#include <SPI.h>
#include <SD.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET    -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define BUZZER_PIN 2
#define SD_CS_PIN 10 // SD Card CS Pin
#define OLED_I2C_ADDRESS 0x3C // Typical I2C address for SSD1306

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  // Initialisierung der seriellen Kommunikation
  Serial.begin(9600);

  // Überprüfung der I2C-Verbindung
  Wire.begin();
  Serial.println("I2C scanner. Scanning ...");
  byte count = 0;
  
  for (byte i = 8; i < 120; i++) {
    Wire.beginTransmission(i);
    if (Wire.endTransmission() == 0) {
      Serial.print("Found address: ");
      Serial.print(i, DEC);
      Serial.print(" (0x");
      Serial.print(i, HEX);
      Serial.println(")");
      count++;
    }
  }
  Serial.print("Found ");
  Serial.print(count, DEC);
  Serial.println(" device(s).");
  
  // Initialisierung des OLED-Displays
  if (!display.begin(SSD1306_SWITCHCAPVCC, OLED_I2C_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Endlosschleife
  }
  display.display();
  delay(2000);
  display.clearDisplay();
  Serial.println("OLED initialized successfully.");

  // Initialisierung der SD-Karte
  if (!SD.begin(SD_CS_PIN)) {
    Serial.println("SD Card initialization failed!");
    display.setTextSize(1);
    display.setTextColor(SSD1306_WHITE);
    display.setCursor(0, 0);
    display.println("SD init failed!");
    display.display();
    return;
  }
  Serial.println("SD Card initialized.");
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println("SD initialized!");
  display.display();

  // Speichern von Daten auf der SD-Karte
  File dataFile = SD.open("datalog.txt", FILE_WRITE);
  if (dataFile) {
    dataFile.println("Log entry");
    dataFile.close();
    Serial.println("Data written to SD.");
    display.setCursor(0, 10);
    display.println("Data written to SD");
    display.display();
  } else {
    Serial.println("Error opening datalog.txt");
    display.setCursor(0, 10);
    display.println("Error opening datalog.txt");
    display.display();
  }

  // Buzzer Testton
  pinMode(BUZZER_PIN, OUTPUT);
  tone(BUZZER_PIN, 1000); // 1kHz Ton
  delay(1000);
  noTone(BUZZER_PIN);

  // Abschließende Meldung auf dem Display
  display.setCursor(0, 20);
  display.println("Setup complete!");
  display.display();
}

void loop() {
  // Hier könnte der Code für die Hauptlogik hinzugefügt werden.
}