#include "config.h"

#include <assert.h>
#include <errno.h>
#include <nl_types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "logerr.h"

#include "catalog.h"

static const char *const
CATALOG_NAME = NAME;

static nl_catd
catalog_descriptor = NULL;

static const char *const
NLSPATH = LOCALEDIR "/%l_%t/LC_MESSAGES/%N.cat" ":"
	LOCALEDIR "/%l/LC_MESSAGES/%N.cat";

static const char *const
NLSPATH_KEY = "NLSPATH";


int
i18n_init(void) {
	int rc = -1;

	static const int should_overwrite = 0;
	if (setenv(NLSPATH_KEY, NLSPATH, should_overwrite)) {
		logerr("setenv(\"%s\", \"%s\", 0): %s\n", NLSPATH_KEY,
			NLSPATH, strerror(errno));
		goto out;
	}

	catalog_descriptor = catopen(CATALOG_NAME, 0);
	if (catalog_descriptor != NULL && catalog_descriptor == (nl_catd)-1) {
		logerr("catopen(\"%s\", 0): %s\n", CATALOG_NAME, strerror(errno));
		catalog_descriptor = NULL;
		goto out;
	}

	rc = 0;
out:
	return rc;
}

int
i18n_destroy(void) {
	int rc = -1;

	if (catalog_descriptor != NULL) {
		if (catclose(catalog_descriptor)) {
			logerr("catclose(...): %s\n", strerror(errno));
			goto out;
		}
	}

	rc = 0;
out:
	if (catalog_descriptor != NULL) {
		catalog_descriptor = NULL;
	}
	return rc;
}

/**
 * Infallible: always returns a valid string, no matter what.
 */
const char *
s(const char* const MSGS[], const int msg_id) {
	assert(msg_id > 0);
	// FIXME: assert within bounds!
	// printf("sizeof(MSGS): %ld\n", sizeof(MSGS));
	if (catalog_descriptor == NULL) {
		return MSGS[msg_id];
	}

	errno = 0;
	const char *const ret =
		catgets(catalog_descriptor, NL_SETD, msg_id, MSGS[msg_id]);
	if (errno) {
		logerr("catgets(%d): %s\n", msg_id, strerror(errno));
	}

	return ret;
}

int
s_print_msgs(
	const char *const MSGS[],
	FILE *restrict stream,
	const int msg_begin,
	const int msg_end
) {
	int rc = -1;

	for (int i = msg_begin; i <= msg_end; i++) {
		if (fprintf(stream, "%s", s(MSGS, i)) < 0) {
			logerr("fprintf(stream, \"%%s\", _(%d)): %s\n", i,
				strerror(errno));
			goto out;
		}
	}

	rc = 0;
out:
	return rc;
}

int
s_print_msg(const char *const MSGS[], FILE *const fd, const int msg_id) {
	return s_print_msgs(MSGS, fd, msg_id, msg_id);
}

int
dump_translatable_strings(const char *const MSGS[]) {
	int rc = -1;

	for (size_t i = 1; MSGS[i]; i++) {
		if (printf("%ld ", i) < 0) {
			logerr("printf(\"%%ld\", %d): %s\n", i);
			goto out;
		}

		for (size_t j = 0; MSGS[i][j]; j++) {
			if (MSGS[i][j] == '\n') {
				if (printf("\\n") < 0) {
					logerr("printf(\"\\\\n\"): %s\n",
						strerror(errno));
					goto out;
				}
			} else {
				if (printf("%c", MSGS[i][j]) < 0) {
					logerr("printf(\"%%c\", "
						"MSGS[%ld][%ld]): %s\n",
						i, j, strerror(errno));
					goto out;
				}
			}
		}

		if (printf("\n\n") < 0) {
			logerr("printf(\"\\n\\n\"): %s\n", strerror(errno));
			goto out;
		}
	}

	rc = 0;
out:
	return rc;
}