import json
import uuid
from collections import namedtuple
from datetime import datetime
from io import BytesIO
from unittest.mock import Mock, call

import pytest
from botocore.exceptions import ClientError as BotoClientError

from app import db
from app.clients.cbc_proxy import (
    CBCProxyClient,
    CBCProxyEE,
    CBCProxyO2,
    CBCProxyRetryableException,
    CBCProxyThree,
    CBCProxyVodafone,
)
from app.utils import DATETIME_FORMAT

EXAMPLE_AREAS = [{
    'description': 'london',
    'polygon': [
        [51.12, -1.2],
        [51.12, 1.2],
        [51.74, 1.2],
        [51.74, -1.2],
        [51.12, -1.2],
    ],
}]


@pytest.fixture(scope='function')
def cbc_proxy_client(client, mocker):
    client = CBCProxyClient()
    current_app = mocker.Mock(config={
        'CBC_PROXY_AWS_ACCESS_KEY_ID': 'cbc-proxy-aws-access-key-id',
        'CBC_PROXY_AWS_SECRET_ACCESS_KEY': 'cbc-proxy-aws-secret-access-key',
        'CBC_PROXY_ENABLED': True,
    })
    client.init_app(current_app)
    return client


@pytest.fixture
def cbc_proxy_ee(cbc_proxy_client):
    return cbc_proxy_client.get_proxy('ee')


@pytest.fixture
def cbc_proxy_vodafone(cbc_proxy_client):
    return cbc_proxy_client.get_proxy('vodafone')


@pytest.mark.parametrize('provider_name, expected_provider_class', [
    ('ee', CBCProxyEE),
    ('three', CBCProxyThree),
    ('o2', CBCProxyO2),
    ('vodafone', CBCProxyVodafone),
])
def test_cbc_proxy_client_returns_correct_client(provider_name, expected_provider_class):
    mock_lambda = Mock()
    cbc_proxy_client = CBCProxyClient()
    cbc_proxy_client._lambda_client = mock_lambda

    ret = cbc_proxy_client.get_proxy(provider_name)

    assert type(ret) == expected_provider_class
    assert ret._lambda_client == mock_lambda


def test_cbc_proxy_lambda_client_has_correct_region(cbc_proxy_ee):
    assert cbc_proxy_ee._lambda_client._client_config.region_name == 'eu-west-2'


def test_cbc_proxy_lambda_client_has_correct_keys(cbc_proxy_ee):
    key = cbc_proxy_ee._lambda_client._request_signer._credentials.access_key
    secret = cbc_proxy_ee._lambda_client._request_signer._credentials.secret_key

    assert key == 'cbc-proxy-aws-access-key-id'
    assert secret == 'cbc-proxy-aws-secret-access-key'


def test_cbc_proxy_send_link_test(mocker, cbc_proxy_ee):
    mock_send_link_test = mocker.patch.object(cbc_proxy_ee, '_send_link_test')
    cbc_proxy_ee.send_link_test()

    mock_send_link_test.assert_any_call(cbc_proxy_ee.lambda_name)
    mock_send_link_test.assert_any_call(cbc_proxy_ee.failover_lambda_name)


@pytest.mark.parametrize('description, expected_language', (
    ('my-description', 'en-GB'),
    ('mŷ-description', 'cy-GB'),
))
@pytest.mark.parametrize('cbc', ['ee', 'three', 'o2'])
def test_cbc_proxy_one_2_many_create_and_send_invokes_function(
    mocker,
    cbc_proxy_client,
    description,
    cbc,
    expected_language,
):
    cbc_proxy = cbc_proxy_client.get_proxy(cbc)

    identifier = 'my-identifier'
    headline = 'my-headline'

    sent = 'a-passed-through-sent-value'
    expires = 'a-passed-through-expires-value'

    ld_client_mock = mocker.patch.object(
        cbc_proxy,
        '_lambda_client',
        create=True,
    )

    ld_client_mock.invoke.return_value = {
        'StatusCode': 200,
    }

    cbc_proxy.create_and_send_broadcast(
        identifier=identifier,
        message_number='0000007b',
        headline=headline,
        description=description,
        areas=EXAMPLE_AREAS,
        sent=sent,
        expires=expires,
        channel="severe",
    )

    ld_client_mock.invoke.assert_called_once_with(
        FunctionName=f'{cbc}-1-proxy',
        InvocationType='RequestResponse',
        Payload=mocker.ANY,
    )

    kwargs = ld_client_mock.invoke.mock_calls[0][-1]
    payload_bytes = kwargs['Payload']
    payload = json.loads(payload_bytes)

    assert payload['identifier'] == identifier
    assert 'message_number' not in payload
    assert payload['message_format'] == 'cap'
    assert payload['message_type'] == 'alert'
    assert payload['headline'] == headline
    assert payload['description'] == description
    assert payload['areas'] == EXAMPLE_AREAS
    assert payload['sent'] == sent
    assert payload['expires'] == expires
    assert payload['language'] == expected_language
    assert payload['channel'] == 'severe'


@pytest.mark.parametrize('cbc', ['ee', 'three', 'o2'])
def test_cbc_proxy_one_2_many_cancel_invokes_function(mocker, cbc_proxy_client, cbc):
    cbc_proxy = cbc_proxy_client.get_proxy(cbc)

    identifier = 'my-identifier'
    MockProviderMessage = namedtuple(
        'BroadcastProviderMessage', ['id', 'message_number', 'created_at']
    )

    provider_messages = [
        MockProviderMessage(uuid.uuid4(), '0000007b', datetime(2020, 12, 16)),
        MockProviderMessage(uuid.uuid4(), '0000004e', datetime(2020, 12, 17))
    ]
    sent = '2020-12-17 14:19:44.130585'

    ld_client_mock = mocker.patch.object(
        cbc_proxy,
        '_lambda_client',
        create=True,
    )

    ld_client_mock.invoke.return_value = {
        'StatusCode': 200,
    }

    cbc_proxy.cancel_broadcast(
        identifier=identifier,
        message_number='00000050',
        previous_provider_messages=provider_messages,
        sent=sent
    )

    ld_client_mock.invoke.assert_called_once_with(
        FunctionName=f'{cbc}-1-proxy',
        InvocationType='RequestResponse',
        Payload=mocker.ANY,
    )

    kwargs = ld_client_mock.invoke.mock_calls[0][-1]
    payload_bytes = kwargs['Payload']
    payload = json.loads(payload_bytes)

    assert payload['identifier'] == identifier
    assert 'message_number' not in payload
    assert payload['message_format'] == 'cap'
    assert payload['message_type'] == 'cancel'
    assert payload['references'] == [
        {
            "message_id": str(provider_messages[0].id),
            "sent": provider_messages[0].created_at.strftime(DATETIME_FORMAT)
        },
        {
            "message_id": str(provider_messages[1].id),
            "sent": provider_messages[1].created_at.strftime(DATETIME_FORMAT)
        },
    ]
    assert payload['sent'] == sent


@pytest.mark.parametrize('description, expected_language', (
    ('my-description', 'English'),
    ('mŷ-description', 'Welsh'),
))
def test_cbc_proxy_vodafone_create_and_send_invokes_function(
    mocker,
    cbc_proxy_vodafone,
    description,
    expected_language,
):
    identifier = 'my-identifier'
    headline = 'my-headline'

    sent = 'a-passed-through-sent-value'
    expires = 'a-passed-through-expires-value'

    ld_client_mock = mocker.patch.object(
        cbc_proxy_vodafone,
        '_lambda_client',
        create=True,
    )

    ld_client_mock.invoke.return_value = {
        'StatusCode': 200,
    }

    cbc_proxy_vodafone.create_and_send_broadcast(
        identifier=identifier,
        message_number='0000007b',
        headline=headline,
        description=description,
        areas=EXAMPLE_AREAS,
        sent=sent,
        expires=expires,
        channel="test",
    )

    ld_client_mock.invoke.assert_called_once_with(
        FunctionName='vodafone-1-proxy',
        InvocationType='RequestResponse',
        Payload=mocker.ANY,
    )

    kwargs = ld_client_mock.invoke.mock_calls[0][-1]
    payload_bytes = kwargs['Payload']
    payload = json.loads(payload_bytes)

    assert payload['identifier'] == identifier
    assert payload['message_number'] == '0000007b'
    assert payload['message_format'] == 'ibag'
    assert payload['message_type'] == 'alert'
    assert payload['headline'] == headline
    assert payload['description'] == description
    assert payload['areas'] == EXAMPLE_AREAS
    assert payload['sent'] == sent
    assert payload['expires'] == expires
    assert payload['language'] == expected_language
    assert payload['channel'] == 'test'


def test_cbc_proxy_vodafone_cancel_invokes_function(mocker, cbc_proxy_vodafone):
    identifier = 'my-identifier'
    MockProviderMessage = namedtuple(
        'BroadcastProviderMessage',
        ['id', 'message_number', 'created_at']
    )

    provider_messages = [
        MockProviderMessage(uuid.uuid4(), 78, datetime(2020, 12, 16)),
        MockProviderMessage(uuid.uuid4(), 123, datetime(2020, 12, 17))
    ]
    sent = '2020-12-18 14:19:44.130585'

    ld_client_mock = mocker.patch.object(
        cbc_proxy_vodafone,
        '_lambda_client',
        create=True,
    )

    ld_client_mock.invoke.return_value = {
        'StatusCode': 200,
    }

    cbc_proxy_vodafone.cancel_broadcast(
        identifier=identifier,
        message_number='00000050',
        previous_provider_messages=provider_messages,
        sent=sent
    )

    ld_client_mock.invoke.assert_called_once_with(
        FunctionName='vodafone-1-proxy',
        InvocationType='RequestResponse',
        Payload=mocker.ANY,
    )

    kwargs = ld_client_mock.invoke.mock_calls[0][-1]
    payload_bytes = kwargs['Payload']
    payload = json.loads(payload_bytes)

    assert payload['identifier'] == identifier
    assert payload['message_number'] == '00000050'
    assert payload['message_format'] == 'ibag'
    assert payload['message_type'] == 'cancel'
    assert payload['references'] == [
        {
            "message_id": str(provider_messages[0].id),
            "message_number": '0000004e',
            "sent": provider_messages[0].created_at.strftime(DATETIME_FORMAT)
        },
        {
            "message_id": str(provider_messages[1].id),
            "message_number": '0000007b',
            "sent": provider_messages[1].created_at.strftime(DATETIME_FORMAT)
        },
    ]
    assert payload['sent'] == sent


@pytest.mark.parametrize('cbc', ['ee', 'vodafone', 'three', 'o2'])
def test_cbc_proxy_will_failover_to_second_lambda_if_boto_client_error(
    mocker,
    cbc_proxy_client,
    cbc
):
    cbc_proxy = cbc_proxy_client.get_proxy(cbc)

    ld_client_mock = mocker.patch.object(
        cbc_proxy,
        '_lambda_client',
        create=True,
    )

    ld_client_mock.invoke.side_effect = BotoClientError({}, 'error')

    with pytest.raises(CBCProxyRetryableException) as e:
        cbc_proxy.create_and_send_broadcast(
            identifier='my-identifier',
            message_number='0000007b',
            headline='my-headline',
            description='test-description',
            areas=EXAMPLE_AREAS,
            sent='a-passed-through-sent-value',
            expires='a-passed-through-expires-value',
            channel="severe",
        )

    assert e.match(f'Lambda failed for both {cbc}-1-proxy and {cbc}-2-proxy')

    assert ld_client_mock.invoke.call_args_list == [
        call(
            FunctionName=f'{cbc}-1-proxy',
            InvocationType='RequestResponse',
            Payload=mocker.ANY,
        ),
        call(
            FunctionName=f'{cbc}-2-proxy',
            InvocationType='RequestResponse',
            Payload=mocker.ANY,
        )
    ]


@pytest.mark.parametrize('cbc', ['ee', 'vodafone', 'three', 'o2'])
def test_cbc_proxy_will_failover_to_second_lambda_if_function_error(
    mocker,
    cbc_proxy_client,
    cbc
):
    cbc_proxy = cbc_proxy_client.get_proxy(cbc)

    ld_client_mock = mocker.patch.object(
        cbc_proxy,
        '_lambda_client',
        create=True,
    )

    ld_client_mock.invoke.side_effect = [
        {
            'StatusCode': 200,
            'FunctionError': 'Handled',
            'Payload': BytesIO(json.dumps({"errorMessage": "", "errorType": "CBCNewConnectionError"}).encode('utf-8')),
        },
        {
            'StatusCode': 200
        }
    ]

    cbc_proxy.create_and_send_broadcast(
        identifier='my-identifier',
        message_number='0000007b',
        headline='my-headline',
        description='test-description',
        areas=EXAMPLE_AREAS,
        sent='a-passed-through-sent-value',
        expires='a-passed-through-expires-value',
        channel="severe",
    )

    assert ld_client_mock.invoke.call_args_list == [
        call(
            FunctionName=f'{cbc}-1-proxy',
            InvocationType='RequestResponse',
            Payload=mocker.ANY,
        ),
        call(
            FunctionName=f'{cbc}-2-proxy',
            InvocationType='RequestResponse',
            Payload=mocker.ANY,
        )
    ]


@pytest.mark.parametrize('cbc', ['ee', 'vodafone', 'three', 'o2'])
def test_cbc_proxy_will_failover_to_second_lambda_if_invoke_error(
    mocker,
    cbc_proxy_client,
    cbc
):
    cbc_proxy = cbc_proxy_client.get_proxy(cbc)

    ld_client_mock = mocker.patch.object(
        cbc_proxy,
        '_lambda_client',
        create=True,
    )

    ld_client_mock.invoke.side_effect = [
        {
            'StatusCode': 400
        },
        {
            'StatusCode': 200
        }
    ]

    cbc_proxy.create_and_send_broadcast(
        identifier='my-identifier',
        message_number='0000007b',
        headline='my-headline',
        description='test-description',
        areas=EXAMPLE_AREAS,
        sent='a-passed-through-sent-value',
        expires='a-passed-through-expires-value',
        channel="test",
    )

    assert ld_client_mock.invoke.call_args_list == [
        call(
            FunctionName=f'{cbc}-1-proxy',
            InvocationType='RequestResponse',
            Payload=mocker.ANY,
        ),
        call(
            FunctionName=f'{cbc}-2-proxy',
            InvocationType='RequestResponse',
            Payload=mocker.ANY,
        )
    ]


@pytest.mark.parametrize('cbc', ['ee', 'vodafone', 'three', 'o2'])
def test_cbc_proxy_create_and_send_tries_failover_lambda_on_invoke_error_and_raises_if_both_invoke_error(
    mocker, cbc_proxy_client, cbc
):
    cbc_proxy = cbc_proxy_client.get_proxy(cbc)

    ld_client_mock = mocker.patch.object(
        cbc_proxy,
        '_lambda_client',
        create=True,
    )

    ld_client_mock.invoke.return_value = {
        'StatusCode': 400,
    }

    with pytest.raises(CBCProxyRetryableException) as e:
        cbc_proxy.create_and_send_broadcast(
            identifier='my-identifier',
            message_number='0000007b',
            headline='my-headline',
            description='my-description',
            areas=EXAMPLE_AREAS,
            sent='a-passed-through-sent-value',
            expires='a-passed-through-expires-value',
            channel="test",
        )

    assert e.match(f'Lambda failed for both {cbc}-1-proxy and {cbc}-2-proxy')

    assert ld_client_mock.invoke.call_args_list == [
        call(
            FunctionName=f'{cbc}-1-proxy',
            InvocationType='RequestResponse',
            Payload=mocker.ANY,
        ),
        call(
            FunctionName=f'{cbc}-2-proxy',
            InvocationType='RequestResponse',
            Payload=mocker.ANY,
        )
    ]


@pytest.mark.parametrize('cbc', ['ee', 'vodafone', 'three', 'o2'])
def test_cbc_proxy_create_and_send_tries_failover_lambda_on_function_error_and_raises_if_both_function_error(
    mocker, cbc_proxy_client, cbc
):
    cbc_proxy = cbc_proxy_client.get_proxy(cbc)

    ld_client_mock = mocker.patch.object(
        cbc_proxy,
        '_lambda_client',
        create=True,
    )

    ld_client_mock.invoke.return_value = {
        'StatusCode': 200,
        'FunctionError': 'something',
        'Payload': BytesIO(json.dumps({"errorMessage": "some message", "errorType": "SomeErrorType"}).encode('utf-8')),
    }

    with pytest.raises(CBCProxyRetryableException) as e:
        cbc_proxy.create_and_send_broadcast(
            identifier='my-identifier',
            message_number='0000007b',
            headline='my-headline',
            description='my-description',
            areas=EXAMPLE_AREAS,
            sent='a-passed-through-sent-value',
            expires='a-passed-through-expires-value',
            channel="severe",
        )

    assert e.match(f'Lambda failed for both {cbc}-1-proxy and {cbc}-2-proxy')

    assert ld_client_mock.invoke.call_args_list == [
        call(
            FunctionName=f'{cbc}-1-proxy',
            InvocationType='RequestResponse',
            Payload=mocker.ANY,
        ),
        call(
            FunctionName=f'{cbc}-2-proxy',
            InvocationType='RequestResponse',
            Payload=mocker.ANY,
        )
    ]


@pytest.mark.parametrize('cbc', ['ee', 'three', 'o2'])
def test_cbc_proxy_one_2_many_send_link_test_invokes_function(mocker, cbc_proxy_client, cbc):
    cbc_proxy = cbc_proxy_client.get_proxy(cbc)

    mocker.patch('app.clients.cbc_proxy.uuid.uuid4', return_value=123)

    ld_client_mock = mocker.patch.object(
        cbc_proxy,
        '_lambda_client',
        create=True,
    )

    ld_client_mock.invoke.return_value = {
        'StatusCode': 200,
    }

    cbc_proxy._send_link_test(
        lambda_name=f'{cbc}-1-proxy'
    )

    ld_client_mock.invoke.assert_called_once_with(
        FunctionName=f'{cbc}-1-proxy',
        InvocationType='RequestResponse',
        Payload=mocker.ANY,
    )

    kwargs = ld_client_mock.invoke.mock_calls[0][-1]
    payload_bytes = kwargs['Payload']
    payload = json.loads(payload_bytes)

    assert payload['identifier'] == '123'
    assert payload['message_type'] == 'test'
    assert 'message_number' not in payload
    assert payload['message_format'] == 'cap'


def test_cbc_proxy_vodafone_send_link_test_invokes_function(mocker, cbc_proxy_vodafone):
    mocker.patch('app.clients.cbc_proxy.uuid.uuid4', return_value=123)

    db.session.connection().execute(
        'ALTER SEQUENCE broadcast_provider_message_number_seq RESTART WITH 1'
    )

    ld_client_mock = mocker.patch.object(
        cbc_proxy_vodafone,
        '_lambda_client',
        create=True,
    )

    ld_client_mock.invoke.return_value = {
        'StatusCode': 200,
    }

    cbc_proxy_vodafone._send_link_test(
        lambda_name='vodafone-1-proxy'
    )

    ld_client_mock.invoke.assert_called_once_with(
        FunctionName='vodafone-1-proxy',
        InvocationType='RequestResponse',
        Payload=mocker.ANY,
    )

    kwargs = ld_client_mock.invoke.mock_calls[0][-1]
    payload_bytes = kwargs['Payload']
    payload = json.loads(payload_bytes)

    assert payload['identifier'] == '123'
    assert payload['message_type'] == 'test'
    assert payload['message_number'] == '00000001'
    assert payload['message_format'] == 'ibag'