"""Test metadata for payables includes supporting documentation"""
# 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 random

import pytest

from . import testutil

from conservancy_beancount import errors as errormod
from conservancy_beancount.plugin import meta_payable_documentation

ACCOUNTS = [
    'Liabilities:Payable:Accounts',
    'Liabilities:Payable:Vacation',
]

SUPPORTING_METADATA = [
    'approval',
    'contract',
]

NON_SUPPORTING_METADATA = [
    'check',
    'invoice',
    'purchase-order',
    'receipt',
    'statement',
]

OTHER_ACCT = 'Expenses:Other'
MISSING_MSG = f"{{}} missing approval/contract".format

# for supporting links, use the lists from testutil

@pytest.fixture(scope='module')
def hook():
    config = testutil.TestConfig(rt_client=testutil.RTClient())
    return meta_payable_documentation.MetaPayableDocumentation(config)

def seed_meta(support_values=testutil.NON_LINK_METADATA_STRINGS, **kwargs):
    meta = dict(testutil.combine_values(
        SUPPORTING_METADATA,
        support_values,
    ))
    meta.update(kwargs)
    return meta

def wrong_type_message(acct, key, wrong_value):
    return  "{} has wrong type of {}: expected str but is a {}".format(
        acct,
        key,
        type(wrong_value).__name__,
    )

def check(hook, expected, test_acct, other_acct=OTHER_ACCT, *,
          txn_meta={}, post_meta={}, min_amt=10):
    amount = '{:.02f}'.format(min_amt + random.random() * 100)
    txn = testutil.Transaction(**txn_meta, postings=[
        (test_acct, f'-{amount}', post_meta),
        (other_acct, amount),
    ])
    actual = {error.message for error in hook.run(txn)}
    if expected is None:
        assert not actual
    elif isinstance(expected, str):
        assert expected in actual
    else:
        assert actual == expected

@pytest.mark.parametrize('acct,support_key,support_value', testutil.combine_values(
    ACCOUNTS,
    SUPPORTING_METADATA,
    testutil.LINK_METADATA_STRINGS,
))
def test_valid_docs_in_post(hook, acct, support_key, support_value):
    meta = seed_meta()
    meta[support_key] = support_value
    check(hook, None, acct, post_meta=meta)

@pytest.mark.parametrize('acct,support_key,support_value', testutil.combine_values(
    ACCOUNTS,
    SUPPORTING_METADATA,
    testutil.LINK_METADATA_STRINGS,
))
def test_valid_docs_in_txn(hook, acct, support_key, support_value):
    meta = seed_meta()
    meta[support_key] = support_value
    check(hook, None, acct, txn_meta=meta)

@pytest.mark.parametrize('acct,meta_type', testutil.combine_values(
    ACCOUNTS,
    ['post_meta', 'txn_meta'],
))
def test_no_valid_docs(hook, acct, meta_type):
    meta = seed_meta()
    meta.update((key, value) for key, value in testutil.combine_values(
        NON_SUPPORTING_METADATA,
        testutil.LINK_METADATA_STRINGS,
    ))
    check(hook, {MISSING_MSG(acct)}, acct, **{meta_type: meta})

@pytest.mark.parametrize('acct,meta_type', testutil.combine_values(
    ACCOUNTS,
    ['post_meta', 'txn_meta'],
))
def test_docs_all_bad_type(hook, acct, meta_type):
    meta = seed_meta(testutil.NON_STRING_METADATA_VALUES)
    expected = {
        wrong_type_message(acct, key, value)
        for key, value in meta.items()
    }
    expected.add(MISSING_MSG(acct))
    check(hook, expected, acct, **{meta_type: meta})

@pytest.mark.parametrize('acct,support_key,support_value', testutil.combine_values(
    ACCOUNTS,
    SUPPORTING_METADATA,
    testutil.LINK_METADATA_STRINGS,
))
def test_type_errors_reported_with_valid_post_docs(hook, acct, support_key, support_value):
    meta = seed_meta(testutil.NON_STRING_METADATA_VALUES)
    meta[support_key] = support_value
    expected = {
        wrong_type_message(acct, key, value)
        for key, value in meta.items()
        if key != support_key
    }
    check(hook, expected, acct, post_meta=meta)

@pytest.mark.parametrize('acct,support_key,support_value', testutil.combine_values(
    ACCOUNTS,
    SUPPORTING_METADATA,
    testutil.LINK_METADATA_STRINGS,
))
def test_type_errors_reported_with_valid_txn_docs(hook, acct, support_key, support_value):
    meta = seed_meta(testutil.NON_STRING_METADATA_VALUES)
    meta[support_key] = support_value
    expected = {
        wrong_type_message(acct, key, value)
        for key, value in meta.items()
        if key != support_key
    }
    check(hook, expected, acct, txn_meta=meta)

@pytest.mark.parametrize('acct,other_acct', testutil.combine_values(
    ACCOUNTS,
    ['Assets:Checking', 'Liabilities:CreditCard'],
))
def test_paid_accts_not_checked(hook, acct, other_acct):
    txn = testutil.Transaction(postings=[
        (acct, 250),
        (other_acct, -250),
    ])
    assert not list(hook.run(txn))

@pytest.mark.parametrize('account', [
    'Assets:Bank:Checking',
    'Assets:Cash',
    'Assets:Receivable:Accounts',
    'Equity:OpeningBalance',
    'Expenses:BankingFees',
    'Income:Donations',
    'Liabilities:CreditCard',
    'Liabilities:UnearnedIncome:Donations',
])
def test_does_not_apply_to_other_accounts(hook, account):
    meta = seed_meta()
    check(hook, None, account, post_meta=meta)