#include <lcms.h>

#include "pnm.h"

static int
pam_transform(FILE *in_fp, FILE *out_fp,
	const struct pnm *in_pnm, cmsHTRANSFORM *hTransform);

int
main(int argc, char **argv) {
	int c, i, nProf = 0;
	char *in_prof = NULL, *out_prof = NULL;
	double gamma = 0.0, bright = 0.0, contrast = 1.0, hue = 0.0;
	double saturation = 0.0;
	int tempSrc = 5000, tempDst = 5000;
	cmsHTRANSFORM hTransform;
	cmsHPROFILE profiles[3];
	DWORD type;
	struct pnm in_pnm;

	while ((c = getopt(argc, argv, "i:o:g:b:c:h:s:S:D:")) != EOF) {
		switch (c) {  
			case 'i':
				in_prof = optarg;
				break;
			case 'o':
				out_prof = optarg;
				break;
			case 'g':
				gamma = atof(optarg);
				break;
			case 'b':
				bright = atof(optarg);
				break;
			case 'c':
				contrast = atof(optarg);
				break;
			case 'h':
				hue = atof(optarg);
				break;
			case 's':
				saturation = atof(optarg);
				break;
			case 'S':
				tempSrc = atoi(optarg);
				break;
			case 'D':
				tempDst = atoi(optarg);
				break;

			default:
				break;
		}
	}

	if (in_prof) {
		profiles[nProf++] = cmsOpenProfileFromFile(in_prof, "r");
	} else {
		profiles[nProf++] = cmsCreate_sRGBProfile();
	}

	if (gamma) {
		LPGAMMATABLE gTable[3];

		gTable[0] = cmsBuildGamma(256, gamma);
		gTable[1] = gTable[2] = cmsBuildGamma(256, 1.0);

		profiles[nProf++] = cmsCreateLinearizationDeviceLink(
			icSigLabData,
			gTable);
	}

	profiles[nProf++] = cmsCreateBCHSWabstractProfile(
		10,
		bright,
		contrast,
		hue,
		saturation,
		tempSrc,
		tempDst);

	if (out_prof) {
		profiles[nProf++] = cmsOpenProfileFromFile(out_prof, "r");
	} else {
		profiles[nProf++] = cmsCreate_sRGBProfile();
	}

	if (readPnmHeader(stdin, &in_pnm) != 0) {
		exit(1);
	}

	if (in_pnm.maxval == 255) {
		type = TYPE_RGB_8;
	} else if (in_pnm.maxval == 65535) {
		type = TYPE_RGB_16_SE;
	} else {
		fprintf(stderr, "unsupported PNM maxval %d\n", in_pnm.maxval);
		exit(1);
	}

	hTransform = cmsCreateMultiprofileTransform(
		profiles,
		nProf,
		type,
		type,
		INTENT_PERCEPTUAL,
		cmsFLAGS_BLACKPOINTCOMPENSATION);
	
	writePnmHeader(stdout, &in_pnm);

	pam_transform(stdin, stdout, &in_pnm, &hTransform);

	cmsDeleteTransform(hTransform);
	
	for (i = 0; i < nProf; i++) {
	//	cmsCloseProfile(profiles[i]);
	}

	return 0;
}

static int
pam_transform(FILE *in_fp, FILE *out_fp,
	const struct pnm *in_pnm, cmsHTRANSFORM *hTransform)
{
	int row, col;
	int nbytes = in_pnm->maxval == 65535?2:1;
	char *buf = malloc(in_pnm->width * nbytes * 3);

	for (row = 0; row < in_pnm->height; row++) {
		fread(buf, in_pnm->width, nbytes * 3, in_fp);

		cmsDoTransform(*hTransform, buf, buf, in_pnm->width);

		fwrite(buf, in_pnm->width, nbytes * 3, out_fp);
	}

	free(buf);
	return 0;
}