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

#define BUTTON_PIN 20   // Change to the pin your button is connected to

uint8_t receiverMac[] = {0x10, 0x20, 0xba, 0x76, 0xe1, 0xec}; // Replace with your S3 MAC

typedef struct {
  int angle;
} Message;

Message outgoingData;
bool lastBtn = HIGH;
int currentAngle = 0;

void onSent(const wifi_tx_info_t *info, esp_now_send_status_t status) {
  Serial.print("Send status: ");
  Serial.println(status == ESP_NOW_SEND_SUCCESS ? "OK" : "FAIL");
}

void setup() {
  Serial.begin(115200);
  pinMode(BUTTON_PIN, INPUT_PULLUP);  // use internal pull-up resistor

  WiFi.mode(WIFI_STA);

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

  esp_now_register_send_cb(onSent);

  esp_now_peer_info_t peer = {};
  memcpy(peer.peer_addr, receiverMac, 6);
  peer.channel = 0;
  peer.encrypt = false;

  if (esp_now_add_peer(&peer) != ESP_OK) {
    Serial.println("Failed to add peer");
    return;
  }

  Serial.println("C3 Sender ready");
}

void loop() {
  bool btn = digitalRead(BUTTON_PIN);

  // Detect button press (falling edge)
  if (btn == LOW && lastBtn == HIGH) {
    delay(50);  // simple debounce

    // Toggle angle
    currentAngle = (currentAngle == 0) ? 90 : 0;
    outgoingData.angle = currentAngle;

    Serial.print("Button pressed → sending angle: ");
    Serial.println(currentAngle);

    esp_now_send(receiverMac, (uint8_t*)&outgoingData, sizeof(outgoingData));

    delay(1000); // to avoid double measurements
  }

  lastBtn = btn;

}