/* NiuTrans.Tensor - an open-source tensor library
* Copyright (C) 2017, Natural Language Processing Lab, Northestern University.
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

/*
* $Created by: Lin Ye (email: linye2015@outlook.com) 2018-08-03
*/

#include "../XTensor.h"
#include "TClip.h"

namespace nts { // namespace nts(NiuTrans.Tensor)

/*
case 1: test Clip function.
Set every entry to its clip value.
*/
bool TestClip1()
{
	/* a tensor of size (3, 2) */
	int aOrder = 2;
	int * aDimSize = new int[aOrder];
	aDimSize[0] = 3;
	aDimSize[1] = 2;

	int aUnitNum = 1;
	for (int i = 0; i < aOrder; i++)
		aUnitNum *= aDimSize[i];

	DTYPE aData[3][2] = { {1.0F, -2.0F},
						  {0.0F, 4.0F},
						  {5.0F, -6.0F} };
	DTYPE answer[3][2] = { {1.0F, -1.0F},
						   {0.0F, 1.0F},
					   	   {1.0F, -1.0F} };

	/* CPU test */
	bool cpuTest = true;

	/* create tensors */
	XTensor * a = NewTensor(aOrder, aDimSize);
	XTensor * b = NewTensor(aOrder, aDimSize);
	XTensor * aMe = NewTensor(aOrder, aDimSize);
	XTensor bUser;

	/* initialize variables */
	a->SetData(aData, aUnitNum);
	aMe->SetData(aData, aUnitNum);

	/* call Clip function */
	_Clip(a, b, -1.0, 1.0);
	_ClipMe(aMe, -1.0, 1.0);
	bUser = Clip(*a, -1.0, 1.0);

	/* check results */
	cpuTest = b->CheckData(answer, aUnitNum, 1e-4F) && 
              aMe->CheckData(answer, aUnitNum, 1e-4F) && 
              bUser.CheckData(answer, aUnitNum, 1e-4F);

#ifdef USE_CUDA
	/* GPU test */
	bool gpuTest = true;

	/* create tensor */
	XTensor * aGPU = NewTensor(aOrder, aDimSize, X_FLOAT, 1.0F, 0);
	XTensor * bGPU = NewTensor(aOrder, aDimSize, X_FLOAT, 1.0F, 0);
	XTensor * aMeGPU = NewTensor(aOrder, aDimSize, X_FLOAT, 1.0F, 0);
	XTensor bUserGPU;

	/* Initialize variables */
	aGPU->SetData(aData, aUnitNum);
	aMeGPU->SetData(aData, aUnitNum);

	/* call Clip function */
	_Clip(aGPU, bGPU, -1.0, 1.0);
	_ClipMe(aMeGPU, -1.0, 1.0);
	bUserGPU = Clip(*aGPU, -1.0, 1.0);

	/* check results */
	gpuTest = bGPU->CheckData(answer, aUnitNum, 1e-4F) && 
              aMeGPU->CheckData(answer, aUnitNum, 1e-4F) && 
              bUserGPU.CheckData(answer, aUnitNum, 1e-4F);

	/* destroy variables */
	delete a;
	delete b;
	delete aMe;
	delete aGPU;
	delete bGPU;
	delete aMeGPU;
	delete[] aDimSize;

	return cpuTest && gpuTest;
#else
	/* destroy variables */
	delete a;
	delete b;
	delete aMe;
	delete[] aDimSize;

	return cpuTest;
#endif // USE_CUDA
}

/* other cases */
/*
TODO!!
*/

/* test for Clip Function */
bool TestClip()
{
	XPRINT(0, stdout, "[TEST Clip] set every entry to its clip value \n");
	bool returnFlag = true, caseFlag = true;

	/* case 1 test */
	caseFlag = TestClip1();

	if (!caseFlag) {
		returnFlag = false;
		XPRINT(0, stdout, ">> case 1 failed!\n");
	}
	else
		XPRINT(0, stdout, ">> case 1 passed!\n");

	/* other cases test */
	/*
	TODO!!
	*/

	if (returnFlag) {
		XPRINT(0, stdout, ">> All Passed!\n");
	}
	else
		XPRINT(0, stdout, ">> Failed!\n");

	XPRINT(0, stdout, "\n");

	return returnFlag;
}

} // namespace nts(NiuTrans.Tensor)
