#include <stdio.h>
#include <string.h>
#include <pslib.h>

#include "tap.h"
#include "pstap.h"

int SaveImage (psMetadata *header, psImage *image, char *filename) {

    psFits *fits = psFitsOpen (filename, "w");
    psFitsWriteImage (fits, NULL, image, 0, NULL);
    psFitsClose (fits);
    return (TRUE);
}

# define C00 +0.5
# define C01 +0.1
# define C10 -0.2

int main (void)
{

    // plan_tests(0);
    
    // *** tests to demonstrate the validity of the algorithm or concept ***

    // make a model for a well-sampled field of a simple function (f = ax + by + c)
    # if (0)
    {
	// function is defined over the range 0-1000, 0-1000
	psImageBinning *binning = psImageBinningAlloc();
	binning->nXfine = 1000;
	binning->nYfine = 1000;
	binning->nXruff = 5;
	binning->nYruff = 5;

	// generate a grid of test data points
	psVector *x = psVectorAllocEmpty (100, PS_TYPE_F32);
	psVector *y = psVectorAllocEmpty (100, PS_TYPE_F32);
	psVector *f = psVectorAllocEmpty (100, PS_TYPE_F32);

	for (int ix = 0; ix < 1000; ix += 20) {
	    for (int iy = 0; iy < 1000; iy += 20) {
		x->data.F32[x->n] = ix;
		y->data.F32[y->n] = iy;
		f->data.F32[f->n] = C00 + C10*ix + C01*iy;
		psVectorExtend (x, 100, 1);
		psVectorExtend (y, 100, 1);
		psVectorExtend (f, 100, 1);
	    }
	}

	psStats *stats = psStatsAlloc (PS_STAT_SAMPLE_MEDIAN);

	// scale defines both field and map image sizes (nXfine, nXruff)
	psImageMap *map = psImageMapAlloc (NULL, binning, stats);

	// allocate a map, but we have no field image to supply
	// XXX this function needs to correct for the mean superpixel position 
	// which is sampled...
	psImageMapGenerate (map, x, y, f, 0.1);
	psFree (binning);

	fprintf (stderr, "nGood: %d\n", map->nGood);
	fprintf (stderr, "nPoor: %d\n", map->nPoor);
	fprintf (stderr, "nBad:  %d\n", map->nBad);
	
	SaveImage (NULL, map->map, "map.fits");
	
	psImage *field = psImageAlloc(1000, 1000, PS_TYPE_F32);
	for (int ix = 0; ix < 1000; ix++) {
	    for (int iy = 0; iy < 1000; iy++) {
		field->data.F32[iy][ix] = C00 + C10*ix + C01*iy;
	    }
	}
	SaveImage (NULL, field, "field.fits");

	// measure difference between model (map) and data (field)
	for (int ix = 0; ix < map->map->numCols; ix++) {
	    for (int iy = 0; iy < map->map->numRows; iy++) {
		int xo = psImageBinningGetFineX(map->binning, ix + 0.5);
		int yo = psImageBinningGetFineY(map->binning, iy + 0.5);
		float df = field->data.F32[yo][xo] - map->map->data.F32[iy][ix];
		fprintf (stderr, "%d %d -> %d %d  :  %f = %f - %f\n", ix, iy, xo, yo, df, field->data.F32[yo][xo], map->map->data.F32[iy][ix]);
	    }
	}

	psImage *model = psImageAlloc(1000, 1000, PS_TYPE_F32);
	for (int ix = 0; ix < 1000; ix++) {
	    for (int iy = 0; iy < 1000; iy++) {
		model->data.F32[iy][ix] = psImageUnbinPixel (ix + 0.5, iy + 0.5, map->map, map->binning);
	    }
	}
	SaveImage (NULL, model, "model.fits");
    }
    # endif

    // make a model for a poorly-sampled field of a simple function (f = ax + by + c)

    // choose a model scale for a poorly-sampled field of a simple function (f = ax + by + c)

    // make a model for a well-sampled field of a high-order polynomial function (f = (a(x-xo)^2 + b(y-yo)^2) + c)
    # if (0)
    {
	// function is defined over the range 0-1000, 0-1000
	psImageBinning *binning = psImageBinningAlloc();
	binning->nXfine = 1000;
	binning->nYfine = 1000;
	binning->nXruff = 5;
	binning->nYruff = 5;

	// generate a grid of test data points
	psVector *x = psVectorAllocEmpty (100, PS_TYPE_F32);
	psVector *y = psVectorAllocEmpty (100, PS_TYPE_F32);
	psVector *f = psVectorAllocEmpty (100, PS_TYPE_F32);

	for (int ix = 0; ix < 1000; ix += 20) {
	    for (int iy = 0; iy < 1000; iy += 20) {
		x->data.F32[x->n] = ix;
		y->data.F32[y->n] = iy;
		f->data.F32[f->n] = C10*PS_SQR(ix-500) + C01*PS_SQR(iy-500);
		psVectorExtend (x, 100, 1);
		psVectorExtend (y, 100, 1);
		psVectorExtend (f, 100, 1);
	    }
	}

	psStats *stats = psStatsAlloc (PS_STAT_SAMPLE_MEDIAN);

	// scale defines both field and map image sizes (nXfine, nXruff)
	psImageMap *map = psImageMapAlloc (NULL, binning, stats);

	// allocate a map, but we have no field image to supply
	// XXX this function needs to correct for the mean superpixel position 
	// which is sampled...
	psImageMapGenerate (map, x, y, f, 0.1);
	psFree (binning);

	fprintf (stderr, "nGood: %d\n", map->nGood);
	fprintf (stderr, "nPoor: %d\n", map->nPoor);
	fprintf (stderr, "nBad:  %d\n", map->nBad);
	
	SaveImage (NULL, map->map, "map.fits");
	
	psImage *field = psImageAlloc(1000, 1000, PS_TYPE_F32);
	for (int ix = 0; ix < 1000; ix++) {
	    for (int iy = 0; iy < 1000; iy++) {
		field->data.F32[iy][ix] = C10*PS_SQR(ix-500) + C01*PS_SQR(iy-500);
	    }
	}
	SaveImage (NULL, field, "field.fits");

	// measure difference between model (map) and data (field)
	for (int ix = 0; ix < map->map->numCols; ix++) {
	    for (int iy = 0; iy < map->map->numRows; iy++) {
		int xo = psImageBinningGetFineX(map->binning, ix + 0.5);
		int yo = psImageBinningGetFineY(map->binning, iy + 0.5);
		float df = field->data.F32[yo][xo] - map->map->data.F32[iy][ix];
		fprintf (stderr, "%d %d -> %d %d  :  %f = %f - %f\n", ix, iy, xo, yo, df, field->data.F32[yo][xo], map->map->data.F32[iy][ix]);
	    }
	}
    }
    # endif

    // make a model for a well-sampled field of a high-order polynomial function (f = (a(x-xo)^2 + b(y-yo)^2) + c)
    # if (1)
    {
	// function is defined over the range 0-1000, 0-1000
	psImageBinning *binning = psImageBinningAlloc();
	binning->nXfine = 1000;
	binning->nYfine = 1000;
	binning->nXruff = 5;
	binning->nYruff = 5;

	// generate a grid of test data points
	psVector *x = psVectorAllocEmpty (100, PS_TYPE_F32);
	psVector *y = psVectorAllocEmpty (100, PS_TYPE_F32);
	psVector *f = psVectorAllocEmpty (100, PS_TYPE_F32);

	for (int ix = 0; ix < 1000; ix += 20) {
	    for (int iy = 0; iy < 1000; iy += 20) {
		x->data.F32[x->n] = ix;
		y->data.F32[y->n] = iy;
		f->data.F32[f->n] = C10*(ix-500) + PS_SQR(C01*(iy-500));
		psVectorExtend (x, 100, 1);
		psVectorExtend (y, 100, 1);
		psVectorExtend (f, 100, 1);
	    }
	}

	psStats *stats = psStatsAlloc (PS_STAT_SAMPLE_MEDIAN);

	// scale defines both field and map image sizes (nXfine, nXruff)
	psImageMap *map = psImageMapAlloc (NULL, binning, stats);

	// allocate a map, but we have no field image to supply
	// XXX this function needs to correct for the mean superpixel position 
	// which is sampled...
	psImageMapGenerate (map, x, y, f, 0.1);
	psFree (binning);

	fprintf (stderr, "nGood: %d\n", map->nGood);
	fprintf (stderr, "nPoor: %d\n", map->nPoor);
	fprintf (stderr, "nBad:  %d\n", map->nBad);
	
	SaveImage (NULL, map->map, "map.fits");
	
	psImage *field = psImageAlloc(1000, 1000, PS_TYPE_F32);
	for (int ix = 0; ix < 1000; ix++) {
	    for (int iy = 0; iy < 1000; iy++) {
		field->data.F32[iy][ix] = C10*(ix-500) + PS_SQR(C01*(iy-500));
	    }
	}
	SaveImage (NULL, field, "field.fits");

	// measure difference between model (map) and data (field)
	for (int ix = 0; ix < map->map->numCols; ix++) {
	    for (int iy = 0; iy < map->map->numRows; iy++) {
		int xo = psImageBinningGetFineX(map->binning, ix + 0.5);
		int yo = psImageBinningGetFineY(map->binning, iy + 0.5);
		float df = field->data.F32[yo][xo] - map->map->data.F32[iy][ix];
		fprintf (stderr, "%d %d -> %d %d  :  %f = %f - %f\n", ix, iy, xo, yo, df, field->data.F32[yo][xo], map->map->data.F32[iy][ix]);
	    }
	}


	psImage *model = psImageAlloc(1000, 1000, PS_TYPE_F32);
	for (int ix = 0; ix < 1000; ix++) {
	    for (int iy = 0; iy < 1000; iy++) {
		// XXX the binned coordinates are probably off by 0.5 pix, or we are interpolating 
		// to the wrong binned coordinate.  
		// XXX fix edge cases
		model->data.F32[iy][ix] = psImageUnbinPixel (ix + 0.5, iy + 0.5, map->map, map->binning);
	    }
	}
	SaveImage (NULL, model, "model.fits");
    }
    # endif

    // make a model for a poorly-sampled field of a non-polynomial function (f = (a(x-xo)^2 + b(y-yo)^2)^-1)

    // choose a model scale for a poorly-sampled field of a non-polynomial function (f = (a(x-xo)^2 + b(y-yo)^2)^-1)

}   
