#include "RTClib.h"
#include "DHT.h"

#define DHTPIN 15     
#define DHTTYPE DHT22 

DHT dht(DHTPIN, DHTTYPE);

#include <LiquidCrystal_I2C.h>
#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4


LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
String operativeMode="TEMPERATURE_DRIVEN";
String data;
int relay1=35;
int relay2=32;
int relay3=33;
int relay4=25;
float maximumTemperatureThreshold=10;
float minimumHumidityThreshold=10;
RTC_DS1307 rtc;
char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

void setup() {
  {
  Serial.begin(115200);
  Serial.println(F("DHT22 example!"));
  Serial.println("IRRIOT, inc.");
  Serial.println("Developer: Axel Fiestas");

  dht.begin();
  }
  {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(3,0);
  lcd.print("welcome to");
  lcd.setCursor(2,1);
  lcd.print("SMART FARMING");
  delay(4000);
  pinMode(relay1, OUTPUT);
  pinMode(relay2, OUTPUT);
  pinMode(relay3, OUTPUT);
  pinMode(relay4, OUTPUT);
  Serial.println("welcome to my project");
  delay(500);
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  }
  lcd.clear();
  }
}

void loop() {

DateTime now = rtc.now();

printTime(now);

float temperature = dht.readTemperature();
float humidity = dht.readHumidity();


if(operativeMode=="SCHEDULE_DRIVEN"){
  scheduleDrivenMode(now);  
}else if(operativeMode=="TEMPERATURE_DRIVEN"){

  if(isTemperatureAboveMaximumThreshold(maximumTemperatureThreshold,temperature)){
    scheduleDrivenMode(now); 
  }else{
    disableValves();
  }
}else if(operativeMode=="HUMIDITY_DRIVEN"){

  if(isHumidityBelowMinimumHumidityThreshold(minimumHumidityThreshold,humidity)){
    scheduleDrivenMode(now); 
  }else{
    disableValves();
  }

}


  // Check if any reads failed and exit early (to try again).
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  Serial.print(F("Humidity: "));
  Serial.print(humidity);
  Serial.print(F("%  Temperature: "));
  Serial.print(temperature);
  Serial.println(F("°C "));
   lcd.setCursor(0,3);
  lcd.print(F("Temp: "));
  lcd.print(temperature);
  lcd.setCursor(10,3);
  lcd.print(F("Hum: "));
  lcd.print(humidity);
 

}

boolean isTemperatureAboveMaximumThreshold(float maximumTemperatureThreshold,float temperature){
  if(temperature>maximumTemperatureThreshold){
    return true;
  }else{
    return false;
  }
}

boolean isHumidityBelowMinimumHumidityThreshold(float minimumHumidityThreshold, float humidity){
  if(humidity<minimumHumidityThreshold){
    return true;
  }else{
    return false;
  }
}


void printTime(DateTime now){

  
  Serial.print("Current time: ");
  Serial.print(now.year(), DEC);
  Serial.print('/');
  Serial.print(now.month(), DEC);
  Serial.print('/');
  Serial.print(now.day(), DEC);
  Serial.print(" (");
  Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
  Serial.print(") ");
  Serial.print(now.hour(), DEC);
  Serial.print(':');
  Serial.print(now.minute(), DEC);
  Serial.print(':');
  Serial.print(now.second(), DEC);
  Serial.println();
  Serial.println();
  delay(3000);
  lcd.setCursor(3,0);
  lcd.print("Time:");
  lcd.print(now.hour(), DEC);
  lcd.print(':');
  lcd.print(now.minute(), DEC);
  lcd.print(':');
  lcd.print(now.second(), DEC);
}

void disableValves(){
    lcd.setCursor(0,1);
    lcd.print("Relay1:OFF");
    digitalWrite(relay1, LOW);
    lcd.setCursor(10,1);
    lcd.print("Relay2:OFF");
    digitalWrite(relay2, LOW);
    lcd.setCursor(0,2);
    lcd.print("Relay3:OFF");
    digitalWrite(relay3, LOW);
    lcd.setCursor(10,2);
    lcd.print("Relay4:OFF");
    digitalWrite(relay4, LOW);
}

void scheduleDrivenMode(DateTime now){
if((now.second()> 1) && (now.second()<15))
  {
  lcd.setCursor(0,1);
  lcd.print("Relay1:ON ");

   Serial.println("relay1 is on");
   digitalWrite(relay1, HIGH);
  }
  else{
    lcd.setCursor(0,1);
    lcd.print("Relay1:OFF");
    digitalWrite(relay1,LOW);
  }
  
   if((now.second()> 20) && (now.second()<30))
  {
  lcd.setCursor(10,1);
  lcd.print("Relay2:ON ");
   Serial.println("relay2 is on");
   digitalWrite(relay2, HIGH);
  }
  else{
   lcd.setCursor(10,1);
  lcd.print("Relay2:OFF");
  digitalWrite(relay2,LOW);
  }
  if((now.second()> 35) && (now.second()<45))
  {
   lcd.setCursor(0,2);
  lcd.print("Relay3:ON ");
   Serial.println("relay3 is on");
   digitalWrite(relay3, HIGH);
  }
  else{
    lcd.setCursor(0,2);
  lcd.print("Relay3:OFF");
  digitalWrite(relay3,LOW);
  }
   if((now.second()> 50) && (now.second()<59))
  {
    lcd.setCursor(10,2);
  lcd.print("Relay4:ON ");
   Serial.println("relay4 is on");
   digitalWrite(relay4, HIGH);
  }
  else{
    lcd.setCursor(10,2);
  lcd.print("Relay4:OFF");
  digitalWrite(relay4,LOW);
  }
}