/*
 * Copyright (c) 2015 - 2016 Samsung Electronics Co., Ltd All Rights Reserved
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#ifndef __IOTCON_STRUCT_OPTIONS_H__
#define __IOTCON_STRUCT_OPTIONS_H__


#include <iotcon-types.h>


/**
 * @file iotcon-options.h
 */


/**
 * @ingroup CAPI_IOT_CONNECTIVITY_COMMON_MODULE
 * @defgroup CAPI_IOT_CONNECTIVITY_COMMON_OPTIONS_MODULE Options
 * @brief IoTCon Options provides API to manage options.
 * @section CAPI_IOT_CONNECTIVITY_COMMON_OPTIONS_MODULE_HEADER Required Header
 *          \#include <iotcon.h>
 * @section CAPI_IOT_CONNECTIVITY_COMMON_OPTIONS_MODULE_OVERVIEW Overview
 *          The IoTcon options API provides methods for managing vendor specific options of coap packet. \n
 *          See more about coap packet in http://tools.ietf.org/html/rfc7252.
 * Example (Client side) :
 * @code
#include <iotcon.h>
...
static void _request_get_with_option(iotcon_remote_resource_h resource)
{
	int i;
	int ret;
	unsigned short opt_id = 3000;
	const char *opt_val = "12345";
	iotcon_options_h options = NULL;

	..
	ret = iotcon_options_create(&options);
	if (IOTCON_ERROR_NONE != ret)
		return;

	ret = iotcon_options_add(options, opt_id, opt_val);
	if (IOTCON_ERROR_NONE != ret) {
		iotcon_options_destroy(options);
		return;
	}

	ret = iotcon_remote_resource_set_options(resource, options);
	if (IOTCON_ERROR_NONE != ret) {
		iotcon_options_destroy(options);
		return;
	}

	ret = iotcon_remote_resource_get(resource, NULL, _on_get, NULL);
	if (IOTCON_ERROR_NONE != ret) {
		iotcon_options_destroy(options);
		return;
	}

	iotcon_options_destroy(options);
	...
}
 * @endcode
 *
 * Example (Server side) :
 * @code
#include <iotcon.h>
...
static bool _options_foreach(unsigned short id, const char *data, void *user_data)
{
	// handle options
	return IOTCON_FUNC_CONTINUE;
}

static void _request_handler(iotcon_resource_h resource, iotcon_request_h request,
		void *user_data)
{
	int ret;
	iotcon_options_h options;

	ret = iotcon_request_get_options(request, &options);
	if (IOTCON_ERROR_NONE == ret && options) {
		ret = iotcon_options_foreach(options, _options_foreach, NULL);
		if (IOTCON_ERROR_NONE != ret)
			return;
	}
	...
}

 * @endcode
 * @section CAPI_IOT_CONNECTIVITY_COMMON_OPTIONS_MODULE_FEATURE Related Features
 *          This API is related with the following features: \n
 *          - %http://tizen.org/feature/iot.ocf \n
 *          It is recommended to design feature related codes in your application for reliability. \n
 *          You can check if a device supports the related features for this API by using @ref CAPI_SYSTEM_SYSTEM_INFO_MODULE, thereby controlling the procedure of your application. \n
 *          To ensure your application is only running on the device with specific features, please define the features in your manifest file using the manifest editor in the SDK. \n
 *          More details on featuring your application can be found from <a href="https://docs.tizen.org/application/tizen-studio/native-tools/manifest-text-editor#feature-element"><b>Feature Element</b>.</a>
 * @{
 */


/**
 * @brief Creates a new option handle.
 * @since_tizen 3.0
 * @remarks You must destroy @a options by calling iotcon_options_destroy() if @a options is no longer needed.
 * @param[out] options A newly allocated option handle
 * @return @c 0 on success,
 *         otherwise a negative error value
 * @retval #IOTCON_ERROR_NONE Successful
 * @retval #IOTCON_ERROR_NOT_SUPPORTED Not supported
 * @retval #IOTCON_ERROR_OUT_OF_MEMORY Out of memory
 * @retval #IOTCON_ERROR_INVALID_PARAMETER Invalid parameter
 * @see iotcon_options_destroy()
 * @see iotcon_options_add()
 * @see iotcon_options_remove()
 * @see iotcon_options_lookup()
 */
int iotcon_options_create(iotcon_options_h *options);


/**
 * @brief Destroys an option handle.
 * @since_tizen 3.0
 * @param[in] options The handle of the options
 * @return @c 0 on success,
 *         otherwise a negative error value
 * @retval #IOTCON_ERROR_NONE Successful
 * @retval #IOTCON_ERROR_NOT_SUPPORTED Not supported
 * @retval #IOTCON_ERROR_INVALID_PARAMETER Invalid parameter
 * @see iotcon_options_create()
 * @see iotcon_options_add()
 * @see iotcon_options_remove()
 * @see iotcon_options_lookup()
 */
int iotcon_options_destroy(iotcon_options_h options);


/**
 * @brief Adds a new ID and a corresponding data into the options.
 * @since_tizen 3.0
 * @remarks iotcon_options_h can have up to 2 options. \n
 *          Option ID is always situated between 2048 and 3000. \n
 *          Length of option data is less than or equal to 15.
 * @param[in] options The handle of the options
 * @param[in] id The ID of the option to insert
 * @param[in] data The string data to insert into the options
 * @return @c 0 on success,
 *         otherwise a negative error value
 * @retval #IOTCON_ERROR_NONE Successful
 * @retval #IOTCON_ERROR_NOT_SUPPORTED Not supported
 * @retval #IOTCON_ERROR_OUT_OF_MEMORY Out of memory
 * @retval #IOTCON_ERROR_INVALID_PARAMETER Invalid parameter
 * @see iotcon_options_create()
 * @see iotcon_options_destroy()
 * @see iotcon_options_remove()
 * @see iotcon_options_lookup()
 */
int iotcon_options_add(iotcon_options_h options, unsigned short id, const char *data);


/**
 * @brief Removes the ID and its associated data from the options.
 * @since_tizen 3.0
 * @param[in] options The handle of the options
 * @param[in] id The ID of the option to delete
 * @return @c 0 on success,
 *         otherwise a negative error value
 * @retval #IOTCON_ERROR_NONE Successful
 * @retval #IOTCON_ERROR_NOT_SUPPORTED Not supported
 * @retval #IOTCON_ERROR_INVALID_PARAMETER Invalid parameter
 * @see iotcon_options_create()
 * @see iotcon_options_destroy()
 * @see iotcon_options_add()
 * @see iotcon_options_lookup()
 */
int iotcon_options_remove(iotcon_options_h options, unsigned short id);


/**
 * @brief Looks up data at the given ID from the options.
 * @since_tizen 3.0
 * @remarks @a data must not be released using free().
 * @param[in] options The handle of the options
 * @param[in] id The ID of the option to lookup
 * @param[out] data Found data from options
 * @return @c 0 on success,
 *         otherwise a negative error value
 * @retval #IOTCON_ERROR_NONE Successful
 * @retval #IOTCON_ERROR_NOT_SUPPORTED Not supported
 * @retval #IOTCON_ERROR_INVALID_PARAMETER Invalid parameter
 * @see iotcon_options_create()
 * @see iotcon_options_destroy()
 * @see iotcon_options_add()
 * @see iotcon_options_remove()
 */
int iotcon_options_lookup(iotcon_options_h options, unsigned short id, char **data);


/**
 * @brief Specifies the type of function passed to iotcon_options_foreach().
 * @since_tizen 3.0
 * @param[in] id The information of the option
 * @param[in] data The data of the option
 * @param[in] user_data The user data to pass to the function
 * @return @c true to continue with the next iteration of the loop,
 *         otherwise @c false to break out of the loop
 *         #IOTCON_FUNC_CONTINUE and #IOTCON_FUNC_STOP are more friendly values for the return
 * @pre iotcon_options_foreach() will invoke this callback function.
 * @see iotcon_options_foreach()
 */
typedef bool (*iotcon_options_foreach_cb)(unsigned short id, const char *data, void *user_data);


/**
 * @brief Gets all data of the options by invoking the callback function.
 * @details iotcon_options_foreach_cb() will be called for each option. \n
 *          If iotcon_options_foreach_cb() returns false, iteration will be stopped.
 * @since_tizen 3.0
 * @param[in] options The handle of the options
 * @param[in] cb The callback function to get data
 * @param[in] user_data The user data to pass to the function
 * @return @c 0 on success,
 *         otherwise a negative error value
 * @retval #IOTCON_ERROR_NONE Successful
 * @retval #IOTCON_ERROR_NOT_SUPPORTED Not supported
 * @retval #IOTCON_ERROR_INVALID_PARAMETER Invalid parameter
 * @post iotcon_options_foreach_cb() will be called for each option.
 * @see iotcon_options_foreach_cb()
 */
int iotcon_options_foreach(iotcon_options_h options, iotcon_options_foreach_cb cb, void *user_data);


/**
 * @}
 */


#endif /* __IOTCON_STRUCT_OPTIONS_H__ */
