#include <Servo.h>

// Pin configuration
int servoPin = 9;
const int button1_pin = 4;
const int button2_pin = 3;

// Constants for the photoresistor
const float GAMMA = 0.7;
const float RL10 = 50;

// Servo and state variables
Servo myservo;
int button1_value;  //0 for low value, 1 for high value
int button2_value;  //0 for low value, 1 for high value
int state = 0;
int prevstate = 0;
int newState;
int dirc = 0;   //continuous servo direction 
int time = 0;  //time to spin that direction

void setup() {
  Serial.begin(9600);
  Serial.println("Start Up");
  myservo.attach(servoPin);
  pinMode(button1_pin, INPUT);
  pinMode(button2_pin, INPUT);
}

void loop() {
  button1_value = digitalRead(button1_pin);
  button2_value = digitalRead(button2_pin);

  // Convert analog value to lux
  int analogValue = analogRead(A0);
  float voltage = analogValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));

  // Define modes based on brightness and button presses
  if (button1_value == HIGH) {
    dirc = 180; // direction for servo to run
    time = 3600; //time for servo to run in, change this variable if you need your servo to rotate longer or shorter
    newState = 1;
    Serial.println("Button 1 was pushed. Blind up.");
  } else if (button2_value == HIGH) {
    dirc = 0; // direction for servo to run
    time = 3000; //time for servo to run in, change this variable if you need your servo to rotate longer or shorter 
    Serial.println("Button 2 was pushed. Blind down.");
    newState = 2;
  } else if (lux > 500 && state != 2) {
    dirc = 180; // direction for servo to run
    time = 3600; //time for servo to run in, , change this variable if you need your servo to rotate longer or shorter 
    Serial.println("Auto DAY routine. Blind up.");
    newState = 3;
  } else if (lux <= 500 && state != 1) {
    dirc = 0; // direction for servo to run
    time = 3000; //time for servo to run in, , change this variable if you need your servo to rotate longer or shorter 
    Serial.println("Auto NIGHT routine. Blind down.");
    newState = 4;
  }

  // Map state and prevstate to their corresponding meanings
  String stateString, prevstateString;
  switch(state) {
    case 1:
      stateString = "Opened manually";
      break;
    case 2:
      stateString = "Closed manually";
      break;
    case 3:
      stateString = "Opened Automatically";
      break;
    case 4:
      stateString = "Closed Automatically";
      break;
    default:
      stateString = "Unknown";
      break;
  }

  switch(prevstate) {
    case 1:
      prevstateString = "Opened manually";
      break;
    case 2:
      prevstateString = "Closed manually";
      break;
    case 3:
      prevstateString = "Opened Automatically";
      break;
    case 4:
      prevstateString = "Closed Automatically";
      break;
    default:
      prevstateString = "Unknown";
      break;
  }

  // If the newState is different from the state, execute servo controls
  if (newState != state) {
    prevstate = state; // Update prevstate to current state
    state = newState; // Update state to newState
    ldr_press();
  }
    
    // Print values
    Serial.print("Button1_value: ");
    Serial.print(button1_value);
    Serial.print("| Button2_value: ");
    Serial.print(button2_value);
    Serial.print("| Light Reading lux: ");
    Serial.print(lux);
    Serial.print(" | State: ");
    Serial.print(stateString);
    Serial.print("| Prevstate: ");
    Serial.println(prevstateString);
  
  // Delay for 3 seconds
  delay(3000);
}

void ldr_press() {
  
  Serial.println("State Change. Rotating Servo");
  myservo.attach(servoPin);
  myservo.write(dirc);
  delay(time);
  myservo.detach();

  //delay(5000); // Change this to 900000 if you want 15 minutes between cycles
}