#define BLYNK_TEMPLATE_ID "TMPL64ftw-bBX"
#define BLYNK_TEMPLATE_NAME "Project ChemTex"
#define BLYNK_AUTH_TOKEN "l_oPs5mLHjAOQrI98W305gbvw-BIPA9W"
#define BLYNK_PRINT Serial

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int Soil_PIN = 34;
const int PH_PIN = 35;
int led_green = 32;
int led_yellow = 33;
int led_red = 25;
BlynkTimer timer;

void setup() {
  Wire.begin(23, 22);
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();

  lcd.setCursor(5, 0);
  lcd.print("ChemTex");

  lcd.setCursor(5, 1);
  lcd.print("Group 9");

  pinMode(Soil_PIN,INPUT);
  pinMode(PH_PIN,INPUT);
  pinMode(led_green, OUTPUT);
  pinMode(led_yellow, OUTPUT);
  pinMode(led_red, OUTPUT);

  delay(3000);
  lcd.clear();

  Blynk.begin(auth, ssid, pass);
  timer.setInterval(2000, sendSensor);
}

void sendSensor() {
  int16_t soilMoisture = analogRead(Soil_PIN);
  Blynk.virtualWrite(V0, soilMoisture);  

  String soilMsg;

  if (soilMoisture > 69) {
    soilMsg = "WET";
  } else if (soilMoisture > 49 && soilMoisture < 70) {
    soilMsg = "BORDER";
  } else {
    soilMsg = "DRY";
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Soil: ");
  lcd.print(soilMsg);
  lcd.setCursor(0, 1);
  lcd.print("Moisture: ");
  lcd.print(soilMoisture);
  lcd.print(" %");

  Serial.print("Soil Moisture: ");
  Serial.println(soilMoisture);
  
  delayWithMillis(2000);

  float pHLevel = map(analogRead(PH_PIN), 0, 4095, 0.0, 14.0);
  Blynk.virtualWrite(V1, pHLevel); 

  String pHMsg;

  if (pHLevel > 7) {
    pHMsg = "BASE";
  } else if (pHLevel == 7) {
    pHMsg = "NEUTRAL";
  } else {
    pHMsg = "ACID";
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("pH: ");
  lcd.print(pHMsg);
  lcd.setCursor(0, 1);
  lcd.print("pH Level: ");
  lcd.print(pHLevel);

  Serial.print("pH Level: ");
  Serial.println(pHLevel);
  
  delayWithMillis(2000); 

 if ((soilMoisture > 69) && (6.8 < pHLevel && pHLevel < 7.2)) {
    digitalWrite(led_green, HIGH);
    Blynk.virtualWrite(V2, HIGH);
    digitalWrite(led_yellow, LOW);
    Blynk.virtualWrite(V3, LOW);
    digitalWrite(led_red, LOW);
    Blynk.virtualWrite(V4, LOW);

  } else if ((soilMoisture > 49 && soilMoisture < 70) && ((5.5 < pHLevel && pHLevel < 6.8) || (7.2 < pHLevel && pHLevel < 7.5))) {
    digitalWrite(led_green, LOW);
    Blynk.virtualWrite(V2, LOW);
    digitalWrite(led_yellow, HIGH);
    Blynk.virtualWrite(V3, HIGH);
    digitalWrite(led_red, LOW);
    Blynk.virtualWrite(V4, LOW);

  } else {
    digitalWrite(led_green, LOW);
    Blynk.virtualWrite(V2, LOW);
    digitalWrite(led_yellow, LOW);
    Blynk.virtualWrite(V3, LOW);
    digitalWrite(led_red, HIGH);
    Blynk.virtualWrite(V4, HIGH);
  }
}

void delayWithMillis(unsigned long ms)
{
  unsigned long currentMillis = millis();
  while (millis() - currentMillis < ms)
  {
    // Do nothing, just wait
  }
}

void loop() {
  Blynk.run();
  timer.run();
}