# The Mia! Accounting Flask Project.
# Author: imacat@mail.imacat.idv.tw (imacat), 2023/1/30

#  Copyright (c) 2023 imacat.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
"""The account query.

"""
import sqlalchemy as sa
from flask import request

from accounting.utils.query import parse_query_keywords
from .models import Account, AccountL10n


def get_account_query() -> list[Account]:
    """Returns the accounts, optionally filtered by the query.

    :return: The accounts.
    """
    keywords: list[str] = parse_query_keywords(request.args.get("q"))
    if len(keywords) == 0:
        return Account.query.order_by(Account.base_code, Account.no).all()
    code: sa.BinaryExpression = Account.base_code + "-" \
        + sa.func.substr("000" + sa.cast(Account.no, sa.String),
                         sa.func.char_length(sa.cast(Account.no,
                                                     sa.String)) + 1)
    conditions: list[sa.BinaryExpression] = []
    for k in keywords:
        l10n: list[AccountL10n] = AccountL10n.query\
            .filter(AccountL10n.title.contains(k)).all()
        l10n_matches: set[str] = {x.account_id for x in l10n}
        conditions.append(sa.or_(Account.base_code.contains(k),
                                 Account.title_l10n.contains(k),
                                 code.contains(k),
                                 Account.id.in_(l10n_matches)))

    return Account.query.filter(*conditions)\
        .order_by(Account.base_code, Account.no).all()