//WIFI and ADC2 Channels are not working together hence using ADC1 channels

#include <stdlib.h>
#include <string.h>

#include <WiFi.h>
#include <PubSubClient.h>

#define ThermistorPin 35
#define LDR_PIN       33
#define SOIL_MOISTURE_PIN 34

#define MOTOR         12

#define R1  10000
#define C1  (float)1.009249522e-03
#define C2  (float)2.378405444e-04
#define C3  (float)2.019202697e-07

// Update these with values suitable for your network.
const char* ssid = "hidden";
const char* password = "qwerty12";
const char* mqtt_server = "m15.cloudmqtt.com";
#define mqtt_port 16951
#define MQTT_USER "mnkobdft"
#define MQTT_PASSWORD "xOftMxYCCo91"
#define MQTT_SERIAL_PUBLISH_LIGHT "stechiez/agree/light"
#define MQTT_SERIAL_PUBLISH_TEMPERATUE "stechiez/agree/temp"
#define MQTT_SERIAL_PUBLISH_SOIL "stechiez/agree/soil"
#define MQTT_SERIAL_RECEIVER_MOTOR "stechiez/agree/motor"
#define MQTT_SERIAL_RECEIVER_MOTOR_STATUS "stechiez/agree/mstatus"


WiFiClient wifiClient;
PubSubClient client(wifiClient);

float avg[3]={0,0,0};

char light_array[7];
char soil_array[7];
char temp_array[7];


void setup_wifi() {
    delay(10);
    // We start by connecting to a WiFi network
    Serial.println();
    Serial.print("Connecting to ");
    Serial.println(ssid);
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      Serial.print(".");
    }
    randomSeed(micros());
    Serial.println("");
    Serial.println("WiFi connected");
    Serial.println("IP address: ");
    Serial.println(WiFi.localIP());
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str(),MQTT_USER,MQTT_PASSWORD)) {
      Serial.println("connected");
      //Once connected, publish an announcement...
      client.publish("/icircuit/presence/ESP32/", "hello world");
      // ... and resubscribe
      client.subscribe(MQTT_SERIAL_RECEIVER_MOTOR);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(3000);
    }
  }
}

void callback(char* topic, byte *payload, unsigned int length) {
    Serial.println("-------new message from broker-----");
    Serial.print("channel:");
    Serial.println(topic);
    Serial.print("data:");  
    Serial.write(payload, length);
    Serial.println();
    if(*payload == '0')
    {
      digitalWrite(MOTOR, 0);
    }
    else if(*payload == '1')
    {
      digitalWrite(MOTOR, 1);
    }
}

void publishSerialData(const char *pub_str,const char *serialData){
  if (!client.connected()) {
    reconnect();
  }
  client.publish(pub_str, serialData);
}


void setup() {
Serial.begin(115200);
pinMode(MOTOR, OUTPUT);

  Serial.setTimeout(500);// Set time out for 
  setup_wifi();
  client.setServer(mqtt_server, mqtt_port);
  client.setCallback(callback);
  reconnect();
  digitalWrite(MOTOR, 0);
}

//NTC Temparature Reading and Processing
float getTemperature(void)
{
  static int avgArrayIndex=0;
  int Vo;
  float logR2,R2, T, Tc;
  Vo = analogRead(ThermistorPin);
  R2 = R1 * (4096.0 / (float)Vo - 1.0);
  logR2 = log(R2);
  T = (1.0 / (C1 + C2*logR2 + C3*logR2*logR2*logR2));
  Tc = T - 273.15;
  avg[avgArrayIndex++] = Tc;
  if(avgArrayIndex > 2)
  avgArrayIndex = 0;
  Tc = (avg[0] + avg[1] + avg[2])/3;
  return Tc;
}


float getMoisturePercentage(void)
{
  float moisture_percentage;
  int sensor_analog;
  sensor_analog = analogRead(SOIL_MOISTURE_PIN);
  moisture_percentage = ( 100 - ( (sensor_analog/4096.00) * 100 ) );
  moisture_percentage = (float)moisture_percentage;
  return moisture_percentage;
}

float getLightPercentage(void)
{
  int ldrRawVal;
  float percentage;
  ldrRawVal = analogRead(LDR_PIN);    
  percentage = ((float)((ldrRawVal*100)/4096));
//  percentage = 100 - percentage;
  return percentage;
}

void loop() {
  float lightpercentage = getLightPercentage();
  float temp = getTemperature();
  float soilMoisturePer = getMoisturePercentage();
  String temp_s(temp);
  String soilPer_s(soilMoisturePer);
  String lightPer_s(lightpercentage);
  bool mstatus = digitalRead(MOTOR);
  String mstatus_s(mstatus);

  if(soilMoisturePer > 80.00)
  {
    digitalWrite(MOTOR, 0);
  }
  
  publishSerialData(MQTT_SERIAL_RECEIVER_MOTOR_STATUS,mstatus_s.c_str());  
  delay(2500);
  publishSerialData(MQTT_SERIAL_PUBLISH_SOIL,soilPer_s.c_str());
  delay(250);
  publishSerialData(MQTT_SERIAL_PUBLISH_TEMPERATUE,temp_s.c_str());
  delay(250);
  publishSerialData(MQTT_SERIAL_PUBLISH_LIGHT,lightPer_s.c_str());
  delay(250);
  client.loop();
  Serial.print("Temperature: "); 
  Serial.print(temp);
  Serial.print(" C, LDR: "); 
  Serial.print(lightpercentage,0); 
  Serial.print("%");
  Serial.print(" Moisture Percentage = ");
  Serial.print(soilMoisturePer);
  Serial.println("%");  
//  delay(400);
}