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/*
 * Copyright (c) 2018 Nordic Semiconductor ASA
 * Copyright (c) 2015 Runtime Inc
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdbool.h>
#include <errno.h>
#include <kernel.h>

#include "settings/settings.h"
#include "settings_priv.h"
#include <zephyr/types.h>

#include <logging/log.h>
LOG_MODULE_REGISTER(settings, CONFIG_SETTINGS_LOG_LEVEL);

#if defined(CONFIG_SETTINGS_DYNAMIC_HANDLERS)
sys_slist_t settings_handlers;
#endif /* CONFIG_SETTINGS_DYNAMIC_HANDLERS */

K_MUTEX_DEFINE(settings_lock);


void settings_store_init(void);

void settings_init(void)
{
#if defined(CONFIG_SETTINGS_DYNAMIC_HANDLERS)
	sys_slist_init(&settings_handlers);
#endif /* CONFIG_SETTINGS_DYNAMIC_HANDLERS */
	settings_store_init();
}

#if defined(CONFIG_SETTINGS_DYNAMIC_HANDLERS)
int settings_register(struct settings_handler *handler)
{
	int rc;

	k_mutex_lock(&settings_lock, K_FOREVER);

	Z_STRUCT_SECTION_FOREACH(settings_handler_static, ch) {
		if (strcmp(handler->name, ch->name) == 0) {
			rc = -EEXIST;
			goto end;
		}
	}

	struct settings_handler *ch;
	SYS_SLIST_FOR_EACH_CONTAINER(&settings_handlers, ch, node) {
		if (strcmp(handler->name, ch->name) == 0) {
			rc = -EEXIST;
			goto end;
		}
	}
	sys_slist_append(&settings_handlers, &handler->node);
	rc = 0;
end:
	k_mutex_unlock(&settings_lock);
	return rc;
}
#endif /* CONFIG_SETTINGS_DYNAMIC_HANDLERS */

int settings_name_steq(const char *name, const char *key, const char **next)
{
	if (next) {
		*next = NULL;
	}

	if ((!name) || (!key)) {
		return 0;
	}

	/* name might come from flash directly, in flash the name would end
	 * with '=' or '\0' depending how storage is done. Flash reading is
	 * limited to what can be read
	 */

	while ((*key != '\0') && (*key == *name) &&
	       (*name != '\0') && (*name != SETTINGS_NAME_END)) {
		key++;
		name++;
	}

	if (*key != '\0') {
		return 0;
	}

	if (*name == SETTINGS_NAME_SEPARATOR) {
		if (next) {
			*next = name + 1;
		}
		return 1;
	}

	if ((*name == SETTINGS_NAME_END) || (*name == '\0')) {
		return 1;
	}

	return 0;
}

int settings_name_next(const char *name, const char **next)
{
	int rc = 0;

	if (next) {
		*next = NULL;
	}

	if (!name) {
		return 0;
	}

	/* name might come from flash directly, in flash the name would end
	 * with '=' or '\0' depending how storage is done. Flash reading is
	 * limited to what can be read
	 */
	while ((*name != '\0') && (*name != SETTINGS_NAME_END) &&
	       (*name != SETTINGS_NAME_SEPARATOR)) {
		rc++;
		name++;
	}

	if (*name == SETTINGS_NAME_SEPARATOR) {
		if (next) {
			*next = name + 1;
		}
		return rc;
	}

	return rc;
}

struct settings_handler_static *settings_parse_and_lookup(const char *name,
							const char **next)
{
	struct settings_handler_static *bestmatch;
	const char *tmpnext;

	bestmatch = NULL;
	if (next) {
		*next = NULL;
	}

	Z_STRUCT_SECTION_FOREACH(settings_handler_static, ch) {
		if (!settings_name_steq(name, ch->name, &tmpnext)) {
			continue;
		}
		if (!bestmatch) {
			bestmatch = ch;
			if (next) {
				*next = tmpnext;
			}
			continue;
		}
		if (settings_name_steq(ch->name, bestmatch->name, NULL)) {
			bestmatch = ch;
			if (next) {
				*next = tmpnext;
			}
		}
	}

#if defined(CONFIG_SETTINGS_DYNAMIC_HANDLERS)
	struct settings_handler *ch;

	SYS_SLIST_FOR_EACH_CONTAINER(&settings_handlers, ch, node) {
		if (!settings_name_steq(name, ch->name, &tmpnext)) {
			continue;
		}
		if (!bestmatch) {
			bestmatch = (struct settings_handler_static *)ch;
			if (next) {
				*next = tmpnext;
			}
			continue;
		}
		if (settings_name_steq(ch->name, bestmatch->name, NULL)) {
			bestmatch = (struct settings_handler_static *)ch;
			if (next) {
				*next = tmpnext;
			}
		}
	}
#endif /* CONFIG_SETTINGS_DYNAMIC_HANDLERS */
	return bestmatch;
}

int settings_commit(void)
{
	return settings_commit_subtree(NULL);
}

int settings_commit_subtree(const char *subtree)
{
	int rc;
	int rc2;

	rc = 0;

	Z_STRUCT_SECTION_FOREACH(settings_handler_static, ch) {
		if (subtree && !settings_name_steq(ch->name, subtree, NULL)) {
			continue;
		}
		if (ch->h_commit) {
			rc2 = ch->h_commit();
			if (!rc) {
				rc = rc2;
			}
		}
	}

#if defined(CONFIG_SETTINGS_DYNAMIC_HANDLERS)
	struct settings_handler *ch;
	SYS_SLIST_FOR_EACH_CONTAINER(&settings_handlers, ch, node) {
		if (subtree && !settings_name_steq(ch->name, subtree, NULL)) {
			continue;
		}
		if (ch->h_commit) {
			rc2 = ch->h_commit();
			if (!rc) {
				rc = rc2;
			}
		}
	}
#endif /* CONFIG_SETTINGS_DYNAMIC_HANDLERS */

	return rc;
}