"""
Alliance Auth User API
"""

from typing import Optional

from django.contrib.auth.models import User

from allianceauth.authentication.models import CharacterOwnership
from allianceauth.eveonline.models import EveCharacter


def get_all_characters_from_user(user: User) -> list:
    """
    Get all characters from a user or an empty list
    when no characters are found for the user or the user is None

    :param user:
    :type user:
    :return:
    :rtype:
    """

    if user is None:
        return []

    try:
        characters = [
            char.character for char in CharacterOwnership.objects.filter(user=user)
        ]
    except AttributeError:
        return []

    return characters


def get_main_character_from_user(user: User) -> Optional[EveCharacter]:
    """
    Get the main character from a user

    :param user:
    :type user:
    :return:
    :rtype:
    """

    if user is None:
        return None

    try:
        main_character = user.profile.main_character
    except AttributeError:
        return None

    return main_character


def get_main_character_name_from_user(user: User) -> str:
    """
    Get the main character name from a user

    :param user:
    :type user:
    :return:
    :rtype:
    """

    if user is None:
        sentinel_user = get_sentinel_user()

        return sentinel_user.username

    main_character = get_main_character_from_user(user=user)

    try:
        username = main_character.character_name
    except AttributeError:
        return str(user)

    return username


def get_sentinel_user() -> User:
    """
    Get the sentinel user or create one

    :return:
    """

    return User.objects.get_or_create(username="deleted")[0]