"""test_reports_query.py - Unit tests for query report"""

# Copyright © 2021  Brett Smith

# License: AGPLv3-or-later WITH Beancount-Plugin-Additional-Permission-1.0

#

# Full copyright and licensing details can be found at toplevel file

# LICENSE.txt in the repository.

import argparse

import collections

import copy

import csv

import datetime

import io

import itertools

import re

import pytest

from . import testutil

from conservancy_beancount.books import FiscalYear

from conservancy_beancount.reports import query as qmod

from decimal import Decimal

class MockRewriteRuleset:

    def __init__(self, multiplier=2):

        self.multiplier = multiplier

    def rewrite(self, posts):

        for post in posts:

            number, currency = post.units

            number *= self.multiplier

            yield post._replace(units=testutil.Amount(number, currency))

@pytest.fixture(scope='module')

def fy():

    return FiscalYear(3, 1)

def pipe_main(arglist, config):

    stdout = io.StringIO()

    stderr = io.StringIO()

    returncode = qmod.main(arglist, stdout, stderr, config)

    return returncode, stdout, stderr

def query_args(query=None, start_date=None, stop_date=None, join='AND'):

    join = qmod.JoinOperator[join]

    return argparse.Namespace(**locals())

def test_books_loader_empty():

    result = qmod.BooksLoader(None)()

    assert not result.entries

    assert len(result.errors) == 1

def test_books_loader_plain():

    books_path = testutil.test_path(f'books/books/2018.beancount')

    loader = testutil.TestBooksLoader(books_path)

    result = qmod.BooksLoader(loader)()

    assert not result.errors

    assert result.entries

    min_date = datetime.date(2018, 3, 1)

    assert all(ent.date >= min_date for ent in result.entries)

def test_books_loader_rewrites():

    rewrites = [MockRewriteRuleset()]

    books_path = testutil.test_path(f'books/books/2018.beancount')

    loader = testutil.TestBooksLoader(books_path)

    result = qmod.BooksLoader(loader, None, None, rewrites)()

    assert not result.errors

    assert result.entries

    numbers = frozenset(

        abs(post.units.number)

        for entry in result.entries

        for post in getattr(entry, 'postings', ())

    )

    assert numbers

    assert all(abs(number) >= 40 for number in numbers)

@pytest.mark.parametrize('file_s', [None, '', ' \n \n\n'])

def test_build_query_empty(fy, file_s):

    args = query_args()

    if file_s is None:

        query = qmod.build_query(args, fy)

    else:

        with io.StringIO(file_s) as qfile:

            query = qmod.build_query(args, fy, qfile)

    assert query is None

@pytest.mark.parametrize('query_str', [

    'SELECT * WHERE date >= 2018-03-01',

    'select *',

    'JOURNAL "Income:Donations"',

    'journal',

    'BALANCES FROM year=2018',

    'balances',

])

def test_build_query_in_arglist(fy, query_str):

    args = query_args(query_str.split(), testutil.PAST_DATE, testutil.FUTURE_DATE)

    assert qmod.build_query(args, fy) == query_str

@pytest.mark.parametrize('count,join_op', enumerate(qmod.JoinOperator, 1))

def test_build_query_where_arglist_conditions(fy, count, join_op):

    conds = ['account ~ "^Income:"', 'year >= 2018'][:count]

    args = query_args(conds, join=join_op.name)

    query = qmod.build_query(args, fy)

    assert query.startswith('SELECT ')

    cond_index = query.index(' WHERE ') + 7

    assert query[cond_index:] == '({})'.format(join_op.join(conds))

@pytest.mark.parametrize('argname,date_arg', itertools.product(

    ['start_date', 'stop_date'],

    [testutil.FY_START_DATE, testutil.FY_START_DATE.year],

))

def test_build_query_one_date_arg(fy, argname, date_arg):

    query_kwargs = {

        argname: date_arg,

        'query': ['flag = "*"', 'flag = "!"'],

        'join': 'OR',

    }

    args = query_args(**query_kwargs)

    query = qmod.build_query(args, fy)

    assert query.startswith('SELECT ')

    cond_index = query.index(' WHERE ') + 7

    if argname == 'start_date':

        expect_op = '>='

        year_to_date = fy.first_date

    else:

        expect_op = '<'

        year_to_date = fy.next_fy_date

    if not isinstance(date_arg, datetime.date):

        date_arg = year_to_date(date_arg)

    assert query[cond_index:] == '({}) AND date {} {}'.format(

        ' OR '.join(query_kwargs['query']), expect_op, date_arg.isoformat(),

    )

@pytest.mark.parametrize('start_date,stop_date', itertools.product(

    [testutil.PAST_DATE, testutil.PAST_DATE.year],

    [testutil.FUTURE_DATE, testutil.FUTURE_DATE.year],

))

def test_build_query_two_date_args(fy, start_date, stop_date):

    args = query_args(['account ~ "^Equity:"'], start_date, stop_date, 'AND')

    query = qmod.build_query(args, fy)

    assert query.startswith('SELECT ')

    cond_index = query.index(' WHERE ') + 7

    if isinstance(start_date, int):

        start_date = fy.first_date(start_date)

    if isinstance(stop_date, int):

        stop_date = fy.next_fy_date(stop_date)

    assert query[cond_index:] == '({}) AND date >= {} AND date < {}'.format(

        args.query[0], start_date.isoformat(), stop_date.isoformat(),

    )

def test_build_query_plain_from_file(fy):

    with io.StringIO("SELECT *\n WHERE account ~ '^Assets:';\n") as qfile:

        query = qmod.build_query(query_args(), fy, qfile)

    assert re.fullmatch(r"SELECT \*\s+WHERE account ~ '\^Assets:';\s*", query)

def test_build_query_from_file_where_clauses(fy):

    conds = ["account ~ '^Income:'", "account ~ '^Expenses:'"]

    args = query_args(None, testutil.PAST_DATE, testutil.FUTURE_DATE, 'OR')

    with io.StringIO(''.join(f'{s}\n' for s in conds)) as qfile:

        query = qmod.build_query(args, fy, qfile)

    assert query.startswith('SELECT ')

    cond_index = query.index(' WHERE ') + 7

    assert query[cond_index:] == '({}) AND date >= {} AND date < {}'.format(

        ' OR '.join(conds),

        testutil.PAST_DATE.isoformat(),

        testutil.FUTURE_DATE.isoformat(),

    )

@pytest.mark.parametrize('arglist,fy', testutil.combine_values(

    [['--report-type', 'text'], ['--format=text'], ['-f', 'txt']],

    range(2018, 2021),

))

def test_text_query(arglist, fy):

    books_path = testutil.test_path(f'books/books/{fy}.beancount')

    config = testutil.TestConfig(books_path=books_path)

    arglist += ['select', 'date,', 'narration,', 'account,', 'position']

    returncode, stdout, stderr = pipe_main(arglist, config)

    assert returncode == 0

    stdout.seek(0)

    lines = iter(stdout)

    next(lines); next(lines)  # Skip header

    for count, line in enumerate(lines, 1):

        assert re.match(rf'^{fy}-\d\d-\d\d\s+{fy} donation\b', line)

    assert count >= 2

@pytest.mark.parametrize('arglist,fy', testutil.combine_values(

    [['--format=csv'], ['-f', 'csv'], ['-t', 'csv']],

    range(2018, 2021),

))

def test_csv_query(arglist, fy):

    books_path = testutil.test_path(f'books/books/{fy}.beancount')

    config = testutil.TestConfig(books_path=books_path)

    arglist += ['select', 'date,', 'narration,', 'account,', 'position']

    returncode, stdout, stderr = pipe_main(arglist, config)

    assert returncode == 0

    stdout.seek(0)

    for count, row in enumerate(csv.DictReader(stdout), 1):

        assert re.fullmatch(rf'{fy}-\d\d-\d\d', row['date'])

        assert row['narration'] == f'{fy} donation'

    assert count >= 2

@pytest.mark.parametrize('end_index', range(3))

def test_rewrite_query(end_index):

    books_path = testutil.test_path(f'books/books/2018.beancount')

    config = testutil.TestConfig(books_path=books_path)

    accounts = ['Assets', 'Income']

    expected = frozenset(accounts[:end_index])

    rewrite_paths = [

        testutil.test_path(f'userconfig/Rewrite{s}.yml')

        for s in expected

    ]

    arglist = [f'--rewrite-rules={path}' for path in rewrite_paths]

    arglist.append('--format=txt')

    arglist.append('select any_meta("root") as root')

    returncode, stdout, stderr = pipe_main(arglist, config)

    assert returncode == 0

    stdout.seek(0)

    actual = frozenset(line.rstrip('\n') for line in stdout)

    assert expected.issubset(actual)

    assert frozenset(accounts).difference(expected).isdisjoint(actual)