// ==================================================
// Tank + Pump Simulator (Single Arduino - Wokwi)
//
// Concept/Idea: N. M. D. Weerasinghe @ COTM
// Sketch Created with assistance from ChatGPT (GPT-5)
// Date: 2025-08-24
//
// ==================================================
// Tank simulator runs internally, students edit ONLY
// the "STUDENT PUMP CONTROLLER LOGIC" section below.
//
// Tank Level: 0-100
// Pin Mappings (virtual sensors):
//   Pin 8  = HL  (>75)
//   Pin 9  = HHL (>90)
//   Pin 10 = OF  (>=98)
//   Pin 11 = LL  (<25)
//   Pin 12 = LLL (<10)
//   Pin 13 = CL  (<3)
// Pump command = pin 7 (student output)
//
// ==================================================

int pumpCommand = 7;   // Student controls pump here

// Internal tank simulator variables
int tank_level = 0;
unsigned long lastPumpMillis = 0;
unsigned long lastUseMillis  = 0;

// Sensor pins (output to "virtual environment")
int HL  = 8;
int HHL = 9;
int OF  = 10;
int LL  = 11;
int LLL = 12;
int CL  = 13;

// Consumption toggle (simulate water usage)
bool consumptionEnabled = true;

void setup() {
  // Pump output (student control)
  pinMode(pumpCommand, OUTPUT);
  digitalWrite(pumpCommand, LOW);

  // Sensor outputs (driven by simulator)
  pinMode(HL, OUTPUT);
  pinMode(HHL, OUTPUT);
  pinMode(OF, OUTPUT);
  pinMode(LL, OUTPUT);
  pinMode(LLL, OUTPUT);
  pinMode(CL, OUTPUT);

  Serial.begin(9600);
  Serial.println("Tank + Pump Simulator Ready");
}

void loop() {
  unsigned long now = millis();

  // === Tank filling (depends on pump command) ===
  if (digitalRead(pumpCommand) == HIGH) {
    if (now - lastPumpMillis >= 500) {   // every 0.5s
      lastPumpMillis = now;
      if (tank_level < 100) tank_level++;
    }
  }

  // === Tank consumption (independent) ===
  if (consumptionEnabled) {
    if (now - lastUseMillis >= 1000) {   // every 1s
      lastUseMillis = now;
      if (tank_level > 0) tank_level--;
    }
  }

  // === Update sensor outputs ===
  digitalWrite(HL,  (tank_level > 75));
  digitalWrite(HHL, (tank_level > 90));
  digitalWrite(OF,  (tank_level >= 98));
  digitalWrite(LL,  (tank_level < 25));
  digitalWrite(LLL, (tank_level < 10));
  digitalWrite(CL,  (tank_level < 3));

  // ==================================================
  // 🚧 STUDENT PUMP CONTROLLER LOGIC STARTS HERE 🚧
  // Example: Simple rule-based pump control
  // Replace with your own logic!
  if (digitalRead(LL) == HIGH) {
    digitalWrite(pumpCommand, HIGH); // turn ON pump
  }
  if (digitalRead(HL) == HIGH) {
    digitalWrite(pumpCommand, LOW);  // turn OFF pump
  }
  // 🚧 STUDENT SECTION ENDS 🚧
  // ==================================================

  // === Debug Print ===
  Serial.print("Tank=");
  Serial.print(tank_level);

  Serial.print(" | HL=");  Serial.print(digitalRead(HL));
  Serial.print(" HHL=");  Serial.print(digitalRead(HHL));
  Serial.print(" OF=");   Serial.print(digitalRead(OF));
  Serial.print(" LL=");   Serial.print(digitalRead(LL));
  Serial.print(" LLL=");  Serial.print(digitalRead(LLL));
  Serial.print(" CL=");   Serial.print(digitalRead(CL));

  Serial.print(" | Pump=");
  Serial.println(digitalRead(pumpCommand));

  delay(100);
}