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

#define PHOTO_PIN A0
#define SWITCH_PIN 2
#define SERVO_PIN 9
#define LED_LOCAL 7
#define LED_REMOTE 8

// Initialize the LCD
LiquidCrystal_I2C lcd(0x27, 16, 2);

Servo servo;

enum Mode {
  AUTO,
  MANUAL
};

Mode currentMode = AUTO;
int angle = 90; // Initial angle
int previousAngle = 90; // Previous angle for comparison

void setup() {
  // Initialize Serial communication
  Serial.begin(9600);

  // Initialize LCD
  lcd.init();
  lcd.backlight();

  // Attach servo to pin
  servo.attach(SERVO_PIN);

  // Set switch pin as input
  pinMode(SWITCH_PIN, INPUT_PULLUP);

  // Set LED pins as output
  pinMode(LED_LOCAL, OUTPUT);
  pinMode(LED_REMOTE, OUTPUT);
}

void loop() {
  // Read the switch state to determine the mode
  if (digitalRead(SWITCH_PIN) == LOW) {
    currentMode = AUTO;
  } else {
    currentMode = MANUAL;
  }

  // Control servo based on the current mode
  if (currentMode == AUTO) {
    // Auto mode: Control servo with photoresistor
    int lightLevel = analogRead(PHOTO_PIN);
    angle = map(lightLevel, 0, 1023, 0, 180); // Map light level to servo angle
  } else {
    // Manual mode: Control servo with serial input
    if (Serial.available() > 0) {
      angle = Serial.parseInt(); // Read angle from serial input
      angle = constrain(angle, 0, 180); // Limit angle within valid range
      Serial.read(); // Clear newline character
    }
  }

  // If the angle has changed, update the servo angle
  if (angle != previousAngle) {
    servo.write(angle); // Set servo angle
    previousAngle = angle; // Update previous angle
  }

  // Display mode and angle on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  if (currentMode == AUTO) {
    lcd.print("Auto Mode    ");
    digitalWrite(LED_LOCAL, LOW);  // Turn off local mode LED
    digitalWrite(LED_REMOTE, HIGH); // Turn on remote mode LED
  } else {
    lcd.print("Manual Mode  ");
    digitalWrite(LED_LOCAL, HIGH);  // Turn on local mode LED
    digitalWrite(LED_REMOTE, LOW);  // Turn off remote mode LED
  }
  lcd.setCursor(0, 1);
  lcd.print("Angle: ");
  lcd.print(angle);

  // Print current status to Serial Monitor
  if (currentMode == MANUAL) {
    Serial.print("Manual Mode: ");
  } else {
    Serial.print("Auto Mode: ");
  }
  Serial.println(angle);

  delay(100); // Small delay for stability
}