# The Mia! Accounting 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 console commands for the account management.

"""
import typing as t
from secrets import randbelow

import click

from accounting import db
from accounting.models import BaseAccount, Account, AccountL10n
from accounting.utils.user import get_user_pk
import sqlalchemy as sa

AccountData = tuple[int, str, int, str, str, str, bool]
"""The format of the account data, as a list of (ID, base account code, number,
English, Traditional Chinese, Simplified Chinese, is-need-offset) tuples."""


def init_accounts_command(username: str) -> None:
    """Initializes the accounts."""
    creator_pk: int = get_user_pk(username)

    bases: list[BaseAccount] = BaseAccount.query\
        .filter(db.func.length(BaseAccount.code) == 4)\
        .order_by(BaseAccount.code).all()
    if len(bases) == 0:
        raise click.Abort

    existing: list[Account] = Account.query.all()

    existing_base_code: set[str] = {x.base_code for x in existing}
    bases_to_add: list[BaseAccount] = [x for x in bases
                                       if x.code not in existing_base_code]
    if len(bases_to_add) == 0:
        return

    existing_id: set[int] = {x.id for x in existing}

    def get_new_id() -> int:
        """Returns a new random account ID.

        :return: The newly-generated random account ID.
        """
        while True:
            new_id: int = 100000000 + randbelow(900000000)
            if new_id not in existing_id:
                existing_id.add(new_id)
                return new_id

    data: list[dict[str, t.Any]] = []
    l10n_data: list[dict[str, t.Any]] = []
    for base in bases_to_add:
        l10n: dict[str, str] = {x.locale: x.title for x in base.l10n}
        account_id: int = get_new_id()
        data.append({"id": account_id,
                     "base_code": base.code,
                     "no": 1,
                     "title_l10n": base.title_l10n,
                     "is_need_offset": __is_need_offset(base.code),
                     "created_by_id": creator_pk,
                     "updated_by_id": creator_pk})
        for locale in {"zh_Hant", "zh_Hans"}:
            l10n_data.append({"account_id": account_id,
                              "locale": locale,
                              "title": l10n[locale]})
    db.session.execute(sa.insert(Account), data)
    db.session.execute(sa.insert(AccountL10n), l10n_data)


def __is_need_offset(base_code: str) -> bool:
    """Checks that whether journal entry line items in the account need offset.

    :param base_code: The code of the base account.
    :return: True if journal entry line items in the account need offset, or
        False otherwise.
    """
    # Assets
    if base_code[0] == "1":
        if base_code[:3] in {"113", "114", "118", "184", "186"}:
            return True
        if base_code in {"1286", "1411", "1421", "1431", "1441", "1511",
                         "1521", "1581", "1611", "1851"}:
            return True
        return False
    # Liabilities
    if base_code[0] == "2":
        if base_code in {"2111", "2114", "2284", "2293", "2861"}:
            return False
        return True
    # Only assets and liabilities need offset
    return False