# -*- coding: utf-8  -*-

__all__ = ["Universe"]

class _SolarSystem:
    """Represents a solar system."""

    def __init__(self, universe, sid, data):
        self._universe = universe
        self._id = sid
        self._data = data

    @property
    def id(self):
        """The solar system's ID, as an integer."""
        return self._id

    @property
    def name(self):
        """The solar system's name, as a string."""
        return self._data["name"]

    @property
    def constellation(self):
        """The solar system's constellation, as a _Constellation object."""
        return self._universe.constellation(self._data["constellation"])

    @property
    def region(self):
        """The solar system's region, as a _Region object."""
        return self._universe.region(self._data["region"])

    @property
    def security(self):
        """The solar system's security status, as a float."""
        return self._data["security"]


class _Constellation:
    """Represents a constellation."""

    def __init__(self, universe, cid, data):
        self._universe = universe
        self._id = cid
        self._data = data

    @property
    def id(self):
        """The constellation's ID, as an integer."""
        return self._id

    @property
    def name(self):
        """The constellation's name, as a string."""
        return self._data["name"]

    @property
    def region(self):
        """The constellation's region, as a _Region object."""
        return self._universe.region(self._data["region"])


class _Region:
    """Represents a region."""

    def __init__(self, universe, rid, data):
        self._universe = universe
        self._id = rid
        self._data = data

    @property
    def id(self):
        """The region's ID, as an integer."""
        return self._id

    @property
    def name(self):
        """The region's name, as a string."""
        return self._data["name"]


class _DummySolarSystem(_SolarSystem):
    """Represents an unknown or invalid solar system."""

    def __init__(self, universe):
        super().__init__(universe, -1, {
            "name": "Unknown",
            "constellation": -1,
            "region": -1,
            "security": 0.0
        })


class _DummyConstellation(_Constellation):
    """Represents an unknown or invalid constellation."""

    def __init__(self, universe):
        super().__init__(universe, -1, {
            "name": "Unknown",
            "region": -1
        })


class _DummyRegion(_Region):
    """Represents an unknown or invalid region."""

    def __init__(self, universe):
        super().__init__(universe, -1, {
            "name": "Unknown"
        })


class Universe:
    """EVE API module for static universe data."""

    def __init__(self, datadir):
        self._dir = datadir

    def system(self, sid):
        """Return a _SolarSystem with the given ID.

        If the ID is invalid, return a dummy unknown object with ID -1.
        """
        ...
        return _DummySolarSystem(self)

    def constellation(self, cid):
        """Return a _Constellation with the given ID.

        If the ID is invalid, return a dummy unknown object with ID -1.
        """
        ...
        return _DummyConstellation(self)

    def region(self, rid):
        """Return a _Region with the given ID.

        If the ID is invalid, return a dummy unknown object with ID -1.
        """
        ...
        return _DummyRegion(self)