#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include "DHT.h"

// --- CONFIGURARE PINI ---

// NOD 1: HOL & SECURITATE
#define HOL_DOOR 5
#define HOL_LOCK 17
#define ARM_BTN 4
#define ALARM_LED 16
#define BUZZER 13

// LIVING (Lumini 3 trepte + HVAC)
#define LIV_L1 18
#define LIV_L2 19
#define LIV_L3 23
#define LIV_COOL 15    // LED Albastru
#define LIV_HEAT 2     // LED Portocaliu
#define LIV_HUM 0      // LED Alb
#define LIV_DOOR 25

// DORMITOR (Lumini 3 trepte + HVAC)
#define DOR_L1 26
#define DOR_L2 27
#define DOR_L3 14
#define DOR_COOL 12    // LED Albastru
#define DOR_DOOR 21

// NOD 2: UTILITARE (Baie & Bucatarie)
#define BUC_L 32
#define BUC_HOTA 33
#define BUC_GAS 34     // Analog
#define BAI_L 22
#define BAI_WATER 35   // Analog/Digital

// SENZORI GENERALI
#define DHTPIN 14
#define LDR_PIN 39     // Analog

DHT dht(DHTPIN, DHT22);
LiquidCrystal_I2C lcd(0x27, 16, 2);

// VARIABILE DE STARE
enum State { DISARMED, ARMED, TRIGGERED };
State systemState = DISARMED;

unsigned long prevSensors = 0;
unsigned long prevDisplay = 0;
int displayPage = 0;
float temp, hum;
int lightLevel;

void setup() {
  Serial.begin(115200);
  dht.begin();
  lcd.init();
  lcd.backlight();

  // Configurare Iesiri
  int outputs[] = {HOL_L1, LIV_L1, LIV_L2, LIV_L3, LIV_COOL, LIV_HEAT, LIV_HUM, 
                   DOR_L1, DOR_L2, DOR_L3, DOR_COOL, BUC_L, BUC_HOTA, BAI_L, 
                   ALARM_LED, BUZZER};
  for(int p : outputs) pinMode(p, OUTPUT);

  // Configurare Intrari
  pinMode(HOL_DOOR, INPUT_PULLUP);
  pinMode(HOL_LOCK, INPUT_PULLUP);
  pinMode(LIV_DOOR, INPUT_PULLUP);
  pinMode(DOR_DOOR, INPUT_PULLUP);
  pinMode(ARM_BTN, INPUT_PULLUP);

  lcd.print("Smart Home Hub");
  delay(2000);
}

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

  // 1. ACHIZITIE DATE SENZORI (La 1 secunda)
  if (now - prevSensors > 1000) {
    prevSensors = now;
    temp = dht.readTemperature();
    hum = dht.readHumidity();
    lightLevel = analogRead(LDR_PIN);
    int gas = analogRead(BUC_GAS);
    bool water = (analogRead(BAI_WATER) > 500);

    // --- LOGICA HVAC (Conform limitelor impuse) ---
    // Living & Dormitor
    bool coolReq = (temp > 28.0);
    bool heatReq = (temp < 24.0);
    bool humReq = (hum < 40.0 || hum > 60.0);

    digitalWrite(LIV_COOL, coolReq);
    digitalWrite(LIV_HEAT, heatReq);
    digitalWrite(LIV_HUM, humReq);
    digitalWrite(DOR_COOL, coolReq);

    // --- LOGICA BUCATARIE (Gaz) ---
    if (gas > 2000) digitalWrite(BUC_HOTA, HIGH);
    else digitalWrite(BUC_HOTA, LOW);
    
    // --- LOGICA BAIE (Apa) ---
    if (water) {
       // Alerta inundatie imediata
       lcd.setCursor(0,1); lcd.print("ALERTA INUNDATIE");
    }
  }

  // 2. ILUMINAT ADAPTIV (3 Trepte - Exemplu Living)
  int steps = map(lightLevel, 0, 4095, 3, 0); // 4095 e intuneric in Wokwi LDR
  digitalWrite(LIV_L1, steps >= 1 || digitalRead(LIV_DOOR) == HIGH);
  digitalWrite(LIV_L2, steps >= 2);
  digitalWrite(LIV_L3, steps >= 3);

  // 3. SECURITATE & INTERBLOCARE
  static int lastBtn = HIGH;
  int btn = digitalRead(ARM_BTN);
  
  bool holClosed = (digitalRead(HOL_DOOR) == LOW);
  bool holLocked = (digitalRead(HOL_LOCK) == LOW);

  if (btn == LOW && lastBtn == HIGH) {
    if (systemState == DISARMED) {
      if (holClosed && holLocked) {
        systemState = ARMED;
        digitalWrite(ALARM_LED, HIGH);
      } else {
        lcd.clear(); lcd.print("Inchide usa/bloc");
        delay(1500);
      }
    } else {
      systemState = DISARMED;
      digitalWrite(ALARM_LED, LOW);
      digitalWrite(BUZZER, LOW);
    }
    delay(50);
  }
  lastBtn = btn;

  // Detectie efractie
  if (systemState == ARMED) {
    if (!holClosed || !holLocked || digitalRead(LIV_DOOR) == HIGH) {
      systemState = TRIGGERED;
    }
  }

  // 4. AFISARE LCD ROTATIVA
  if (now - prevDisplay > 2500) {
    prevDisplay = now;
    lcd.clear();
    switch(displayPage) {
      case 0:
        lcd.print(systemState == ARMED ? "SISTEM: ARMAT" : "SISTEM: DEZARMAT");
        lcd.setCursor(0,1); lcd.print(holClosed ? "Usa: Inchisa" : "Usa: DESCHISA!");
        break;
      case 1:
        lcd.print("T:"); lcd.print(temp,1); lcd.print("C H:"); lcd.print(hum,0); lcd.print("%");
        lcd.setCursor(0,1); 
        if(temp > 28) lcd.print("AC: RACIRE ON");
        else if(temp < 24) lcd.print("AC: INCALZIRE ON");
        else lcd.print("AC: STANDBY");
        break;
      case 2:
        lcd.print("LUMINA LIVING");
        lcd.setCursor(0,1); lcd.print("Nivel: "); lcd.print(steps); lcd.print("/3");
        break;
    }
    displayPage = (displayPage + 1) % 3;
  }

  if (systemState == TRIGGERED) {
    digitalWrite(BUZZER, (millis() % 400 < 200));
    digitalWrite(ALARM_LED, (millis() % 400 < 200));
    lcd.setCursor(0,0); lcd.print("!!! ALARMA !!!");
  }
}