#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include "config.h"
#include "macros.h"
#include "misc.h"

void cleanup_config(config *conf) {
	for (int i = 0; config_keywords[i] != NULL; ++i) {
		/* Get the pointer to the config option. */
		void *cfg = get_keyword_offset_ptr(config_keywords[i], conf);
		/* Is this config option's type a string, and is the string of that config option in conf not NULL? */
		if (config_keywords[i]->type == TYPE_STRING && *(void **)cfg != NULL) {
			free(*(void **)cfg);
		}
	}
	free(conf);
}

int check_port(void *ctx, void *ret, const keyword *key, keyword_val val) {
	if (key->type == TYPE_STRING) {
		int port = strtol(val.str, NULL, 0);
		if (port > 0 || port <= 65535) {
			return 0;
		} else {
			log(LOG_ERR, "Invalid port %d. (Valid port must be between 1, and 65535.)", port);
		}
	} else {
		log(LOG_ERR, "Keyword \"%s\" doesn't return a string.", key->key);
	}
	return -1;
}

config *parse_config(const char *filename) {
	/* Size of the file, in bytes. */
	long filesize = 0;
	/* Config settings. */
	config *cfg;
	/* Buffer of the file contents. */
	char *buf = read_file(filename, &filesize);
	char *tmp = buf;

	/* Return NULL, if the buffer wasn't allocated */
	if (buf == NULL) {
		return NULL;
	}

	cfg = calloc(1, sizeof(config));

	/* Return NULL, if cfg wasn't allocated. */
	if (cfg == NULL) {
		free(buf);
		return NULL;
	}

	while (*tmp != '\0') {
		char *line = get_line(&tmp);
		char *value;
		char *name = strtok_r(line, "=", &value);
		int error;

		/* Did we fail to parse the config option? */
		if (error = parse_keywords(config_keywords, name, value, cfg, NULL)) {
			if (error == 5) {
				cleanup_config(cfg);
				free(line);
				free(buf);
				return NULL;
			} else {
				log(LOG_WARNING, "Failed to parse config option \"%s\". Error code: %i", name, error);
			}
		}

		free(line);
	}

	free(buf);
	return cfg;
}