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#ifndef MQTT_AL_H
#define MQTT_AL_H

#include <stdint.h>
#include <dtls_al.h>

#if defined(__cplusplus)
extern "C" {
#endif

/** brief defines for all the ascii or data used in the mqtt engine */
typedef struct
{
    char *data;      ///< buffer to storage the data
    int   len;       ///< buffer data length
}mqtt_al_string_t;   //used to represent any type string (maybe not ascii)

///** @brief  this enum all the transport encode we support now*/
//typedef enum
//{
//  en_mqtt_al_security_none = 0,    ///< no encode
//  en_mqtt_al_security_psk,         ///< use the psk mode in transport layer
//  en_mqtt_al_security_cas,         ///< use the ca mode in transport layer,only check the server
//  en_mqtt_al_security_cacs,        ///< use the ca mode in transport layer,both check the server and client
//  en_mqtt_al_security_end,         ///< the end for the mqtt
//}en_mqtt_al_security_t;
//
///** @brief this data defines for the psk mode*/
//typedef struct
//{
//  mqtt_al_string_t  psk_id;   ///< the psk id
//  mqtt_al_string_t  psk_key;  ///< the psk key
//}mqtt_al_security_psk_t;
//
///** @brief this data defines for the cas mode:only check the server  */
//typedef struct
//{
//    mqtt_al_string_t  ca_crt;  ///<  the ca crt
//}mqtt_al_security_cas_t;
//
//
///** @brief this data defines for the cacs mode:both check the server and client */
//typedef struct
//{
//  mqtt_al_string_t ca_s_crt;     ///< the server crt
//  mqtt_al_string_t ca_c_crt;     ///< the client crt
//  mqtt_al_string_t ca_c_key;     ///< the client ca key
//  mqtt_al_string_t ca_host;      ///< for peer certificate, maybe they need this
//}mqtt_al_security_cacs_t;
//
///** @brief this data defines for the encode parameter for the connect */
//typedef struct
//{
//  en_mqtt_al_security_t type;         ///< which security type of the data
//    union
//    {
//      mqtt_al_security_psk_t   psk;   ///< psk data  if the type is en_mqtt_security_psk
//      mqtt_al_security_cas_t   cas;   ///< cas data  if the type is en_mqtt_security_cas
//      mqtt_al_security_cacs_t  cacs;  ///< cacs data if the type is en_mqtt_security_cacs
//    }u;
//}mqtt_al_security_para_t;

/** @brief enum all the qos supported for the application */
typedef enum
{
    en_mqtt_al_qos_0 = 0,     ///< mqtt QOS 0
    en_mqtt_al_qos_1,         ///< mqtt QOS 1
    en_mqtt_al_qos_2,         ///< mqtt QOS 2
    en_mqtt_al_qos_err
}en_mqtt_al_qos_t;

/** @brief defines the parameter used for the will message used in connect */
typedef struct
{
    mqtt_al_string_t  topic;    ///< will topic
    mqtt_al_string_t  msg;      ///< will message
    en_mqtt_al_qos_t  qos;      ///< will message qos
    int               retain;   ///< will message retain or not:1 retain while 0 not
}mqtt_al_willmsg_t;

/** @brief enum the mqtt version*/
typedef enum
{
    en_mqtt_al_version_3_1_0 = 0,
    en_mqtt_al_version_3_1_1,
}en_mqtt_al_verison;



/** @brief defines the paramter for the mqtt connect */
typedef struct
{
    mqtt_al_string_t               serveraddr;   ///< mqtt server:support domain name and dot format
    int                            serverport;   ///< mqtt server port
    dtls_al_security_t            *security;     ///< if NULL,will use en_mqtt_security_none
    en_mqtt_al_verison             version;      ///< mqtt version will be used
    mqtt_al_string_t               clientid;     ///< mqtt connect client identifier
    mqtt_al_string_t               user;         ///< mqtt connect user
    mqtt_al_string_t               passwd;       ///< mqtt connect pwd
    int                            cleansession; ///< 1 clean the session while 0 not
    mqtt_al_willmsg_t             *willmsg;      ///< mqtt connect will message
    unsigned short                 keepalivetime;///< keep alive time
    char                           conret;       ///< mqtt connect code, return by server
    int                            timeout;      ///< how much time will be blocked
}mqtt_al_conpara_t;

/** @brief defines for the mqtt publish */
typedef struct
{
    mqtt_al_string_t    topic;    ///< selected publish topic
    mqtt_al_string_t    msg;      ///< message to be published
    en_mqtt_al_qos_t    qos;      ///< message qos
    int                 retain;   ///< message retain :1 retain while 0 not
    int                 timeout;  ///< how much time will blocked
}mqtt_al_pubpara_t;


/** @brief  defines for the message will be passed to the application dealer*/
typedef struct
{
    mqtt_al_string_t       topic; ///< message topic
    mqtt_al_string_t       msg;   ///< the topic message payload
    en_mqtt_al_qos_t       qos;   ///< message qos
    int                    dup;   ///< message dup times
    int                    retain;///< retain or not
}mqtt_al_msgrcv_t;

/** @brief  defines the mqtt received message dealer, called by mqtt engine*/
typedef void (*fn_mqtt_al_msg_dealer)(void *arg,mqtt_al_msgrcv_t *msg);

/** @brief defines the mqtt subscribe parameter*/
typedef struct
{
    mqtt_al_string_t       topic;     ///< topic will be subscribe
    en_mqtt_al_qos_t       qos;       ///< qos requested
    fn_mqtt_al_msg_dealer  dealer;    ///< message dealer:used to deal the received message
    void                  *arg;       ///< used for the message dealer
    char                   subret;    ///< subscribe result code
    int                    timeout;   ///< how much time will be blocked
}mqtt_al_subpara_t;

/** @brief defines the mqtt unsubscribe parameter*/
typedef struct
{
    mqtt_al_string_t       topic;    ///< the unsubscribe topic
    uint32_t               timeout;  ///< how much time will be blocked
}mqtt_al_unsubpara_t;

/** @brief  descript the mqtt engine status */
typedef enum
{
    en_mqtt_al_connect_ok     = 0,      ///< which means the mqtt is ok and could supply the service
    en_mqtt_al_connect_err,             ///< the mqtt no start or connect err
}en_mqtt_al_connect_state;

/** @brief defines for the mqtt connect code returned by the server */
#define cn_mqtt_al_con_code_ok                0   ///< has been accepted by the server
#define cn_mqtt_al_con_code_err_version       1   ///< server not support the version
#define cn_mqtt_al_con_code_err_clientID      2   ///< client identifier is error
#define cn_mqtt_al_con_code_err_netrefuse     3   ///< server service not ready yet
#define cn_mqtt_al_con_code_err_u_p           4   ///< bad user name or pwd
#define cn_mqtt_al_con_code_err_auth          5   ///< the client is not authorized
#define cn_mqtt_al_con_code_err_unkown        -1  ///< unknown reason
#define cn_mqtt_al_con_code_err_network      0x80 ///< network reason,you could try once more


/** @brief defines for the mqtt subscribe code returned by the server */
#define cn_mqtt_al_sub_code_qos0      0     ///< success and max qos is QOS 0
#define cn_mqtt_al_sub_code_qos1      1     ///< success and max qos is QOS 1
#define cn_mqtt_al_sub_code_qos2      2     ///< success and max qos is QOS 2
#define cn_mqtt_al_sub_code_err       0x80  ///< subscribe failure

/**
 *@brief defines the operation will be registered  to the mqtt service
 *@brief parameter and return code refere to the corresponding api
 *
 */
typedef struct
{
//  ///< the mqtt init function
//  int  (*  init)      (void);
//  ///< the mqtt deinit function
//  int   (* deinit)    (void );  ---TODO, have a thought if we really need it
    ///< connect to the server
    void* (* connect)   (mqtt_al_conpara_t *param);
    ///< disconnect from the server
    int    (* disconnect)(void *handle );
    ///< publish a message to the server
    int    (* publish)    (void *handle, mqtt_al_pubpara_t *msg);
    ///< subscribe a topic to the server
    int    (* subscribe)   (void *handle, mqtt_al_subpara_t *subpara);
    ///< unsubscribe a topic to the server
    int    (* unsubscribe) (void *handle, mqtt_al_unsubpara_t *unsubpara);
    ///< check the mqtt engine status
    en_mqtt_al_connect_state (* check_status) (void *handle);

}mqtt_al_op_t;


//////////////////////API USED FOR THE MQTT APPLICAITON/////////////////////////

/**
 * @brief maybe the mqtt lib need do some initialize
 *
 * @return 0 success while -1 failed
 *
 */
int mqtt_al_init();

/**
 * @brief     :when you don't want to use the mqtt service ,please call this function
 *
 * @return 0 success while -1 failed
 */
int  mqtt_al_deinit();
/**
 *@brief: you could use this function to connect to the mqtt server
 *
 *@param[in] conparam  the parameter we will use in connect, refer to the data mqtt_al_conpara_t
 *@
 *@return: first you should check the return value then the return code in conparam
 *
 *@retval NULL which means you could not get the connect to the server,maybe network reason
 *@retval handle, which means you get the context, please check the conparam for more
 */
void * mqtt_al_connect( mqtt_al_conpara_t *conparam);

/**
 * @brief  : you could use this function to disconnect from the mqtt server
 *
 * @param[in] handle  the handle we get from mqtt_al_connect

 * @return  0 success -1 failed

 */
int mqtt_al_disconnect(void *handle);


/**
 * @brief you could use this function to publish a message to the server
 *
 * @param[in] handle the handle we get from mqtt_al_connect
 *
 * @param[in] msg  the message we will publish, see the data mqtt_al_pubpara_t
 *
 * @return 0 success  -1  failed
 *
 */
int mqtt_al_publish(void *handle, mqtt_al_pubpara_t *pubpara);

/**
 * @brief you could use this function subscribe a topic from the server
 *
 * @param[in] handle the handle we get from mqtt_al_connect
 *
 * @param[in] subpara  refer to the data mqtt_al_subpara_t
 *
 * @return 0 success  -1  failed
 *
 */
int mqtt_al_subscribe(void *handle, mqtt_al_subpara_t *subpara);

/**
 * @brief you could use this function unsubscribe a topic from the server
 *
 * @param[in] handle the handle we get from mqtt_al_connect
 *
 * @param[in] unsubpara  refer to the data mqtt_al_unsubpara_t
 *
 * @return 0 success  -1  failed
 *
 */
int mqtt_al_unsubscribe(void *handle, mqtt_al_unsubpara_t *unsubpara);

/**
 *  @brief the mqtt engine state now
 *
 *  @param[in]  handle the handle we get from mqtt_al_connect
 *
 *  @return refer to  en_mqtt_al_connect_state
 */
en_mqtt_al_connect_state mqtt_al_check_status(void *handle);

//////////////////////API USED FOR THE MQTT IMPLEMENT/////////////////////////

/**
 *@brief the mqtt lib should call this function to register its implement as a service
 *
 *@param[in] op  refer to the data  mqtt_al_op_t
 *
 *@return 0 success while -1 failed
 *
 */
int mqtt_al_install(mqtt_al_op_t *op);
/**
 *@brief call this function to unregister the mqtt service
 *
 *@param[in] op  refer to the data  mqtt_al_op_t
 *
 *@return 0 success while -1 failed
 *
 */
int mqtt_al_uninstall();



#if defined(__cplusplus)
}
#endif

#endif /* MQTT_AL_H */
