#include <WiFi.h>
#include <HTTPClient.h>
#include "base64.h"  // Include base64 library

// WiFi credentials
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// Twilio credentials
const String account_sid = "ACc5fe505851407b66a3e952ab1859dbbb";
const String auth_token = "25498cba6a2075bf2dc21ef4d7d36e60";
const String twilio_phone_number = "whatsapp:+14155238886";  // Twilio WhatsApp Sandbox number

// Destination WhatsApp number
const String destination_number = "whatsapp:+6285298601434";  // WhatsApp number to send notifications

// Define the GPIO pin for push button and buzzer
const int buttonPin = 12;    // GPIO2 (D4) for push button
const int buzzerPin = 4;    // GPIO5 (D5) for buzzer

void setup() {
  Serial.begin(115200);
  
  // Initialize push button and buzzer pins
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(buzzerPin, OUTPUT);
  
  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi...");
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting...");
  }
  Serial.println("Connected to WiFi");

  // Print ESP32 Local IP Address
  Serial.println(WiFi.localIP());
}

void loop() {
  // Check if push button is pressed
  if (digitalRead(buttonPin) == LOW) {
    // Button pressed, send WhatsApp notification and activate buzzer
    sendWhatsAppNotification("Pintu Panel Terbuka");
    Serial.println("send WA");
    activateBuzzer();
    
    // Wait for button release
    while (digitalRead(buttonPin) == LOW) {
      delay(100); // Wait for button release
    }
    
    // Send standby notification when button is released
    sendWhatsAppNotification("Panel Standby");
  }
}

// Function to send WhatsApp notification via Twilio
void sendWhatsAppNotification(String message) {
  HTTPClient http;

  // Construct the URL for Twilio API
  String url = "https://api.twilio.com/2010-04-01/Accounts/";
  url += account_sid;
  url += "/Messages.json";

  // HTTP Basic Authentication
  String auth = account_sid + ":" + auth_token;
  String base64_auth = base64::encode((const unsigned char*)auth.c_str(), auth.length());  // Encode auth credentials to Base64

  // Construct the message body
  String body = "To=" + destination_number;
  body += "&From=" + twilio_phone_number;
  body += "&Body=" + message;

  // Send the HTTP POST request
  http.begin(url.c_str());
  http.addHeader("Authorization", "Basic " + base64_auth);
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");

  int httpResponseCode = http.POST(body);

  // Check for successful HTTP request
  if (httpResponseCode > 0) {
    Serial.print("Twilio API success, HTTP Response code: ");
    Serial.println(httpResponseCode);
  } else {
    Serial.print("Twilio API request failed, HTTP Response code: ");
    Serial.println(httpResponseCode);
  }

  http.end();
}

// Function to activate the buzzer
void activateBuzzer() {
  digitalWrite(buzzerPin, HIGH);   // Turn buzzer ON
  delay(1000);                     // Buzzer active for 1 second
  digitalWrite(buzzerPin, LOW);    // Turn buzzer OFF
}