/*
 * face.c - Data structure and handling of one face of a part
 *
 * Written 2010 by Werner Almesberger
 * Copyright 2010 by Werner Almesberger
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */


#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <math.h>
#include <fcntl.h>
#include <sys/wait.h>

#include "util.h"
#include "array.h"
#include "histo.h"
#include "face.h"


#define	CACHE_DIR	".cache"


static struct face *read_file(const char *name)
{
	FILE *file;
	struct face *f;
	struct histo *h;
	float x, y, z;
	int xi, yi, zi;

	if (!strcmp(name, "-")) {
		file = stdin;
	} else {
		int len;

		len = strlen(name);
		if (len > 4 && !strcmp(name+len-4, ".bz2")) {
			char tmp[1000]; /* @@@ enough */

			sprintf(tmp, "bzcat \"%s\"", name);
			file = popen(tmp, "r");
			if (!file) {
				perror(tmp);
				exit(1);
			}
		} else {
			file = fopen(name, "r");
			if (!file) {
				perror(name);
				exit(1);
			}
		}
	}
	f = alloc_type(struct face);
	f->a = new_array();

	while (fscanf(file, "%f,%f,%f\r\n", &x, &y, &z) == 3) {
		/* @@@ hack - should auto-scale */
		xi = round(x*10.0);
		yi = round(y*10.0);
		zi = round(z*40.0);
		set(f->a, xi, yi, zi);
	}
	if (file != stdin)
		(void) fclose(file);

	f->sx = f->a->max_x-f->a->min_x+1;
	f->sy = f->a->max_y-f->a->min_y+1;

	f->cx = (f->a->min_x+f->a->max_x)/2;
	f->cy = (f->a->min_y+f->a->max_y)/2;

	h = make_histo(f->a);
	f->z_ref = f->a->min_z+median(h);
	free_histo(h);
	f->fx = f->fy = 0;

	f->m.a[0][0] = f->m.a[1][1] = 1;
	f->m.a[0][1] = f->m.a[1][0] = 0;
	f->m.b[0] = f->m.b[1] = 0;

	fprintf(stderr, "%d-%d / %d-%d / %d-%d\n",
	    f->a->min_x, f->a->max_x, f->a->min_y, f->a->max_y,
	    f->a->min_z, f->a->max_z);

	return f;
}


struct face *read_face(const char *name)
{
	const char *p;
	int cwd;
	struct face *face;

	if (strncmp(name, "http:", 5) && strncmp(name, "https:", 6))
		return read_file(name);
	p = strrchr(name, '/');
	if (!p || !p[1]) {
		fprintf(stderr, "malformed URL: \"%s\"\n", name);
		exit(1);
	}
	cwd = open(".", O_RDONLY);
	if (cwd < 0) {
		perror(".");
		exit(1);
	}
	if (chdir(CACHE_DIR) < 0) {
		perror(CACHE_DIR);
		exit(1);
	}
	if (access(p+1, R_OK) < 0) {
		char tmp[1000]; /* @@@ enough */
		int res;

		sprintf(tmp, "wget '%s'", name);
		res = system(tmp);
		if (res < 0) {
			perror("system");
			exit(1);
		}
		if (!WIFEXITED(res) || WEXITSTATUS(res)) {
			fprintf(stderr, "%s: status %d\n", tmp, res);
			exit(1);
		}
	}
	face = read_file(p+1);
	if (fchdir(cwd) < 0) {
		perror("fchdir");
		exit(1);
	}
	return face;
}