#define BLYNK_TEMPLATE_ID "TMPL3Dc0_Sn9y"
#define BLYNK_TEMPLATE_NAME "Smart Agriculture"
#define BLYNK_AUTH_TOKEN "lWXg0DUTJucl5cr-SQCTnAttaOOUch5N"

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

// Pin definitions
#define DHTPIN 15
#define DHTTYPE DHT22
#define SOIL_PIN 34
#define LDR_PIN 35
#define BUZZER_PIN 25
#define RELAY_PIN 26

// Threshold values
#define SOIL_DRY 3000    // Calibrate these!
#define SOIL_WET 1000    // for your soil sensor
#define TEMP_HIGH 40.0
#define TEMP_LOW 5.0
#define HUM_HIGH 90.0
#define HUM_LOW 20.0
#define LIGHT_DARK 300

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

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);
BlynkTimer timer;

// Alert tracking
bool lastTempAlert = false;
bool lastHumAlert = false;
bool lastSoilAlert = false;
bool lastLightAlert = false;

void setup() {
  Serial.begin(115200);
  
  // Initialize hardware
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(BUZZER_PIN, LOW);
  digitalWrite(RELAY_PIN, LOW);
  
  dht.begin();
  
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.print("System booting...");
  
  // Connect to WiFi
  Serial.println("Connecting to WiFi...");
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected!");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
  
  // Connect to Blynk
  Serial.println("Connecting to Blynk...");
  Blynk.config(auth);
  while (!Blynk.connect()) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println("\nBlynk connected!");
  
  timer.setInterval(2000L, checkConditions);
}

void checkConditions() {
  // Read sensors
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();
  int soil = analogRead(SOIL_PIN);
  int light = analogRead(LDR_PIN);
  
  // Convert soil moisture
  int soilPercent = map(soil, SOIL_DRY, SOIL_WET, 0, 100);
  soilPercent = constrain(soilPercent, 0, 100);
  
  // Check thresholds
  bool currentTempAlert = (temp >= TEMP_HIGH || temp <= TEMP_LOW);
  bool currentHumAlert = (hum >= HUM_HIGH || hum <= HUM_LOW);
  bool currentSoilAlert = (soilPercent <= 30);
  bool currentLightAlert = (light <= LIGHT_DARK);
  
  // Temperature alerts
  if (currentTempAlert && !lastTempAlert) {
    String msg = "CRITICAL TEMP: " + String(temp,1) + "°C";
    Serial.println(msg);
    Blynk.logEvent("temp_alert", msg);
    lastTempAlert = true;
  } else if (!currentTempAlert && lastTempAlert) {
    Serial.println("Temperature back to normal");
    lastTempAlert = false;
  }
  
  // Humidity alerts
  if (currentHumAlert && !lastHumAlert) {
    String msg = "CRITICAL HUMIDITY: " + String(hum,0) + "%";
    Serial.println(msg);
    Blynk.logEvent("hum_alert", msg);
    lastHumAlert = true;
  } else if (!currentHumAlert && lastHumAlert) {
    Serial.println("Humidity back to normal");
    lastHumAlert = false;
  }
  
  // Soil alerts
  if (currentSoilAlert && !lastSoilAlert) {
    String msg = "CRITICAL SOIL: " + String(soilPercent) + "% (DRY)";
    Serial.println(msg);
    Blynk.logEvent("soil_alert", msg);
    lastSoilAlert = true;
    digitalWrite(RELAY_PIN, HIGH);
    Serial.println("Water pump ACTIVATED");
  } else if (!currentSoilAlert && lastSoilAlert) {
    Serial.println("Soil moisture normalized");
    lastSoilAlert = false;
    digitalWrite(RELAY_PIN, LOW);
    Serial.println("Water pump DEACTIVATED");
  }
  
  // Light alerts
  if (currentLightAlert && !lastLightAlert) {
    String msg = "CRITICAL LIGHT: " + String(light) + " (TOO DARK)";
    Serial.println(msg);
    Blynk.logEvent("light_alert", msg);
    lastLightAlert = true;
  } else if (!currentLightAlert && lastLightAlert) {
    Serial.println("Light level normalized");
    lastLightAlert = false;
  }
  
  // Control buzzer
  bool anyAlert = currentTempAlert || currentHumAlert || currentSoilAlert || currentLightAlert;
  digitalWrite(BUZZER_PIN, anyAlert ? HIGH : LOW);
  
  // Update display
  updateDisplay(temp, hum, soilPercent, light, anyAlert);
  
  // Send data to Blynk
  Blynk.virtualWrite(V0, temp);
  Blynk.virtualWrite(V1, hum);
  Blynk.virtualWrite(V2, soilPercent);
  Blynk.virtualWrite(V3, light);
}

void updateDisplay(float temp, float hum, int soil, int light, bool alert) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.print(temp, 1);
  lcd.print("C H:");
  lcd.print(hum, 0);
  lcd.print("%");
  
  lcd.setCursor(0, 1);
  lcd.print("S:");
  lcd.print(soil);
  lcd.print("% L:");
  lcd.print(light);
  
  if (alert) {
    lcd.setCursor(15, 0);
    lcd.print("!");
  }
}

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