/* Copyright (c) 2015-2017 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "str.h"
#include "fts-language.h"
#include "fts-filter-private.h"

#ifdef HAVE_LIBICU
#  include "fts-icu.h"
#  include "fts-filter-common.h"
#endif

static int
fts_filter_lowercase_create(const struct fts_language *lang ATTR_UNUSED,
                            const char *const *settings,
                            struct fts_filter **filter_r,
                            const char **error_r)
{
	struct fts_filter *filter;
	unsigned int i, max_length = 250;

	for (i = 0; settings[i] != NULL; i += 2) {
		const char *key = settings[i], *value = settings[i+1];

		if (strcmp(key, "maxlen") == 0) {
			if (str_to_uint(value, &max_length) < 0 ||
			    max_length == 0) {
				*error_r = t_strdup_printf("Invalid lowercase filter maxlen setting: %s", value);
				return -1;
			}
		}
		else {
			*error_r = t_strdup_printf("Unknown setting: %s", key);
			return -1;
		}
	}
	filter = i_new(struct fts_filter, 1);
	*filter = *fts_filter_lowercase;
	filter->token = str_new(default_pool, 64);
	filter->max_length = max_length;

	*filter_r = filter;
	return 0;
}

static int
fts_filter_lowercase_filter(struct fts_filter *filter ATTR_UNUSED,
                            const char **token,
                            const char **error_r ATTR_UNUSED)
{
#ifdef HAVE_LIBICU
	str_truncate(filter->token, 0);
	fts_icu_lcase(filter->token, *token);
	fts_filter_truncate_token(filter->token, filter->max_length);
	*token = str_c(filter->token);
#else
	*token = t_str_lcase(*token);
#endif
	return 1;
}

static const struct fts_filter fts_filter_lowercase_real = {
	.class_name = "lowercase",
	.v = {
		fts_filter_lowercase_create,
		fts_filter_lowercase_filter,
		NULL
	}
};

const struct fts_filter *fts_filter_lowercase = &fts_filter_lowercase_real;