"""Test Metadata 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(index=None, key=None):
    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'])

def test_metadata_transforms_source():
    source = {'1': 'one'}
    meta = data.Metadata(source)
    meta['2'] = 'two'
    assert source['2'] == 'two'
    del meta['1']
    assert set(source) == {'2'}

@pytest.mark.parametrize('value', [
    '',
    'link',
    '  link',
    'link  ',
    'link1  link2',
    ' link1  link2   link3    ',
])
def test_get_links(value):
    meta = data.Metadata({'key': value})
    assert list(meta.get_links('key')) == value.split()

def test_get_links_missing():
    meta = data.Metadata({})
    assert not meta.get_links('key')

@pytest.mark.parametrize('value', testutil.NON_STRING_METADATA_VALUES)
def test_get_links_bad_type(value):
    meta = data.Metadata({'key': value})
    with pytest.raises(TypeError):
        meta.get_links('key')

def test_first_link_from_txn(simple_txn):
    meta = data.PostingMeta(simple_txn, 0)
    assert meta.first_link('note') == 'txn'

def test_first_link_from_post_override(simple_txn):
    meta = data.PostingMeta(simple_txn, 1)
    assert meta.first_link('note') == 'donation'

def test_first_link_is_only_link(simple_txn):
    meta = data.PostingMeta(simple_txn, 1)
    assert meta.first_link('extra') == 'Extra'

def test_first_link_nonexistent_metadata(simple_txn):
    meta = data.PostingMeta(simple_txn, 1)
    assert meta.first_link('Nonexistent') is None

def test_first_link_nonexistent_default(simple_txn):
    meta = data.PostingMeta(simple_txn, 1)
    assert meta.first_link('Nonexistent', 'missing') == 'missing'

@pytest.mark.parametrize('meta_value', testutil.NON_STRING_METADATA_VALUES)
def test_first_link_bad_type_metadata(simple_txn, meta_value):
    simple_txn.meta['badmeta'] = meta_value
    meta = data.PostingMeta(simple_txn, 1)
    assert meta.first_link('badmeta') is None

@pytest.mark.parametrize('meta_value', testutil.NON_STRING_METADATA_VALUES)
def test_first_link_bad_type_default(simple_txn, meta_value):
    simple_txn.meta['badmeta'] = meta_value
    meta = data.PostingMeta(simple_txn, 1)
    assert meta.first_link('badmeta', '_') == '_'