"""passbook outposts app config"""
from importlib import import_module
from os import R_OK, access
from os.path import expanduser
from pathlib import Path
from socket import gethostname
from urllib.parse import urlparse

import yaml
from django.apps import AppConfig
from django.db import ProgrammingError
from docker.constants import DEFAULT_UNIX_SOCKET
from kubernetes.config.incluster_config import SERVICE_TOKEN_FILENAME
from kubernetes.config.kube_config import KUBE_CONFIG_DEFAULT_LOCATION
from structlog import get_logger

LOGGER = get_logger()


class PassbookOutpostConfig(AppConfig):
    """passbook outposts app config"""

    name = "passbook.outposts"
    label = "passbook_outposts"
    mountpoint = "outposts/"
    verbose_name = "passbook Outpost"

    def ready(self):
        import_module("passbook.outposts.signals")
        try:
            PassbookOutpostConfig.init_local_connection()
        except ProgrammingError:
            pass

    @staticmethod
    def init_local_connection():
        """Check if local kubernetes or docker connections should be created"""
        from passbook.outposts.models import (
            KubernetesServiceConnection,
            DockerServiceConnection,
        )

        if Path(SERVICE_TOKEN_FILENAME).exists():
            LOGGER.debug("Detected in-cluster Kubernetes Config")
            if not KubernetesServiceConnection.objects.filter(local=True).exists():
                LOGGER.debug("Created Service Connection for in-cluster")
                KubernetesServiceConnection.objects.create(
                    name="Local Kubernetes Cluster", local=True, kubeconfig={}
                )
        # For development, check for the existence of a kubeconfig file
        kubeconfig_path = expanduser(KUBE_CONFIG_DEFAULT_LOCATION)
        if Path(kubeconfig_path).exists():
            LOGGER.debug("Detected kubeconfig")
            kubeconfig_local_name = f"k8s-{gethostname()}"
            if not KubernetesServiceConnection.objects.filter(
                name=kubeconfig_local_name
            ).exists():
                LOGGER.debug("Creating kubeconfig Service Connection")
                with open(kubeconfig_path, "r") as _kubeconfig:
                    KubernetesServiceConnection.objects.create(
                        name=kubeconfig_local_name,
                        kubeconfig=yaml.safe_load(_kubeconfig),
                    )
        unix_socket_path = urlparse(DEFAULT_UNIX_SOCKET).path
        socket = Path(unix_socket_path)
        if socket.exists() and access(socket, R_OK):
            LOGGER.debug("Detected local docker socket")
            if not DockerServiceConnection.objects.filter(local=True).exists():
                LOGGER.debug("Created Service Connection for docker")
                DockerServiceConnection.objects.create(
                    name="Local Docker connection",
                    local=True,
                    url=unix_socket_path,
                )