import json
import serial
import os
import sys
import time

# Function to clear the screen
def clear_screen():
    if os.name == 'nt':  # for Windows
        _ = os.system('cls')
    else:  # for macOS and Linux(here, os.name is 'posix')
        _ = os.system('clear')

# Setup serial connection
serial_port = '/dev/ttyACM0'
baud_rate = 9600  # Adjust this depending on your device

try:
    ser = serial.Serial(serial_port, baud_rate)
    print("Serial port opened successfully. Reading data...")
    buffer = ''  # Initialize a buffer to accumulate data

    while True:
        data_in = ser.read(ser.inWaiting() or 1)  # Read available data or block for one byte
        if data_in:
            # Decode byte to string and accumulate in buffer
            buffer += data_in.decode('utf-8')
            
            # Check if a complete message has been received (indicated by a newline)
            if '\n' in buffer:
                # Split buffer at the first newline; [0] is the complete message, [1] is the start of the next message
                complete_message, buffer = buffer.split('\n', 1)
                
                # Clear the screen before printing new values
                clear_screen()
                
                # Attempt to parse the JSON string
                try:
                    data_dict = json.loads(complete_message)
                    data_array = data_dict["data"]
                    
                    # Print each value in the data array as separate rows
                    for i, value in enumerate(data_array, start=1):
                        print(f"Channel {i}: {value}")
                except json.JSONDecodeError:
                    print("Error decoding JSON. Check the format of the incoming data.")

except serial.SerialException as e:
    print(f"Error opening serial port: {e}")
except KeyboardInterrupt:
    print("Program terminated by user.")
finally:
    ser.close()  # Ensure the serial port is closed on exit