"""Mock Beancount objects for testing"""

# Copyright © 2020  Brett Smith

#

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU Affero 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 Affero General Public License for more details.

#

# You should have received a copy of the GNU Affero General Public License

# along with this program.  If not, see <https://www.gnu.org/licenses/>.

import datetime

import beancount.core.amount as bc_amount

import beancount.core.data as bc_data

from decimal import Decimal

FY_START_DATE = datetime.date(2020, 3, 1)

FY_MID_DATE = datetime.date(2020, 9, 1)

def parse_date(s, fmt='%Y-%m-%d'):

    return datetime.datetime.strptime(s, fmt).date()

def Posting(account, number,

            currency='USD', cost=None, price=None, flag=None,

            **meta):

    return bc_data.Posting(

        account,

        bc_amount.Amount(Decimal(number), currency),

        cost,

        price,

        flag,

        meta,

    )

class Transaction:

    def __init__(self,

                 date=FY_MID_DATE, flag='*', payee=None,

                 narration='', tags=None, links=None, postings=None,

                 **meta):

        if isinstance(date, str):

            date = parse_date(date)

        self.date = date

        self.flag = flag

        self.payee = payee

        self.narration = narration

        self.tags = set(tags or '')

        self.links = set(links or '')

        self.postings = []

        self.meta = {

            'filename': '<test>',

            'lineno': 0,

        }

        self.meta.update(meta)

        for posting in postings:

            self.add_posting(*posting)

    def add_posting(self, arg, *args, **kwargs):

        """Add a posting to this transaction. Use any of these forms:

           txn.add_posting(account, number, …, kwarg=value, …)

           txn.add_posting(account, number, …, posting_kwargs_dict)

           txn.add_posting(posting_object)

        """

        if kwargs:

            posting = Posting(arg, *args, **kwargs)

        elif args:

            if isinstance(args[-1], dict):

                kwargs = args[-1]

                args = args[:-1]

            posting = Posting(arg, *args, **kwargs)

        else:

            posting = arg

        self.postings.append(posting)