// Pin definitions
const int buttonPin = 5;
const int ledPin = 6;
const int ldrPin = A3;

// Variables for button state and LED toggle
int buttonState = 0;
int lastButtonState = 0;
int ledState = LOW;  // Start with LED off

void setup() {
  pinMode(buttonPin, INPUT);
  pinMode(ledPin, OUTPUT);

  Serial.begin(9600); 
}

void loop() {
  checkButton();       // Check if the button is pressed and toggle the state
  updateLED();         // Update LED state based on button and LDR when LED is ON
  delay(100);          // Short delay for stability
}

// Function to check the button press and toggle LED state
void checkButton() {
  buttonState = digitalRead(buttonPin);

  // Toggle LED state on button press
  if (buttonState == HIGH && lastButtonState == LOW) {
    ledState = !ledState;  // Toggle the LED state
  }
  lastButtonState = buttonState;
}

// Function to update LED brightness based on the LDR when LED is ON
void updateLED() {
  // If the LED is turned ON by the button
  if (ledState == HIGH) {
    int ldrValue = analogRead(ldrPin);   // Read the LDR value (0-1023)
    
    // Map the LDR value to PWM range (0-255) for brightness control
    int brightness = map(ldrValue, 0, 1023, 0, 255);  // Darker = brighter
    
    // Apply the brightness to the LED using PWM
    analogWrite(ledPin, brightness);
    
    // Debugging output
    Serial.print("LDR Value: ");
    Serial.print(ldrValue);
    Serial.print(" | LED Brightness: ");
    Serial.println(brightness);
  } else {
    // If the LED is OFF, ensure it's completely off
    analogWrite(ledPin, 0);
    Serial.println("LED OFF.");
  }
}