import os
import argparse
import base64
import http.server
import socket
import socketserver
import qrcode

def get_current_ip_address():
  s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
  s.connect(("8.8.8.8", 80))
  ip_address = s.getsockname()[0]
  s.close()
  return  ip_address

# Define the command-line arguments
parser = argparse.ArgumentParser(description='Start a simple HTTP server with basic authentication.')
parser.add_argument('--port', type=int, default = 8000, help = 'Port to serve the directory over.')
parser.add_argument('--username', required=True, help='Username for basic authentication.')
parser.add_argument('--password', required=True, help='Password for basic authentication.')
parser.add_argument('--directory', default=os.getcwd(), help='Directory to serve. Defaults to the current directory.')
args = parser.parse_args()

# Expand the directory path (e.g., if it contains ~)
expanded_directory = os.path.expanduser(args.directory)

# Change the working directory to serve the specified directory
os.chdir(expanded_directory)



# Define a request handler with basic authentication
class AuthHandler(http.server.SimpleHTTPRequestHandler):
    def do_AUTHHEAD(self):
        self.send_response(401)
        self.send_header('WWW-Authenticate', 'Basic realm="Server Access"')
        self.send_header('Content-type', 'text/html')
        self.end_headers()

    def do_GET(self):
        auth_header = self.headers.get('Authorization')
        if auth_header is None or not self.check_auth(auth_header):
            self.do_AUTHHEAD()
            self.wfile.write(b'Not authenticated')
        else:
            super().do_GET()

    def check_auth(self, auth_header):
        encoded_credentials = auth_header.split()[1]
        decoded_credentials = base64.b64decode(encoded_credentials).decode('utf-8')
        username, password = decoded_credentials.split(':')
        return username == args.username and password == args.password

def save_qr_code(url):
  # Generate the QR code
  qr = qrcode.QRCode(
      version=1,
      error_correction=qrcode.constants.ERROR_CORRECT_L,
      box_size=10,
      border=4,
  )
  qr.add_data(url)
  qr.make(fit=True)
  # Create an image from the QR Code instance
  img = qr.make_image(fill_color='black', back_color='white').convert('RGB')
  # Save the image
  img.save("qrcode.png")

# Set up the server with the AuthHandler and the defined port
with socketserver.TCPServer(("", args.port), AuthHandler) as httpd:
    print("qrcode.png is saved in the current directory.")
    ip_address = get_current_ip_address()
    print(f"http://{args.username}:{args.password}@{ip_address}:{args.port}/ < the page")
    print(f"http://{args.username}:{args.password}@{ip_address}:{args.port}/qrcode.png < qrcode")
    save_qr_code(f"http://{args.username}:{args.password}@{ip_address}:{args.port}/")
    httpd.serve_forever()