import json
from datetime import datetime

import pytest
from flask import url_for
from freezegun import freeze_time
from itsdangerous import SignatureExpired
from notifications_utils.url_safe_token import generate_token

from tests.conftest import SERVICE_ONE_ID, url_for_endpoint_with_token


@freeze_time("2021-01-01 11:11:11")
def test_should_render_new_password_template(
    mocker,
    notify_admin,
    client,
    mock_send_verify_code,
    mock_get_user_by_email_request_password_reset,
):
    user = mock_get_user_by_email_request_password_reset.return_value
    user['password_changed_at'] = '2021-01-01 00:00:00'
    mock_update_user_attribute = mocker.patch(
        'app.user_api_client.update_user_attribute',
        return_value=user,
    )
    data = json.dumps({'email': user['email_address'], 'created_at': str(datetime.utcnow())})
    token = generate_token(data, notify_admin.config['SECRET_KEY'],
                           notify_admin.config['DANGEROUS_SALT'])

    response = client.get(url_for_endpoint_with_token('.new_password', token=token))
    assert response.status_code == 200
    assert 'You can now create a new password for your account.' in response.get_data(as_text=True)

    mock_update_user_attribute.assert_called_once_with(
        user['id'],
        email_access_validated_at='2021-01-01T11:11:11'
    )


def test_should_return_404_when_email_address_does_not_exist(
    notify_admin,
    client,
    mock_get_user_by_email_not_found,
):
    data = json.dumps({'email': 'no_user@d.gov.uk', 'created_at': str(datetime.utcnow())})
    token = generate_token(data, notify_admin.config['SECRET_KEY'], notify_admin.config['DANGEROUS_SALT'])
    response = client.get(url_for_endpoint_with_token('.new_password', token=token))
    assert response.status_code == 404


@pytest.mark.parametrize('redirect_url', [
    None,
    f'/services/{SERVICE_ONE_ID}/templates',
])
def test_should_redirect_to_two_factor_when_password_reset_is_successful(
    notify_admin,
    client,
    mock_get_user_by_email_request_password_reset,
    mock_login,
    mock_send_verify_code,
    mock_reset_failed_login_count,
    redirect_url
):
    user = mock_get_user_by_email_request_password_reset.return_value
    data = json.dumps({'email': user['email_address'], 'created_at': str(datetime.utcnow())})
    token = generate_token(data, notify_admin.config['SECRET_KEY'], notify_admin.config['DANGEROUS_SALT'])
    response = client.post(url_for_endpoint_with_token('.new_password', token=token, next=redirect_url),
                           data={'new_password': 'a-new_password'})
    assert response.status_code == 302
    assert response.location == url_for('.two_factor_sms', _external=True, next=redirect_url)
    mock_get_user_by_email_request_password_reset.assert_called_once_with(user['email_address'])


@pytest.mark.parametrize('redirect_url', [
    None,
    f'/services/{SERVICE_ONE_ID}/templates',
])
def test_should_redirect_to_two_factor_webauthn_when_password_reset_is_successful(
    notify_admin,
    client,
    mock_get_user_by_email_request_password_reset,
    mock_send_verify_code,
    mock_reset_failed_login_count,
    redirect_url
):
    user = mock_get_user_by_email_request_password_reset.return_value
    user['auth_type'] = 'webauthn_auth'
    data = json.dumps({'email': user['email_address'], 'created_at': str(datetime.utcnow())})
    token = generate_token(data, notify_admin.config['SECRET_KEY'], notify_admin.config['DANGEROUS_SALT'])
    response = client.post(url_for_endpoint_with_token('.new_password', token=token, next=redirect_url),
                           data={'new_password': 'a-new_password'})
    assert response.status_code == 302
    assert response.location == url_for('.two_factor_webauthn', _external=True, next=redirect_url)
    mock_get_user_by_email_request_password_reset.assert_called_once_with(user['email_address'])

    assert not mock_send_verify_code.called
    assert mock_reset_failed_login_count.called


def test_should_redirect_index_if_user_has_already_changed_password(
    notify_admin,
    client,
    mock_get_user_by_email_user_changed_password,
    mock_login,
    mock_send_verify_code,
    mock_reset_failed_login_count
):
    user = mock_get_user_by_email_user_changed_password.return_value
    data = json.dumps({'email': user['email_address'], 'created_at': str(datetime.utcnow())})
    token = generate_token(data, notify_admin.config['SECRET_KEY'], notify_admin.config['DANGEROUS_SALT'])
    response = client.post(url_for_endpoint_with_token('.new_password', token=token),
                           data={'new_password': 'a-new_password'})
    assert response.status_code == 302
    assert response.location == url_for('.index', _external=True)
    mock_get_user_by_email_user_changed_password.assert_called_once_with(user['email_address'])


def test_should_redirect_to_forgot_password_with_flash_message_when_token_is_expired(
    notify_admin,
    client,
    mock_login,
    mocker
):
    mocker.patch('app.main.views.new_password.check_token', side_effect=SignatureExpired('expired'))
    token = generate_token('foo@bar.com', notify_admin.config['SECRET_KEY'], notify_admin.config['DANGEROUS_SALT'])

    response = client.get(url_for_endpoint_with_token('.new_password', token=token))

    assert response.status_code == 302
    assert response.location == url_for('.forgot_password', _external=True)


def test_should_sign_in_when_password_reset_is_successful_for_email_auth(
    notify_admin,
    client,
    mock_get_user,
    mock_get_user_by_email_request_password_reset,
    mock_login,
    mock_send_verify_code,
    mock_reset_failed_login_count,
    mock_update_user_password
):
    user = mock_get_user_by_email_request_password_reset.return_value
    user['auth_type'] = 'email_auth'
    data = json.dumps({'email': user['email_address'], 'created_at': str(datetime.utcnow())})
    token = generate_token(data, notify_admin.config['SECRET_KEY'], notify_admin.config['DANGEROUS_SALT'])

    response = client.post(url_for_endpoint_with_token('.new_password', token=token),
                           data={'new_password': 'a-new_password'})

    assert response.status_code == 302
    assert response.location == url_for('.show_accounts_or_dashboard', _external=True)
    assert mock_get_user_by_email_request_password_reset.called
    assert mock_reset_failed_login_count.called

    # the log-in flow makes a couple of calls
    mock_get_user.assert_called_once_with(user['id'])
    mock_update_user_password.assert_called_once_with(user['id'], 'a-new_password')

    assert not mock_send_verify_code.called