#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Encoder.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_ADDR 0x3C

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// Piny
const int pressurePin = A0;
const int compressorPin = 2;
const int releaseValvePin = 4;
const int buttonPin = 3;
const int encoderCLK = 6;
const int encoderDT = 7;
const int encoderSW = 8;

Encoder encoder(encoderCLK, encoderDT);

bool isRunning = false;
bool isVacuumHold = false;
float pressure = 0.0;
int vacuumThreshold = 30;  // kPa
int encoderPrev = 0;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 200;
bool lastButtonState = HIGH;

unsigned long startVacuumTime = 0;
unsigned long vacuumHoldDuration = 30000; // ms = 30 sek

void setup() {
  pinMode(compressorPin, OUTPUT);
  pinMode(releaseValvePin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(encoderSW, INPUT_PULLUP);

  digitalWrite(compressorPin, LOW);
  digitalWrite(releaseValvePin, LOW);

  encoder.write(vacuumThreshold * 4);  // każdy krok = 0.25

  display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println("System gotowy");
  display.display();
}

void loop() {
  // Odczyt czujnika ciśnienia
  int raw = analogRead(pressurePin);
  pressure = map(raw, 102, 922, 0, 100); // MPX5100: 0.5–4.5V → 0–100 kPa

  // Obsługa enkodera
  int newEnc = encoder.read() / 4;
  if (newEnc != encoderPrev) {
    encoderPrev = newEnc;
    vacuumThreshold = constrain(newEnc, 10, 90);  // zakres 10–90 kPa
  }

  // Obsługa przycisku START
  bool currentButtonState = digitalRead(buttonPin);
  if (currentButtonState == LOW && lastButtonState == HIGH && millis() - lastDebounceTime > debounceDelay) {
    lastDebounceTime = millis();
    if (!isRunning && !isVacuumHold) {
      isRunning = true;
      digitalWrite(compressorPin, HIGH);
      digitalWrite(releaseValvePin, LOW);
    } else if (isVacuumHold) {
      isRunning = false;
      isVacuumHold = false;
      digitalWrite(compressorPin, LOW);
      digitalWrite(releaseValvePin, LOW);
    }
  }
  lastButtonState = currentButtonState;

  // Zatrzymanie kompresora po osiągnięciu progu
  if (isRunning && pressure <= vacuumThreshold) {
    digitalWrite(compressorPin, LOW);
    isRunning = false;
    isVacuumHold = true;
    startVacuumTime = millis();
  }

  // Auto-opróżnianie po czasie
  if (isVacuumHold && millis() - startVacuumTime >= vacuumHoldDuration) {
    digitalWrite(releaseValvePin, HIGH);
    isVacuumHold = false;
  }

  // OLED wyświetlanie
  display.clearDisplay();
  display.setCursor(0, 0);
  display.print("Cisnienie: ");
  display.print(pressure, 1);
  display.println(" kPa");

  display.setCursor(0, 15);
  display.print("Prog: ");
  display.print(vacuumThreshold);
  display.println(" kPa");

  display.setCursor(0, 30);
  display.print("Kompresor: ");
  display.println(digitalRead(compressorPin) ? "ON" : "OFF");

  display.setCursor(0, 45);
  display.print("Zawor: ");
  display.println(digitalRead(releaseValvePin) ? "OPEN" : "CLOSED");

  display.display();
  delay(150);
}