/*
 * This file is subject to the terms and conditions defined in
 * file 'LICENSE', which is part of this source code package.
 * Tuan PM <tuanpm at live dot com>
 */

#ifndef _MQTT_CLIENT_H_
#define _MQTT_CLIENT_H_

#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include "esp_err.h"

#include "mqtt_config.h"

#ifdef __cplusplus
extern "C" {
#endif

typedef struct esp_mqtt_client* esp_mqtt_client_handle_t;

typedef enum {
    MQTT_EVENT_ERROR = 0,
    MQTT_EVENT_CONNECTED,
    MQTT_EVENT_DISCONNECTED,
    MQTT_EVENT_SUBSCRIBED,
    MQTT_EVENT_UNSUBSCRIBED,
    MQTT_EVENT_PUBLISHED,
    MQTT_EVENT_DATA,
} esp_mqtt_event_id_t;

typedef enum {
    MQTT_TRANSPORT_UNKNOWN = 0x0,
    MQTT_TRANSPORT_OVER_TCP,
    MQTT_TRANSPORT_OVER_SSL,
    MQTT_TRANSPORT_OVER_WS,
    MQTT_TRANSPORT_OVER_WSS
} esp_mqtt_transport_t;

typedef struct {
    esp_mqtt_event_id_t event_id;
    esp_mqtt_client_handle_t client;
    void *user_context;
    char *data;
    int data_len;
    int total_data_len;
    int current_data_offset;
    char *topic;
    int topic_len;
    int msg_id;
} esp_mqtt_event_t;

typedef esp_mqtt_event_t* esp_mqtt_event_handle_t;

typedef esp_err_t (* mqtt_event_callback_t)(esp_mqtt_event_handle_t event);


typedef struct {
    mqtt_event_callback_t event_handle;
    const char *host;
    const char *uri;
    uint32_t port;
    const char *client_id;
    const char *username;
    const char *password;
    const char *lwt_topic;
    const char *lwt_msg;
    int lwt_qos;
    int lwt_retain;
    int lwt_msg_len;
    int disable_clean_session;
    int keepalive;
    bool disable_auto_reconnect;
    void *user_context;
    int task_prio;
    int task_stack;
    int buffer_size;
    const char *cert_pem;
    esp_mqtt_transport_t transport;
} esp_mqtt_client_config_t;

esp_mqtt_client_handle_t esp_mqtt_client_init(const esp_mqtt_client_config_t *config);
esp_err_t esp_mqtt_client_set_uri(esp_mqtt_client_handle_t client, const char *uri);
esp_err_t esp_mqtt_client_start(esp_mqtt_client_handle_t client);
esp_err_t esp_mqtt_client_stop(esp_mqtt_client_handle_t client);
esp_err_t esp_mqtt_client_subscribe(esp_mqtt_client_handle_t client, const char *topic, int qos);
esp_err_t esp_mqtt_client_unsubscribe(esp_mqtt_client_handle_t client, const char *topic);
int esp_mqtt_client_publish(esp_mqtt_client_handle_t client, const char *topic, const char *data, int len, int qos, int retain);
esp_err_t esp_mqtt_client_destroy(esp_mqtt_client_handle_t client);

#ifdef __cplusplus
}
#endif //__cplusplus

#endif