"""Test PostingMeta class"""
# 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 conservancy_beancount import data

@pytest.fixture
def simple_txn():
    return testutil.Transaction(note='txn note', postings=[
        ('Assets:Cash', 5),
        ('Income:Donations', -5, {'note': 'donation love', 'extra': 'Extra'}),
    ])
SIMPLE_TXN_METAKEYS = frozenset(['filename', 'lineno', 'note'])

@pytest.fixture
def payee_txn():
    return testutil.Transaction(payee='SampleCo', postings=[
        ('Assets:Receivable:Accounts', -100),
        ('Assets:Checking', 95),
        ('Expenses:BankingFees', 5, {'entity': 'MyBank'}),
    ])

def test_getitem_transaction(simple_txn):
    assert data.PostingMeta(simple_txn, 0)['note'] == 'txn note'

def test_getitem_posting(simple_txn):
    assert data.PostingMeta(simple_txn, 1)['note'] == 'donation love'

def test_getitem_keyerror(simple_txn):
    with pytest.raises(KeyError):
        data.PostingMeta(simple_txn, 1)['InvalidMetadata']

def test_setitem_overwrite(simple_txn):
    meta = data.PostingMeta(simple_txn, 1)
    meta['note'] = 'overwritten'
    assert meta['note'] == 'overwritten'
    assert data.PostingMeta(simple_txn, 0)['note'] == 'txn note'

def test_setitem_over_txn(simple_txn):
    meta = data.PostingMeta(simple_txn, 0)
    meta['note'] = 'overwritten'
    assert meta['note'] == 'overwritten'
    assert simple_txn.meta['note'] == 'txn note'
    assert data.PostingMeta(simple_txn, 1)['note'] == 'donation love'

def test_setitem_new_meta(simple_txn):
    meta = data.PostingMeta(simple_txn, 0)
    meta['newkey'] = 'testvalue'
    assert meta['newkey'] == 'testvalue'
    assert 'newkey' not in simple_txn.meta
    assert 'newkey' not in simple_txn.postings[1].meta

def test_delitem(simple_txn):
    meta = data.PostingMeta(simple_txn, 1)
    del meta['note']
    assert 'note' not in simple_txn.postings[1].meta

def test_delitem_fails_on_txn_meta(simple_txn):
    meta = data.PostingMeta(simple_txn, 0)
    with pytest.raises(KeyError):
        del meta['note']

def test_len_with_empty_post_meta(simple_txn):
    assert len(data.PostingMeta(simple_txn, 0)) == len(SIMPLE_TXN_METAKEYS)

def test_len_with_post_meta_over_txn(simple_txn):
    assert len(data.PostingMeta(simple_txn, 1)) == len(SIMPLE_TXN_METAKEYS) + 1

def test_iter_with_empty_post_meta(simple_txn):
    assert set(data.PostingMeta(simple_txn, 0)) == SIMPLE_TXN_METAKEYS

def test_iter_with_post_meta_over_txn(simple_txn):
    assert set(data.PostingMeta(simple_txn, 1)) == SIMPLE_TXN_METAKEYS.union(['extra'])

def test_get_links_from_txn(simple_txn):
    meta = data.PostingMeta(simple_txn, 0)
    assert list(meta.get_links('note')) == ['txn', 'note']

def test_get_links_from_post_override(simple_txn):
    meta = data.PostingMeta(simple_txn, 1)
    assert list(meta.get_links('note')) == ['donation', 'love']

def test_payee_used_as_entity(payee_txn):
    actual = [data.PostingMeta(payee_txn, n, p)['entity']
              for n, p in enumerate(payee_txn.postings)]
    assert actual == ['SampleCo', 'SampleCo', 'MyBank']

def test_entity_metadata_has_precedence_over_payee(payee_txn):
    payee_txn.meta['entity'] = 'ExampleCo'
    actual = [data.PostingMeta(payee_txn, n, p)['entity']
              for n, p in enumerate(payee_txn.postings)]
    assert actual == ['ExampleCo', 'ExampleCo', 'MyBank']

def test_keyerror_when_no_entity_or_payee(simple_txn):
    meta = data.PostingMeta(simple_txn, 1)
    with pytest.raises(KeyError):
        meta['entity']

@pytest.mark.parametrize('date', [
    testutil.FUTURE_DATE,
    testutil.FY_START_DATE,
    testutil.FY_MID_DATE,
    testutil.PAST_DATE,
])
def test_date(date):
    txn = testutil.Transaction(date=date, postings=[
        ('Income:Donations', -15),
        ('Assets:Cash', 15),
    ])
    for index, post in enumerate(txn.postings):
        assert data.PostingMeta(txn, index, post).date == date

# The .get() tests are arguably testing the stdlib, but they're short and
# they confirm that we're using the stdlib as we intend.
def test_get_with_meta_value(simple_txn):
    assert data.PostingMeta(simple_txn, 1).get('note') == 'donation love'

def test_get_with_txn_value(simple_txn):
    assert data.PostingMeta(simple_txn, 0).get('note') == 'txn note'

def test_get_with_no_value(simple_txn):
    assert data.PostingMeta(simple_txn, 0).get('extra') is None

def test_get_with_specified_default(simple_txn):
    assert data.PostingMeta(simple_txn, 0).get('extra', 'blank') == 'blank'