#include <cjson/cJSON.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "msg.h"

int unmarshal_button_msg(const char *str, struct button_msg *msg)
{
	int status;
	cJSON *json, *device_id;

	if (!(json = cJSON_ParseWithLength(str, strlen(str)))) {
          warnx("error parsing json at char number %d from %s",
                (int)(cJSON_GetErrorPtr() - str), str);
	  status = -1;
	  goto end;
        }

	device_id = cJSON_GetObjectItemCaseSensitive(json, "device_id");
	if (!cJSON_IsString(device_id) || !device_id->valuestring)
		goto invalid_data;

	if (strlen(device_id->valuestring) != 64)
		goto invalid_data;

	memcpy(msg->id, device_id->valuestring, 65);

	status = 0;
	goto end;

invalid_data:
	warnx("error: invalid data");
	status = -1;
end:
	cJSON_Delete(json);
	return status;
}

int unmarshal_brightness_msg(const char *str, struct brightness_msg *msg)
{
	int status;
	cJSON *json, *device_id, *val;

	if (!(json = cJSON_ParseWithLength(str, strlen(str)))) {
          warnx("error parsing json at char number %d from %s",
                (int)(cJSON_GetErrorPtr() - str), str);
	  status = -1;
	  goto end;
        }

	device_id = cJSON_GetObjectItemCaseSensitive(json, "device_id");
	if (!cJSON_IsString(device_id) || !device_id->valuestring)
		goto invalid_data;

	val = cJSON_GetObjectItemCaseSensitive(json, "val");
	if (!cJSON_IsNumber(val))
		goto invalid_data;

	if (strlen(device_id->valuestring) != 64)
		goto invalid_data;

	memcpy(msg->id, device_id->valuestring, 65);
	msg->val = val->valueint;

	status = 0;
	goto end;

invalid_data:
	warnx("error: invalid data");
	status = -1;
end:
	cJSON_Delete(json);
	return status;
}