#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>

#define SERIAL_PORT "/dev/ttyACM0"  // Change this to match your Arduino's serial port

int main() {
    int serial_port = open(SERIAL_PORT, O_RDWR);  // Open the serial port

    // Error handling for opening serial port
    if (serial_port < 0) {
        perror("Error opening serial port");
        return 1;
    }

    // Configure serial port settings
    struct termios tty;
    memset(&tty, 0, sizeof(tty));
    if (tcgetattr(serial_port, &tty) != 0) {
        perror("Error from tcgetattr");
        return 1;
    }
    cfsetospeed(&tty, B9600);  // Set baud rate
    cfsetispeed(&tty, B9600);
    tty.c_cflag &= ~PARENB;    // 8N1 (8 data bits, no parity, 1 stop bit)
    tty.c_cflag &= ~CSTOPB;
    tty.c_cflag &= ~CSIZE;
    tty.c_cflag |= CS8;
    tty.c_cflag &= ~CRTSCTS;   // Disable hardware flow control
    tty.c_cc[VMIN] = 1;        // Read at least 1 character
    tty.c_cc[VTIME] = 5;       // Wait up to 0.5 seconds (5 deciseconds)

    // Apply settings
    if (tcsetattr(serial_port, TCSANOW, &tty) != 0) {
        perror("Error from tcsetattr");
        return 1;
    }

    char buf[5];  // Buffer to store received string (+1 for null terminator)
    ssize_t n;
    
    //TODO: Read from Arduino negative Temperature value in the form of 

        n = read(serial_port, &buf, 4);
        close(serial_port);  // Close the serial port
    return 0;
}