// Define Blynk credentials
#define BLYNK_TEMPLATE_ID "TMPL6g123SSWT"
#define BLYNK_TEMPLATE_NAME "Smart Plant Watering System"
#define BLYNK_AUTH_TOKEN "CYys0kjYwaOs_8NN-t-TuKGzn8mSkIw1"

// Enable Serial Monitor debugging
#define BLYNK_PRINT Serial

// Include necessary libraries
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT.h>
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>

// OLED display configuration
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// DHT sensor configuration
#define DHTPIN 4        // DHT22 sensor connected to GPIO 4
#define DHTTYPE DHT22   // DHT sensor type
DHT dht(DHTPIN, DHTTYPE);

// Moisture sensor and pump configuration
#define POT_PIN 34      // Analog pin for soil moisture sensor
#define PUMP_PIN 5      // Digital pin to control water pump

// Variables for pump control and moisture levels
bool pumpOn = false;
const int MOISTURE_LOW = 30;   // Minimum moisture threshold
const int MOISTURE_HIGH = 50;  // Maximum moisture threshold
int simulatedMoisture = 0;     // Simulated moisture value for testing

// WiFi credentials
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

void setup() {
  Serial.begin(115200); // Start Serial communication for debugging
  
  // Initialize OLED display
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("SSD1306 allocation failed");
    for (;;); // Halt execution if display initialization fails
  }
  display.clearDisplay();

  dht.begin(); // Initialize DHT sensor
  
  pinMode(PUMP_PIN, OUTPUT); // Set pump pin as output
  digitalWrite(PUMP_PIN, LOW); // Ensure pump is off initially

  // Read initial soil moisture value and map it to percentage
  simulatedMoisture = map(analogRead(POT_PIN), 0, 4095, 100, 0);

  // Connect to Blynk cloud
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
}

void loop() {
  Blynk.run(); // Handle Blynk cloud communication
  
  float temperature = dht.readTemperature(); // Read temperature from DHT sensor
  float humidity = dht.readHumidity(); // Read humidity from DHT sensor

  // Read soil moisture value from analog pin and convert to percentage
  int potValue = analogRead(POT_PIN);
  int moisturePercent = map(potValue, 0, 4095, 100, 0);

  // Simulate moisture increase when pump is on
  if (pumpOn) {
    if (simulatedMoisture < MOISTURE_HIGH) {
      simulatedMoisture += 5;
    }
    moisturePercent = simulatedMoisture;
  } else {
    simulatedMoisture = moisturePercent;
  }

  // Print sensor values to Serial Monitor
  Serial.print("Temp: "); Serial.print(temperature); Serial.print(" C, ");
  Serial.print("Humidity: "); Serial.print(humidity); Serial.print(" %, ");
  Serial.print("Soil Moisture: "); Serial.print(moisturePercent); Serial.println(" %");

  // Update OLED display
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.println("Smart Watering System");
  display.setCursor(0, 10);
  display.print("Temp: "); display.print(temperature); display.println(" C");
  display.print("Humidity: "); display.print(humidity); display.println(" %");
  display.print("Moisture: "); display.print(moisturePercent); display.println(" %");
  display.display();

  // Send sensor data to Blynk app
  Blynk.virtualWrite(V0, temperature);
  Blynk.virtualWrite(V1, humidity);
  Blynk.virtualWrite(V2, moisturePercent);

  // Control pump based on soil moisture level
  if (!pumpOn && moisturePercent < MOISTURE_LOW) {
    pumpOn = true;
    digitalWrite(PUMP_PIN, HIGH); // Turn pump ON
    Serial.println("🚰 Pump ON: Watering...");
    Blynk.virtualWrite(V3, 255);
    Blynk.logEvent("pump_on", "Pump turned ON: Soil is too dry!");
  } 
  else if (pumpOn && moisturePercent >= MOISTURE_HIGH) {
    pumpOn = false;
    digitalWrite(PUMP_PIN, LOW); // Turn pump OFF
    Serial.println("🌞 Pump OFF: Soil is wet enough.");
    Blynk.virtualWrite(V3, 0);
    Blynk.logEvent("pump_off", "Pump turned OFF: Soil moisture is sufficient.");
  }

  // Alert if temperature exceeds threshold
  if (temperature > 35) {  
    Blynk.logEvent("high_temp", "Warning! High Temperature detected: " + String(temperature) + "°C");
  }

  delay(2000); // Wait for 2 seconds before next loop iteration
}