#define DARK HIGH
#define LIGHT LOW

const int LDR_PIN = 4; // Pin for LDR Sensor
const int RELAY_PIN = 2; // Pin for Relay
const int BUTTON_MODE_PIN = 17; // Pin for Button Switch 1 (Mode Switch)
const int BUTTON_MANUAL_PIN = 18; // Pin for Button Switch 2 (Manual On/Off)
const int LED_RED_PIN = 22; // Pin for Red LED (Auto Mode Indicator)
const int LED_WHITE_PIN = 21; // Pin for White LED (Light Indicator)

bool isAutoMode = false; // Mode state (false = Manual, true = Auto)
bool manualLightState = false; // Manual light state

void setup() {
  Serial.begin(115200);

  // Set pin modes
  pinMode(LDR_PIN, INPUT);
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(BUTTON_MODE_PIN, INPUT_PULLUP);
  pinMode(BUTTON_MANUAL_PIN, INPUT_PULLUP);
  pinMode(LED_RED_PIN, OUTPUT);
  pinMode(LED_WHITE_PIN, OUTPUT);

  // Initialize outputs
  digitalWrite(RELAY_PIN, LOW);
  digitalWrite(LED_RED_PIN, LOW);
  digitalWrite(LED_WHITE_PIN, LOW);
}

void loop() {
  static bool lastModeButtonState = HIGH;
  static bool lastManualButtonState = HIGH;

  // Read button states
  bool modeButtonState = digitalRead(BUTTON_MODE_PIN);
  bool manualButtonState = digitalRead(BUTTON_MANUAL_PIN);

  // Handle mode switch (toggle mode)
  if (modeButtonState == LOW && lastModeButtonState == HIGH) {
    isAutoMode = !isAutoMode; // Toggle mode
    Serial.println(isAutoMode ? "Switched to Auto Mode" : "Switched to Manual Mode");
  }
  lastModeButtonState = modeButtonState;

  // Auto Mode
  if (isAutoMode) {
    digitalWrite(LED_RED_PIN, HIGH); // Turn on Red LED for Auto Mode
    int lightState = digitalRead(LDR_PIN);

    if (lightState == DARK) {
      digitalWrite(RELAY_PIN, HIGH); // Turn on light
      digitalWrite(LED_WHITE_PIN, HIGH);
      Serial.println("Auto Mode: Dark! Light Open.");
    } else {
      digitalWrite(RELAY_PIN, LOW); // Turn off light
      digitalWrite(LED_WHITE_PIN, LOW);
      Serial.println("Auto Mode: Light! Light Closed.");
    }
  } 
  // Manual Mode
  else {
    digitalWrite(LED_RED_PIN, LOW); // Turn off Red LED for Manual Mode

    // Handle manual light control
    if (manualButtonState == LOW && lastManualButtonState == HIGH) {
      manualLightState = !manualLightState; // Toggle light state
      Serial.println(manualLightState ? "Manual Mode: Light Open" : "Manual Mode: Light Closed");
    }
    lastManualButtonState = manualButtonState;

    // Set light based on manual state
    digitalWrite(RELAY_PIN, manualLightState ? HIGH : LOW);
    digitalWrite(LED_WHITE_PIN, manualLightState ? HIGH : LOW);
  }

  delay(100); // Debounce delay
}