#define BLYNK_TEMPLATE_ID "TMPL3CBjPyEa5"
#define BLYNK_TEMPLATE_NAME "Battery status and Temp monitor and SMS alert"
#define BLYNK_AUTH_TOKEN "D6YDE5iXtmQNZ3NFwsDrj745KajUwVmD"

#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>

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

// Display setup
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
LiquidCrystal_I2C lcd(0x27, 16, 2);

// DHT setup
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Pin assignments
#define BUZZER_PIN 5
#define RED_LED 14
#define YELLOW_LED 13
#define GREEN_LED 12
#define BATTERY_PIN 34

BlynkTimer timer;

void notifyBatteryStatus() {
  int batteryRaw = analogRead(BATTERY_PIN);
  Serial.print("Battery Raw Value: ");
  Serial.println(batteryRaw);

  if (batteryRaw <= 900) {
    Serial.println("Low battery detected");
    Blynk.logEvent("low_battery", "Low battery, please turn on the power supply");
  } else if (batteryRaw >= 3700) {
    Serial.println("Battery full");
    Blynk.logEvent("full_battery", "Battery is full, please turn off the power supply");
  }
}

void setup() {
  Serial.begin(9600);
  Blynk.begin(auth, ssid, pass);

  // Initialize devices
  dht.begin();
  lcd.init();
  lcd.backlight();
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(RED_LED, OUTPUT);
  pinMode(YELLOW_LED, OUTPUT);
  pinMode(GREEN_LED, OUTPUT);

  // OLED init
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 OLED failed to initialize"));
    while (true);
  }

  oled.clearDisplay();
  oled.setTextSize(2);
  oled.setTextColor(WHITE);
  oled.setCursor(15, 30);
  oled.println("Hello!");
  oled.display();
  delay(2000);

  // Setup battery status checking
  timer.setInterval(10000L, notifyBatteryStatus);
}

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

  float H = dht.readHumidity();
  float T = dht.readTemperature();

  if (isnan(H) || isnan(T)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.print("Humidity: ");
  Serial.print(H);
  Serial.print(" %, Temp: ");
  Serial.print(T);
  Serial.println(" *C");

  // Buzzer and LED logic
  if (H >= 70 && T >= 30) {
    digitalWrite(RED_LED, HIGH);
    digitalWrite(YELLOW_LED, LOW);
    digitalWrite(GREEN_LED, LOW);
    lcd.setCursor(0, 0);
    lcd.print("   Too warm!    ");
    lcd.setCursor(0, 1);
    lcd.print("   Cool down!   ");
    tone(BUZZER_PIN, 1000, 200);
  } else if (H < 70 && T >= 30) {
    digitalWrite(RED_LED, LOW);
    digitalWrite(YELLOW_LED, HIGH);
    digitalWrite(GREEN_LED, LOW);
    lcd.setCursor(0, 0);
    lcd.print("  Temp too high ");
    lcd.setCursor(0, 1);
    lcd.print("  Be cautious!  ");
    tone(BUZZER_PIN, 800, 200);
  } else if (H >= 70 && T < 30) {
    digitalWrite(RED_LED, LOW);
    digitalWrite(YELLOW_LED, HIGH);
    digitalWrite(GREEN_LED, LOW);
    lcd.setCursor(0, 0);
    lcd.print(" Humidity high  ");
    lcd.setCursor(0, 1);
    lcd.print("  Be cautious!  ");
    tone(BUZZER_PIN, 800, 200);
  } else {
    digitalWrite(RED_LED, LOW);
    digitalWrite(YELLOW_LED, LOW);
    digitalWrite(GREEN_LED, HIGH);
    lcd.setCursor(0, 0);
    lcd.print(" All is normal  ");
    lcd.setCursor(0, 1);
    lcd.print("  Stay happy :) ");
    noTone(BUZZER_PIN);
  }

  // Battery level reading
  int batteryRaw = analogRead(BATTERY_PIN);
  int batteryPercent = map(batteryRaw, 0, 4095, 0, 100);

  // Display on OLED
  oled.clearDisplay();
  oled.setTextSize(2);
  oled.setCursor(0, 0);
  oled.print("Battery:");
  oled.setCursor(20, 30);
  oled.print(batteryPercent);
  oled.print("%");
  oled.display();

  // Send to Blynk
  Blynk.virtualWrite(V1, H);
  Blynk.virtualWrite(V2, batteryPercent);
  Blynk.virtualWrite(V3, T);

  delay(1000);
}