/* * Craig's Smart Dog Bowl Monitor v3.0 - Professional Logic
 * Pins: GPIO 0 (Sensor), 2 (Blue), 3 (Red), 4 (Green), 5 (Yellow)
 */

const int sensorPin = 0; 
const int blueLED   = 2; 
const int redLED    = 3; 
const int greenLED  = 4; 
const int yellowLED = 5; 

String currentStatus = "INIT";

void setup() {
  Serial.begin(115200);
  pinMode(blueLED, OUTPUT);
  pinMode(redLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);

  // --- STARTUP SELF-CHECK ---
  Serial.println(">>> Initializing Hardware...");
  int sequence[] = {redLED, yellowLED, blueLED, greenLED};
  for (int pin : sequence) {
    digitalWrite(pin, HIGH);
    delay(250);
    digitalWrite(pin, LOW);
  }
  Serial.println("--- System Online: Dog Bowl Monitor v3.0 ---");
}

void loop() {
  // 1. SMOOTHING (Average 20 samples)
  long total = 0;
  for (int i = 0; i < 20; i++) {
    total += analogRead(sensorPin);
    delay(5);
  }
  int weight = total / 20;
  
  // Calculate approximate percentage for the simulation
  // ESP32 ADC is 12-bit (0-4095)
  float percent = (weight / 4095.0) * 100.0;

  // 2. DIFFERENTIAL ERROR DETECTION
  // LOW ERROR (Broken Wire/Unplugged)
  if (weight < 10) {
    handleError("LOW", redLED, yellowLED, blueLED);
    return;
  } 
  // HIGH ERROR (Crushed/Short Circuit)
  else if (weight > 4080) {
    handleError("HIGH", blueLED, redLED, yellowLED);
    return;
  }

  // 3. WATER LEVEL LOGIC
  if (weight > 2500) {
    setLights(LOW, LOW, HIGH); // Blue
    updateLog("FULL", weight, percent);
  } 
  else if (weight < 2300 && weight > 1000) {
    setLights(LOW, HIGH, LOW); // Yellow
    updateLog("WARNING", weight, percent);
  } 
  else if (weight < 800) {
    setLights(HIGH, LOW, LOW); // Red
    updateLog("CRITICAL", weight, percent);
  }

  // 4. SYNC BLINK (Green)
  if (millis() % 10000 < 300) {
    digitalWrite(greenLED, HIGH);
  } else {
    digitalWrite(greenLED, LOW);
  }

  delay(200);
}

// ERROR HANDLING: One LED stays solid, others blink
void handleError(String type, int solidPin, int blink1, int blink2) {
  digitalWrite(solidPin, HIGH);
  digitalWrite(blink1, HIGH);
  digitalWrite(blink2, HIGH);
  Serial.print("!! SENSOR ERROR ["); Serial.print(type); Serial.println("] !!");
  delay(300);
  digitalWrite(blink1, LOW);
  digitalWrite(blink2, LOW);
  delay(300);
}

void setLights(int r, int y, int b) {
  digitalWrite(redLED, r);
  digitalWrite(yellowLED, y);
  digitalWrite(blueLED, b);
}

void updateLog(String status, int weight, float percent) {
  if (currentStatus != status) {
    Serial.print("STATUS: "); Serial.print(status);
    Serial.print(" | Weight: "); Serial.print(weight);
    Serial.print(" | Approx: "); Serial.print(percent, 1); Serial.println("%");
    currentStatus = status;
  }
}