#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
#include <Ultrasonic.h>

const char* ssid = "YOUR_SSID";
const char* password = "YOUR_WIFI_PASSWORD";

// Wowki details
const char* wowkiServer = "http://api.wowki.io/v1/device";
const char* deviceId = "YOUR_DEVICE_ID";
const char* apiKey = "YOUR_API_KEY";

// Twilio details
const char* twilioAccountSid = "YOUR_TWILIO_ACCOUNT_SID";
const char* twilioAuthToken = "YOUR_TWILIO_AUTH_TOKEN";
const char* twilioPhoneNumber = "YOUR_TWILIO_PHONE_NUMBER";
const char* recipientPhoneNumber = "RECIPIENT_PHONE_NUMBER";

// Ultrasonic sensor pins
const int triggerPin = 23; // GPIO pin connected to the sensor's trigger pin
const int echoPin = 22;    // GPIO pin connected to the sensor's echo pin
Ultrasonic ultrasonic(triggerPin, echoPin);

// LED indicator pin
const int ledPin = 21; // GPIO pin connected to the LED

// Water level threshold (in centimeters)
const int waterLevelThreshold = 10;

bool alertSent = false;

void setup() {
  Serial.begin(115200);
  pinMode(ledPin, OUTPUT);
  
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi...");
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println(" connected");
}

void loop() {
  if (WiFi.status() == WL_CONNECTED) {
    float distance = ultrasonic.read(CM);

    if (distance <= waterLevelThreshold) {
      if (!alertSent) {
        Serial.println("Water level exceeded threshold!");
        sendSMSAlert();
        digitalWrite(ledPin, HIGH); // Turn on LED
        alertSent = true;
      }
    } else {
      digitalWrite(ledPin, LOW); // Turn off LED
      alertSent = false;
    }
  } else {
    Serial.println("WiFi not connected");
    // Attempt to reconnect to WiFi
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
      delay(1000);
      Serial.print(".");
    }
    Serial.println(" reconnected");
  }
  
  delay(2000); // Check water level every 2 seconds
}

void sendSMSAlert() {
  HTTPClient http;
  String url = "https://api.twilio.com/2010-04-01/Accounts/" + String(twilioAccountSid) + "/Messages.json";
  http.begin(url);
  http.setAuthorization(twilioAccountSid, twilioAuthToken);
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");

  String message = "To=" + String(recipientPhoneNumber) +
                   "&From=" + String(twilioPhoneNumber) +
                   "&Body=Water level exceeded threshold!";

  int httpResponseCode = http.POST(message);

  if (httpResponseCode > 0) {
    String payload = http.getString();
    Serial.print("SMS alert sent! Response code: ");
    Serial.println(httpResponseCode);
    Serial.println(payload);
  } else {
    Serial.print("Error sending SMS alert. HTTP error code: ");
    Serial.println(httpResponseCode);
  }

  http.end();
}