/*
 * pdf.c - Generate PDF
 *
 * Copyright 2012 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.
 */

#define	_GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>

#include "comp.h"
#include "pdf.h"


static int children(const struct node *node)
{
	int n = 0;

	while (node) {
		n++;
		node = node->next;
	}
	return n;
}


static void ps_string(FILE *file, const char *s)
{
	fputc('(', file);
	while (*s) {
		if (*s == '(' || *s == ')' || *s == '\\')
			fputc('\\', file);
		fputc(*s, file);
		s++;
	}
	fputc(')', file);
}


static void print_path(FILE *file, const struct node *node)
{
	if (node->parent) {
		print_path(file, node->parent);
		fprintf(file, "( > ) show\n");
	}
	ps_string(file, node->name);
	fprintf(file, " 0.5 setgray show 0 setgray\n");
}


static void make_title(FILE *file, const struct node *node, int unit)
{
	fprintf(file, "gsave 90 rotate 0 setgray\n"
	    "/Helvetica-Bold findfont 24 scalefont setfont\n"
	    "20 -57 moveto\n");
	ps_string(file, node->canon);
	fprintf(file, " show\n");
	if (node->units > 1)
		fprintf(file, " ( \\(%c\\)) show\n", 'A'+unit);

	fprintf(file, "/Hevetica-Bold findfont 18 scalefont setfont\n");
	fprintf(file, "20 -30 moveto\n");
	print_path(file, node);

	fprintf(file, "/Courier findfont 12 scalefont setfont\n");
	fprintf(file, "20 -75 moveto\n");
	ps_string(file, node->lib);
	fprintf(file, " show\n");

	fprintf(file, "grestore\n");
	fflush(file);
}


static void convert_comp(const struct node *node, FILE *out)
{
	char *tmp;
	int i, res;

	for (i = 0; i != node->units; i++) {
		make_title(stdout, node, i);
		if (asprintf(&tmp, "./sym2xps '%s' '%s' %d '%s' '%s'", 
		    node->lib, node->canon, i+1, "tmp", "tmp.ps") < 0) {
			perror("asprintf");
			exit(1);
		}
		res = system(tmp);
		if (res < 0) {
			perror("system");
			exit(1);
		}
		if (res) {
			fprintf(stderr, "sym2xps returned %d\n", res);
			exit(1);
		}
		fflush(out);
		system("cat tmp.ps");
	}
}


static void convert_tree(const struct node *node, FILE *out)
{
	while (node) {
		fprintf(out, "[ /Title (%s) /Count %d /OUT pdfmark\n",
		    node->name, -children(node->child));
		if (node->child)
			convert_tree(node->child, out);
		else
			convert_comp(node, out);
		node = node->next;
	}
}


void make_pdf(void)
{
	FILE *out;
	int res;

#if 0
	out = popen(
	    "gs -q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=- -f -",
	    "w");
#else
	out = popen("cat", "w");
#endif
	if (!out) {
		perror("gs");
		exit(1);
	}
	convert_tree(tree, out);
	res = pclose(out);
	if (res < 0) {
		perror("pclose");
		exit(1);
	}
	if (res) {
		fprintf(stderr, "exit status %d\n", res);
		exit(1);
	}
}