#include <SPI.h>
#include <SD.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>

// Define the I2C address for the LCD
#define I2C_ADDR 0x27
#define LCD_COLUMNS 16
#define LCD_ROWS 2

// Define pin numbers for the sensors
#define DHTPIN 2
#define DHTTYPE DHT22  // Use DHT22 for better accuracy in the simulation
#define TURBIDITY_PIN A0

// Initialize the DHT sensor
DHT dht(DHTPIN, DHTTYPE);

// Initialize the LCD
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_ROWS);

// Chip Select pin for the SD card module
const int chipSelect = 10;

void setup() {
  // Start the serial communication for debugging
  Serial.begin(9600);
  
  // Initialize the LCD
  lcd.begin(LCD_COLUMNS, LCD_ROWS);
  lcd.init();
  lcd.backlight();
  
  // Initialize the DHT sensor
  dht.begin();
  
  // Initialize the SD card
  if (!SD.begin(chipSelect)) {
    Serial.println("Card failed, or not present");
    // don't do anything more:
    return;
  }
  Serial.println("Card initialized.");
  
  // Display initial message
  lcd.setCursor(0, 0);
  lcd.print("Water Mgmt Sys");
  lcd.setCursor(0, 1);
  lcd.print("Initializing...");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Read temperature from the DHT sensor
  float temperature = dht.readTemperature();
  
  // Simulate turbidity value (you can use an analog input or any other method to generate values)
  int turbidityValue = analogRead(TURBIDITY_PIN);
  
  // Check if any reads failed and exit early (to try again)
  if (isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Open a file for writing
  File dataFile = SD.open("datalog.txt", FILE_WRITE);
  
  // If the file is available, write to it:
  if (dataFile) {
    dataFile.print("Temperature: ");
    dataFile.print(temperature);
    dataFile.print(" °C");
    dataFile.print(" | Turbidity: ");
    dataFile.println(turbidityValue);
    dataFile.close();
  } else {
    // If the file isn't open, pop up an error:
    Serial.println("error opening datalog.txt");
  }
  
  // Print the readings to the serial monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C");
  Serial.print(" | Turbidity: ");
  Serial.println(turbidityValue);
  
  // Display the readings on the LCD
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");
  
  lcd.setCursor(0, 1);
  lcd.print("Turb: ");
  lcd.print(turbidityValue);
  
  // Wait a few seconds between measurements
  delay(2000);
}