#include <HTTPClient.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <LiquidCrystal_I2C.h>

const char ssid[] = "Wokwi-GUEST";
const char password[] = "";

String apiDistance = "https://api.thingspeak.com/channels/2024961/feeds.json?api_key=6G3PY5O1NAGXCNEZ&results=1";

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int GRE = 25;
const int RED = 33;
const int Buzzer = 2;

bool gerakan = 0;
int distance = 0;

void setup() {
  lcd.init();
  lcd.backlight();
  pinMode(RED, OUTPUT);
  pinMode(GRE, OUTPUT);
  pinMode(Buzzer, OUTPUT);

  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

   WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED)
    {
        delay(500);
        Serial.println("-");
    }

    Serial.println("");
    Serial.print("ESP 32 Connected");
    Serial.println(WiFi.localIP());
}

void loop() {
    
    // put your main code here, to run repeatedly:
    getDistance();
    Serial.println("");
    Serial.print("Jarak: ");
    Serial.println(distance);

    Serial.println("");
    Serial.print("Gerakan: ");
    Serial.println(gerakan);
    
    if(gerakan){
    lcd.setCursor(0,1);
    lcd.print("Ada Gerakan!");
    digitalWrite(RED, HIGH);
    tone(Buzzer, 250);
    delay(1000);
    }else{
    noTone(Buzzer);
    digitalWrite(RED, LOW);
    }
    if(distance < 100)
    {
         digitalWrite(RED, HIGH);
         digitalWrite(GRE, LOW);
         tone(Buzzer, 250);

         lcd.clear();
         lcd.setCursor(0, 0);
            
         lcd.print("Jarak : ");
         lcd.print(distance);
         lcd.print(" cm");
         lcd.setCursor(0, 1);
         lcd.print("Stat: ");
         lcd.print("Terdeteksi");
     }
    else
    {
         digitalWrite(RED, LOW);
         digitalWrite(GRE, HIGH);
         lcd.clear();
         lcd.setCursor(0, 0);
         lcd.print("Jarak : ");
         lcd.print(distance);
         lcd.print(" cm");
         lcd.setCursor(0, 1);
         lcd.print("Stat: ");
         lcd.print("Tdk Terdeteksi");
     }
     delay(500);
}

void getDistance()
{
    HTTPClient http;
    http.begin(apiDistance);
    int httpCode = http.GET();
    if (httpCode > 0)
    {
        String payload = http.getString();
        int index1 = payload.indexOf("[");
        int index2 = payload.indexOf("]");
        String data = payload.substring(index1 + 1, index2);
        int index3 = data.indexOf("field1");
        int index4 = data.indexOf("field2");
        int index5 = 80;
        String dis = data.substring(index3 + 9, index4 - 2);
        String ger = data.substring(index4 + 9, index5 - 2);
        gerakan = ger.toInt();
        distance = dis.toFloat();
    }
    http.end();
}