/*#define BLYNK_TEMPLATE_ID "TMPL33PSswMW9"
#define BLYNK_TEMPLATE_NAME "Greenovative  Bin"
#define BLYNK_AUTH_TOKEN "3aQytG-wW1ZqFYwbStB4PPfTJ76mJXcy"*/



#include <Arduino.h>
#include <ESP32Servo.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <HX711.h>
/*#include <WiFi.h>
#include <BlynkSimpleEsp32.h>*/

// -------- WiFi + Blynk --------

/*char auth[] = "3aQytG-wW1ZqFYwbStB4PPfTJ76mJXcy";
char ssid[] = "Wokwi-GUEST";
char pass[] = "";*/

// -------- Pin Definitions --------
const int trigPin = 5;
const int echoPin = 18;
const int moisturePin = 34;
const int gasPin = 32;
const int hxDtPin = 19;
const int hxSckPin = 23;
const int servoPin = 25;
const int servoPin1 = 26;

// -------- Thresholds --------
const int AIR_VALUE   = 4095;
const int WATER_VALUE = 1200;
const int MOISTURE_THRESHOLD = 30;
const float WEIGHT_THRESHOLD = 100;
const int GAS_THRESHOLD = 300;
const int PERSON_DISTANCE = 100;      
const float MAX_CAPACITY = 50000;     

const int openAngle  = 180;  
const int closeAngle = 0;    

// -------- Objects --------
LiquidCrystal_I2C lcd(0x27, 16, 2);
HX711 scale;
Servo sorterServo;
Servo lidServo;

// -------- Running Totals --------
float totalWeight = 0.0;  
float lastWeight = 0.0;   
unsigned long lidTimer = 0;
bool lidOpen = false;

// -------- Blynk Timer --------
/*BlynkTimer timer;

void sendWeightToBlynk() {
  // Send total weight in KG
  Blynk.virtualWrite(V2, totalWeight / 1000.0);
}
*/
void setup() {
  Serial.begin(115200);

  // Blynk + WiFi
  Blynk.begin(auth, ssid, pass);

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // HX711
  scale.begin(hxDtPin, hxSckPin);
  scale.set_scale(0.379);   //  Calibration factor
  scale.tare();

  // LCD
  lcd.init();
  lcd.backlight();
  lcd.print(" Smart Bin Ready ");
  delay(1500);
  lcd.clear();

  // Servos
  lidServo.attach(servoPin1);
  lidServo.write(closeAngle); 
  sorterServo.attach(servoPin, 500, 2400);
  sorterServo.write(90);

  // Send weight every 2 seconds
  timer.setInterval(2000L, sendWeightToBlynk);
}

void loop() {
 /* Blynk.run();
  timer.run();*/

  // ---- Person detection ----
  digitalWrite(trigPin, LOW); delayMicroseconds(2);
  digitalWrite(trigPin, HIGH); delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  long duration = pulseIn(echoPin, HIGH, 30000);
  float distance = duration * 0.034 / 2.0;

  if (distance > 0 && distance < PERSON_DISTANCE && !lidOpen && totalWeight < MAX_CAPACITY) {
    lidServo.write(openAngle);
    lidOpen = true;
    lidTimer = millis();
    lcd.clear();
    lcd.print("Person Detected");
  }

  if (lidOpen && millis() - lidTimer > 3000) {
    lidServo.write(closeAngle);
    lidOpen = false;
    delay(500);
  }

  if (totalWeight >= MAX_CAPACITY) {
    lcd.setCursor(0, 0);
    lcd.print("SORRY: BIN FULL");
    return;
  }

  // ---- Sensor readings ----
  int rawMoisture = analogRead(moisturePin);
  int moisturePercent = map(rawMoisture, WATER_VALUE, AIR_VALUE, 100, 0);
  moisturePercent = constrain(moisturePercent, 0, 100);

  int gasValue = analogRead(gasPin);
  float currentWeight = 0;

  if (scale.is_ready()) {
    currentWeight = scale.get_units();
  }

  float weightDiff = currentWeight - lastWeight;
  if (weightDiff >= WEIGHT_THRESHOLD) {
    totalWeight += weightDiff;
    lastWeight = currentWeight;
  }

  // ---- Material classification ----
  String material = "Unknown";
  int servoAngle = 90;

  if ((moisturePercent >= MOISTURE_THRESHOLD) &&
      (weightDiff >= WEIGHT_THRESHOLD) &&
      (gasValue >= GAS_THRESHOLD)) {
    material = "Organic";  servoAngle = 0;
  }
  else if (weightDiff > 0 && moisturePercent < MOISTURE_THRESHOLD) {
    material = "Dry";      servoAngle = 180;
  }
  else if (weightDiff > 0 && gasValue < GAS_THRESHOLD) {
    material = "Metal";    servoAngle = 45;
  }
  else {
    material = "No Waste"; servoAngle = 90;
  }

  // ---- LCD & Serial ----
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(material + " Det");
  lcd.setCursor(0, 1);
  lcd.print("Total:");
  lcd.print(totalWeight / 1000, 1);
  lcd.print(" kg");

  Serial.printf("Moist:%d%% | Gas:%d | ΔW:%.1f g | Total:%.1f g | %s\n",
                moisturePercent, gasValue, weightDiff, totalWeight, material.c_str());

  // ---- Servo sorting ----
  sorterServo.write(servoAngle);
  delay(1000);
  sorterServo.write(90);

  delay(300);
}