#include <ESP8266WiFi.h>
#include <WiFiClientSecure.h>
#include <SpotifyArduino.h>
#include <ArduinoJson.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// --- KONFIGURATION ---
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define SCREEN_ADDRESS 0x3C

const char* ssid     = "Wayne Manor";
const char* password = "einfach10zeichen!";

// Spotify Credentials
char clientId[] = "510f19fec68e42f39aad137b7666433f";
char clientSecret[] = "f13ea80ae8d641a0a449e84cbac7efde"; 
char refreshToken[] = "AQB5Orf0ymkJabrduB8uxYgtrwoUrrY6Y5upjoiyyQm7pklhFSzWuqX-fdLUZprQjpZ17seJja0wuHYM0bGPCUas22jcla-evEqu6PhtJkLRealUn8L9w2D8TZlijxfON0I";

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
WiFiClientSecure client;
SpotifyArduino spotify(client, clientId, clientSecret, refreshToken);

// Globale Variablen
char globalScrollText[256] = "Warte auf Spotify...";
int16_t scrollPos = SCREEN_WIDTH;
unsigned long lastSpotifyUpdate = 0;
const unsigned long spotifyInterval = 30000; // Alle 5 Sek. prüfen

// Hilfsvariable zur Berechnung der Textbreite
int16_t textWidth = 0;

void printSongDetails(CurrentlyPlaying currentlyPlaying) {
  String track = String(currentlyPlaying.trackName);
  String artist = String(currentlyPlaying.artists[0].artistName);
  snprintf(globalScrollText, sizeof(globalScrollText), "+++ %s - by %s +++ ", track.c_str(), artist.c_str());
  // Breite neu berechnen (TextSize 2 -> 12 Pixel pro Zeichen)
  textWidth = strlen(globalScrollText) * 12; 
}

void updateDisplay() {
  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);
  display.setTextWrap(false); 

  // Laufschrift anzeigen
  display.setTextSize(2);
  display.setCursor(scrollPos, 20); // Mittig platziert
  display.print(globalScrollText);
  display.display();

  // Scrollen
  scrollPos -= 3; // Erhöhe für schnelleres Scrollen
  if (scrollPos < -textWidth && textWidth > 0) {
    scrollPos = SCREEN_WIDTH;
  }
}

void setup() {
  Serial.begin(115200);

  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    for(;;);
  }

  display.clearDisplay();
  display.setTextSize(1);
  display.setCursor(0,10);
  display.print("WiFi Connecting...");
  display.display();

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }

  client.setInsecure(); 
  
  display.clearDisplay();
  display.setCursor(0,10);
  display.print("Spotify Online");
  display.display();
  delay(1000);
}

void loop() {
  // Spotify Abfrage
  if (millis() - lastSpotifyUpdate > spotifyInterval) {
    // Dieser Aufruf blockiert leider kurzzeitig die CPU
    int status = spotify.getCurrentlyPlaying(printSongDetails, "DE");
    if (status == 204) {
      snprintf(globalScrollText, sizeof(globalScrollText), "Keine Musik... ");
      textWidth = strlen(globalScrollText) * 12;
    }
    lastSpotifyUpdate = millis();
  }

  // Display aktualisieren
  updateDisplay();

  delay(20); 
}