#define _XOPEN_SOURCE
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include "keyword.h"
#include "macros.h"
#include "misc.h"

void *get_keyword_offset_ptr(const keyword *key, void *ptr) {
	char *ret = (char *)(ptr+key->offsets[0]);
	for (int i = 1; (int64_t)key->offsets[i] >= 0; ++i) {
		ret = *(char **)(ret+key->offsets[i]);
	}
	return (void *)ret;
}

keyword_val get_keyword_value(const keyword *key, char *value, int *error) {
	keyword_val val = {0};
	int dummy = 0;
	error = (error != NULL) ? error : &dummy;
	*error = 0;

	switch (key->type) {
		case TYPE_INT	:
		case TYPE_BOOL	: val.i = strtol(value, NULL, 0); break;
		case TYPE_TIME	:
			if (key->time_fmt != NULL) {
				struct tm tm = {0};
				if (strptime(value, key->time_fmt, &tm) != NULL) {
					tm.tm_isdst = -1;
					val.t = mktime(&tm);
				} else {
					*error = 3;
				}
			} else {
				*error = 4;
			}
			break;
		case TYPE_STRING: val.str = make_str(value); break;
		case TYPE_FLOAT	: val.f = strtof(value, NULL); break;
		default		: *error = 2; break;
	}
	return val;
}

int set_keyword(const keyword *key, keyword_val val, void *ret, void *ctx) {
	const int callback_ret = (key->callback != NULL) ? key->callback(ctx, ret, key, val) : 0;
	if (callback_ret < 0 || callback_ret > 0) {
		return (callback_ret > 0) ? 0 : 5;
	} else {
		char *tmp_ret = (char *)get_keyword_offset_ptr(key, ret);

		switch (key->type) {
			case TYPE_INT	:
			case TYPE_BOOL	: *(int *)tmp_ret = val.i; break;
			case TYPE_TIME	: *(time_t *)tmp_ret = val.t; break;
			case TYPE_STRING: *(char **)tmp_ret = val.str; break;
			case TYPE_FLOAT	: *(float *)tmp_ret = val.f; break;
			default		: return 6; break;
		}
		return 0;
	}
}

keyword_val parse_keyword(const keyword *key, char *key_str, char *value, int *error) {
	int dummy = 0;
	error = (error != NULL) ? error : &dummy;
	if (!strcmp(key->key, key_str)) {
		return get_keyword_value(key, value, error);
	} else {
		*error = 1;
		return (keyword_val){0};
	}
}


int parse_keywords(const keyword **keys, char *key, char *value, void *ret, void *ctx) {
	keyword_val val = {0};
	int error = 0;

	for (int i = 0; keys[i] != NULL; ++i) {
		val = parse_keyword(keys[i], key, value, &error);

		if (!error) {
			return set_keyword(keys[i], val, ret, ctx);
		}
	}
	return error;
}

int parse_key_value_file(void *ret, void *ctx, const keyword **keywords, char *buf, const char *delm, parse_callback *parse_cb) {
	if (buf != NULL) {
		int ret_val = 0;
		for (;;) {
			char *lhs, *rhs;
			/* Find the keyword before the delimiter(s). */
			lhs = strtok_r(skip_whitespace(buf), delm, &buf);
			/* Remove any whitespace ahead of us. */
			lhs = strtok_r(lhs, " \t\v\r\n", &rhs);

			/* Did we hit EOF? */
			if (is_empty(lhs) || is_empty(buf)) {
				break;
			} else {
				int error;
				char *tmp = skip_whitespace(buf);

				/* Does the right hand side start with a double, or single quote? */
				if (*tmp == '\"' || *tmp == '\'') {
					const char *delm = (*tmp == '\"') ? "\"" : "\'";
					/* Get the string in between the start, and end qoute. */
					rhs = get_str_delm_range(tmp, delm, delm, &buf);
				} else {
					/* Get the rest of the line. */
					rhs = strtok_r(tmp, "\n", &buf);
				}

				/* Did we fail to parse the keyword? */
				if (error = parse_keywords(keywords, lhs, rhs, ret, ctx)) {
					log(LOG_WARNING, "Failed to parse keyword \"%s\". Error code: %i", lhs, error);
					ret_val = error;
				}
			}

			/* Do we have a parse callback? */
			if (parse_cb != NULL) {
				/* Did the callback return an error. */
				if (parse_cb(&ret, ctx, buf) < 0) {
					ret_val = 7;
					break;
				}
			}
		}
		return ret_val;
	} else {
		return 8;
	}
}