#ifndef MQTT_PROTOCOL_H
#define MQTT_PROTOCOL_H


#include <stdint.h>
#include <stddef.h>


/*
 * 小智MQTT消息类型
 */
enum mqtt_protocol_message_type
{

    MQTT_PROTOCOL_MSG_UNKNOWN = 0,

    MQTT_PROTOCOL_MSG_HELLO,

    MQTT_PROTOCOL_MSG_TTS,

    MQTT_PROTOCOL_MSG_STT,

    MQTT_PROTOCOL_MSG_LLM,

    MQTT_PROTOCOL_MSG_LISTEN,

    MQTT_PROTOCOL_MSG_GOODBYE

};


/*
 * 小智MQTT消息状态
 */
enum mqtt_protocol_message_state
{

    MQTT_PROTOCOL_STATE_NONE = 0,

    MQTT_PROTOCOL_STATE_START,

    MQTT_PROTOCOL_STATE_SENTENCE_START,

    MQTT_PROTOCOL_STATE_STOP,

    MQTT_PROTOCOL_STATE_DETECT

};


/*
 * 小智MQTT消息
 */
struct mqtt_protocol_message
{

    enum mqtt_protocol_message_type type;

    enum mqtt_protocol_message_state state;

    int has_code;

    int code;

    int has_version;

    int version;

    char transport[16];

    char session_id[64];

    char text[160];

};


/*
 * 消息回调
 *
 * 返回0表示协议层已处理, 返回-1表示无法识别
 */
int mqtt_protocol_handle_message
(
    const char *topic,
    const uint8_t *payload,
    uint32_t len
);


/*
 * 发送hello, 申请会话
 */
int mqtt_protocol_send_hello(void);


/*
 * 发送监听开始
 */
int mqtt_protocol_send_listen_start(void);


/*
 * 发送监听停止
 */
int mqtt_protocol_send_listen_stop(void);


/*
 * 发送中止
 */
int mqtt_protocol_send_abort(void);


/*
 * 发送bye
 */
int mqtt_protocol_send_goodbye(void);


/*
 * 获取当前会话ID
 */
const char *mqtt_protocol_session_id(void);


/*
 * 设置协议消息回调
 */
typedef void (*mqtt_protocol_callback_t)
(
    const struct mqtt_protocol_message *message
);

void mqtt_protocol_set_callback(mqtt_protocol_callback_t callback);


#endif