#define BLYNK_TEMPLATE_ID "TMPL3JrllXvsC"
#define BLYNK_TEMPLATE_NAME "Batterylevel"
#define BLYNK_AUTH_TOKEN "fHnbV9ra1HlQGi3GQtI2zNpfQ0fJ_ZBV"

#define BLYNK_PRINT Serial

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

char ssid[] = "Wokwi-GUEST";    //CHANGE TO YOUR OWN WIFI NAME
char pass[] = "";               //CHANGE TO YOUR OWN WIFI PASSWORD

#define POT_PIN 35
// Define the LCD address (check your display documentation)
#define LCD_ADDRESS 0x27
#define LCD_COLS 20 // Adjusted columns to match your display
#define LCD_ROWS 4  // Adjusted rows to match your display

// Create a LiquidCrystal_I2C object
LiquidCrystal_I2C lcd(LCD_ADDRESS, LCD_COLS, LCD_ROWS);

// Define the DHT sensor type and pin
#define DHT_PIN 27 // GPIO pin number connected to the DHT22 sensor
#define DHT_TYPE DHT22

// Initialize the DHT sensor
DHT dht(DHT_PIN, DHT_TYPE);

// Define the battery voltage range (in volts)
const float minVoltage = 3.0; // Minimum voltage of the battery
const float maxVoltage = 4.2; // Maximum voltage of the battery

// Define the maximum range of the EV
const float maxRangeKm = 275.0; // Maximum range in kilometers when the battery is at 100%

// Counter variable to count how many times battery percentage is 100%
int fullChargeCount = 0;
bool isFullyCharged = false; //important
bool showError = false;

char errorText[180] = ""; //important
bool isLifeCycleEnded = false; //important

// Statistics variables for temperature
float totalTemperature = 0;
float averageTemperature = 0;
int temperatureSampleCount = 0;

// Statistics variables for humidity
float totalHumidity = 0;
float averageHumidity = 0;
int humiditySampleCount = 0;

// Statistics variables for battery
float totalBatteryPercentage = 0;
float averageBatteryPercentage = 0;
int batterySampleCount = 0;
int chargeCycles = 0;

// Statistics variables for range
float totalRange = 0;
float averageRange = 0;
int rangeSampleCount = 0;

void setup() {
  // Initialize the LCD display
  lcd.init();
  lcd.backlight();

  // Initialize the DHT sensor
  dht.begin();
  Serial.begin(115200);
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
  pinMode(POT_PIN, INPUT);
}

void loop() {
  Blynk.run();

  float temperature = dht.readTemperature(); //important
  float humidity = dht.readHumidity(); //important
  int potValue = analogRead(POT_PIN);

  float voltage = potValue * (3.3 / 4095.0);
  float batteryPercentage = (voltage / 3.3) * 100; //important
  float remainingKm = (batteryPercentage / 100.0) * maxRangeKm; //important

  // Update temperature statistics
  totalTemperature += temperature;
  temperatureSampleCount++;
  averageTemperature = totalTemperature / temperatureSampleCount; //important

  // Update humidity statistics
  totalHumidity += humidity;
  humiditySampleCount++;
  averageHumidity = totalHumidity / humiditySampleCount; //important

  // Update battery statistics
  totalBatteryPercentage += batteryPercentage;
  batterySampleCount++;
  averageBatteryPercentage = totalBatteryPercentage / batterySampleCount; //important

  // Update range statistics
  totalRange += remainingKm;
  rangeSampleCount++;
  averageRange = totalRange / rangeSampleCount; //important

  Serial.println(averageRange);
  Serial.println(averageBatteryPercentage);
  Serial.println(averageTemperature);
  Serial.println(averageHumidity);


  Blynk.virtualWrite(V0, batteryPercentage);
  Blynk.virtualWrite(V3, remainingKm);
  Blynk.virtualWrite(V2, humidity);
  Blynk.virtualWrite(V1, temperature);

  // Handle error messages
  showError = false;
  if (temperature > 60) {
    lcd.clear();
    lcd.setCursor(0, 0);
    strcpy(errorText, "Temperature too High!"); //important
    lcd.print(errorText);
    showError = true;
  } else if (humidity > 55) {
    lcd.clear();
    lcd.setCursor(0, 0);
    strcpy(errorText, "Humidity too High!");
    lcd.print(errorText);
    showError = true;
  } else if (batteryPercentage == 0) {
    lcd.clear();
    lcd.setCursor(0, 0);
    strcpy(errorText, "No Battery");
    lcd.print(errorText);
    showError = true;
  } else if (batteryPercentage <= 15) {
    lcd.clear();
    lcd.setCursor(0, 0);
    strcpy(errorText, "Low Battery");
    lcd.print(errorText);
    showError = true;
  } else if (batteryPercentage >= 99.5 && batteryPercentage <= 100.5) {
    fullChargeCount++;
    isFullyCharged = true; //important
    strcpy(errorText, "Battery Fully charged!"); //important
    showError = false;
  } else {
    fullChargeCount = 0;
    isFullyCharged = false; //important
    strcpy(errorText, ""); //important
  }

  if (showError) {
    delay(1000); // Keep the error message visible
  } else {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Temp: ");
    lcd.print(temperature);
    lcd.print(" C");
    lcd.setCursor(0, 1);
    lcd.print("Humidity: ");
    lcd.print(humidity);
    lcd.print(" %");
    lcd.setCursor(0, 2);
    lcd.print("Battery: ");
    lcd.print(batteryPercentage);
    lcd.print(" %");
    lcd.setCursor(0, 3);
    lcd.print("Range: ");
    lcd.print(remainingKm);
    lcd.print(" km");
  }

  if (fullChargeCount > 5) {
    lcd.clear();
    lcd.setCursor(0, 0);
    strcpy(errorText, "Life Cycle Ended"); //important
    lcd.print("Life Cycle Ended");
    isLifeCycleEnded = true;
    while (true) {}
  }

  delay(1500);
}