#include <WiFi.h>
#include <esp_now.h>
#include <JQ6500_Serial.h>

// --- MP3 UART PINS ---
#define RX_PIN D7   // ESP receives from MP3 TX
#define TX_PIN D6   // ESP sends to MP3 RX

// --- MP3 SETUP ---
HardwareSerial mp3Serial(1);
JQ6500_Serial mp3(mp3Serial);

// --- DATA STRUCT ---
typedef struct struct_message {
  int track;
} struct_message;

struct_message msg;

// --- ESP-NOW RECEIVE CALLBACK ---
void OnDataRecv(const esp_now_recv_info_t *info,
                const uint8_t *incomingData,
                int len) {

  memcpy(&msg, incomingData, sizeof(msg));

  Serial.print("Received track: ");
  Serial.println(msg.track);

  // Play received track
  mp3.playFileByIndexNumber(msg.track);
}

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

  // --- MP3 INITIALIZATION (DO NOT MODIFY) ---
  mp3Serial.begin(9600, SERIAL_8N1, RX_PIN, TX_PIN);
  delay(3000);

  mp3.reset();
  delay(1000);

  mp3.setSource(MP3_SRC_BUILTIN);
  delay(500);

  mp3.setVolume(30);
  delay(500);

  Serial.println("MP3 Ready");

  // --- ESP-NOW SETUP ---
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();

  if (esp_now_init() != ESP_OK) {
    Serial.println("ESP-NOW init failed");
    return;
  }

  esp_now_register_recv_cb(OnDataRecv);

  Serial.println("Receiver ready");
}

void loop() {
  // nothing required
}