String input;    // Variable to store the incoming string
String value1, value2, value3, value4;  // Variables to store extracted values
int led1 = 15;
int led2 = 2;
int led3 = 0;
int led4 = 4;

void setup() {
  Serial.begin(9600); // Initialize Serial communication
  Serial.println("Send a string in the format T1:1:50:60, L4ON, or L4OFF");
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  digitalWrite(led1, LOW);
  digitalWrite(led2, LOW);
  digitalWrite(led3, LOW);
  digitalWrite(led4, LOW);
}

void loop() {
  // Check if data is available on Serial
  if (Serial.available()) {
    input = Serial.readStringUntil('\n'); // Read the input string until a newline character

    // Check for specific commands to control LED4
    if (input == "L4ON") {
      digitalWrite(led4, HIGH); // Turn LED4 ON
      Serial.println("LED4 is ON");
      return; // Exit the loop to avoid further processing
    } else if (input == "L4OFF") {
      digitalWrite(led4, LOW); // Turn LED4 OFF
      Serial.println("LED4 is OFF");
      return; // Exit the loop to avoid further processing
    }

    // Extract substrings based on the known format
    int firstColon = input.indexOf(':');
    int secondColon = input.indexOf(':', firstColon + 1);
    int thirdColon = input.indexOf(':', secondColon + 1);

    if (firstColon != -1 && secondColon != -1 && thirdColon != -1) {
      value1 = input.substring(0, firstColon);                // Extract "T1"
      value2 = input.substring(firstColon + 1, secondColon);  // Extract "1"
      value3 = input.substring(secondColon + 1, thirdColon);  // Extract "50"
      value4 = input.substring(thirdColon + 1);               // Extract "60"

      // Print extracted values
      Serial.print("Value 1: ");
      Serial.println(value1);
      Serial.print("Value 2: ");
      Serial.println(value2);
      Serial.print("Value 3: ");
      Serial.println(value3);
      Serial.print("Value 4: ");
      Serial.println(value4);

      // Handle LEDs based on extracted values
      if (value1 == "T1") {
        if (value2 == "1") {
          digitalWrite(led1, HIGH); // Turn LED1 ON
        } else if (value2 == "2") {
          digitalWrite(led1, LOW); // Turn LED1 OFF
        }

        if (value3 == "50") {
          digitalWrite(led2, HIGH); // Turn LED2 ON
        } else if (value3 == "60") {
          digitalWrite(led2, LOW); // Turn LED2 OFF
        }
      }
      if (value1 == "T2") {
        if (value2 == "1") {
          digitalWrite(led3, HIGH); // Turn LED3 ON
        } else if (value2 == "2") {
          digitalWrite(led3, LOW); // Turn LED3 OFF
        }
      }
    } else {
      Serial.println("Invalid format! Please send in the format T1:1:50:60, L4ON, or L4OFF");
    }
  }
}