"""Create Docker TLSConfig from CertificateKeyPair"""
from pathlib import Path
from tempfile import gettempdir
from typing import Optional

from docker.tls import TLSConfig

from passbook.crypto.models import CertificateKeyPair


class DockerInlineTLS:
    """Create Docker TLSConfig from CertificateKeyPair"""

    verification_kp: Optional[CertificateKeyPair]
    authentication_kp: Optional[CertificateKeyPair]

    def __init__(
        self,
        verification_kp: Optional[CertificateKeyPair],
        authentication_kp: Optional[CertificateKeyPair],
    ) -> None:
        self.verification_kp = verification_kp
        self.authentication_kp = authentication_kp

    def write_file(self, name: str, contents: str) -> str:
        """Wrapper for mkstemp that uses fdopen"""
        path = Path(gettempdir(), name)
        with open(path, "w") as _file:
            _file.write(contents)
        return str(path)

    def write(self) -> TLSConfig:
        """Create TLSConfig with Certificate Keypairs"""
        # So yes, this is quite ugly. But sadly, there is no clean way to pass
        # docker-py (which is using requests (which is using urllib3)) a certificate
        # for verification or authentication as string.
        # Because we run in docker, and our tmpfs is isolated to us, we can just
        # write out the certificates and keys to files and use their paths
        config_args = {}
        if self.verification_kp:
            ca_cert_path = self.write_file(
                f"{self.verification_kp.pk.hex}-cert.pem",
                self.verification_kp.certificate_data,
            )
            config_args["ca_cert"] = ca_cert_path
        if self.authentication_kp:
            auth_cert_path = self.write_file(
                f"{self.authentication_kp.pk.hex}-cert.pem",
                self.authentication_kp.certificate_data,
            )
            auth_key_path = self.write_file(
                f"{self.authentication_kp.pk.hex}-key.pem",
                self.authentication_kp.key_data,
            )
            config_args["client_cert"] = (auth_cert_path, auth_key_path)
        return TLSConfig(**config_args)