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

char ssid[] = "nepatronix_2.4";
char pass[] = "CLB269DA03";
const char* serverName = "http://192.168.1.97:8000/basic/recieve-data/";  // Django API endpoint

#define trigPin 26
#define echoPin 27
float duration;
int distance;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println(("Connected to WiFi!!"));
}

void loop() {
  // put your main code here, to run repeatedly:
  distance = readDistance();
  if (WiFi.status() == WL_CONNECTED) {
    sendData(distance);
  } else {
    Serial.println("WiFi Disconnected!");
  }
  delay(1000); // this speeds up the simulation
}

int readDistance() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  return (duration * 0.034) / 2;  // Calculate distance in cm
}

void sendData(int distance) {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;

    http.begin(serverName); // Specify the URL
    http.addHeader("Content-Type", "application/json");  // Specify content-type

    // Create JSON object
    StaticJsonDocument<200> jsonDoc;
    jsonDoc["distance"] = distance;
    String jsonString;
    serializeJson(jsonDoc, jsonString);
    Serial.println(jsonString);

    // Send HTTP POST request
    int httpResponseCode = http.POST(jsonString);

    // Check the response
    if (httpResponseCode > 0) {
      String response = http.getString();
      Serial.println(httpResponseCode);   // Print return code
      Serial.println(response);           // Print response
    } else {
      Serial.print("Error on sending POST: ");
      Serial.println(httpResponseCode);
    }
    Serial.print("Error on sending POST: ");
    Serial.println(httpResponseCode);
    http.end();  // Free resources
  }
}