#include <WiFi.h>
#include <HTTPClient.h>
#include <LiquidCrystal_I2C.h>
#include "HX711.h"
#include <ESP32Servo.h>
#include <Arduino_JSON.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char* serverName = "https://pembelianberasotomatisus-default-rtdb.firebaseio.com/sensor.json";
//const char* serverName2 = "https://pembelianberasotomatisus-default-rtdb.firebaseio.com/actuator.json";

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4
#define ECHO_PIN 15
#define TRIG_PIN 2
#define tarebutton 19 
#define LOADCELL_DOUT_PIN 27  //2
#define LOADCELL_SCK_PIN 14 //4

HX711 scale;
Servo myservo;
LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 20, 4);

unsigned long myoffset,refval;
int pos = 0; 
int statusbeli = 0;
int beratbeli = 0;
String myjson;
//String nilais;
int nilai;

void setup() {
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(tarebutton, INPUT);
  myservo.attach(4); 
  LCD.init();
  LCD.backlight();
  byte buttonstat;

  Serial.println("Initializing the scale");
  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
  Serial.println("pastikan beban tidak ada (0 kg) lalu tekan tombol");
  do
  {
    buttonstat=digitalRead(tarebutton);
  }
  while(buttonstat==HIGH);
  delay(300);
  Serial.println("tunggu....");
  myoffset=scale.read_average(20);
  Serial.print("nilai offset: ");
  Serial.println(myoffset);
  Serial.println("berikan beban standar (1 kg) lalu tekan tombol");
  do
  {
    buttonstat=digitalRead(tarebutton);
  }
  while(buttonstat==HIGH);
  delay(300);
  Serial.println("tunggu....");
  refval=scale.read_average(20);
  Serial.print("nilai referensi: ");
  Serial.println(refval);

  WiFi.begin(ssid, password);
  Serial.println("Connecting");
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
    LCD.setCursor(0, 0);
    LCD.print("Menghubungkan...");

  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP()); 
  Serial.println("Timer set to 5 seconds (timerDelay variable), it will take 5 seconds before publishing the first reading.");
}

float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}

void loop() {
  unsigned long adcave;
  float distance = readDistanceCM();
  adcave=scale.read_average(1);
  float berat=(adcave-myoffset)/(refval-myoffset); 
  Serial.println("Berat = "+String(berat) +" grams");
  Serial.print("Measured distance: ");
  Serial.println(distance,1);
  //Serial.print("Scale: ");
  //Serial.println(berat,1);
  
  LCD.setCursor(0, 0);
  LCD.print("Kapasitas:");
  LCD.setCursor(0, 1);
  LCD.print((100-distance),1);
  LCD.setCursor(4, 1);
  LCD.print("%");


 //ini utk menulis ke firebase
myjson = "{\"beratbeli\": " + String(beratbeli) + ", \"distance\": " + String(distance) + ", \"statusbeli\": " + String(statusbeli) + "}";

  if(WiFi.status()== WL_CONNECTED)
  {
    HTTPClient http;
    http.begin(serverName);
    int httpResponseCode = http.PUT(myjson);
    LCD.setCursor(0, 2);
    LCD.print("Mengirim Data...");
    if (httpResponseCode>0)
    {
      Serial.print("HTTP Response code: ");
      Serial.println(httpResponseCode);
      String payload = http.getString();
      Serial.println(payload);
    }
    else
    {
      Serial.print("Error code: ");
      Serial.println(httpResponseCode);
    }
    http.end();
  }
  else
  {
    Serial.println("WiFi Disconnected");
  }
while (statusbeli==0){
// ini utk membaca dari firebase
  if(WiFi.status()== WL_CONNECTED)
  {
    int httpResponseCode = 0;
    HTTPClient http;
    http.begin(serverName);
    LCD.setCursor(0, 2);
    LCD.print("Menerima Data...");
    while(httpResponseCode<=0){
    http.begin(serverName);
    httpResponseCode = http.GET();
    Serial.print("Respon code baca: ");
    Serial.println(httpResponseCode);
    LCD.setCursor(0, 2);
    LCD.print("Menerima Gagal");
    }
    if (httpResponseCode>0)
    { LCD.setCursor(0, 2);
      LCD.print("Menerima Berhasil");
      String payload = http.getString();
      Serial.println(payload);
      JSONVar myObject = JSON.parse(payload);
      if (JSON.typeof(myObject) == "undefined")
      {
        Serial.println("Parsing input failed!");
        return;
      }
      JSONVar keys = myObject.keys();
      Serial.print("keys:   ");
      Serial.println(keys);
      JSONVar value = myObject[keys[2]];
      String nilais = value;
      nilai = nilais.toInt();
      statusbeli = nilai;
      Serial.print("statusbeli:   ");
      Serial.println(statusbeli);

      value = myObject[keys[0]];
      Serial.print("value:   ");
      Serial.println(value);
      String nilais2 = value;
      nilai = nilais2.toInt();
      Serial.print("beratbeli:   ");
      Serial.println(nilai);
      if(statusbeli==1)
     {
      beratbeli =nilai;
      Serial.println(beratbeli);
      LCD.setCursor(0, 2);
      LCD.print("Pembelian");
      LCD.setCursor(11, 2);
      LCD.print(nilai);
      }
      else
      {
      beratbeli = 0;
      Serial.println(beratbeli);
      }

    }
    else
    {
      Serial.print("Error code: ");
      Serial.println(httpResponseCode);
      Serial.println("Proses diulang");
    }
    http.end();
  }
  else
  {
    Serial.println("WiFi Disconnected");
  }
}
if(statusbeli == 1){

  for (pos = 0; pos <= 180; pos += 1) {
    myservo.write(pos);             
    delay(10);                      
  }
while(berat<= beratbeli){
  berat = scale.get_units()/420;
  
  Serial.print("Berat Pembelian: ");
  Serial.println(berat,1);
  LCD.setCursor(0, 0);
  LCD.print("Berat : ");
  LCD.setCursor(0, 1);
  LCD.print(berat);
  LCD.setCursor(0, 2);
  LCD.print("Pembelian Proses");
}
for (pos = 180; pos >= 0; pos -= 1) { 
    myservo.write(pos);              
    delay(10);                      
  }
while(berat!= 0){
  berat = scale.get_units()/420;
  Serial.print("Berat Pembelian: ");
  Serial.println(berat,1);
  LCD.setCursor(0, 0);
  LCD.print("Berat : ");
  LCD.setCursor(0, 1);
  LCD.print(berat);
  LCD.setCursor(0, 2);
  LCD.print("Pembelian Selesai");
  LCD.setCursor(0, 3);
  LCD.print("Ambil Beras Anda");

}
  LCD.clear();
  statusbeli =0;
  beratbeli = 0;
} 



 // delay(100);
}