#include <WiFi.h>
#include <HTTPClient.h>
#include <Wire.h>
#include <RTClib.h>
#include <ESP32Servo.h>
#include <PubSubClient.h>

#define PIN_TRIG 2
#define PIN_ECHO 4

#define LED_RED 32
#define LED_YELLOW 25
#define LED_GREEN 13

const char* ssid = "Wokwi-GUEST";
const char* password = "";
String token = "BBUS-SLh7Ee4Kr65S9F5FZWsLCxxvDaYaL8";
char mqttBroker[] = "stem.ubidots.com";

String DEVICE_LABEL = "esp32_ijal"; // Device Label
String ultraSonicLabel = "ultrasonic";
String servoLabel = "servo";
String ledRedLabel = "led_red";
String ledYellowLabel = "led_yellow";
String ledGreenLabel = "led_green";

const int servoPin = 18;

int led_red, led_yellow, led_green, gate, jarak;

RTC_DS1307 rtc;
Servo servo;
WiFiClient ubidots;
PubSubClient client(ubidots);

void wifiInit();
void sendData();
void callback(char* topic, byte* payload, unsigned int length);
void reconnect();

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

  wifiInit();

  client.setServer(mqttBroker, 1883);
  client.setCallback(callback);

  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);

  pinMode(LED_RED, OUTPUT);
  pinMode(LED_YELLOW, OUTPUT);
  pinMode(LED_GREEN, OUTPUT);

  // Check if the RTC is connected properly
  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

  // Check if the RTC lost power and if so, set the time
  if (!rtc.isrunning()) {
    Serial.println("RTC is NOT running!");
    rtc.adjust(DateTime(2024, 1, 1, 0, 0, 0));  // Set RTC ke waktu awal
  }

  servo.attach(servoPin, 500, 2400);

  reconnect();
  delay(1000);
}

void loop() {
  if (!client.connected()) { // untuk koneksi ke ubidots nya
    reconnect();
  }
  client.loop();

  // Start a new measurement:
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);

  long duration = pulseIn(PIN_ECHO, HIGH, 30000); // Tambahkan timeout 30ms
  float distance_cm = duration / 58.0;
  float distance_in = duration / 148.0;

  jarak = 406 - int(distance_cm);
  Serial.print("Tinggi Air : ");
  Serial.print(jarak);
  Serial.println(" cm");

  if(distance_cm < 150) {
    servo.write(0);
    gate = 0;
    digitalWrite(LED_RED, HIGH);
    led_red = 1;
    digitalWrite(LED_YELLOW, LOW);
    led_yellow = 0;
    digitalWrite(LED_GREEN, LOW);
    led_green = 0;
  } else if(distance_cm < 250) {
    servo.write(180);
    gate = 180;
    digitalWrite(LED_RED, LOW);
    led_red = 0;
    digitalWrite(LED_YELLOW, HIGH);
    led_yellow = 1;
    digitalWrite(LED_GREEN, LOW);
    led_green = 0;
  } else {
    servo.write(180);
    gate = 180;
    digitalWrite(LED_RED, LOW);
    led_red = 0;
    digitalWrite(LED_YELLOW, LOW);
    led_yellow = 0;
    digitalWrite(LED_GREEN, HIGH);
    led_green = 1;
  }

  DateTime now = rtc.now();
  char buffer[20];
  sprintf(buffer, "%04d/%02d/%02d %02d:%02d:%02d", now.year(), now.month(), now.day(), now.hour(), now.minute(), now.second());
  Serial.println(buffer);

  sendData();

  delay(1000);
}

void wifiInit() {
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.println("Waiting for WiFi connection...");
  }
  Serial.println("WiFi connected");
  Serial.print("IP: ");
  Serial.println(WiFi.localIP());
}

void sendData() {
  Serial.println("Sending data to Ubidots...");
  if (client.connect("ESP32", token.c_str(), "")) { // untuk mengirimkan data yang sudah dikumpulkan ke ubidots
    String payload = "{\"" + ultraSonicLabel + "\": " + jarak +
                      ",\"" + servoLabel + "\": "+ gate +
                      ",\"" + ledRedLabel + "\": "+ led_red +
                      ",\"" + ledYellowLabel + "\": "+ led_yellow +
                      ",\"" + ledGreenLabel + "\": "+ led_green +
                      "}";
    client.publish((String("/v1.6/devices/") + DEVICE_LABEL).c_str(), payload.c_str());
    Serial.println("Data sent!");
  } else { // jika koneksi nya gagal, maka ...
    Serial.println("Connection to server failed");
  }
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.println(topic);
  Serial.print("Message from Ubidots: ");
  String message = "";
  for (int i = 0; i < length; i++) {
    message += (char)payload[i];
  }
  Serial.println(message);
}

void reconnect() {
  while (!client.connected()) {
    Serial.println("Attempting MQTT connection...");
    if (client.connect("ESP32", token.c_str(), "")) {
      Serial.println("Connected to MQTT broker");
    } else {
      Serial.print("Failed to connect, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 2 seconds");
      delay(2000);
    }
  }
}