNIEXPORT jarray vtkJavaMakeJArrayOfDoubleFromFloat(JNIEnv *env, float *ptr, int size)
{
  jdoubleArray ret;
  int i;
  jdouble *array;

  ret = env->NewDoubleArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetDoubleArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = ptr[i];
    }
  
  env->ReleaseDoubleArrayElements(ret,array,0);
  return ret;
}

JNIEXPORT jarray vtkJavaMakeJArrayOfIntFromInt(JNIEnv *env, int *ptr, int size)
{
  jintArray ret;
  int i;
  jint *array;

  ret = env->NewIntArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetIntArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = ptr[i];
    }
  
  env->ReleaseIntArrayElements(ret,array,0);
  return ret;
}

JNIEXPORT jarray vtkJavaMakeJArrayOfIntFromIdType(JNIEnv *env, vtkIdType *ptr, int size)
{
  jintArray ret;
  int i;
  jint *array;

  ret = env->NewIntArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetIntArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = (int)ptr[i];
    }
  
  env->ReleaseIntArrayElements(ret,array,0);
  return ret;
}

#if defined(VTK_TYPE_USE_LONG_LONG)
JNIEXPORT jarray vtkJavaMakeJArrayOfIntFromLongLong(JNIEnv *env, long long *ptr, int size)
{
  jintArray ret;
  int i;
  jint *array;

  ret = env->NewIntArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetIntArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = (int)ptr[i];
    }

  env->ReleaseIntArrayElements(ret,array,0);
  return ret;
}
#endif

#if defined(VTK_TYPE_USE___INT64)
JNIEXPORT jarray vtkJavaMakeJArrayOfIntFrom__Int64(JNIEnv *env, __int64 *ptr, int size)
{
  jintArray ret;
  int i;
  jint *array;

  ret = env->NewIntArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetIntArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = (int)ptr[i];
    }

  env->ReleaseIntArrayElements(ret,array,0);
  return ret;
}
#endif

JNIEXPORT jarray vtkJavaMakeJArrayOfIntFromSignedChar(JNIEnv *env, signed char *ptr, int size)
{
  jintArray ret;
  int i;
  jint *array;

  ret = env->NewIntArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetIntArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = (int)ptr[i];
    }

  env->ReleaseIntArrayElements(ret,array,0);
  return ret;
}

JNIEXPORT jarray vtkJavaMakeJArrayOfFloatFromFloat(JNIEnv *env, float *ptr, int size)
{
  jfloatArray ret;
  int i;
  jfloat *array;

  ret = env->NewFloatArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetFloatArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = ptr[i];
    }
  
  env->ReleaseFloatArrayElements(ret,array,0);
  return ret;
}

JNIEXPORT jarray vtkJavaMakeJArrayOfShortFromShort(JNIEnv *env, short *ptr, int size)
{
  jshortArray ret;
  int i;
  jshort *array;

  ret = env->NewShortArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetShortArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = ptr[i];
    }
  
  env->ReleaseShortArrayElements(ret,array,0);
  return ret;
}

JNIEXPORT jarray vtkJavaMakeJArrayOfByteFromUnsignedChar(JNIEnv *env, unsigned char *ptr, int size)
{
  jbyteArray ret;
  int i;
  jbyte *array;

  ret = env->NewByteArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetByteArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = ptr[i];
    }
  
  env->ReleaseByteArrayElements(ret,array,0);
  return ret;
}

JNIEXPORT jarray vtkJavaMakeJArrayOfLongFromLong(JNIEnv *env, long *ptr, int size)
{
  cout.flush();
  jlongArray ret;
  int i;
  jlong *array;

  ret = env->NewLongArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetLongArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = ptr[i];
    }
  
  env->ReleaseLongArrayElements(ret,array,0);
  return ret;
}

JNIEXPORT jarray vtkJavaMakeJArrayOfUnsignedLongFromUnsignedLong(JNIEnv *env,unsigned long *ptr,int size)
{
  cout.flush();
  jlongArray ret;
  int i;
  jlong *array;

  ret = env->NewLongArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetLongArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = ptr[i];
    }
  
  env->ReleaseLongArrayElements(ret,array,0);
  return ret;
}

JNIEXPORT jarray vtkJavaMakeJArrayOfUnsignedShortFromUnsignedShort(JNIEnv *env,unsigned short *ptr,int size)
{
  cout.flush();
  jshortArray ret;
  int i;
  jshort *array;

  ret = env->NewShortArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetShortArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = ptr[i];
    }
  
  env->ReleaseShortArrayElements(ret,array,0);
  return ret;
}

JNIEXPORT jarray vtkJavaMakeJArrayOfUnsignedCharFromUnsignedChar(JNIEnv *env,unsigned char *ptr,int size)
{
  cout.flush();
  jbyteArray ret;
  int i;
  jbyte *array;

  ret = env->NewByteArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetByteArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = ptr[i];
    }
  
  env->ReleaseByteArrayElements(ret,array,0);
  return ret;
}

JNIEXPORT jarray vtkJavaMakeJArrayOfUnsignedIntFromUnsignedInt(JNIEnv *env,unsigned int *ptr,int size)
{
  cout.flush();
  jintArray ret;
  int i;
  jint *array;

  ret = env->NewIntArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetIntArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = ptr[i];
    }
  
  env->ReleaseIntArrayElements(ret,array,0);
  return ret;
}

JNIEXPORT jarray vtkJavaMakeJArrayOfCharFromChar(JNIEnv *env, char *ptr, int size)
{
  cout.flush();
  jcharArray ret;
  int i;
  jchar *array;

  ret = env->NewCharArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetCharArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = ptr[i];
    }
  
  env->ReleaseCharArrayElements(ret,array,0);
  return ret;
}

JNIEXPORT jarray vtkJavaMakeJArrayOfIntFromBool(JNIEnv *env, bool *ptr,int size)
{
  cout.flush();
  jintArray ret;
  int i;
  jint *array;

  ret = env->NewIntArray(size);
  if (ret == 0)
    {
    // should throw an exception here
    return 0;
    }

  array = env->GetIntArrayElements(ret,NULL);

  // copy the data
  for (i = 0; i < size; i++)
    {
    array[i] = ptr[i];
    }
  
  env->ReleaseIntArrayElements(ret,array,0);
  return ret;
}

JNIEXPORT char *vtkJavaUTFToChar(JNIEnv *env, jstring in)
{
  char *result;
  const char *inBytes;
  int length, i;
  int resultLength = 1;
  
  if( in == NULL )
    {
    return NULL; 
    }

  length = env->GetStringUTFLength(in);
  inBytes = env->GetStringUTFChars(in,NULL);
  
  for (i = 0; i < length; i++)
    {
    if ((inBytes[i] & 0x80) == 0) resultLength++;
    }
  result = new char [resultLength];

  resultLength = 0; // the 0 versus 1 up above is on purpose
  for (i = 0; i < length; i++)
    {
    if ((inBytes[i] & 0x80) == 0)
      {
      result[resultLength] = inBytes[i];
      resultLength++;
      }
    }
  result[resultLength] = '\0';
  env->ReleaseStringUTFChars(in,inBytes);
  return result;
}

JNIEXPORT jstring vtkJavaMakeJavaString(JNIEnv *env, const char *in)
{
  if (!in) {
    return env->NewStringUTF("");
  } else {
    return env->NewStringUTF(in);
  }
}

//**jcp this is the callback inteface stub for Java. no user parms are passed
//since the callback must be a method of a class. We make the rash assumption
//that the <this> pointer will anchor any required other elements for the
//called functions. - edited by km
JNIEXPORT void vtkJavaVoidFunc(void* f) 
{  
  vtkJavaVoidFuncArg *iprm = (vtkJavaVoidFuncArg *)f;
  // make sure we have a valid method ID
  if (iprm->mid)
    {
    JNIEnv *e;
    // it should already be atached
#ifdef JNI_VERSION_1_2
    iprm->vm->AttachCurrentThread((void **)(&e),NULL);
#else
    iprm->vm->AttachCurrentThread((JNIEnv_**)(&e),NULL);
#endif
    e->CallVoidMethod(iprm->uobj,iprm->mid,NULL); 
    }
}

JNIEXPORT void vtkJavaVoidFuncArgDelete(void* arg) 
{
  vtkJavaVoidFuncArg *arg2;
  
  arg2 = (vtkJavaVoidFuncArg *)arg;
  
  JNIEnv *e;
  // it should already be atached
#ifdef JNI_VERSION_1_2
  arg2->vm->AttachCurrentThread((void **)(&e),NULL);
#else
  arg2->vm->AttachCurrentThread((JNIEnv_**)(&e),NULL);
#endif
  // free the structure
  e->DeleteGlobalRef(arg2->uobj);
  delete arg2;
}

vtkJavaCommand::vtkJavaCommand() 
{ 
  this->vm = NULL;
}

vtkJavaCommand::~vtkJavaCommand() 
{ 
  JNIEnv *e;
  // it should already be atached
#ifdef JNI_VERSION_1_2
  this->vm->AttachCurrentThread((void **)(&e),NULL);
#else
  this->vm->AttachCurrentThread((JNIEnv_**)(&e),NULL);
#endif
  // free the structure
  e->DeleteGlobalRef(this->uobj);
}

void vtkJavaCommand::Execute(vtkObject *, unsigned long, void *)
{
  // make sure we have a valid method ID
  if (this->mid)
    {
    JNIEnv *e;
    // it should already be atached
#ifdef JNI_VERSION_1_2
    this->vm->AttachCurrentThread((void **)(&e),NULL);
#else
    this->vm->AttachCurrentThread((JNIEnv_**)(&e),NULL);
#endif
    e->CallVoidMethod(this->uobj,this->mid,NULL); 
    }
}

