/*
void checkStatus(const char* msg, int status) {
    if (status != CL_SUCCESS) {
        printf("%s; error: %d \n", msg, status);
        exit(EXIT_FAILURE);
    }
}
*/


/*
void createContextCallback(const char * c, const void * v, size_t s, void * o) {
    //TODO
}
*/

/*   Java->C glue code:
 *   Java package: com.mbien.opencl.impl.CLImpl
 *    Java method: long clCreateContextFromType(java.nio.IntBuffer props, long device_type, CreateContextCallback pfn_notify, Object userData, IntBuffer errcode_ret)
 *     C function: cl_context clCreateContextFromType(  cl_context_properties *  properties ,
 *                                                      cl_uint                  num_devices ,
 *                                                      const cl_device_id *     devices ,
 *                                                      void (*pfn_notify)(const char *, const void *, size_t, void *)  pfn_notify/,
 *                                                      void *                   user_data ,
 *                                                      cl_int *                 errcode_ret );
 */
//__Ljava_lang_Object_2IJLjava_lang_Object_2Ljava_lang_Object_2Ljava_lang_Object_2I
JNIEXPORT jlong JNICALL
Java_com_mbien_opencl_impl_CLImpl_clCreateContextFromType0(JNIEnv *env, jobject _unused,
        jobject props, jint props_byte_offset, jlong device_type, jobject cb, jobject data, jobject errcode, jint errcode_byte_offset) {

    intptr_t * _props_ptr  = NULL;
    int32_t * _errcode_ptr = NULL;
    cl_context _ctx;

    if (props != NULL) {
        _props_ptr = (intptr_t *) (((char*) (*env)->GetDirectBufferAddress(env, props)) + props_byte_offset);
    }
    if (errcode != NULL) {
        _errcode_ptr = (int32_t *) (((char*) (*env)->GetDirectBufferAddress(env, errcode)) + errcode_byte_offset);
    }

    //TODO callback; payload
    _ctx = clCreateContextFromType((intptr_t *) _props_ptr, (uint64_t) device_type, NULL, NULL, (int32_t *) _errcode_ptr);

/*
    printf(" - - - - test - - - -  \n");
    cl_uint err;
    size_t deviceListSize;

    // get the list of GPU devices associated with context
    err = clGetContextInfo(_ctx, CL_CONTEXT_DEVICES, 0, NULL, &deviceListSize);  checkStatus("getContextInfo1", err);
    cl_uint count = (cl_uint)deviceListSize / sizeof(cl_device_id);
    printf("devices: %d \n",  count);
    printf(" - - - - test end - - - -  \n");
*/

    return (jlong)_ctx;
}


/*
JNIEXPORT jlong JNICALL
Java_com_mbien_opencl_impl_CLImpl_clCreateContext0(JNIEnv *env, jobject _unused,
        jobject props, jint props_byte_offset, jlong device_type, jobject cb, jobject data, jobject errcode, jint errcode_byte_offset) {

    intptr_t * _props_ptr  = NULL;
    int32_t * _errcode_ptr = NULL;
    void * _device_ptr = NULL;

    cl_context _res;

    if (props != NULL) {
        _props_ptr = (intptr_t *) (((char*) (*env)->GetDirectBufferAddress(env, props)) + props_byte_offset);
    }

   if (device_type != NULL) {
       _device_ptr = (void *) (((char*) (*env)->GetPrimitiveArrayCritical(env, device_type, NULL)));
   }

   _res = clCreateContext();

   if (device_type != NULL) {
    (*env)->ReleasePrimitiveArrayCritical(env, device_type, _device_ptr, 0);
   }
   return (jlong) (intptr_t) _res;
}
*/

/**
 * Entry point to C language function: <code> int32_t clBuildProgram(cl_program, uint32_t, cl_device_id * , const char * , void (*pfn_notify)(cl_program, void *user_data), void * );
 */
JNIEXPORT jint JNICALL
Java_com_mbien_opencl_impl_CLImpl_clBuildProgram0(JNIEnv *env, jobject _unused,
        jlong program, jint deviceCount, jobject deviceList, jint offset, jstring options, jobject cb, jobject data) {

    const char* _strchars_options = NULL;
    cl_int _res;
    size_t * _deviceListPtr = NULL;

    if (options != NULL) {
        _strchars_options = (*env)->GetStringUTFChars(env, options, (jboolean*)NULL);
        if (_strchars_options == NULL) {
            (*env)->ThrowNew(env, (*env)->FindClass(env, "java/lang/OutOfMemoryError"),
                           "Failed to get UTF-8 chars for argument \"options\" in native dispatcher for \"clBuildProgram\"");
            return CL_FALSE;
        }
    }

    if (deviceList != NULL) {
        _deviceListPtr = (void *) (((char*) (*env)->GetPrimitiveArrayCritical(env, deviceList, NULL)) + offset);
    }
    
    // TODO payload, callback...
    _res = clBuildProgram((cl_program)program, (cl_uint)deviceCount, _deviceListPtr, _strchars_options, NULL, NULL);

    if (deviceList != NULL) {
        (*env)->ReleasePrimitiveArrayCritical(env, deviceList, _deviceListPtr, 0);
    }

    if (options != NULL) {
        (*env)->ReleaseStringUTFChars(env, options, _strchars_options);
    }
    
    return _res;
}