"""Test Posting methods"""
# 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 pytest

from . import testutil

from beancount.core import data as bc_data

from conservancy_beancount import data

@pytest.fixture
def simple_txn(index=None, key=None):
    return testutil.Transaction(note='txn note', postings=[
        ('Assets:Cash', 5),
        ('Income:Donations', -5, {'note': 'donation love', 'extra': 'Extra'}),
    ])

def test_from_beancount():
    txn = testutil.Transaction(payee='Smith-Dakota', postings=[
        ('Income:Donations', -50),
        ('Assets:Cash', 50, {'receipt': 'cash-donation.pdf'}),
    ])
    post = data.Posting.from_beancount(txn, 1)
    # We don't just want to assert isinstance(post.attr, data.SomeClass);
    # we also want to double-check that attributes were instantiated correctly.
    assert post.account.is_under('Assets:Cash')
    assert post.meta['receipt'] == 'cash-donation.pdf'
    assert post.meta['entity'] == 'Smith-Dakota'
    assert post.meta.date == testutil.FY_MID_DATE

def test_setting_metadata_propagates_to_source(simple_txn):
    src_post = simple_txn.postings[1]
    post = data.Posting.from_beancount(simple_txn, 1)
    post.meta['edited'] = 'yes'
    assert src_post.meta['edited'] == 'yes'
    assert not isinstance(src_post.meta, data.PostingMeta)

def test_deleting_metadata_propagates_to_source(simple_txn):
    post = data.Posting.from_beancount(simple_txn, 1)
    del post.meta['extra']
    assert 'extra' not in simple_txn.postings[1].meta

def test_from_txn(simple_txn):
    for source, post in zip(simple_txn.postings, data.Posting.from_txn(simple_txn)):
        assert all(source[x] == post[x] for x in range(len(source) - 1))
        assert isinstance(post.account, data.Account)
        assert post.meta['note']  # Only works with PostingMeta

def test_from_entries_two_txns(simple_txn):
    entries = [simple_txn, simple_txn]
    sources = [post for txn in entries for post in txn.postings]
    for source, post in zip(sources, data.Posting.from_entries(entries)):
        assert all(source[x] == post[x] for x in range(len(source) - 1))
        assert isinstance(post.account, data.Account)
        assert post.meta['note']  # Only works with PostingMeta

def test_from_entries_mix_txns_and_other_directives(simple_txn):
    meta = {
        'filename': __file__,
        'lineno': 75,
    }
    entries = [
        bc_data.Commodity(meta, testutil.FY_START_DATE, 'EUR'),
        bc_data.Commodity(meta, testutil.FY_START_DATE, 'USD'),
        simple_txn,
    ]
    for source, post in zip(simple_txn.postings, data.Posting.from_entries(entries)):
        assert all(source[x] == post[x] for x in range(len(source) - 1))
        assert isinstance(post.account, data.Account)
        assert post.meta['note']  # Only works with PostingMeta