import datetime
import os
import yaml
from dataclasses import asdict, dataclass, field
from typing import List, Union

from django.core.exceptions import ImproperlyConfigured

from utilities.datetime import datetime_from_timestamp

RELEASE_PATH = 'release.yaml'
LOCAL_RELEASE_PATH = 'local/release.yaml'


@dataclass
class FeatureSet:
    """
    A map of all available NetBox features.
    """
    # Commercial support is provided by NetBox Labs
    commercial: bool = False

    # Live help center is enabled
    help_center: bool = False


@dataclass
class ReleaseInfo:
    version: str
    edition: str
    published: Union[datetime.date, None] = None
    designation: Union[str, None] = None
    features: FeatureSet = field(default_factory=FeatureSet)

    @property
    def full_version(self):
        if self.designation:
            return f"{self.version}-{self.designation}"
        return self.version

    @property
    def name(self):
        return f"NetBox {self.edition} v{self.full_version}"

    def asdict(self):
        return asdict(self)


def load_release_data():
    """
    Load any locally-defined release attributes and return a ReleaseInfo instance.
    """
    base_path = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

    # Load canonical release attributes
    with open(os.path.join(base_path, RELEASE_PATH), 'r') as release_file:
        data = yaml.safe_load(release_file)

    # Overlay any local release date (if defined)
    try:
        with open(os.path.join(base_path, LOCAL_RELEASE_PATH), 'r') as release_file:
            local_data = yaml.safe_load(release_file)
    except FileNotFoundError:
        local_data = {}
    if local_data is not None:
        if type(local_data) is not dict:
            raise ImproperlyConfigured(
                f"{LOCAL_RELEASE_PATH}: Local release data must be defined as a dictionary."
            )
        data.update(local_data)

    # Convert the published date to a date object
    if 'published' in data:
        data['published'] = datetime_from_timestamp(data['published'])

    return ReleaseInfo(**data)