#include "datafunc.h"

int cal_2d_hx(char* inname,char* outname,char* colname,double* range,double* interval,int power)
{
	ifstream infile(inname);
	if (!infile)
	{
		cout<<BOLDRED<<"==> "<<RESET<<"file not found: "<<inname<<endl;
		return -1;
	}
	else
	{
		string temp_str;
		stringstream temp_ss;
		double temp_x,temp_y,temp_z;

		//添加数据列选项
		int cols[3];
		if (3 != sscanf(colname,"%d,%d,%d",&cols[0],&cols[1],&cols[2]))
		{
			cout<<BOLDRED<<"==> "<<RESET<<"wrong column parameters: "<<colname<<endl;
			return -1;
		}
		double temp_d;
		_1dArray tempRow;


		double xmin = *range; double xmax = *(range+1); double ymin = *(range+2); double ymax = *(range+3);
		double dx = *interval; double dy = *(interval+1);
		int M = floor((ymax-ymin)/dy) + 1;
		int N = floor((xmax-xmin)/dx) + 1;
		double** tabledata = new double* [M];
		for (int i = 0; i < M; i++)
			tabledata[i] = new double [N];

		int M_ex = pow(2,ceil(log(M)/log(2))+1);
		int N_ex = pow(2,ceil(log(N)/log(2))+1);
		int M_ex_up = floor((M_ex - M)/2.0);
		int M_ex_down = ceil((M_ex - M)/2.0);
		int N_ex_left = floor((N_ex - N)/2.0);
		int N_ex_right = ceil((N_ex - N)/2.0);

		double** tabledata_ex = new double* [M_ex];
		for (int i = 0; i < M_ex; i++)
			tabledata_ex[i] = new double [N_ex];

		double** V= new double* [M_ex];
		for (int i = 0; i < M_ex; i++)
			V[i] = new double [N_ex];

		double* endmean = new double [N];
		double* endmean2 = new double [M_ex];

		while(getline(infile,temp_str))
		{
			if (*(temp_str.begin()) == '#') continue;
			else
			{
				temp_ss.str("");
				temp_ss.clear();
				temp_ss << temp_str;

				if(!tempRow.empty()) tempRow.clear();
				while (temp_ss >> temp_d)
				{
					tempRow.push_back(temp_d);
				}

				temp_x = tempRow.at(cols[0]);
				temp_y = tempRow.at(cols[1]);
				temp_z = tempRow.at(cols[2]);
				if (temp_x>=xmin&&temp_x<=xmax&&temp_y>=ymin&&temp_y<=ymax)
				{
					tabledata[int ((temp_y-ymin)/dy)][int ((temp_x-xmin)/dx)] = temp_z;
				}
			}
		}
		infile.close();

		for (int i = 0; i < N; i++)	 endmean[i] = (tabledata[0][i]+tabledata[M-1][i])/2.0;
		for (int i = 0; i < N; i++)
		{
			for (int k = 0; k < M_ex_down; k++)
			{
				tabledata_ex[k][N_ex_left+i] = endmean[i] + (tabledata[0][i]-endmean[i])*cos(-0.5*pi*(k-M_ex_down)/M_ex_down);
			}
			for (int k = 0; k < M; k++)
			{
				tabledata_ex[M_ex_down+k][N_ex_left+i] = tabledata[k][i];
			}
			for (int k = 0; k < M_ex_up; k++)
			{
				tabledata_ex[M_ex_down+M+k][N_ex_left+i] = endmean[i] + (tabledata[M-1][i]-endmean[i])*cos(0.5*pi*(k+1)/M_ex_up); 
			}
		}
		for (int i = 0; i < M_ex; i++) endmean2[i] = (tabledata_ex[i][N_ex_left]+tabledata_ex[i][N_ex_left+N-1])/2.0;
		for (int i = 0; i < M_ex; i++)
		{
			for (int k = 0; k < N_ex_left; k++)
			{
				tabledata_ex[i][k] = endmean2[i] + (tabledata_ex[i][N_ex_left]-endmean2[i])*cos(-0.5*pi*(k-N_ex_left)/N_ex_left);
			}
			for (int k = 0; k < N_ex_right; k++)
			{
				tabledata_ex[i][N_ex_left+N+k] = endmean2[i] + (tabledata_ex[i][N_ex_left+N-1]-endmean2[i])*cos(0.5*pi*(k+1)/N_ex_right);
			}
		}

		fftw_complex *in, *out, *after_out, *reout;
		fftw_plan p;
		in = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * M_ex * N_ex);
		out = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * M_ex * N_ex);
		after_out = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * M_ex * N_ex);
		reout = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * M_ex * N_ex);

		for (int i = 0; i < M_ex; i++)
		{
			for (int j = 0; j < N_ex; j++)
			{
				in[i*N_ex+j][0] = tabledata_ex[i][j];
				in[i*N_ex+j][1] = 0;
			}
		}

		p=fftw_plan_dft_2d(M_ex, N_ex,in , out, FFTW_FORWARD, FFTW_ESTIMATE);
		fftw_execute(p);
		
		int half_M_ex = M_ex/2;
		double du = 1.0/((M_ex-1)*dx);
		
		int k;
		for (int i = 0; i < N_ex; i++)
		{
			for (int j = 0; j < half_M_ex; j++)
			{
				k = M_ex - 1 - j;
				V[j][i] = du*j;
				V[k][i] = -1*du*j;
			}
		}
		
		for (int i = 0; i < M_ex; i++)
		{
			for (int j = 0; j < N_ex; j++)
			{
				after_out[i*N_ex+j][0] = out[i*N_ex+j][1]*pow(2*pi*V[i][j],power);
				after_out[i*N_ex+j][1] = out[i*N_ex+j][0]*pow(2*pi*V[i][j],power);
			}
		}

		p=fftw_plan_dft_2d(M_ex, N_ex, after_out, reout, FFTW_BACKWARD, FFTW_ESTIMATE);
    	fftw_execute(p);

    	for (int i = 0; i < M_ex; i++)
    	{
    		for (int j = 0; j < N_ex; j++)
    		{
    			tabledata_ex[i][j] = 0.1*reout[i*N_ex+j][0]/(M_ex*N_ex);
    		}
    	}

    	ofstream outfile(outname);
    	for (int i = 0; i < M; i++)
    	{
    		for (int j = 0; j < N; j++)
    		{
    			outfile<<xmax-dx*j<<" "<<ymax-dy*i<<" "<<setprecision(16)<<tabledata_ex[M_ex_down+i][N_ex_left+j]<<endl;
    		}
    	}
    	outfile.close();

    	fftw_destroy_plan(p);
	    fftw_free(in); 
	    fftw_free(out);
	    fftw_free(after_out);
		fftw_free(reout);
		for (int i = 0; i < M_ex; i++)
			delete[] tabledata_ex[i];
		delete[] tabledata_ex;
		for (int i = 0; i < M_ex; i++)
			delete[] V[i];
		delete[] V;
		for (int i = 0; i < M; i++)
			delete[] tabledata[i];
		delete[] tabledata;
		delete[] endmean;
		delete[] endmean2;
		return 0;
	}
}