from datetime import datetime, timedelta

import pytest
import pytz
from freezegun import freeze_time

from app.aws.s3 import get_list_of_files_by_suffix, get_s3_file
from tests.app.conftest import datetime_in_past


def single_s3_object_stub(key='foo', last_modified=None):
    return {
        'ETag': '"d41d8cd98f00b204e9800998ecf8427e"',
        'Key': key,
        'LastModified': last_modified or datetime.utcnow(),
    }


def test_get_s3_file_makes_correct_call(notify_api, mocker):
    get_s3_mock = mocker.patch('app.aws.s3.get_s3_object')
    get_s3_file('foo-bucket', 'bar-file.txt')

    get_s3_mock.assert_called_with(
        'foo-bucket',
        'bar-file.txt'
    )


@freeze_time("2018-01-11 00:00:00")
@pytest.mark.parametrize('suffix_str, days_before, returned_no', [
    ('.ACK.txt', None, 1),
    ('.ack.txt', None, 1),
    ('.ACK.TXT', None, 1),
    ('', None, 2),
    ('', 1, 1),
])
def test_get_list_of_files_by_suffix(notify_api, mocker, suffix_str, days_before, returned_no):
    paginator_mock = mocker.patch('app.aws.s3.client')
    multiple_pages_s3_object = [
        {
            "Contents": [
                single_s3_object_stub('bar/foo.ACK.txt', datetime_in_past(1, 0)),
            ]
        },
        {
            "Contents": [
                single_s3_object_stub('bar/foo1.rs.txt', datetime_in_past(2, 0)),
            ]
        }
    ]
    paginator_mock.return_value.get_paginator.return_value.paginate.return_value = multiple_pages_s3_object
    if (days_before):
        key = get_list_of_files_by_suffix('foo-bucket', subfolder='bar', suffix=suffix_str,
                                          last_modified=datetime.now(tz=pytz.utc) - timedelta(days=days_before))
    else:
        key = get_list_of_files_by_suffix('foo-bucket', subfolder='bar', suffix=suffix_str)

    assert sum(1 for x in key) == returned_no
    for k in key:
        assert k == 'bar/foo.ACK.txt'


def test_get_list_of_files_by_suffix_empty_contents_return_with_no_error(notify_api, mocker):
    paginator_mock = mocker.patch('app.aws.s3.client')
    multiple_pages_s3_object = [
        {
            "other_content": [
                'some_values',
            ]
        }
    ]
    paginator_mock.return_value.get_paginator.return_value.paginate.return_value = multiple_pages_s3_object
    key = get_list_of_files_by_suffix('foo-bucket', subfolder='bar', suffix='.pdf')

    assert sum(1 for x in key) == 0