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/* wydawca - automatic release submission daemon
   Copyright (C) 2007-2013 Sergey Poznyakoff

   Wydawca 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 3 of the License, or (at your
   option) any later version.

   Wydawca 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 General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with wydawca. If not, see <http://www.gnu.org/licenses/>. */

#include "wydawca.h"
#include "sql.h"

static const char *
meta_expand(struct wy_metadef *def, void *data)
{
	if (!def->value) {
		if (def->expand)
			return def->expand(def, data);
		def->value = "INTERNAL ERROR: NONEXPANDABLE DATA";
	}
	return def->value;
}

static const char *
find_expansion_char(int c, struct wy_metadef *def, void *data)
{
	for (; def->kw; def++)
		if (def->kw[1] == 0 && def->kw[0] == c)
			return meta_expand(def, data);
	return NULL;
}

static const char *
find_expansion_word(const char *kw, size_t len, struct wy_metadef *def,
		    void *data)
{
	for (; def->kw; def++)
		if (strlen(def->kw) == len && memcmp(def->kw, kw, len) == 0)
			return meta_expand(def, data);
	return NULL;
}

char *
meta_expand_string(const char *string, struct wy_metadef *def, void *data,
		   struct dictionary *dict, void *handle)
{
	const char *p, *s;
	char *res;
	struct txtacc *acc;

	if (!string)
		return NULL;

	acc = txtacc_create();

	for (p = string; *p;) {
		char *e;
		size_t len = strcspn(p, "$");

		txtacc_grow(acc, p, len);
		p += len;
		if (*p == '$') {
			switch (*++p) {
			case '$':
				txtacc_grow(acc, p, 1);
				p++;
				break;

			case '-':
				if (*++p)
					p++;
				break;

			case '{':
				e = strchr(p + 1, '}');
				if (e &&
				    (s = find_expansion_word(p + 1, e - p - 1,
							     def, data))) {
					if (dict) {
						char *newval;
						size_t len;
						/* FIXME: Return value? */
						dictionary_quote_string(dict,
									handle,
									s,
									&newval,
									&len);
						txtacc_grow(acc, newval, len);
						free(newval);
					} else
						txtacc_grow(acc, s, strlen(s));
					p = e + 1;
				} else {
					txtacc_grow(acc, p - 1, 2);
					p++;
				}
				break;

			default:
				if ((s = find_expansion_char(*p, def, data))
				    != NULL)
					len = strlen(s);
				else {
					s = p - 1;
					len = 1;
				}

				if (dict) {
					char *newval;
					size_t len;
					/* FIXME: Return value? */
					dictionary_quote_string(dict,
								handle, s,
								&newval, &len);
					txtacc_grow(acc, newval, len);
					free(newval);
				} else
					txtacc_grow(acc, s, len);
				p++;
			}
		} else
			txtacc_grow(acc, p, 1);
	}
	txtacc_1grow(acc, 0);
	res = txtacc_finish(acc, 1);
	txtacc_free(acc);
	return res;
}

void
meta_free(struct wy_metadef *def)
{
	for (; def->kw; def++) {
		if (def->storage) {
			free(def->storage);
			def->value = def->storage = NULL;
		}
	}
}

struct wy_metadef *
metadef_join(struct wy_metadef *a, struct wy_metadef *b)
{
	struct wy_metadef *np;
	size_t i, j;

	for (i = 0; a[i].kw; i++);
	if (b)
		for (j = 0; b[j].kw; j++);
	else
		j = 0;
	np = grecs_malloc((i + j + 1) * sizeof(a[0]));
	memcpy(np, a, i * sizeof(a[0]));
	if (j > 0)
		memcpy(np + i, b, j * sizeof(b[0]));
	np[i + j].kw = NULL;
	return np;
}

char *
wy_expand_stats(const char *tmpl)
{
	struct wy_metadef *exp;
	time_t t;
	size_t tc;
	char *text;
	
	tc = timer_get_count() * 3;
	exp = make_stat_expansion(tc + 1);
	time(&t);
	exp[0].kw = "date";
	exp[0].value = exp[0].storage = grecs_strdup(ctime(&t));
	exp[0].value[strlen(exp[0].value) - 1] = 0;
	timer_fill_meta(exp + 1, tc);
	text = meta_expand_string(tmpl, exp, NULL, NULL, NULL);
	meta_free(exp);
	timer_free_meta(exp + 1, tc);
	free(exp);

	return text;
}

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