"""Test metadata for receivables 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_receivable_documentation

TEST_ACCT = 'Assets:Receivable:Accounts'
OTHER_ACCT = 'Income:Donations'

SUPPORTING_METADATA = [
    'approval',
    'contract',
    'purchase-order',
]

NON_SUPPORTING_METADATA = [
    'check',
    'receipt',
    'statement',
]

ISSUED_INVOICE_LINKS = [
    'rt:1/6',
    'rt://ticket/2/attachments/10',
    'Financial/Invoices/Company_invoice-2020030405_as-sent.pdf',
    'Projects/Alpha/Invoices/ProjectInvoice-304567.pdf',
]

RECEIVED_INVOICE_LINKS = [
    'rt:1/4',
    'rt://ticket/2/attachments/14',
    'Financial/Invoices/Invoice-23456789.csv',
    'Projects/Bravo/Invoices/Statement304567.pdf',
]

MISSING_MSG = f"{TEST_ACCT} missing approval/contract/purchase-order"

# for supporting links, use the lists from testutil

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

def seed_meta(invoice=ISSUED_INVOICE_LINKS[0],
              support_values=testutil.NON_LINK_METADATA_STRINGS,
              **kwargs,
):
    meta = dict(testutil.combine_values(
        SUPPORTING_METADATA,
        support_values,
    ))
    meta.update(kwargs)
    meta['invoice'] = invoice
    return meta

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

def check(hook, expected, test_acct=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, amount, post_meta),
        (other_acct, f'-{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('invoice,support_key,support_value', testutil.combine_values(
    ISSUED_INVOICE_LINKS,
    SUPPORTING_METADATA,
    testutil.LINK_METADATA_STRINGS,
))
def test_valid_docs_in_post(hook, invoice, support_key, support_value):
    meta = seed_meta(invoice)
    meta[support_key] = support_value
    check(hook, None, post_meta=meta)

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

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

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

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

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

@pytest.mark.parametrize('invoice,meta_type', testutil.combine_values(
    RECEIVED_INVOICE_LINKS,
    ['post_meta', 'txn_meta'],
))
def test_received_invoices_not_checked(hook, invoice, meta_type):
    check(hook, None, **{meta_type: {'invoice': invoice}})

@pytest.mark.parametrize('invoice,other_acct', testutil.combine_values(
    ISSUED_INVOICE_LINKS,
    ['Assets:Checking', 'Assets:Savings'],
))
def test_paid_invoices_not_checked(hook, invoice, other_acct):
    txn = testutil.Transaction(postings=[
        (TEST_ACCT, -250, {'invoice': invoice}),
        (other_acct, 250),
    ])
    assert not list(hook.run(txn))

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

def test_configuration_error_without_rt():
    config = testutil.TestConfig()
    with pytest.raises(errormod.ConfigurationError):
        meta_receivable_documentation.MetaReceivableDocumentation(config)

def test_not_required_on_opening(hook):
    txn = testutil.Transaction(postings=[
        ('Assets:Receivable:Accounts', 100),
        ('Assets:Receivable:Loans', 200),
        (next(testutil.OPENING_EQUITY_ACCOUNTS), -300),
    ])
    assert not list(hook.run(txn))

def test_not_required_on_flagged(hook):
    post_meta = seed_meta()
    check(hook, None, txn_meta={'flag': '!'}, post_meta=post_meta)