import os
import re
import requests

# Telegram Configurations
bot_token = '949332240:AAHNsQEmCW4it86Esa7F5o07XxwrotSM7s8'
chat_id = '-914111351'

# Path to the kernel log
log_file = "/var/log/kern.log"

# File to store last line read
last_line_file = "/tmp/last_line_read.txt"

# Error message to look for
error_msg = "pl2303 ttyUSB0: usb_serial_generic_read_bulk_callback - urb stopped:"

def send_telegram(bot_token, chat_id, message):
    send_text = 'https://api.telegram.org/bot' + bot_token + '/sendMessage?chat_id=' + chat_id + '&parse_mode=Markdown&text=' + message
    response = requests.get(send_text)
    print(response.json())
    return response.json()

def check_log_file(log_file, error_msg, last_line_file):
    last_line_read = 0
    if os.path.exists(last_line_file):
        with open(last_line_file, "r") as f:
            last_line_read = int(f.readline().strip())
    
    with open(log_file, "r") as f:
        log_lines = f.readlines()
    
    # Check if log file was rotated
    if len(log_lines) < last_line_read:
        last_line_read = 0

    for i, line in enumerate(log_lines[last_line_read:]):
        if re.search(error_msg, line):
            with open(last_line_file, "w") as f:
                f.write(str(last_line_read + i))
            return True
    with open(last_line_file, "w") as f:
        f.write(str(len(log_lines)))
    return False

if __name__ == "__main__":
    if check_log_file(log_file, error_msg, last_line_file):
        send_telegram(bot_token, chat_id, "Error detected: serial2usb")