/* mqtt.h
*
* Copyright (c) 2014-2015, Tuan PM <tuanpm at live dot com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Redis nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef USER_AT_MQTT_H_
#define USER_AT_MQTT_H_

#include <esp8266.h>
#include "mqtt_msg.h"
#include "queue.h"

typedef struct mqtt_event_data_t {
  uint8_t type;
  const char* topic;
  const char* data;
  uint16_t topic_length;
  uint16_t data_length;
  uint16_t data_offset;
} mqtt_event_data_t;

typedef struct mqtt_state_t {
  uint16_t port;
  int auto_reconnect;
  mqtt_connect_info_t* connect_info;
  uint8_t* in_buffer;
  uint8_t* out_buffer;
  int in_buffer_length;
  int out_buffer_length;
  uint16_t message_length;
  uint16_t message_length_read;
  mqtt_message_t* outbound_message;
  mqtt_connection_t mqtt_connection;
  uint16_t pending_msg_id;
  int pending_msg_type;
  int pending_publish_qos;
} mqtt_state_t;

typedef enum {
  WIFI_INIT,
  WIFI_CONNECTING,
  WIFI_CONNECTING_ERROR,
  WIFI_CONNECTED,
  DNS_RESOLVE,
  TCP_DISCONNECTED,
  TCP_RECONNECT_REQ,
  TCP_RECONNECT,
  TCP_CONNECTING,
  TCP_CONNECTING_ERROR,
  TCP_CONNECTED,
  MQTT_CONNECT_SEND,
  MQTT_CONNECT_SENDING,
  MQTT_SUBSCIBE_SEND,
  MQTT_SUBSCIBE_SENDING,
  MQTT_DATA,
  MQTT_PUBLISH_RECV,
  MQTT_PUBLISHING
} tConnState;

typedef void (*MqttCallback)(uint32_t* args);
typedef void (*MqttDataCallback)(uint32_t* args, const char* topic, uint32_t topic_len, const char* data, uint32_t lengh);

typedef struct {
  struct espconn* pCon;
  uint8_t security;
  char* host;
  uint32_t port;
  ip_addr_t ip;
  mqtt_state_t mqtt_state;
  mqtt_connect_info_t connect_info;
  MqttCallback connectedCb;
  MqttCallback cmdConnectedCb;
  MqttCallback disconnectedCb;
  MqttCallback cmdDisconnectedCb;
  MqttCallback tcpDisconnectedCb;
  MqttCallback cmdTcpDisconnectedCb;
  MqttCallback publishedCb;
  MqttCallback cmdPublishedCb;
  MqttDataCallback dataCb;
  MqttDataCallback cmdDataCb;
  ETSTimer mqttTimer;
  uint32_t keepAliveTick;
  uint32_t reconnectTick;
  uint32_t sendTimeout;
  tConnState connState;
  QUEUE msgQueue;
  void* user_data;
} MQTT_Client;

#define SEC_NONSSL 0
#define SEC_SSL	1

#define MQTT_FLAG_CONNECTED 	1
#define MQTT_FLAG_READY 		2
#define MQTT_FLAG_EXIT 			4

#define MQTT_EVENT_TYPE_NONE 			0
#define MQTT_EVENT_TYPE_CONNECTED 		1
#define MQTT_EVENT_TYPE_DISCONNECTED 	2
#define MQTT_EVENT_TYPE_SUBSCRIBED 		3
#define MQTT_EVENT_TYPE_UNSUBSCRIBED 	4
#define MQTT_EVENT_TYPE_PUBLISH 		5
#define MQTT_EVENT_TYPE_PUBLISHED 		6
#define MQTT_EVENT_TYPE_EXITED 			7
#define MQTT_EVENT_TYPE_PUBLISH_CONTINUATION 8

void MQTT_InitConnection(MQTT_Client* mqttClient, char* host, uint32 port, uint8_t security);
void MQTT_InitClient(MQTT_Client* mqttClient, char* client_id, char* client_user, char* client_pass, uint8_t keepAliveTime, uint8_t cleanSession);
void MQTT_InitLWT(MQTT_Client* mqttClient, char* will_topic, char* will_msg, uint8_t will_qos, uint8_t will_retain);
void MQTT_OnConnected(MQTT_Client* mqttClient, MqttCallback connectedCb);
void MQTT_OnDisconnected(MQTT_Client* mqttClient, MqttCallback disconnectedCb);
void MQTT_OnPublished(MQTT_Client* mqttClient, MqttCallback publishedCb);
void MQTT_OnData(MQTT_Client* mqttClient, MqttDataCallback dataCb);
bool MQTT_Subscribe(MQTT_Client* client, char* topic, uint8_t qos);
void MQTT_Connect(MQTT_Client* mqttClient);
void MQTT_Disconnect(MQTT_Client* mqttClient);
bool MQTT_Publish(MQTT_Client* client, const char* topic, const char* data, uint8_t qos, uint8_t retain);

#endif /* USER_AT_MQTT_H_ */