# Copyright (c) Ansible Project
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import annotations

from io import StringIO
from itertools import count
from urllib.error import HTTPError

import pytest

from ansible_collections.community.general.plugins.module_utils._keycloak import (
    KeycloakError,
    get_token,
)

module_params_creds = {
    "auth_keycloak_url": "http://keycloak.url/auth",
    "validate_certs": True,
    "auth_realm": "master",
    "client_id": "admin-cli",
    "auth_username": "admin",
    "auth_password": "admin",
    "client_secret": None,
}


def build_mocked_request(get_id_user_count, response_dict):
    def _mocked_requests(*args, **kwargs):
        url = args[0]
        method = kwargs["method"]
        future_response = response_dict.get(url, None)
        return get_response(future_response, method, get_id_user_count)

    return _mocked_requests


def get_response(object_with_future_response, method, get_id_call_count):
    if callable(object_with_future_response):
        return object_with_future_response()
    if isinstance(object_with_future_response, dict):
        return get_response(object_with_future_response[method], method, get_id_call_count)
    if isinstance(object_with_future_response, list):
        try:
            call_number = get_id_call_count.__next__()
        except AttributeError:
            # manage python 2 versions.
            call_number = get_id_call_count.next()
        return get_response(object_with_future_response[call_number], method, get_id_call_count)
    return object_with_future_response


def create_wrapper(text_as_string):
    """Allow to mock many times a call to one address.
    Without this function, the StringIO is empty for the second call.
    """

    def _create_wrapper():
        return StringIO(text_as_string)

    return _create_wrapper


@pytest.fixture()
def mock_good_connection(mocker):
    token_response = {
        "http://keycloak.url/auth/realms/master/protocol/openid-connect/token": create_wrapper(
            '{"access_token": "alongtoken"}'
        ),
    }
    return mocker.patch(
        "ansible_collections.community.general.plugins.module_utils._keycloak.open_url",
        side_effect=build_mocked_request(count(), token_response),
        autospec=True,
    )


def test_connect_to_keycloak_with_creds(mock_good_connection):
    keycloak_header = get_token(module_params_creds)
    assert keycloak_header == {"Authorization": "Bearer alongtoken", "Content-Type": "application/json"}


def test_connect_to_keycloak_with_token(mock_good_connection):
    module_params_token = {
        "auth_keycloak_url": "http://keycloak.url/auth",
        "validate_certs": True,
        "client_id": "admin-cli",
        "token": "alongtoken",
    }
    keycloak_header = get_token(module_params_token)
    assert keycloak_header == {"Authorization": "Bearer alongtoken", "Content-Type": "application/json"}


@pytest.fixture()
def mock_bad_json_returned(mocker):
    token_response = {
        "http://keycloak.url/auth/realms/master/protocol/openid-connect/token": create_wrapper('{"access_token":'),
    }
    return mocker.patch(
        "ansible_collections.community.general.plugins.module_utils._keycloak.open_url",
        side_effect=build_mocked_request(count(), token_response),
        autospec=True,
    )


def test_bad_json_returned(mock_bad_json_returned):
    with pytest.raises(KeycloakError) as raised_error:
        get_token(module_params_creds)
    # cannot check all the message, different errors message for the value
    # error in python 2.6, 2.7 and 3.*.
    assert (
        "API returned invalid JSON when trying to obtain access token from "
        "http://keycloak.url/auth/realms/master/protocol/openid-connect/token: "
    ) in str(raised_error.value)


def raise_401(url):
    def _raise_401():
        raise HTTPError(url=url, code=401, msg="Unauthorized", hdrs="", fp=StringIO(""))

    return _raise_401


@pytest.fixture()
def mock_401_returned(mocker):
    token_response = {
        "http://keycloak.url/auth/realms/master/protocol/openid-connect/token": raise_401(
            "http://keycloak.url/auth/realms/master/protocol/openid-connect/token"
        ),
    }
    return mocker.patch(
        "ansible_collections.community.general.plugins.module_utils._keycloak.open_url",
        side_effect=build_mocked_request(count(), token_response),
        autospec=True,
    )


def test_error_returned(mock_401_returned):
    with pytest.raises(KeycloakError) as raised_error:
        get_token(module_params_creds)
    assert str(raised_error.value) == (
        "Could not obtain access token from http://keycloak.url"
        "/auth/realms/master/protocol/openid-connect/token: "
        "HTTP Error 401: Unauthorized"
    )


@pytest.fixture()
def mock_json_without_token_returned(mocker):
    token_response = {
        "http://keycloak.url/auth/realms/master/protocol/openid-connect/token": create_wrapper(
            '{"not_token": "It is not a token"}'
        ),
    }
    return mocker.patch(
        "ansible_collections.community.general.plugins.module_utils._keycloak.open_url",
        side_effect=build_mocked_request(count(), token_response),
        autospec=True,
    )


def test_json_without_token_returned(mock_json_without_token_returned):
    with pytest.raises(KeycloakError) as raised_error:
        get_token(module_params_creds)
    assert str(raised_error.value) == (
        "API did not include access_token field in response from "
        "http://keycloak.url/auth/realms/master/protocol/openid-connect/token"
    )