/***************************************************************
*ESP 32 IR RELAY CHALLENGE: USING THE POWER OF REMOTE CONTROL*
*SUBMITTED BY: CO, MA.DIANNA R.*
*SUBMITTED TO: PROF.MICHAEL T. SAMONTE*
***************************************************************/


#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <IRremoteESP8266.h>
#include <IRrecv.h>
#include <IRutils.h>

#define RELAY1_PIN 23  // pin for Relay 1
#define RELAY2_PIN 19  // pin for Relay 2
#define RELAY3_PIN 18  // pin for Relay 3
#define RELAY4_PIN 5 // pin for Relay 4

#define IR_PIN 26 // pin for IR receiver

#define BUTTON1_PIN 13 // pin for Button 1
#define BUTTON2_PIN 12 // pin for Button 2
#define BUTTON3_PIN 14 // pin for Button 3
#define BUTTON4_PIN 27 // pin for Button 4

LiquidCrystal_I2C lcd(0x27, 16, 4);
IRrecv irReceiver(IR_PIN);

void setup() {
  pinMode(RELAY1_PIN, OUTPUT);
  pinMode(RELAY2_PIN, OUTPUT);
  pinMode(RELAY3_PIN, OUTPUT);
  pinMode(RELAY4_PIN, OUTPUT);

  pinMode(BUTTON1_PIN, INPUT_PULLUP);
  pinMode(BUTTON2_PIN, INPUT_PULLUP);
  pinMode(BUTTON3_PIN, INPUT_PULLUP);
  pinMode(BUTTON4_PIN, INPUT_PULLUP);

  lcd.init();       //initialize the LCD
  lcd.backlight(); // turn on backlight
  irReceiver.enableIRIn(); // Start the IR receiver
}

void loop() {
  static unsigned long lastRefreshTime = 0;
  static boolean ledStates[] = {false, false, false, false};

  // Check for IR remote input
  decode_results results;
  if (irReceiver.decode(&results)) {
    handleIRRemote(results.value, ledStates);
    irReceiver.resume();
  }

  // Check button states
  updateButtonState(BUTTON1_PIN, ledStates[0], RELAY1_PIN);
  updateButtonState(BUTTON2_PIN, ledStates[1], RELAY2_PIN);
  updateButtonState(BUTTON3_PIN, ledStates[2], RELAY3_PIN);
  updateButtonState(BUTTON4_PIN, ledStates[3], RELAY4_PIN);

  // Refresh LCD every 500 milliseconds
  if (millis() - lastRefreshTime >= 500) {
    updateLCD(ledStates);
    lastRefreshTime = millis();
  }
}

void handleIRRemote(uint64_t code, boolean ledStates[]) {
  switch (code) {
    case 0XFF0CF3: // Example IR remote code for LED 1
      ledStates[0] = !ledStates[0];
      digitalWrite(RELAY1_PIN, ledStates[0] ? HIGH : LOW);
      break;
    case 0XFF18E7: // Example IR remote code for LED 2
      ledStates[1] = !ledStates[1];
      digitalWrite(RELAY2_PIN, ledStates[1] ? HIGH : LOW);
      break;
    case 0XFF5EA1: // Example IR remote code for LED 3
      ledStates[2] = !ledStates[2];
      digitalWrite(RELAY3_PIN, ledStates[2] ? HIGH : LOW);
      break;
    case 0XFF08F7: // Example IR remote code for LED 4
      ledStates[3] = !ledStates[3];
      digitalWrite(RELAY4_PIN, ledStates[3] ? HIGH : LOW);
      break;
    // Add cases for other remote codes as needed
  }
}

void updateButtonState(int buttonPin, boolean &ledState, int relayPin) {
  if (digitalRead(buttonPin) == LOW) {
    ledState = !ledState;
    digitalWrite(relayPin, ledState ? HIGH : LOW);
    delay(250); // Button debounce delay
  }
}

void updateLCD(boolean ledStates[]) {
  
  for (int i = 0; i < 4; i++) {
    lcd.setCursor(0, i);
    lcd.print("LED");
    lcd.print(i + 1);
    lcd.print(": ");
    lcd.print(ledStates[i] ? "ON " : "OFF");
  }
}