"""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, plugin

HOOK_REGISTRY = plugin.HookRegistry()

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

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


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

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


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

    def run(self, txn):
        return ['post:{}'.format(id(post)) 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 hook_types(hooks, key):
    return {type(hook) for hook in hooks[key]}

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

def test_registry_all_by_default():
    hook_groups = HOOK_REGISTRY.group_by_directive()
    hooks = hook_types(hook_groups, 'Transaction')
    assert len(hooks) >= 2
    assert TransactionError in hooks
    assert PostingError in hooks

def test_registry_one_exclude():
    hook_groups = HOOK_REGISTRY.group_by_directive('-posting')
    hooks = hook_types(hook_groups, 'Transaction')
    assert len(hooks) >= 1
    assert TransactionError in hooks
    assert PostingError not in hooks

def test_registry_exclude_then_include():
    hook_groups = HOOK_REGISTRY.group_by_directive('-configured posting')
    hooks = hook_types(hook_groups, 'Transaction')
    assert len(hooks) >= 1
    assert TransactionError not in hooks
    assert PostingError in hooks

def test_registry_include_then_exclude():
    hook_groups = HOOK_REGISTRY.group_by_directive('configured -posting')
    hooks = hook_types(hook_groups, 'Transaction')
    assert len(hooks) >= 1
    assert TransactionError in hooks
    assert PostingError not in hooks

def test_registry_unknown_group_name():
    with pytest.raises(ValueError):
        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