"""Test main plugin"""
# 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 beancount_types, errors as errormod, plugin

HOOK_REGISTRY = plugin.HookRegistry()

class NonError(errormod.Error):
    pass


class TransactionHook:
    DIRECTIVE = beancount_types.Transaction
    HOOK_GROUPS = frozenset()

    def __init__(self, config):
        self.config = config

    def run(self, txn):
        assert False, "something called base class run method"


@HOOK_REGISTRY.add_hook
class ConfigurationError(TransactionHook):
    HOOK_GROUPS = frozenset(['unconfigured'])

    def __init__(self, config):
        raise errormod.ConfigurationError("testing error")


@HOOK_REGISTRY.add_hook
class TransactionError(TransactionHook):
    HOOK_GROUPS = frozenset(['configured'])

    def run(self, txn):
        return [NonError('txn:{}'.format(id(txn)), txn)]


@HOOK_REGISTRY.add_hook
class PostingError(TransactionHook):
    HOOK_GROUPS = frozenset(['configured', 'posting'])

    def run(self, txn):
        return [NonError('post:{}'.format(id(post)), txn)
                for post in txn.postings]


@pytest.fixture
def config_map():
    return {}

@pytest.fixture
def easy_entries():
    return [
        testutil.Transaction(postings=[
            ('Income:Donations', -25),
            ('Assets:Cash', 25),
        ]),
        testutil.Transaction(postings=[
            ('Expenses:General', 10),
            ('Liabilites:CreditCard', -10),
        ]),
    ]

def map_errors(errors):
    retval = {}
    for error in errors:
        key, _, errid = error.message.partition(':')
        retval.setdefault(key, set()).add(errid)
    return retval

@pytest.mark.parametrize('group_str,expected', [
    (None, [TransactionError, PostingError]),
    ('', [TransactionError, PostingError]),
    ('all', [TransactionError, PostingError]),
    ('Transaction', [TransactionError, PostingError]),
    ('-posting', [TransactionError]),
    ('-configured posting', [PostingError]),
    ('configured -posting', [TransactionError]),
])
def test_registry_group_by_directive(group_str, expected):
    args = () if group_str is None else (group_str,)
    actual = {hook for _, hook in HOOK_REGISTRY.group_by_directive(*args)}
    assert actual.issuperset(expected)
    if len(expected) == 1:
        assert not (TransactionError in actual and PostingError in actual)

def test_registry_unknown_group_name():
    with pytest.raises(ValueError):
        next(HOOK_REGISTRY.group_by_directive('UnKnownTestGroup'))

def test_run_with_multiple_hooks(easy_entries, config_map):
    out_entries, errors = plugin.run(easy_entries, config_map, '', HOOK_REGISTRY)
    assert len(out_entries) == 2
    errmap = map_errors(errors)
    assert len(errmap.get('txn', '')) == 2
    assert len(errmap.get('post', '')) == 4

def test_run_with_one_hook(easy_entries, config_map):
    out_entries, errors = plugin.run(easy_entries, config_map, 'posting', HOOK_REGISTRY)
    assert len(out_entries) == 2
    errmap = map_errors(errors)
    assert len(errmap.get('txn', '')) == 0
    assert len(errmap.get('post', '')) == 4