#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Base64.h>  // Pastikan library Base64 terpasang

// Konfigurasi LCD I2C
LiquidCrystal_I2C lcd(0x27, 16, 2); // Alamat I2C, 16 kolom, 2 baris

// Koneksi Wi-Fi
const char* ssid = "Wokwi-GUEST";        
const char* password = "";               

// Konfigurasi Spotify API
const String client_id = "018684d321754891b8df31365e37dcca"; 
const String client_secret = "b7d2899ef59e4757a86b5539f65f1aee"; 
const String redirect_uri = "http://localhost/callback"; 
const String authorization_code = "AQBCDCRGw1rSLeF7FgGuW8Sy61cKIhWyQaDwL_2fNw5Gpsu8TUY0dpOab9rTLEZh-SdkpVR2IjYeVoyYjqQnwpXDKGp5St1fgOwFN0kRwT3UR638B65Na1EFsyWbOG7Nd3whpd2o0BXcQyavnmpzC-aSFxvpXreD1uTlrNlLh7dwrH-fY5473bAiNI7JkOa8zJTw9eBUPiK8SA
"; 
String access_token = "";
String refresh_token = "";

// Endpoint API Spotify
const String token_url = "https://accounts.spotify.com/api/token";
const String api_url = "https://api.spotify.com/v1/me/player/currently-playing";

// Fungsi untuk meng-encode Base64
String encodeBase64(String input) {
  char inputBuffer[input.length() + 1];
  input.toCharArray(inputBuffer, input.length() + 1);

  char encoded[100]; // Buffer untuk hasil encode (sesuaikan jika input lebih panjang)
  int len = Base64.encode(encoded, inputBuffer, input.length());

  return String(encoded).substring(0, len);
}

// Fungsi untuk mendapatkan Access Token dari Authorization Code
void getAccessToken() {
  HTTPClient http;
  http.begin(token_url);

  // Header untuk Basic Authorization
  String credentials = client_id + ":" + client_secret;
  String encodedCredentials = encodeBase64(credentials);
  String auth = "Basic " + encodedCredentials;

  http.addHeader("Authorization", auth);
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");

  // Body request
  String body = "grant_type=authorization_code&code=" + authorization_code + "&redirect_uri=" + redirect_uri;

  int httpCode = http.POST(body);
  String response = http.getString();

  if (httpCode == 200) {
    StaticJsonDocument<512> doc;
    deserializeJson(doc, response);

    access_token = doc["access_token"].as<String>();
    refresh_token = doc["refresh_token"].as<String>();
  }

  http.end();
}

// Fungsi untuk Refresh Access Token
void refreshAccessToken() {
  HTTPClient http;
  http.begin(token_url);

  String credentials = client_id + ":" + client_secret;
  String encodedCredentials = encodeBase64(credentials);
  String auth = "Basic " + encodedCredentials;

  http.addHeader("Authorization", auth);
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");

  String body = "grant_type=refresh_token&refresh_token=" + refresh_token;

  int httpCode = http.POST(body);
  String response = http.getString();

  if (httpCode == 200) {
    StaticJsonDocument<512> doc;
    deserializeJson(doc, response);

    access_token = doc["access_token"].as<String>();
  }

  http.end();
}

// Fungsi untuk mendapatkan lagu yang sedang diputar
String getCurrentTrack() {
  HTTPClient http;
  http.begin(api_url);
  http.addHeader("Authorization", "Bearer " + access_token);

  int httpCode = http.GET();
  String response = http.getString();

  if (httpCode == 200) {
    StaticJsonDocument<1024> doc;
    deserializeJson(doc, response);

    String songName = doc["item"]["name"].as<String>();
    String artistName = doc["item"]["artists"][0]["name"].as<String>();
    return songName + " - " + artistName;
  } else if (httpCode == 401) {
    refreshAccessToken();
    return "Refreshing token...";
  } else if (httpCode == 204) {
    return "No song playing";
  }

  return "Error fetching track";
}

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

  lcd.begin(16, 2);
  lcd.backlight();
  lcd.print("Connecting WiFi");

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
  }

  lcd.clear();
  lcd.print("Fetching token...");
  getAccessToken();
}

void loop() {
  String currentTrack = getCurrentTrack();

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(currentTrack.substring(0, 16));
  lcd.setCursor(0, 1);
  if (currentTrack.length() > 16) {
    lcd.print(currentTrack.substring(16, 32));
  }

  delay(10000);
}