#include <SD.h>
#include <SPI.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <LiquidCrystal_I2C.h>

File tempFile;
File moistFile;

#define ONE_WIRE_BUS 8
#define motorPin 9
#define vccMoist 7

#define AOUT_PIN A0
#define THRESHOLD 300

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

int temp;
String dryOrWet = "---";
const int pinCS = 10;
bool motorState = false;
String motorOnorOff = "OFF";
bool wetState;

//button
int button = 5;
int status = false;

bool lcdClearStatus = false;

void setup() {
  Serial.begin(9600);
  sensors.begin();
  pinMode (pinCS, OUTPUT);
  pinMode (4, OUTPUT);
  pinMode (motorPin, OUTPUT);
  pinMode (vccMoist, OUTPUT);

  pinMode (button, INPUT_PULLUP);

  lcd.init();
  lcd.backlight();

  if (SD.begin()){
    Serial.println("SD Card is ready to use");
    Serial.println("");
  } else{
    Serial.println("SD Card Initializarion Failed");
    return;
  }
}

void loop() {
  sensors.requestTemperatures();

  int temp = sensors.getTempCByIndex(0);
  int value = analogRead(AOUT_PIN);

  tempFile = SD.open("temp.txt", FILE_WRITE);
  moistFile = SD.open("moist.txt", FILE_WRITE);


  if(digitalRead(button) == false){
    status = !status;
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("NPK PERCENTAGE");
    lcd.setCursor(0, 1);
    lcd.print("Nitrogren: ");
    lcd.setCursor(0, 2);
    lcd.print("Phosporus: ");
    lcd.setCursor(0, 3);
    lcd.print("Potassium: ");
  } else {
    lcd.clear();
    //Temperature
    lcd.setCursor(1, 0);
    lcd.print("Temperature: ");
    lcd.println((String)temp+ " C");
    lcd.setCursor(6, 1);
    lcd.print("Motor ");
    lcd.println(motorOnorOff);

    //Moisture
    lcd.setCursor(0, 2);
    lcd.print("Moisture Level: ");
    lcd.println(value);
    lcd.setCursor(2, 3);
    lcd.print("The soil is ");
    lcd.println(dryOrWet);

  }

    //WRITE TEMPERATURE DATA TO SD CARD
    if(tempFile){
      tempFile.print(temp);
      tempFile.close();
      digitalWrite(4, HIGH); //This line is just to check if the txt file is created
    } else {
      Serial.println("Error Opening file");
    }

    //WRITE MOISTURE DATA TO SD CARD
    if(moistFile){
      moistFile.print(value);
      moistFile.close();
      digitalWrite(4, HIGH); //This line is just to check if the txt file is created
    } else {
      Serial.println("Error Opening file");
    }

    //Temperature
    while(temp >= 90 && !motorState){
      digitalWrite(motorPin, HIGH);
      Serial.println("Motor ON");
      motorState = true;
      motorOnorOff = "ON";
    }
    while(temp <90 && motorState == true){
      digitalWrite(motorPin, LOW);
      Serial.println("Motor OFF");
      motorState = false;
      motorOnorOff = "OFF";
    }

    //Moisture
    if(value > THRESHOLD){
      wetState = true;
      digitalWrite(vccMoist, HIGH);
    } else {
      wetState = false;
      digitalWrite(vccMoist, LOW);
    }

    while(value < THRESHOLD && wetState == false){
      Serial.println("The soil is DRY");
      dryOrWet = "DRY";
      wetState = true;
    } 

    while(value >= THRESHOLD && wetState == true){
      Serial.println("The soil is WET");
      dryOrWet = "WET";
      wetState = false;
    }
  
    Serial.print("Moisture Level: ");
    Serial.print(value);
    Serial.println("");
    Serial.print("Celsius Temperature: ");
    Serial.println(sensors.getTempCByIndex(0));
    Serial.println("");

  delay(2000);
}