from unittest.mock import ANY, Mock

import pytest
from botocore.exceptions import ClientError
from flask import make_response, url_for
from requests import RequestException

from app.s3_client.s3_letter_upload_client import LetterMetadata
from app.utils import normalize_spaces
from tests.conftest import SERVICE_ONE_ID


def test_get_upload_letter(client_request):
    page = client_request.get('main.upload_letter', service_id=SERVICE_ONE_ID)

    assert page.find('h1').text == 'Upload a letter'
    assert page.find('input', class_='file-upload-field')
    assert page.select('main button[type=submit]')
    assert normalize_spaces(page.find('label', class_='file-upload-button').text) == 'Choose file'


@pytest.mark.parametrize('extra_permissions, expected_allow_international', (
    ([], False),
    (['international_letters'], True),
))
def test_post_upload_letter_redirects_for_valid_file(
    mocker,
    active_user_with_permissions,
    service_one,
    client_request,
    fake_uuid,
    extra_permissions,
    expected_allow_international,
):
    mocker.patch('uuid.uuid4', return_value=fake_uuid)
    antivirus_mock = mocker.patch('app.main.views.uploads.antivirus_client.scan', return_value=True)
    mock_sanitise = mocker.patch(
        'app.main.views.uploads.sanitise_letter',
        return_value=Mock(
            content='The sanitised content',
            json=lambda: {'file': 'VGhlIHNhbml0aXNlZCBjb250ZW50', 'recipient_address': 'The Queen'}
        )
    )
    mock_s3 = mocker.patch('app.main.views.uploads.upload_letter_to_s3')
    mocker.patch('app.main.views.uploads.get_letter_metadata', return_value=LetterMetadata({
        'filename': 'tests/test_pdf_files/one_page_pdf.pdf',
        'page_count': '1',
        'status': 'valid',
        'recipient': 'The Queen'
    }))
    mocker.patch('app.main.views.uploads.service_api_client.get_precompiled_template')

    service_one['restricted'] = False
    service_one['permissions'] += extra_permissions
    client_request.login(active_user_with_permissions, service=service_one)

    with open('tests/test_pdf_files/one_page_pdf.pdf', 'rb') as file:
        page = client_request.post(
            'main.upload_letter',
            service_id=SERVICE_ONE_ID,
            _data={'file': file},
            _follow_redirects=True,
        )
    assert antivirus_mock.called

    mock_s3.assert_called_once_with(
        b'The sanitised content',
        file_location='service-{}/{}.pdf'.format(SERVICE_ONE_ID, fake_uuid),
        status='valid',
        page_count=1,
        filename='tests/test_pdf_files/one_page_pdf.pdf',
        recipient='The Queen',
    )
    mock_sanitise.assert_called_once_with(
        ANY,
        allow_international_letters=expected_allow_international,
    )

    assert 'The Queen' in page.find('div', class_='js-stick-at-bottom-when-scrolling').text
    assert page.find('h1').text == 'tests/test_pdf_files/one_page_pdf.pdf'
    assert not page.find(id='validation-error-message')

    assert not page.find('input', {'name': 'file_id'})
    assert normalize_spaces(page.select('main button[type=submit]')[0].text) == 'Send 1 letter'


def test_post_upload_letter_shows_letter_preview_for_valid_file(
    mocker,
    active_user_with_permissions,
    service_one,
    client_request,
    fake_uuid,
):
    letter_template = {'template_type': 'letter',
                       'reply_to_text': '',
                       'postage': 'second',
                       'subject': 'hi',
                       'content': 'my letter'}

    mocker.patch('uuid.uuid4', return_value=fake_uuid)
    mocker.patch('app.main.views.uploads.antivirus_client.scan', return_value=True)
    mocker.patch(
        'app.main.views.uploads.sanitise_letter',
        return_value=Mock(
            content='The sanitised content',
            json=lambda: {'file': 'VGhlIHNhbml0aXNlZCBjb250ZW50', 'recipient_address': 'The Queen'}
        )
    )
    mocker.patch('app.main.views.uploads.upload_letter_to_s3')
    mocker.patch('app.main.views.uploads.pdf_page_count', return_value=3)
    mocker.patch('app.main.views.uploads.get_letter_metadata', return_value=LetterMetadata({
        'filename': 'tests/test_pdf_files/one_page_pdf.pdf',
        'page_count': '3',
        'status': 'valid',
        'recipient': 'The Queen'
    }))
    mocker.patch('app.main.views.uploads.service_api_client.get_precompiled_template', return_value=letter_template)

    service_one['restricted'] = False
    client_request.login(active_user_with_permissions, service=service_one)

    with open('tests/test_pdf_files/one_page_pdf.pdf', 'rb') as file:
        page = client_request.post(
            'main.upload_letter',
            service_id=SERVICE_ONE_ID,
            _data={'file': file},
            _follow_redirects=True,
        )

    assert page.find('h1').text == 'tests/test_pdf_files/one_page_pdf.pdf'
    assert len(page.select('.letter-postage')) == 0
    # Check postage radios exists and second class is checked by default
    assert page.find('input', id="postage-0", value="first")
    assert page.find('input', id="postage-1", value="second").has_attr('checked')

    letter_images = page.select('main img')
    assert len(letter_images) == 3

    for page_no, img in enumerate(letter_images, start=1):
        assert img['src'] == url_for(
            '.view_letter_upload_as_preview',
            service_id=SERVICE_ONE_ID,
            file_id=fake_uuid,
            page=page_no)


def test_upload_international_letter_shows_preview_with_no_choice_of_postage(
    mocker,
    active_user_with_permissions,
    service_one,
    client_request,
    fake_uuid,
):
    letter_template = {
        'template_type': 'letter',
        'reply_to_text': '',
        'postage': 'second',
        'subject': 'hi',
        'content': 'my letter',
    }

    mocker.patch('uuid.uuid4', return_value=fake_uuid)
    mocker.patch('app.main.views.uploads.antivirus_client.scan', return_value=True)
    mocker.patch('app.main.views.uploads.sanitise_letter', return_value=Mock(
        content='The sanitised content',
        json=lambda: {'file': 'VGhlIHNhbml0aXNlZCBjb250ZW50', 'recipient_address': 'The Queen'}
    ))
    mocker.patch('app.main.views.uploads.upload_letter_to_s3')
    mocker.patch('app.main.views.uploads.pdf_page_count', return_value=3)
    mocker.patch('app.main.views.uploads.get_letter_metadata', return_value=LetterMetadata({
        'filename': 'tests/test_pdf_files/one_page_pdf.pdf',
        'page_count': '3',
        'status': 'valid',
        'recipient': (
            '123 Example Street\n'
            'Andorra la Vella\n'
            'Andorra'
        ),
    }))
    mocker.patch('app.main.views.uploads.service_api_client.get_precompiled_template', return_value=letter_template)

    service_one['restricted'] = False
    client_request.login(active_user_with_permissions, service=service_one)

    with open('tests/test_pdf_files/one_page_pdf.pdf', 'rb') as file:
        page = client_request.post(
            'main.upload_letter',
            service_id=SERVICE_ONE_ID,
            _data={'file': file},
            _follow_redirects=True,
        )

    assert page.find('h1').text == 'tests/test_pdf_files/one_page_pdf.pdf'
    assert not page.select('.letter-postage')
    assert not page.select('input[type=radio]')
    assert normalize_spaces(
        page.select_one('.js-stick-at-bottom-when-scrolling').text
    ) == (
        'Recipient: 123 Example Street, Andorra la Vella, Andorra '
        'Postage: international '
        'Send 1 letter'
    )


def test_post_upload_letter_shows_error_when_file_is_not_a_pdf(client_request):
    with open('tests/non_spreadsheet_files/actually_a_png.csv', 'rb') as file:
        page = client_request.post(
            'main.upload_letter',
            service_id=SERVICE_ONE_ID,
            _data={'file': file},
            _expected_status=200
        )
    assert page.find('h1').text == 'Wrong file type'
    assert page.find('div', class_='banner-dangerous').find('p').text == 'Save your letter as a PDF and try again.'
    assert normalize_spaces(page.find('label', class_='file-upload-button').text) == 'Upload your file again'


def test_post_upload_letter_shows_error_when_no_file_uploaded(client_request):
    page = client_request.post(
        'main.upload_letter',
        service_id=SERVICE_ONE_ID,
        _data={'file': ''},
        _expected_status=200
    )
    assert page.find('div', class_='banner-dangerous').find('h1').text == 'You need to choose a file to upload'
    assert normalize_spaces(page.find('label', class_='file-upload-button').text) == 'Upload your file again'


def test_post_upload_letter_shows_error_when_file_contains_virus(mocker, client_request):
    mocker.patch('app.main.views.uploads.antivirus_client.scan', return_value=False)

    with open('tests/test_pdf_files/one_page_pdf.pdf', 'rb') as file:
        page = client_request.post(
            'main.upload_letter',
            service_id=SERVICE_ONE_ID,
            _data={'file': file},
            _expected_status=400
        )
    assert page.find('div', class_='banner-dangerous').find('h1').text == 'Your file contains a virus'
    assert normalize_spaces(page.find('label', class_='file-upload-button').text) == 'Upload your file again'


def test_post_choose_upload_file_when_file_is_too_big(mocker, client_request):
    mocker.patch('app.main.views.uploads.antivirus_client.scan', return_value=True)

    with open('tests/test_pdf_files/big.pdf', 'rb') as file:
        page = client_request.post(
            'main.upload_letter',
            service_id=SERVICE_ONE_ID,
            _data={'file': file},
            _expected_status=400
        )
    assert page.find('div', class_='banner-dangerous').find('h1').text == 'Your file is too big'
    assert page.find('div', class_='banner-dangerous').find('p').text == 'Files must be smaller than 2MB.'
    assert normalize_spaces(page.find('label', class_='file-upload-button').text) == 'Upload your file again'


def test_post_choose_upload_file_when_file_is_malformed(mocker, client_request):
    mocker.patch('app.main.views.uploads.antivirus_client.scan', return_value=True)

    with open('tests/test_pdf_files/no_eof_marker.pdf', 'rb') as file:
        page = client_request.post(
            'main.upload_letter',
            service_id=SERVICE_ONE_ID,
            _data={'file': file},
            _expected_status=400
        )
    assert page.find('div', class_='banner-dangerous').find('h1').text == "There’s a problem with your file"
    assert page.find(
        'div', class_='banner-dangerous'
    ).find('p').text == 'Notify cannot read this PDF.Save a new copy of your file and try again.'
    assert normalize_spaces(page.find('label', class_='file-upload-button').text) == 'Upload your file again'


def test_post_upload_letter_with_invalid_file(mocker, client_request, fake_uuid):
    mocker.patch('uuid.uuid4', return_value=fake_uuid)
    mocker.patch('app.main.views.uploads.antivirus_client.scan', return_value=True)
    mock_s3 = mocker.patch('app.main.views.uploads.upload_letter_to_s3')

    mock_sanitise_response = Mock()
    mock_sanitise_response.raise_for_status.side_effect = RequestException(response=Mock(status_code=400))
    mock_sanitise_response.json = lambda: {
        "message": "content-outside-printable-area",
        "invalid_pages": [1]
    }
    mocker.patch('app.main.views.uploads.sanitise_letter', return_value=mock_sanitise_response)
    mocker.patch('app.main.views.uploads.service_api_client.get_precompiled_template')
    mocker.patch('app.main.views.uploads.get_letter_metadata', return_value=LetterMetadata({
        'filename': 'tests/test_pdf_files/one_page_pdf.pdf', 'page_count': '1', 'status': 'invalid',
        'message': 'content-outside-printable-area', 'invalid_pages': '[1]'}))

    with open('tests/test_pdf_files/one_page_pdf.pdf', 'rb') as file:
        file_contents = file.read()
        file.seek(0)

        page = client_request.post(
            'main.upload_letter',
            service_id=SERVICE_ONE_ID,
            _data={'file': file},
            _follow_redirects=True
        )

        mock_s3.assert_called_once_with(
            file_contents,
            file_location='service-{}/{}.pdf'.format(SERVICE_ONE_ID, fake_uuid),
            status='invalid',
            page_count=1,
            filename='tests/test_pdf_files/one_page_pdf.pdf',
            invalid_pages=[1],
            message='content-outside-printable-area'
        )

    assert page.find('div', class_='banner-dangerous').find('h1', {"data-error-type": 'content-outside-printable-area'})
    assert not page.find('button', {'class': 'page-footer__button', 'type': 'submit'})


def test_post_upload_letter_shows_letter_preview_for_invalid_file(mocker, client_request, fake_uuid):
    letter_template = {'template_type': 'letter',
                       'reply_to_text': '',
                       'postage': 'first',
                       'subject': 'hi',
                       'content': 'my letter'}

    mocker.patch('uuid.uuid4', return_value=fake_uuid)
    mocker.patch('app.main.views.uploads.antivirus_client.scan', return_value=True)
    mocker.patch('app.main.views.uploads.upload_letter_to_s3')
    mock_sanitise_response = Mock()
    mock_sanitise_response.raise_for_status.side_effect = RequestException(response=Mock(status_code=400))
    mock_sanitise_response.json = lambda: {"message": "template preview error", "recipient_address": "The Queen"}
    mocker.patch('app.main.views.uploads.sanitise_letter', return_value=mock_sanitise_response)
    mocker.patch('app.main.views.uploads.service_api_client.get_precompiled_template', return_value=letter_template)
    mocker.patch('app.main.views.uploads.get_letter_metadata', return_value=LetterMetadata({
        'filename': 'tests/test_pdf_files/one_page_pdf.pdf', 'page_count': '1', 'status': 'invalid',
        'message': 'template-preview-error'}))

    with open('tests/test_pdf_files/one_page_pdf.pdf', 'rb') as file:
        page = client_request.post(
            'main.upload_letter',
            service_id=SERVICE_ONE_ID,
            _data={'file': file},
            _follow_redirects=True,
        )

    assert 'The Queen' not in page.text
    assert len(page.select('.letter-postage')) == 0

    assert page.find("a", {"class": "govuk-back-link"})["href"] == "/services/{}/upload-letter".format(SERVICE_ONE_ID)
    assert page.find("label", {"class": "file-upload-button"})

    letter_images = page.select('main img')
    assert len(letter_images) == 1
    assert letter_images[0]['src'] == url_for(
        '.view_letter_upload_as_preview',
        service_id=SERVICE_ONE_ID,
        file_id=fake_uuid,
        page=1
    )


def test_post_upload_letter_does_not_upload_to_s3_if_template_preview_raises_unknown_error(
    mocker,
    client_request,
    fake_uuid,
):
    mocker.patch('uuid.uuid4', return_value=fake_uuid)
    mocker.patch('app.main.views.uploads.antivirus_client.scan', return_value=True)
    mock_s3 = mocker.patch('app.main.views.uploads.upload_letter_to_s3')

    mocker.patch('app.main.views.uploads.sanitise_letter', side_effect=RequestException())

    with pytest.raises(RequestException):
        with open('tests/test_pdf_files/one_page_pdf.pdf', 'rb') as file:
            client_request.post(
                'main.upload_letter',
                service_id=SERVICE_ONE_ID,
                _data={'file': file},
                _follow_redirects=True
            )

    assert not mock_s3.called


def test_uploaded_letter_preview(
    mocker,
    active_user_with_permissions,
    service_one,
    client_request,
    fake_uuid,
):
    mocker.patch('app.main.views.uploads.service_api_client')
    mocker.patch('app.main.views.uploads.get_letter_metadata', return_value=LetterMetadata({
        'filename': 'my_encoded_filename%C2%A3.pdf',
        'page_count': '1',
        'status': 'valid',
        'recipient': 'Bugs Bunny%0A123 Big Hole%0DLooney Town'  # 'Bugs Bunny%0A123 Big Hole\rLooney Town' url encoded
    }))

    service_one['restricted'] = False
    client_request.login(active_user_with_permissions, service=service_one)

    page = client_request.get(
        'main.uploaded_letter_preview',
        service_id=SERVICE_ONE_ID,
        file_id=fake_uuid,
    )

    assert page.find('h1').text == 'my_encoded_filename£.pdf'
    assert page.find('div', class_='letter-sent')
    assert not page.find("label", {"class": "file-upload-button"})
    assert page.find('button', {'class': 'page-footer__button', 'type': 'submit'})


def test_uploaded_letter_preview_does_not_show_send_button_if_service_in_trial_mode(
    mocker,
    client_request,
    fake_uuid,
):
    mocker.patch('app.main.views.uploads.service_api_client')
    mocker.patch('app.main.views.uploads.get_letter_metadata', return_value=LetterMetadata({
        'filename': 'my_letter.pdf', 'page_count': '1', 'status': 'valid', 'recipient': 'The Queen'}))

    # client_request uses service_one, which is in trial mode
    page = client_request.get(
        'main.uploaded_letter_preview',
        service_id=SERVICE_ONE_ID,
        file_id=fake_uuid,
        original_filename='my_letter.pdf',
        page_count=1,
        status='valid',
        error={},
        _test_page_title=False,
    )

    assert normalize_spaces(page.find('h1').text) == 'You cannot send this letter'
    assert page.find('div', class_='letter-sent')
    assert normalize_spaces(
        page.select_one('.js-stick-at-bottom-when-scrolling p').text
    ) == (
        'Recipient: The Queen'
    )
    assert not page.find('form')
    assert len(page.select('main button[type=submit]')) == 0


def test_uploaded_letter_preview_redirects_if_file_not_in_s3(
    mocker,
    client_request,
    fake_uuid
):
    boto_error_json = {'Error': {'Code': 'NoSuchKey', 'Message': 'The specified key does not exist.'}}
    mocker.patch(
        'app.main.views.uploads.get_letter_metadata',
        side_effect=ClientError(boto_error_json, 'operation_name')
    )
    client_request.get(
        'main.uploaded_letter_preview',
        service_id=SERVICE_ONE_ID,
        file_id=fake_uuid,
        _expected_status=302,
        _expected_redirect=url_for(
            'main.view_notification',
            service_id=SERVICE_ONE_ID,
            notification_id=fake_uuid,
            _external=True
        )
    )


@pytest.mark.parametrize('invalid_pages, page_requested, overlay_expected', (
    ('[1, 2]', 1, True),
    ('[1, 2]', 2, True),
    ('[1, 2]', 3, False),
    ('[]', 1, False),
))
def test_uploaded_letter_preview_image_shows_overlay_when_content_outside_printable_area_on_a_page(
    mocker,
    logged_in_client,
    mock_get_service,
    fake_uuid,
    invalid_pages,
    page_requested,
    overlay_expected,
):
    mocker.patch(
        'app.main.views.uploads.get_letter_pdf_and_metadata',
        return_value=('pdf_file', {
            'message': 'content-outside-printable-area',
            'invalid_pages': invalid_pages,
        })
    )
    template_preview_mock_valid = mocker.patch(
        'app.main.views.uploads.TemplatePreview.from_valid_pdf_file',
        return_value=make_response('page.html', 200)
    )
    template_preview_mock_invalid = mocker.patch(
        'app.main.views.uploads.TemplatePreview.from_invalid_pdf_file',
        return_value=make_response('page.html', 200)
    )

    logged_in_client.get(
        url_for(
            'main.view_letter_upload_as_preview',
            file_id=fake_uuid,
            service_id=SERVICE_ONE_ID,
            page=page_requested,
        )
    )

    if overlay_expected:
        template_preview_mock_invalid.assert_called_once_with('pdf_file', page_requested)
        assert template_preview_mock_valid.called is False
    else:
        template_preview_mock_valid.assert_called_once_with('pdf_file', page_requested)
        assert template_preview_mock_invalid.called is False


@pytest.mark.parametrize(
    'metadata', [
        {'message': 'letter-not-a4-portrait-oriented'},
        {'message': 'letter-too-long'},
        {},
    ]
)
def test_uploaded_letter_preview_image_does_not_show_overlay_if_no_content_outside_printable_area(
    mocker,
    logged_in_client,
    mock_get_service,
    metadata,
    fake_uuid,
):
    mocker.patch(
        'app.main.views.uploads.get_letter_pdf_and_metadata',
        return_value=('pdf_file', metadata)
    )
    template_preview_mock = mocker.patch(
        'app.main.views.uploads.TemplatePreview.from_valid_pdf_file',
        return_value=make_response('page.html', 200))

    logged_in_client.get(
        url_for('main.view_letter_upload_as_preview', file_id=fake_uuid, service_id=SERVICE_ONE_ID, page=1)
    )

    template_preview_mock.assert_called_once_with('pdf_file', 1)


def test_uploaded_letter_preview_image_400s_for_bad_page_type(
    client_request,
    fake_uuid,
):
    client_request.get(
        'main.view_letter_upload_as_preview',
        file_id=fake_uuid,
        service_id=SERVICE_ONE_ID,
        page='foo',
        _test_page_title=False,
        _expected_status=400,
    )


@pytest.mark.parametrize('address, post_data, expected_postage', (
    (
        'address',
        {'filename': 'my_file.pdf', 'postage': 'first'},
        'first',
    ),
    (
        'address',
        {'filename': 'my_file.pdf'},
        'second',
    ),
    (
        '123 Example Street\nLiechtenstein',
        {'filename': 'my_file.pdf', 'postage': 'first'},
        'europe',
    ),
    (
        '123 Example Street\nLiechtenstein',
        {'filename': 'my_file.pdf'},
        'europe',
    ),
    (
        '123 Example Street\nLesotho',
        {'filename': 'my_file.pdf'},
        'rest-of-world',
    ),
))
def test_send_uploaded_letter_sends_letter_and_redirects_to_notification_page(
    mocker,
    service_one,
    client_request,
    fake_uuid,
    address,
    post_data,
    expected_postage,
):
    metadata = LetterMetadata({
        'filename': 'my_file.pdf',
        'page_count': '1',
        'status': 'valid',
        'recipient': address,
    })

    mocker.patch('app.main.views.uploads.get_letter_pdf_and_metadata', return_value=('file', metadata))
    mock_send = mocker.patch('app.main.views.uploads.notification_api_client.send_precompiled_letter')
    mocker.patch('app.main.views.uploads.get_letter_metadata', return_value=metadata)

    service_one['permissions'] = ['letter', 'upload_letters']

    client_request.post(
        'main.send_uploaded_letter',
        service_id=SERVICE_ONE_ID,
        file_id=fake_uuid,
        _data=post_data,
        _expected_redirect=url_for(
            'main.view_notification',
            service_id=SERVICE_ONE_ID,
            notification_id=fake_uuid,
            _external=True
        )
    )
    mock_send.assert_called_once_with(
        SERVICE_ONE_ID,
        'my_file.pdf',
        fake_uuid,
        expected_postage,
        address,
    )


@pytest.mark.parametrize('permissions', [
    ['email'],
    ['letter'],
    ['upload_letters'],
])
def test_send_uploaded_letter_when_service_does_not_have_correct_permissions(
    mocker,
    service_one,
    client_request,
    permissions,
    fake_uuid,
):
    mocker.patch('app.main.views.uploads.get_letter_pdf_and_metadata', return_value=('file', {'status': 'valid'}))
    mock_send = mocker.patch('app.main.views.uploads.notification_api_client.send_precompiled_letter')

    service_one['permissions'] = permissions

    client_request.post(
        'main.send_uploaded_letter',
        service_id=SERVICE_ONE_ID,
        file_id=fake_uuid,
        _data={'filename': 'my_file.pdf', 'postage': 'first'},
        _expected_status=403
    )
    assert not mock_send.called


def test_send_uploaded_letter_when_metadata_states_pdf_is_invalid(
    mocker, service_one, client_request, fake_uuid,
):
    mock_send = mocker.patch('app.main.views.uploads.notification_api_client.send_precompiled_letter')
    mocker.patch(
        'app.main.views.uploads.get_letter_metadata',
        return_value=LetterMetadata(
            {
                'filename': 'my_file.pdf', 'page_count': '3', 'status': 'invalid',
                'message': 'error', 'invalid_pages': '[1]'
            }
        )
    )

    service_one['permissions'] = ['letter', 'upload_letters']

    client_request.post(
        'main.send_uploaded_letter',
        service_id=SERVICE_ONE_ID,
        file_id=fake_uuid,
        _data={'filename': 'my_file.pdf'},
        _expected_status=403
    )
    assert not mock_send.called