import configparser
import datetime
import decimal
import pathlib

import pytest
from import2ledger import errors, template

from . import DATA_DIR, normalize_whitespace

DATE = datetime.date(2015, 3, 14)

config = configparser.ConfigParser(comment_prefixes='#')
with pathlib.Path(DATA_DIR, 'templates.ini').open() as conffile:
    config.read_file(conffile)

def template_from(section_name, *args, **kwargs):
    return template.Template(config[section_name]['template'], *args, **kwargs)

def assert_easy_render(tmpl, entity, amount, currency, expect_date, expect_amt):
    rendered = tmpl.render(entity, decimal.Decimal(amount), currency, DATE)
    lines = [normalize_whitespace(s) for s in rendered.splitlines()]
    assert lines == [
        "",
        "{} {}".format(expect_date, entity),
        "  Accrued:Accounts Receivable  " + expect_amt,
        "  Income:Donations  " + expect_amt.replace(amount, "-" + amount),
    ]
    assert not tmpl.is_empty()

def test_easy_template():
    tmpl = template_from('Simplest')
    assert_easy_render(tmpl, 'JJ', '5.99', 'CAD', '2015/03/14', '5.99 CAD')

def test_date_formatting():
    tmpl = template_from('Simplest', date_fmt='%Y-%m-%d')
    assert_easy_render(tmpl, 'KK', '6.99', 'CAD', '2015-03-14', '6.99 CAD')

def test_currency_formatting():
    tmpl = template_from('Simplest', signed_currencies=['USD'])
    assert_easy_render(tmpl, 'CC', '7.99', 'USD', '2015/03/14', '$7.99')

def test_empty_template():
    tmpl = template.Template("\n \n")
    assert tmpl.render('BB', decimal.Decimal('8.99'), 'USD', DATE) == ''
    assert tmpl.is_empty()

def test_complex_template():
    template_vars = {
        'entity': 'T-T',
        'program': 'Spectrum Defense',
        'txid': 'ABCDEF',
    }
    tmpl = template_from('Complex', date_fmt='%Y-%m-%d', signed_currencies=['USD'])
    rendered = tmpl.render('TT', decimal.Decimal('125.50'), 'USD', DATE, **template_vars)
    lines = [normalize_whitespace(s) for s in rendered.splitlines()]
    assert lines == [
        "",
        "2015-03-14 TT",
        "  ;Tag: Value",
        "  ;TransactionID: ABCDEF",
        "  Accrued:Accounts Receivable  $125.50",
        "  ;Entity: Supplier",
        "  Income:Donations:Spectrum Defense  $-119.85",
        "  ;Program: Spectrum Defense",
        "  ;Entity: T-T",
        "  Income:Donations:General  $-5.65",
        "  ;Entity: T-T",
    ]

def test_balancing():
    tmpl = template_from('FiftyFifty')
    rendered = tmpl.render('FF', decimal.Decimal('1.01'), 'USD', DATE)
    lines = [normalize_whitespace(s) for s in rendered.splitlines()]
    assert lines == [
        "",
        "2015/03/14 FF",
        "  Accrued:Accounts Receivable  1.01 USD",
        "  Income:Donations  -0.50 USD",
        "  Income:Sales  -0.51 USD",
    ]

def test_multivalue():
    tmpl = template_from('Multivalue')
    rendered = tmpl.render('DD', decimal.Decimal('150.00'), 'USD', DATE,
                           tax=decimal.Decimal('12.50'))
    lines = [normalize_whitespace(s) for s in rendered.splitlines()]
    assert lines == [
        "",
        "2015/03/14 DD",
        "  Expenses:Taxes  12.50 USD",
        "  ;TaxAuthority: IRS",
        "  Accrued:Accounts Receivable  137.50 USD",
        "  Income:RBI  -15.00 USD",
        "  Income:Donations  -135.00 USD",
    ]

def test_zeroed_account_skipped():
    tmpl = template_from('Multivalue')
    rendered = tmpl.render('GG', decimal.Decimal('110.00'), 'USD', DATE,
                           tax=decimal.Decimal(0))
    lines = [normalize_whitespace(s) for s in rendered.splitlines()]
    assert lines == [
        "",
        "2015/03/14 GG",
        "  Accrued:Accounts Receivable  110.00 USD",
        "  Income:RBI  -11.00 USD",
        "  Income:Donations  -99.00 USD",
    ]

def test_custom_payee_line():
    tmpl = template_from('Custom Payee')
    rendered = tmpl.render('ZZ', decimal.Decimal('10.00'), 'USD', DATE,
                           custom_date=datetime.date(2014, 2, 13))
    lines = [normalize_whitespace(s) for s in rendered.splitlines()]
    assert lines == [
        "",
        "2014/02/13  ZZ - Custom",
        "  Accrued:Accounts Receivable  10.00 USD",
        "  Income:Donations  -10.00 USD",
    ]

def test_line1_not_custom_payee():
    tmpl = template_from('Simplest')
    rendered = tmpl.render('VV', decimal.Decimal('15.00'), 'USD', DATE,
                           custom_date=datetime.date(2014, 2, 12))
    lines = [normalize_whitespace(s) for s in rendered.splitlines()]
    assert lines == [
        "",
        "2015/03/14 VV",
        "  Accrued:Accounts Receivable  15.00 USD",
        "  Income:Donations  -15.00 USD",
    ]

@pytest.mark.parametrize('amount_expr', [
    '',
    'name',
    '-',
    '()',
    '+()',
    '{}',
    '{{}}',
    '{()}',
    '{name',
    'name}',
    '{42}',
    '(5).real',
    '{amount.real}',
    '{amount.is_nan()}',
    '{Decimal}',
    '{FOO}',
])
def test_bad_amount_expression(amount_expr):
    with pytest.raises(errors.UserInputError):
        template.Template(" Income  " + amount_expr)