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

// ตั้งรีเลย์ 16 ตัว
const int relayPins[16] = {
  30, 31, 32, 33, 34, 35, 36, 37,   // Zone 1: Relay 1–8
  38, 39, 40, 41, 42, 43, 44, 45    // Zone 2: Relay 9–16
};

// ปุ่ม Zone 1
#define BUTTON_ON_1  22
#define BUTTON_OFF_1 23  // ใช้ NC

// ปุ่ม Zone 2
#define BUTTON_ON_2  24
#define BUTTON_OFF_2 25  // ใช้ NC

LiquidCrystal_I2C lcd(0x27, 16, 2);

bool relayOnZone1 = false;
bool relayOnZone2 = false;

bool lastBtnOn1 = HIGH;
bool lastBtnOff1 = LOW;  // สำหรับปุ่ม NC
bool lastBtnOn2 = HIGH;
bool lastBtnOff2 = LOW;  // สำหรับปุ่ม NC

unsigned long startTime1 = 0;
unsigned long startTime2 = 0;

const unsigned long duration = 3600000; // 60 นาที
unsigned long lastDisplayTime = 0;

void setup() {
for (int i = 0; i < 16; i++) {
    pinMode(relayPins[i], OUTPUT);
    digitalWrite(relayPins[i], HIGH); // ปิดทั้งหมด
  }
  pinMode(BUTTON_ON_1, INPUT_PULLUP);
  pinMode(BUTTON_OFF_1, INPUT_PULLUP);
  pinMode(BUTTON_ON_2, INPUT_PULLUP);
  pinMode(BUTTON_OFF_2, INPUT_PULLUP);

  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Zone 1: OFF     ");
  lcd.setCursor(0, 1);
  lcd.print("Zone 2: OFF     ");

  Serial.begin(9600);
}

void loop() {
  bool btnOn1  = digitalRead(BUTTON_ON_1);
  bool btnOff1 = digitalRead(BUTTON_OFF_1);
  bool btnOn2  = digitalRead(BUTTON_ON_2);
  bool btnOff2 = digitalRead(BUTTON_OFF_2);

  // Zone 1 ON (NO)
  if (lastBtnOn1 == HIGH && btnOn1 == LOW) {
    startTime1 = millis();
    for (int i = 0; i < 8; i++) {
      digitalWrite(relayPins[i], HIGH);
    }
    relayOnZone1 = true;
    Serial.println("✅ Zone 1 ON");
    lcd.setCursor(0, 0);
    lcd.print("Zone 1: ON      ");
    delay(200);
  }

  // Zone 1 OFF (NC)
  if (lastBtnOff1 == LOW && btnOff1 == HIGH) {
    for (int i = 0; i < 8; i++) {
      digitalWrite(relayPins[i], LOW);
    }
    relayOnZone1 = false;
    Serial.println("🛑 Zone 1 OFF");
    lcd.setCursor(0, 0);
    lcd.print("Zone 1: OFF     ");
    delay(200);
  }

  // Zone 2 ON (NO)
  if (lastBtnOn2 == HIGH && btnOn2 == LOW) {
    startTime2 = millis();
    for (int i = 8; i < 16; i++) {
      digitalWrite(relayPins[i], HIGH);
    }
    relayOnZone2 = true;
    Serial.println("✅ Zone 2 ON");
    lcd.setCursor(0, 1);
    lcd.print("Zone 2: ON      ");
    delay(200);
  }

  // Zone 2 OFF (NC)
  if (lastBtnOff2 == LOW && btnOff2 == HIGH) {
    for (int i = 8; i < 16; i++) {
      digitalWrite(relayPins[i], LOW);
    }
    relayOnZone2 = false;
    Serial.println("🛑 Zone 2 OFF");
    lcd.setCursor(0, 1);
    lcd.print("Zone 2: OFF     ");
    delay(200);
  }

  lastBtnOn1 = btnOn1;
  lastBtnOff1 = btnOff1;
  lastBtnOn2 = btnOn2;
  lastBtnOff2 = btnOff2;

  // แสดงเวลาคงเหลือ
  if (millis() - lastDisplayTime >= 1000) {
    lastDisplayTime = millis();

    if (relayOnZone1) {
      unsigned long rem = duration - (millis() - startTime1);
      unsigned int m = rem / 60000;
      unsigned int s = (rem % 60000) / 1000;
      lcd.setCursor(11, 0);
      if (m < 10) lcd.print("0"); lcd.print(m); lcd.print(":");
      if (s < 10) lcd.print("0"); lcd.print(s);
    }

    if (relayOnZone2) {
      unsigned long rem = duration - (millis() - startTime2);
      unsigned int m = rem / 60000;
      unsigned int s = (rem % 60000) / 1000;
      lcd.setCursor(11, 1);
      if (m < 10) lcd.print("0"); lcd.print(m); lcd.print(":");
      if (s < 10) lcd.print("0"); lcd.print(s);
    }
  }

  // Timeout Zone 1
  if (relayOnZone1 && millis() - startTime1 >= duration) {
    for (int i = 0; i < 8; i++) {
      digitalWrite(relayPins[i], LOW);
    }
    relayOnZone1 = false;
    lcd.setCursor(0, 0);
    lcd.print("Zone 1: OFF     ");
    Serial.println("⏱️ Zone 1 OFF (Timeout)");
  }

  // Timeout Zone 2
  if (relayOnZone2 && millis() - startTime2 >= duration) {
    for (int i = 8; i < 16; i++) {
      digitalWrite(relayPins[i], LOW);
    }
    relayOnZone2 = false;
    lcd.setCursor(0, 1);
    lcd.print("Zone 2: OFF     ");
    Serial.println("⏱️ Zone 2 OFF (Timeout)");
  }
}