# The Mia! Accounting Flask Project.
# Author: imacat@mail.imacat.idv.tw (imacat), 2023/2/18

#  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 queries for the transaction management.

"""
from datetime import datetime

import sqlalchemy as sa
from flask import request

from accounting.models import Transaction
from accounting.utils.query import parse_query_keywords


def get_transaction_query() -> list[Transaction]:
    """Returns the transactions, optionally filtered by the query.

    :return: The transactions.
    """
    keywords: list[str] = parse_query_keywords(request.args.get("q"))
    if len(keywords) == 0:
        return Transaction.query\
            .order_by(Transaction.date, Transaction.no).all()
    conditions: list[sa.BinaryExpression] = []
    for k in keywords:
        sub_conditions: list[sa.BinaryExpression] \
            = [Transaction.note.contains(k)]
        date: datetime
        try:
            date = datetime.strptime(k, "%Y")
            sub_conditions.append(
                sa.extract("year", Transaction.date) == date.year)
        except ValueError:
            pass
        try:
            date = datetime.strptime(k, "%Y/%m")
            sub_conditions.append(sa.and_(
                sa.extract("year", Transaction.date) == date.year,
                sa.extract("month", Transaction.date) == date.month))
        except ValueError:
            pass
        try:
            date = datetime.strptime(f"2000/{k}", "%Y/%m/%d")
            sub_conditions.append(sa.and_(
                sa.extract("month", Transaction.date) == date.month,
                sa.extract("day", Transaction.date) == date.day))
        except ValueError:
            pass
        conditions.append(sa.or_(*sub_conditions))
    return Transaction.query.filter(*conditions)\
        .order_by(Transaction.date, Transaction.no).all()