from datetime import datetime
from functools import partial

import pytest
from flask import url_for
from freezegun import freeze_time

from app.formatters import (
    email_safe,
    format_datetime_relative,
    format_delta,
    format_notification_status_as_url,
    format_number_in_pounds_as_currency,
    round_to_significant_figures,
)


@pytest.mark.parametrize('status, notification_type, expected', (
    # Successful statuses aren’t linked
    ('created', 'email', lambda: None),
    ('sending', 'email', lambda: None),
    ('delivered', 'email', lambda: None),
    # Failures are linked to the channel-specific page
    ('temporary-failure', 'email', partial(url_for, 'main.message_status', _anchor='email-statuses')),
    ('permanent-failure', 'email', partial(url_for, 'main.message_status', _anchor='email-statuses')),
    ('technical-failure', 'email', partial(url_for, 'main.message_status', _anchor='email-statuses')),
    ('temporary-failure', 'sms', partial(url_for, 'main.message_status', _anchor='text-message-statuses')),
    ('permanent-failure', 'sms', partial(url_for, 'main.message_status', _anchor='text-message-statuses')),
    ('technical-failure', 'sms', partial(url_for, 'main.message_status', _anchor='text-message-statuses')),
))
def test_format_notification_status_as_url(
    client_request,
    status,
    notification_type,
    expected,
):
    assert format_notification_status_as_url(
        status, notification_type
    ) == expected()


@pytest.mark.parametrize('input_number, formatted_number', [
    (0, '0p'),
    (0.01, '1p'),
    (0.5, '50p'),
    (1, '£1.00'),
    (1.01, '£1.01'),
    (1.006, '£1.01'),
    (5.25, '£5.25'),
    (5.7, '£5.70'),
    (381, '£381.00'),
    (144820, '£144,820.00'),
])
def test_format_number_in_pounds_as_currency(input_number, formatted_number):
    assert format_number_in_pounds_as_currency(input_number) == formatted_number


@pytest.mark.parametrize('time, human_readable_datetime', [
    # incoming in UTC, outgoing in "human formatted" UTC
    ('2018-03-14 09:00', '14 March at 09:00'),
    ('2018-03-14 19:00', '14 March at 19:00'),

    ('2018-03-15 09:00', '15 March at 09:00'),
    ('2018-03-15 19:00', '15 March at 19:00'),

    ('2018-03-19 09:00', '19 March at 09:00'),
    ('2018-03-19 19:00', '19 March at 19:00'),
    ('2018-03-19 23:59', '19 March at 23:59'),

    ('2018-03-20 00:00', '19 March at 00:00'),  # we specifically refer to 00:00 as belonging to the day before.
    ('2018-03-20 04:01', 'yesterday at 04:01'),
    ('2018-03-20 09:00', 'yesterday at 09:00'),
    ('2018-03-20 19:00', 'yesterday at 19:00'),
    ('2018-03-20 23:59', 'yesterday at 23:59'),

    ('2018-03-21 00:00', 'yesterday at 00:00'),  # we specifically refer to 00:00 as belonging to the day before.
    ('2018-03-21 04:01', 'today at 04:01'),
    ('2018-03-21 09:00', 'today at 09:00'),
    ('2018-03-21 12:00', 'today at 12:00'),
    ('2018-03-21 19:00', 'today at 19:00'),
    ('2018-03-21 23:59', 'today at 23:59'),

    ('2018-03-22 00:00', 'today at 00:00'),
    ('2018-03-22 04:01', 'tomorrow at 04:01'),
    ('2018-03-22 09:00', 'tomorrow at 09:00'),
    ('2018-03-22 19:00', 'tomorrow at 19:00'),
    ('2018-03-22 23:59', 'tomorrow at 23:59'),

    ('2018-03-23 04:01', '23 March at 04:01'),
    ('2018-03-23 09:00', '23 March at 09:00'),
    ('2018-03-23 19:00', '23 March at 19:00'),

])
def test_format_datetime_relative(time, human_readable_datetime):
    with freeze_time('2018-03-21 12:00'):
        assert format_datetime_relative(time) == human_readable_datetime


@pytest.mark.parametrize('value, significant_figures, expected_result', (
    (0, 1, 0),
    (0, 2, 0),
    (12_345, 1, 10_000),
    (12_345, 2, 12_000),
    (12_345, 3, 12_300),
    (12_345, 9, 12_345),
    (12_345.6789, 1, 10_000),
    (12_345.6789, 9, 12_345),
    (-12_345, 1, -10_000),
))
def test_round_to_significant_figures(value, significant_figures, expected_result):
    assert round_to_significant_figures(value, significant_figures) == expected_result


@pytest.mark.parametrize('service_name, safe_email', [
    ('name with spaces', 'name.with.spaces'),
    ('singleword', 'singleword'),
    ('UPPER CASE', 'upper.case'),
    ('Service - with dash', 'service.with.dash'),
    ('lots      of spaces', 'lots.of.spaces'),
    ('name.with.dots', 'name.with.dots'),
    ('name-with-other-delimiters', 'namewithotherdelimiters'),
    ('.leading', 'leading'),
    ('trailing.', 'trailing'),
    ('üńïçödë wördś', 'unicode.words'),
])
def test_email_safe_return_dot_separated_email_domain(service_name, safe_email):
    assert email_safe(service_name) == safe_email


def test_format_delta():
    naive_now_utc = datetime.utcnow().isoformat()
    assert format_delta(naive_now_utc) == "just now"