#include <stdio.h>
#include "hip/hip_runtime.h"

#define NBLOCKS 1024
#define NTHREADS 256

__global__ void dvc_ScaLBL_D3Q19_AAeven_BGK(double *dist, int start, int finish, int Np, double rlx, double Fx, double Fy, double Fz){
	int n;
	// conserved momemnts
	double rho,ux,uy,uz,uu;
	// non-conserved moments
	double f0,f1,f2,f3,f4,f5,f6,f7,f8,f9,f10,f11,f12,f13,f14,f15,f16,f17,f18;

	int S = Np/NBLOCKS/NTHREADS + 1;
	for (int s=0; s<S; s++){
	    //........Get 1-D index for this thread....................
	    		  n = S*blockIdx.x*blockDim.x + s*blockDim.x + threadIdx.x + start;

			    if ( n<finish ){
		// q=0
		f0 = dist[n];
		f1 = dist[2*Np+n];
		f2 = dist[1*Np+n];
		f3 = dist[4*Np+n];
		f4 = dist[3*Np+n];
		f5 = dist[6*Np+n];
		f6 = dist[5*Np+n];
		f7 = dist[8*Np+n];
		f8 = dist[7*Np+n];
		f9 = dist[10*Np+n];
		f10 = dist[9*Np+n];
		f11 = dist[12*Np+n];
		f12 = dist[11*Np+n];
		f13 = dist[14*Np+n];
		f14 = dist[13*Np+n];
		f15 = dist[16*Np+n];
		f16 = dist[15*Np+n];
		f17 = dist[18*Np+n];
		f18 = dist[17*Np+n];

		rho = f0+f2+f1+f4+f3+f6+f5+f8+f7+f10+f9+f12+f11+f14+f13+f16+f15+f18+f17;
		ux = f1-f2+f7-f8+f9-f10+f11-f12+f13-f14;
		uy = f3-f4+f7-f8-f9+f10+f15-f16+f17-f18;
		uz = f5-f6+f11-f12-f13+f14+f15-f16-f17+f18;
		uu = 1.5*(ux*ux+uy*uy+uz*uz);

		// q=0
		dist[n] = f0*(1.0-rlx)+rlx*0.3333333333333333*(1.0-uu);

		// q = 1
		dist[1*Np+n] = f1*(1.0-rlx) + rlx*0.05555555555555555*(rho + 3.0*ux + 4.5*ux*ux - uu) + 0.16666666*Fx;

		// q=2
		dist[2*Np+n] = f2*(1.0-rlx) + rlx*0.05555555555555555*(rho - 3.0*ux + 4.5*ux*ux - uu)-  0.16666666*Fx;

		// q = 3
		dist[3*Np+n] = f3*(1.0-rlx) +
				rlx*0.05555555555555555*(rho + 3.0*uy + 4.5*uy*uy - uu) + 0.16666666*Fy;

		// q = 4
		dist[4*Np+n] = f4*(1.0-rlx) + 
				rlx*0.05555555555555555*(rho - 3.0*uy + 4.5*uy*uy - uu)- 0.16666666*Fy;

		// q = 5
		dist[5*Np+n] = f5*(1.0-rlx) + 
				rlx*0.05555555555555555*(rho + 3.0*uz + 4.5*uz*uz - uu) + 0.16666666*Fz;

		// q = 6
		dist[6*Np+n] = f6*(1.0-rlx) + 
				rlx*0.05555555555555555*(rho - 3.0*uz + 4.5*uz*uz - uu) - 0.16666666*Fz;

		// q = 7
		dist[7*Np+n] = f7*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho + 3.0*(ux+uy) + 4.5*(ux+uy)*(ux+uy) - uu) + 0.08333333333*(Fx+Fy);

		// q = 8
		dist[8*Np+n] = f8*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho - 3.0*(ux+uy) + 4.5*(ux+uy)*(ux+uy) - uu) - 0.08333333333*(Fx+Fy);

		// q = 9
		dist[9*Np+n] = f9*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho + 3.0*(ux-uy) + 4.5*(ux-uy)*(ux-uy) - uu) + 0.08333333333*(Fx-Fy);

		// q = 10
		dist[10*Np+n] = f10*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho - 3.0*(ux-uy) + 4.5*(ux-uy)*(ux-uy) - uu) - 0.08333333333*(Fx-Fy);

		// q = 11
		dist[11*Np+n] = f11*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho + 3.0*(ux+uz) + 4.5*(ux+uz)*(ux+uz) - uu) + 0.08333333333*(Fx+Fz);

		// q = 12
		dist[12*Np+n] = f12*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho - 3.0*(ux+uz) + 4.5*(ux+uz)*(ux+uz) - uu)  - 0.08333333333*(Fx+Fz);

		// q = 13
		dist[13*Np+n] = f13*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho + 3.0*(ux-uz) + 4.5*(ux-uz)*(ux-uz) - uu) + 0.08333333333*(Fx-Fz);

		// q= 14
		dist[14*Np+n] = f14*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho - 3.0*(ux-uz) + 4.5*(ux-uz)*(ux-uz) - uu)- 0.08333333333*(Fx-Fz);

		// q = 15
		dist[15*Np+n] = f15*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho + 3.0*(uy+uz) + 4.5*(uy+uz)*(uy+uz) - uu) + 0.08333333333*(Fy+Fz);

		// q = 16
		dist[16*Np+n] = f16*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho - 3.0*(uy+uz) + 4.5*(uy+uz)*(uy+uz) - uu) - 0.08333333333*(Fy+Fz);

		// q = 17
		dist[17*Np+n] = f17*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho + 3.0*(uy-uz) + 4.5*(uy-uz)*(uy-uz) - uu) + 0.08333333333*(Fy-Fz);

		// q = 18
		dist[18*Np+n] = f18*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho - 3.0*(uy-uz) + 4.5*(uy-uz)*(uy-uz) - uu) - 0.08333333333*(Fy-Fz);

		//........................................................................
		}
	}
}

__global__ void dvc_ScaLBL_D3Q19_AAodd_BGK(int *neighborList, double *dist, int start, int finish, int Np, double rlx, double Fx, double Fy, double Fz){
	int n;
	// conserved momemnts
	double rho,ux,uy,uz,uu;
	// non-conserved moments
	double f0,f1,f2,f3,f4,f5,f6,f7,f8,f9,f10,f11,f12,f13,f14,f15,f16,f17,f18;
	int nr1,nr2,nr3,nr4,nr5,nr6,nr7,nr8,nr9,nr10,nr11,nr12,nr13,nr14,nr15,nr16,nr17,nr18;

	int S = Np/NBLOCKS/NTHREADS + 1;
	for (int s=0; s<S; s++){
	    //........Get 1-D index for this thread....................
	    		  n = S*blockIdx.x*blockDim.x + s*blockDim.x + threadIdx.x + start;

			    if ( n<finish ){		
		// q=0
		f0 = dist[n];
		// q=1
		nr1 = neighborList[n]; // neighbor 2 ( > 10Np => odd part of dist)
		f1 = dist[nr1]; // reading the f1 data into register fq

		nr2 = neighborList[n+Np]; // neighbor 1 ( < 10Np => even part of dist)
		f2 = dist[nr2];  // reading the f2 data into register fq

		// q=3
		nr3 = neighborList[n+2*Np]; // neighbor 4
		f3 = dist[nr3];

		// q = 4
		nr4 = neighborList[n+3*Np]; // neighbor 3
		f4 = dist[nr4];

		// q=5
		nr5 = neighborList[n+4*Np];
		f5 = dist[nr5];

		// q = 6
		nr6 = neighborList[n+5*Np];
		f6 = dist[nr6];
		
		// q=7
		nr7 = neighborList[n+6*Np];
		f7 = dist[nr7];

		// q = 8
		nr8 = neighborList[n+7*Np];
		f8 = dist[nr8];

		// q=9
		nr9 = neighborList[n+8*Np];
		f9 = dist[nr9];

		// q = 10
		nr10 = neighborList[n+9*Np];
		f10 = dist[nr10];

		// q=11
		nr11 = neighborList[n+10*Np];
		f11 = dist[nr11];

		// q=12
		nr12 = neighborList[n+11*Np];
		f12 = dist[nr12];

		// q=13
		nr13 = neighborList[n+12*Np];
		f13 = dist[nr13];

		// q=14
		nr14 = neighborList[n+13*Np];
		f14 = dist[nr14];

		// q=15
		nr15 = neighborList[n+14*Np];
		f15 = dist[nr15];

		// q=16
		nr16 = neighborList[n+15*Np];
		f16 = dist[nr16];

		// q=17
		//fq = dist[18*Np+n];
		nr17 = neighborList[n+16*Np];
		f17 = dist[nr17];

		// q=18
		nr18 = neighborList[n+17*Np];
		f18 = dist[nr18];

		rho = f0+f2+f1+f4+f3+f6+f5+f8+f7+f10+f9+f12+f11+f14+f13+f16+f15+f18+f17;
		ux = f1-f2+f7-f8+f9-f10+f11-f12+f13-f14;
		uy = f3-f4+f7-f8-f9+f10+f15-f16+f17-f18;
		uz = f5-f6+f11-f12-f13+f14+f15-f16-f17+f18;
		uu = 1.5*(ux*ux+uy*uy+uz*uz);

		// q=0
		dist[n] = f0*(1.0-rlx)+rlx*0.3333333333333333*(1.0-uu);

		// q = 1
		dist[nr2] = f1*(1.0-rlx) + rlx*0.05555555555555555*(rho + 3.0*ux + 4.5*ux*ux - uu) + 0.16666666*Fx;

		// q=2
		dist[nr1] = f2*(1.0-rlx) + rlx*0.05555555555555555*(rho - 3.0*ux + 4.5*ux*ux - uu)-  0.16666666*Fx;

		// q = 3
		dist[nr4] = f3*(1.0-rlx) +
				rlx*0.05555555555555555*(rho + 3.0*uy + 4.5*uy*uy - uu) + 0.16666666*Fy;

		// q = 4
		dist[nr3] = f4*(1.0-rlx) + 
				rlx*0.05555555555555555*(rho - 3.0*uy + 4.5*uy*uy - uu)- 0.16666666*Fy;

		// q = 5
		dist[nr6] = f5*(1.0-rlx) + 
				rlx*0.05555555555555555*(rho + 3.0*uz + 4.5*uz*uz - uu) + 0.16666666*Fz;

		// q = 6
		dist[nr5] = f6*(1.0-rlx) + 
				rlx*0.05555555555555555*(rho - 3.0*uz + 4.5*uz*uz - uu) - 0.16666666*Fz;

		// q = 7
		dist[nr8] = f7*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho + 3.0*(ux+uy) + 4.5*(ux+uy)*(ux+uy) - uu) + 0.08333333333*(Fx+Fy);

		// q = 8
		dist[nr7] = f8*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho - 3.0*(ux+uy) + 4.5*(ux+uy)*(ux+uy) - uu) - 0.08333333333*(Fx+Fy);

		// q = 9
		dist[nr10] = f9*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho + 3.0*(ux-uy) + 4.5*(ux-uy)*(ux-uy) - uu) + 0.08333333333*(Fx-Fy);

		// q = 10
		dist[nr9] = f10*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho - 3.0*(ux-uy) + 4.5*(ux-uy)*(ux-uy) - uu) - 0.08333333333*(Fx-Fy);

		// q = 11
		dist[nr12] = f11*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho + 3.0*(ux+uz) + 4.5*(ux+uz)*(ux+uz) - uu) + 0.08333333333*(Fx+Fz);

		// q = 12
		dist[nr11] = f12*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho - 3.0*(ux+uz) + 4.5*(ux+uz)*(ux+uz) - uu)  - 0.08333333333*(Fx+Fz);

		// q = 13
		dist[nr14] = f13*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho + 3.0*(ux-uz) + 4.5*(ux-uz)*(ux-uz) - uu) + 0.08333333333*(Fx-Fz);

		// q= 14
		dist[nr13] = f14*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho - 3.0*(ux-uz) + 4.5*(ux-uz)*(ux-uz) - uu)- 0.08333333333*(Fx-Fz);

		// q = 15
		dist[nr16] = f15*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho + 3.0*(uy+uz) + 4.5*(uy+uz)*(uy+uz) - uu) + 0.08333333333*(Fy+Fz);

		// q = 16
		dist[nr15] = f16*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho - 3.0*(uy+uz) + 4.5*(uy+uz)*(uy+uz) - uu) - 0.08333333333*(Fy+Fz);

		// q = 17
		dist[nr18] = f17*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho + 3.0*(uy-uz) + 4.5*(uy-uz)*(uy-uz) - uu) + 0.08333333333*(Fy-Fz);

		// q = 18
		dist[nr17] = f18*(1.0-rlx) + 
				rlx*0.02777777777777778*(rho - 3.0*(uy-uz) + 4.5*(uy-uz)*(uy-uz) - uu) - 0.08333333333*(Fy-Fz);
		}
	}
}

extern "C" void ScaLBL_D3Q19_AAeven_BGK(double *dist, int start, int finish, int Np, double rlx, double Fx, double Fy, double Fz){
	
    dvc_ScaLBL_D3Q19_AAeven_BGK<<<NBLOCKS,NTHREADS >>>(dist,start,finish,Np,rlx,Fx,Fy,Fz);

    hipError_t err = hipGetLastError();
	if (hipSuccess != err){
		printf("CUDA error in ScaLBL_D3Q19_AAeven_BGK: %s \n",hipGetErrorString(err));
	}
}

extern "C" void ScaLBL_D3Q19_AAodd_BGK(int *neighborList, double *dist, int start, int finish, int Np, double rlx, double Fx, double Fy, double Fz){
    dvc_ScaLBL_D3Q19_AAodd_BGK<<<NBLOCKS,NTHREADS >>>(neighborList,dist,start,finish,Np,rlx,Fx,Fy,Fz);

    hipError_t err = hipGetLastError();
	if (hipSuccess != err){
		printf("CUDA error in ScaLBL_D3Q19_AAeven_BGK: %s \n",hipGetErrorString(err));
	}
}