#include <LiquidCrystal.h>
#include <SPI.h>
#include <SD.h>

const int potPin = A0;
const int buzzerPin = 8;
const int chipSelect = 10;

LiquidCrystal lcd(7, 6, 5, 4, 3, 2);

void setup() {
  lcd.begin(16, 2);
  pinMode(buzzerPin, OUTPUT);
  Serial.begin(9600);

  // SD card initialization
  if (!SD.begin(chipSelect)) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("SD init failed!");
    Serial.println("SD card not found.");
    return;  // Return was used instead of while(1) to avoid crashing in the simulation.
  }

  lcd.setCursor(0, 0);
  lcd.print("SD Ready");
  Serial.println("SD card is ready.");
  delay(1000);
  lcd.clear();

  // Write CSV header (if file is newly created)
  if (!SD.exists("wind_data.csv")) {
    File dataFile = SD.open("wind_data.csv", FILE_WRITE);
    if (dataFile) {
      dataFile.println("Time(ms),WindSpeed(km/h)");
      dataFile.close();
    }
  }
}

void loop() {
  int potValue = analogRead(potPin);
  int windSpeed = map(potValue, 0, 1023, 0, 100);

  // LCD Update
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Wind Speed:");
  lcd.setCursor(0, 1);
  lcd.print(windSpeed);
  lcd.print(" km/h");

  // Buzzer
  if (windSpeed >= 70) {
    tone(buzzerPin, 1000);  // Alarm sound 
  } else {
    noTone(buzzerPin);
  }

  // Write CSV formatted output to serial monitor
  Serial.print(millis());
  Serial.print(",");
  Serial.println(windSpeed);

  // Writing data to SD card
  File dataFile = SD.open("wind_data.csv", FILE_WRITE);
  if (dataFile) {
    dataFile.print(millis());
    dataFile.print(",");
    dataFile.println(windSpeed);
    dataFile.close();
    Serial.println("Data has been written.");
  } else {
    Serial.println("Data could not be written. (Expected behavior in simulation environment)");
  }

  delay(1000);
}