/*
 * Copyright(c) 2014 Tim Ruehsen
 *
 * This file is part of libpsl.
 *
 * Libpsl 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.
 *
 * Libpsl 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 libpsl.  If not, see <http://www.gnu.org/licenses/>.
 *
 *
 * Precompile Public Suffix List into
 *
 * Changelog
 * 22.03.2014  Tim Ruehsen  created
 *
 */

#if HAVE_CONFIG_H
# include <config.h>
#endif

#include <stdio.h>
#include <time.h>
#include <sys/stat.h>

//#ifdef WITH_LIBIDN2
#	include <idn2.h>
//#endif

#include "psl.c"

static void _print_psl_entries(FILE *fpout, const _psl_vector_t *v, const char *varname)
{
	int it;

	fprintf(fpout, "// automatically generated by psl2c\n");
	fprintf(fpout, "static _psl_entry_t %s[] = {\n", varname);

	for (it = 0; it < v->cur; it++) {
		_psl_entry_t *e = _vector_get(v, it);

		fprintf(fpout, "\t{ \"%s\", NULL, %hd, %hhd, %hhd },\n",
			e->label_buf, e->length, e->nlabels, e->wildcard);
	}

	fprintf(fpout, "};\n");
}

static int _str_needs_encoding(const char *s)
{
	while (*s > 0) s++;

	return !!*s;
}

static void _add_punycode_if_needed(_psl_vector_t *v)
{
	int it;

	for (it = 0; it < v->cur; it++) {
		_psl_entry_t *e = _vector_get(v, it);

		if (_str_needs_encoding(e->label_buf)) {
			_psl_entry_t suffix;
			char *asc = NULL;
			int rc;

			if ((rc = idn2_lookup_u8((uint8_t *)e->label_buf, (uint8_t **)&asc, 0)) == IDN2_OK) {
				// fprintf(stderr, "idn2 '%s' -> '%s'\n", e->label_buf, asc);
				_suffix_init(&suffix, asc, strlen(asc));
				suffix.wildcard = e->wildcard;
				_vector_add(v, &suffix);
			} else
				fprintf(stderr, "toASCII(%s) failed (%d): %s\n", e->label_buf, rc, idn2_strerror(rc));
		}
	}

	_vector_sort(v);
}

int main(int argc, const char **argv)
{
	FILE *fpout;
	psl_ctx_t *psl;
	int ret = 0;

	if (argc != 3) {
		fprintf(stderr, "Usage: psl2c <infile> <outfile>\n");
		fprintf(stderr, "  <infile>  is the 'effective_tld_names.dat' (aka Public Suffix List)\n");
		fprintf(stderr, "  <outfile> is the the C filename to be generated from <infile>\n");
		return 1;
	}

	if (!(psl = psl_load_file(argv[1])))
		return 2;

	if ((fpout = fopen(argv[2], "w"))) {
		FILE *pp;
		struct stat st;
		char cmd[16 + strlen(argv[1])], checksum[64] = "";

		_add_punycode_if_needed(psl->suffixes);
		_add_punycode_if_needed(psl->suffix_exceptions);

		_print_psl_entries(fpout, psl->suffixes, "suffixes");
		_print_psl_entries(fpout, psl->suffix_exceptions, "suffix_exceptions");

		snprintf(cmd, sizeof(cmd), "sha1sum %s", argv[1]);
		if ((pp = popen(cmd, "r"))) {
			if (fscanf(pp, "%63[0-9a-zA-Z]", checksum) < 1)
				*checksum = 0;
			pclose(pp);
		}

		if (stat(argv[1], &st) != 0)
			st.st_mtime = 0;
		fprintf(fpout, "static time_t _psl_file_time = %lu;\n", st.st_mtime);
		fprintf(fpout, "static time_t _psl_compile_time = %lu;\n", time(NULL));
		fprintf(fpout, "static char _psl_sha1_checksum[] = \"%s\";\n", checksum);

		if (fclose(fpout) != 0)
			ret = 4;
	} else {
		fprintf(stderr, "Failed to write open '%s'\n", argv[2]);
		ret = 3;
	}

	psl_free(&psl);
	return ret;
}