# -*- coding: utf-8 -*-
# Copyright (c) 2013 by Pablo Martín <goinnn@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this programe.  If not, see <http://www.gnu.org/licenses/>.

from __future__ import annotations

from collections import UserList
from typing import Optional, Union

from django.db.models.sql.query import Query


class _FakeSqlVal(UserList):

    contains_aggregate = False
    contains_column_references = False
    contains_over_clause = False

    def __str__(self):
        return ','.join(map(str, self))


class MSFList(list):

    def __init__(self, choices, *args, **kwargs):
        self.choices = choices
        super(MSFList, self).__init__(*args, **kwargs)

    def __str__(msgl):
        msg_list = [
            msgl.choices.get(int(i)) if i.isdigit() else msgl.choices.get(i)
            for i in msgl]
        return ', '.join(str(s) for s in msg_list)

    def resolve_expression(
            self, query: Query = None, allow_joins: bool = True,
            reuse: Optional[bool] = None, summarize: bool = False,
            for_save: bool = False) -> Union[list, _FakeSqlVal]:
        if for_save:
            result = _FakeSqlVal(self)
        else:
            result = list(self)
        return result


def get_max_length(choices, max_length, default=200):
    if max_length is None:
        if choices:
            return len(','.join([str(key) for key, label in choices]))
        else:
            return default
    return max_length