#define BLYNK_TEMPLATE_ID           "TMPL2OeXhA_I2"
#define BLYNK_TEMPLATE_NAME         "Smart Waste Management System"
#define BLYNK_AUTH_TOKEN            "JXuTLg6wGCIFoQpEoYzRzgWtFwD1LD9s"
#define BLYNK_PRINT Serial
#include <BlynkSimpleEsp32.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <ESP32Servo.h>

#define Second 1000
#define Dry_Echo 18
#define Dry_Trig 19
#define Wet_Echo 22
#define Wet_Trig 23
#define SoilMoisture 33
#define ServoMotor 21

// functions
void send_blynk();
float calculate_distance(int Trig, int Echo, char can);
bool is_full(int Trig, int Echo, char can);
float calibrate(int moisture);

// global variables
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
bool dry_full = 0;
bool wet_full = 0;
int servo_pos = 90;
int max_moisture = 4095;
int min_moisture = 1095;
float threshold = calibrate(4000);
BlynkTimer timer;
Servo servo;

void setup() {
  Serial.begin(115200);
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
  pinMode(Dry_Trig, OUTPUT);
  pinMode(Dry_Echo, INPUT);
  pinMode(Wet_Trig, OUTPUT);
  pinMode(Wet_Echo, INPUT);
  pinMode(SoilMoisture, INPUT);
  servo.attach(ServoMotor, 500, 2400);
  timer.setInterval(1000, send_blynk);
}

void loop() {
  Serial.println("______________________");

  // manage trash
  int moisture_value = analogRead(SoilMoisture);
  float moisture = calibrate(moisture_value);
  Serial.print("Moisture : ");
  Serial.print(moisture_value);
  Serial.print(" ----> calibrated : ");
  Serial.print(moisture);
  Serial.println("%");
  bool wet_trash = moisture > threshold;
  if(wet_trash){
    Serial.print("The trash is wet! (threshold = ");
    Serial.print(threshold);
    Serial.println("%)");
    // open gate
    for (servo_pos = 90; servo_pos >= 0; servo_pos -= 1) {
      servo.write(servo_pos);
      delay(15);
    }
    delay(5 * Second);
    // close gate
    for (servo_pos = 0; servo_pos <= 90; servo_pos += 1) {
      servo.write(servo_pos);
      delay(15);
    }
  }

  // manage can
  dry_full = is_full(Dry_Trig, Dry_Echo, 'D');
  wet_full = is_full(Wet_Trig, Wet_Echo, 'W');
  if (dry_full){
    Serial.println("The dry can is full.");
  }
  if (wet_full){
    Serial.println("The wet can is full.");
  }

  Blynk.run();
  timer.run();
  delay(10 * Second);
}

void send_blynk(){
  if (wet_full){
    Blynk.logEvent("wet_can_is_full") ;
    Blynk.virtualWrite(V1, 1);
  }else{
    Blynk.virtualWrite(V1, 0);
  }
  if (dry_full){
    Blynk.logEvent("dry_can_is_full") ;
    Blynk.virtualWrite(V0, 1);
  }else{
    Blynk.virtualWrite(V0, 0);
  }
}

float calculate_distance(int Trig, int Echo, char can){
  digitalWrite(Trig, LOW);
  delay(2);
  digitalWrite(Trig, HIGH);
  delay(10);
  digitalWrite(Trig, LOW);

  int duration = pulseIn(Echo, HIGH);
  float distance = duration * 0.034 /2;

  Serial.print(can);
  Serial.print(" free space : ");
  Serial.print(distance);
  Serial.println(" CM");
  return distance;
}

bool is_full(int Trig, int Echo, char can){
  float distance = calculate_distance(Trig, Echo, can);
  return distance < 4;
}

float calibrate(int moisture){
  int x = (max_moisture - min_moisture)/100;
  return (max_moisture - moisture)/x;
}