// 
// Copyright 2006 by Johannes Hofmann
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//

#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>

#include "util.h"

#include "JpgcomImageMetaData.H"

#define GIPFEL_FORMAT_1 "gipfel: longitude %lf, latitude %lf, height %lf, direction %lf, nick %lf, tilt %lf, scale %lf, projection type %d"
#define GIPFEL_FORMAT_2 "gipfel: longitude %lf, latitude %lf, height %lf, direction %lf, nick %lf, tilt %lf, focallength_sensor_ratio %lf, projection type %d"

int
JpgcomImageMetaData::load_image(char *name) {
	char * args[32];
	FILE *p;
	pid_t pid;
	int status;
	char buf[1024];
	double lo, la, he, dir, ni, ti, fr;
	int pt;
	int ret = 1;

	args[0] = "rdjpgcom";
	args[1] = name;
	args[2] = NULL;
  
	p = pexecvp(args[0], args, &pid, "r");

	if (p) {
		while (fgets(buf, sizeof(buf), p) != NULL) {
			if (sscanf(buf, GIPFEL_FORMAT_2,
					&lo, &la, &he, &dir, &ni, &ti, &fr, &pt) >= 7) {

				longitude = lo;
				latitude  = la;
				height    = he;
				direction = dir;
				nick      = ni;
				tilt      = ti;
				focallength_sensor_ratio = fr;
				projection_type = pt;	

				ret = 0;

				break;
			} else if (sscanf(buf, GIPFEL_FORMAT_1,
					&lo, &la, &he, &dir, &ni, &ti, &fr, &pt) >= 7) {

				longitude = lo;
				latitude  = la;
				height    = he;
				direction = dir;
				nick      = ni;
				tilt      = ti;
				focallength_sensor_ratio = fr;
				projection_type = pt;	

				ret = 2; // special return value for compatibility with
				         // old format

				break;
			}
		}

		fclose(p);
		waitpid(pid, &status, 0); 
		if (WEXITSTATUS(status) == 127 || WEXITSTATUS(status) == 126) {
			fprintf(stderr, "%s not found\n", args[0]);
		}
	}

	return ret;
}

int
JpgcomImageMetaData::save_image(char *in_img, char *out_img) {
	char * args[32];
	FILE *p, *out;
	pid_t pid;
	char buf[1024];
	int status;
	size_t n;
	struct stat in_stat, out_stat;

	if (stat(in_img, &in_stat) != 0) {
		perror("stat");
		return 1;
	}

	if (stat(out_img, &out_stat) == 0) {
		if (in_stat.st_ino == out_stat.st_ino) {
			fprintf(stderr, "Input image %s and output image %s are the same file\n",
				in_img, out_img);
			return 1;
		}
	}

	out = fopen(out_img, "w");
	if (out == NULL) {
		perror("fopen");
		return 1;
	}

	snprintf(buf, sizeof(buf), GIPFEL_FORMAT_2,
		longitude,
		latitude,
		height,
		direction,
		nick,
		tilt,
		focallength_sensor_ratio,
		projection_type);

	// try to save gipfel data in JPEG comment section
	args[0] = "wrjpgcom";
	args[1] = "-replace";
	args[2] = "-comment";
	args[3] = buf;
	args[4] = in_img;
	args[5] = NULL;

	p = pexecvp(args[0], args, &pid, "r");

	if (p) {
		while ((n = fread(buf, 1, sizeof(buf), p)) != 0) {
			if (fwrite(buf, 1, n, out) != n) {
				perror("fwrite");
				fclose(out);
				fclose(p);
				waitpid(pid, &status, 0);
			}
		}
		fclose(p);
		waitpid(pid, &status, 0);
		if (WEXITSTATUS(status) == 127 || WEXITSTATUS(status) == 126) {
			fprintf(stderr, "%s not found\n", args[0]);
		}
	}

	fclose(out);
	return 0;
}