"""
Utility for generating OpenVPN client configuration files.
"""

import os

def generate_client_config(username: str):
    """
    Generates a .ovpn file for a given user.

    Args:
        username: The username for which to generate the config.
    """
    ca_path = "/home/arthur/openvpn-ca/pki/ca.crt"
    ta_path = "/home/arthur/openvpn-ca/ta.key"
    client_crt_path = f"/home/arthur/openvpn-ca/pki/issued/{username}.crt"
    client_key_path = f"/home/arthur/openvpn-ca/pki/private/{username}.key"
    output_path = f"/etc/openvpn/client/{username}.ovpn"

    # Verify that all required files exist
    for f in [ca_path, ta_path, client_crt_path, client_key_path]:
        if not os.path.isfile(f):
            print(f"Error: Cannot read file '{f}'.")
            return

    # Read the content of the files
    try:
        with open(ca_path, 'r') as f:
            ca_content = f.read()
        with open(client_crt_path, 'r') as f:
            client_crt_content = f.read()
        with open(client_key_path, 'r') as f:
            client_key_content = f.read()
        with open(ta_path, 'r') as f:
            ta_content = f.read()
    except IOError as e:
        print(f"Error reading files: {e}")
        return

    # Assemble the .ovpn configuration
    ovpn_config = f"""
client
dev tun
proto udp
remote 14.241.240.102 1194 # use FTP IP address 
resolv-retry infinite
nobind
persist-key
persist-tun
remote-cert-tls server
cipher AES-256-GCM
# push mac address info 
push-peer-info
verb 3

<ca>
{ca_content}
</ca>

<cert>
{client_crt_content}
</cert>

<key>
{client_key_content}
</key>

<tls-auth>
{ta_content}
</tls-auth>
key-direction 1
"""

    # Write the configuration to the output file
    try:
        # Ensure the output directory exists
        output_dir = os.path.dirname(output_path)
        if not os.path.exists(output_dir):
            # This part is tricky because of permissions.
            # For now, we assume the directory exists.
            # On a real server, this would be handled by deployment scripts.
            pass

        with open(output_path, 'w') as f:
            f.write(ovpn_config)
        print(f"Successfully generated client config: {output_path}")
    except IOError as e:
        print(f"Error writing to file: {e}")