/*
 * 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 <sys/types.h>

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


static struct format {
	const char *file_setup;
	const char *overlay_setup;
	const char *comp_setup;
	int left;
	struct text {
		const char *font;
		int size;
		int y;
	} name, path, lib, comment;
	int comment_line_skip;
} landscape = {
	.file_setup	= "%%Orientation: Landscape",
	.overlay_setup	= "90 rotate",
	.comp_setup	= "",
	.left		= 20,
	.name		= { "Helvetica-Bold",	24,  57 },
	.path		= { "Helvetica-Bold",	18,  30 },
	.lib		= { "Courier",		12,  75 },
	.comment	= { "Helvetica",	12, 600 },
	.comment_line_skip = 14,
}, portrait = {
	.file_setup	= "%%Orientation: Portrait",
	.overlay_setup	= "0 790 translate",
	.comp_setup	= "-120 700 translate -90 rotate",
	.left		= 20,
	.name		= { "Helvetica-Bold",	24,  57 },
	.path		= { "Helvetica-Bold",	18,  30 },
	.lib		= { "Courier",		12,  75 },
	.comment	= { "Helvetica",	12, 740 },
	.comment_line_skip = 14,
}, format;


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 %s 0 setgray\n", format.overlay_setup);

	fprintf(file, "/%s findfont %d scalefont setfont\n",
	    format.name.font, format.name.size);
	fprintf(file, "%d %d moveto\n", format.left, -format.name.y);
	ps_string(file, node->canon);
	fprintf(file, " show\n");
	if (node->units > 1)
		fprintf(file, " ( \\(%c\\)) show\n", 'A'+unit);

	fprintf(file, "/%s findfont %d scalefont setfont\n",
	    format.path.font, format.path.size);
	fprintf(file, "%d %d moveto\n", format.left, -format.path.y);
	print_path(file, node);

	fprintf(file, "/%s findfont %d scalefont setfont\n",
	    format.lib.font, format.lib.size);
	fprintf(file, "%d %d moveto\n", format.left, -format.lib.y);
	ps_string(file, node->lib);
	fprintf(file, " show\n");

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


static void print_comment(FILE *file, const struct line *comment)
{
	const struct line *line;
	int lines = 0;
	int n;

	fprintf(file, "gsave %s 0 setgray\n", format.overlay_setup);
	fprintf(file, "/%s findfont %d scalefont setfont\n",
	    format.comment.font, format.comment.size);
	for (line = comment; line; line = line->next)
		lines++;
	n = 0;
	for (line = comment; line; line = line->next) {
		n++;
		fprintf(file, "%d -%d moveto\n", format.left,
		    format.comment.y+(n-lines)*format.comment_line_skip);
		ps_string(file, line->s);
		fprintf(file, " show\n");
	}
	fprintf(file, "grestore\n");
}


static void cat(FILE *out, const char *name)
{
	FILE *in;
	char buf[10000]; /* pick any good size */
	size_t got, wrote;

	in = fopen(name, "r");
	if (!in) {
		perror(name);
		exit(1);
	}
	while (1) {
		got = fread(buf, 1, sizeof(buf), in);
		if (!got)
			break;
		wrote = fwrite(buf, 1, got, out);
		if (wrote != got) {
			perror("fwrite");
			exit(1);
		}
	}
	if (ferror(in)) {
		perror(name);
		exit(1);
	}
	fclose(in);
}


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

	for (i = 0; i != node->units; i++) {
		make_title(out, node, i);
		if (!i && node->comment)
			print_comment(out, node->comment);
		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);
		}
		fprintf(out, "gsave %s\n", format.comp_setup);
		cat(out, "tmp.ps");
		fprintf(out, "\ngrestore\n");
	}
}


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(int pdf, int use_portrait)
{
	FILE *out;
	int res;

	if (use_portrait)
		format = portrait;
	else
		format = landscape;
	if (pdf)
		out = popen(
		    "gs -q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=- "
		      "-f -", "w");
	else
		out = popen("cat", "w");
	if (!out) {
		perror("gs");
		exit(1);
	}
	fprintf(out, "%%!PS\n%s\n", format.file_setup);
	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);
	}
}