/**********************************************************************
Copyright ©2012 Advanced Micro Devices, Inc. All rights reserved.

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•	Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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#include "IntroStaticCPPKernel.hpp"

#include <vector>
#include <CL/cl.hpp>
#include <iostream>
#include <fstream>
#include <string>


using namespace cl;

/**
* Class Rect
* Class Rect describes rectangles with lengths and widths.
*/
//template <typename T> class Rect;

template <typename T>
class Rect {
	T myLength; /**< length of the rectangle */
	T myWidth; /**< width of the rectangle */
public:
	Rect () {
	}
	Rect (T a, T b) {
		myLength = a;
		myWidth = b;
	}
	T get_length(){
		return myLength;
	}

	T get_width(){
		return myWidth;
	}
};



/******************************************************************************* 
*  @fn     verification 
*  @brief  This function is to check if the.   
*             
*  @param[in] area : area calculated by CPU 
*  @param[in] devArea : area calculated by GPU
*  @param[in] count : size of array 
*           
*  @return int : 0 if successful; otherwise 1. 
*******************************************************************************/

template<typename T>
int verification(T* area, T* devArea,  int count, const char* option)
{

	std::cout <<std::endl<<"The area of the first myRectangle by CPU is:      "<<area[0]<<std::endl; 
	std::cout <<"The area of the first myRectangle by GPU is:      "<<devArea[0]<< "      "<<std::endl;
	std::cout <<std::endl<< "Continue validating..." <<std::endl;

	int isCorrect = 1;
	for (int i = 1; i <= count; i++)
	{
		if((area[i-1] - devArea[i-1])>1e-4)
		{
			isCorrect = 0;
			break;
		}
	}


	if(isCorrect == 1)
	{
		std::cout <<option<<" static C++ kernel is working correctly!!!"<<std::endl<<std::endl<<std::endl;  
		return 0;
	}
	else
	{
		std::cout <<option<<" static C++ kernel is NOT working correctly!!!"<<std::endl<<std::endl<<std::endl;   
		return 1;
	}
};





int main(int argc, char * argv[]) {

	cl_int status = 0;
	const char* buildOption ="-x clc++ ";
	const int LIST_SIZE = 128;




	// Create and initiate arrays of class Rect <float> myRectangle and areas.

	Rect <float> myRectangleF[LIST_SIZE];
	float myAreaF[LIST_SIZE];
	float myDevAreaF[LIST_SIZE];

	Rect <int> myRectangleI[LIST_SIZE];
	int myAreaI[LIST_SIZE];
	int myDevAreaI[LIST_SIZE];

	srand (10);
	for(int i = 0; i < LIST_SIZE; i++) 
	{
		myRectangleF[i] =Rect <float> ((rand() % 15) + (float) 0.1, (rand() % 15) + (float) 0.1);
		myAreaF[i] = myRectangleF[i].get_length() * myRectangleF[i].get_width();
		myDevAreaF[i] = 0;

		myRectangleI[i] =Rect <int> ((rand() % 15) + 1, (rand() % 15) + 1);
		myAreaI[i] = myRectangleI[i].get_length() * myRectangleI[i].get_width();
		myDevAreaI[i] = 0;
	}

	// Get available platforms
	std::vector<Platform> platforms;
	status = Platform::get(&platforms);
	if (status != CL_SUCCESS)
	{
		std::cout<<"Error: Getting platforms!"<<std::endl;
		return SDK_FAILURE;
	}
	std::vector<cl::Platform>::iterator iter;
	for(iter = platforms.begin(); iter != platforms.end(); ++iter)
	{
		if(!strcmp((*iter).getInfo<CL_PLATFORM_VENDOR>().c_str(), "Advanced Micro Devices, Inc."))
		{
			break;
		}
	}
	cl_context_properties cps[3] = {CL_CONTEXT_PLATFORM, (cl_context_properties)(*iter) (), 0};
	Context context = cl::Context(CL_DEVICE_TYPE_GPU, cps, NULL, NULL, &status);

	if (status != CL_SUCCESS)
	{
		std::cout<<"GPU not found, falling back to CPU!"<<std::endl;
		context = cl::Context(CL_DEVICE_TYPE_CPU, cps, NULL, NULL, &status);
		if (status != CL_SUCCESS)
		{
			std::cout<<"Error: Creating context!"<<std::endl;
			return SDK_FAILURE;
		}
	}

	try
	{

		// Get a list of devices on this platform
		std::vector<Device> devices = context.getInfo<CL_CONTEXT_DEVICES>();

		// Create a command queue and use the first device
		CommandQueue queue = CommandQueue(context, devices[0]);

		// Read source file
		std::ifstream sourceFile("IntroStaticCPPKernel_Kernels.cl");
		std::string sourceCode(
			std::istreambuf_iterator<char>(sourceFile),
			(std::istreambuf_iterator<char>()));
		Program::Sources source(1, std::make_pair(sourceCode.c_str(), sourceCode.length()+1));

		// Make program of the source code in the context
		Program program = Program(context, source);

		// Build program for these specific devices
		program.build(devices, buildOption);

		// Make kernel
		Kernel kernelF(program, "AreaCalculation_float");
		Kernel kernelI(program, "AreaCalculation_int");

		// Create memory buffers
		Buffer bufferMyRectangleF = Buffer(context, CL_MEM_READ_WRITE, LIST_SIZE * sizeof(Rect <float>));
		Buffer bufferMyAreaF = Buffer(context, CL_MEM_READ_WRITE, LIST_SIZE * sizeof(float));
		Buffer bufferMyRectangleI = Buffer(context, CL_MEM_READ_WRITE, LIST_SIZE * sizeof(Rect <int>));
		Buffer bufferMyAreaI = Buffer(context, CL_MEM_READ_WRITE, LIST_SIZE * sizeof(int));

		// Copy myRectangle[LIST_SIZE] to the memory buffers
		queue.enqueueWriteBuffer(bufferMyRectangleF, CL_TRUE, 0, LIST_SIZE * sizeof(Rect <float>), myRectangleF);
		queue.enqueueWriteBuffer(bufferMyRectangleI, CL_TRUE, 0, LIST_SIZE * sizeof(Rect <int>), myRectangleI);

		// Set arguments to kernel
		kernelF.setArg(0, bufferMyRectangleF);
		kernelF.setArg(1, bufferMyAreaF);
		kernelI.setArg(0, bufferMyRectangleI);
		kernelI.setArg(1, bufferMyAreaI);

		// Run the kernel on specific ND range
		NDRange global(LIST_SIZE);  
		NDRange local(LIST_SIZE / 2);      
		queue.enqueueNDRangeKernel(kernelF, NullRange, global, local);
		queue.enqueueNDRangeKernel(kernelI, NullRange, global, local);

		// Read buffer back to CPU
		queue.enqueueReadBuffer(bufferMyAreaF, CL_TRUE, 0, LIST_SIZE * sizeof(float), myDevAreaF);
		queue.enqueueReadBuffer(bufferMyAreaI, CL_TRUE, 0, LIST_SIZE * sizeof(int), myDevAreaI);

	}catch(cl::Error e){
		std::cout << "Line "<< __LINE__<<": Error in "<<e.what() <<std::endl;
		return SDK_FAILURE;
	}

	verification(myAreaF, myDevAreaF, LIST_SIZE, "FLOAT");
	verification(myAreaI, myDevAreaI, LIST_SIZE, "INT");

	return SDK_SUCCESS;

}