#include <WiFi.h>
#include <HTTPClient.h>
#include <UrlEncode.h>
#include "DHTesp.h"

const int DHT_PIN = 15;
const int redPin = 4;
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const int trigPin = 15;
const int echoPin = 2;
long duration;
int distance;

DHTesp dhtSensor;

//international country code + phone number

String phoneNumber = "+97337722062";
String apiKey = "1298471";

void sendMessage(String message) {

  // Data to send with HTTP POST
  String url = "https://api.callmebot.com/whatsapp.php?phone=" + phoneNumber + "&apikey=" + apiKey + "&text=" + urlEncode(message);
  HTTPClient http;
  http.begin(url);

  // Specify content-type header
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");
  // Send HTTP POST request
  int httpResponseCode = http.POST(url);
  if (httpResponseCode == 200) {
    Serial.print("Message sent successfully");
    digitalWrite (redPin, HIGH);
  }
  else {
    Serial.println("Error sending the message");
    Serial.print("HTTP response code: ");
    Serial.println(httpResponseCode);
  }

  // Free resources
  http.end();
}

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

  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  WiFi.begin(ssid, password);
  Serial.println("Connecting");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());
  pinMode (redPin, OUTPUT);
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input

  // Send Message to WhatsAPP "Add your name + NV number + Class"
  // Example: "Hello From Ebrahim - NV21058 - 12.CCP !"
}

void loop() {
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);

  // Calculate the distance
  distance = (duration*0.034/2)+1;

  // Prints the distance in the Serial Monitor
  Serial.print("Distance (cm): ");
  Serial.println(distance);

  if (distance <= 50) {
    sendMessage(R"('Hello from Sayed Mohammed Mustafa - 12.CCP
      WARNING! Someone enters the class!
      Distance: ')" + String(distance) + "cm");
  }
  delay(3600000);
}
/*
void loop() {
  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  Serial.println("---");
  if (data.temperature > 40) {
    sendMessage("Hello from Sayed Mohammed - NV21060 - 12.CCP WARNING! Temperature is too high! Temperature: " + String(data.temperature, 2) + "°C");
  }
  delay(3600000); // Wait for a new reading from the sensor (DHT22 has ~0.5Hz sample rate)
}
*/