# Import the os and re modules
import os
import re

# Define the directory where the csv files are located
directory = "."

# Define a function to remove invalid characters from a csv file
def remove_invalid_chars(file):
    # Open the file in read mode with UTF-8 encoding and ignore errors
    with open(file, "r", encoding="utf-8", errors="ignore") as infile:
        # Read the file content as a string
        content = infile.read()
        # Remove any null bytes from the string
        content = content.replace("\x00", "")
        # Remove any non-printable characters from the string
        # content = re.sub(r"[^\x20-\x7E]", "", content)
    # Open the file in write mode with UTF-8 encoding
    with open(file, "w", encoding="utf-8") as outfile:
        # Write the modified content to the file
        outfile.write(content)

# Loop through each file in the directory
for file in os.listdir(directory):
    # Check if the file is a csv file
    if file.endswith(".csv"):
        # Remove invalid characters from the csv file and print the result
        print(f"Removing invalid characters from {file}...")
        remove_invalid_chars(os.path.join(directory, file))
        print(f"{file} is cleaned.")