from typing import Dict, Any, Optional, Iterable
from io import StringIO

import json
import os

from zerver.lib import mdiff
from zerver.lib.openapi import validate_against_openapi_schema

if False:
    from zulip import Client

ZULIP_DIR = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
FIXTURE_PATH = os.path.join(ZULIP_DIR, 'templates', 'zerver', 'api', 'fixtures.json')

def load_api_fixtures():
    # type: () -> Dict[str, Any]
    with open(FIXTURE_PATH, 'r') as fp:
        json_dict = json.loads(fp.read())
        return json_dict

FIXTURES = load_api_fixtures()

def add_subscriptions(client):
    # type: (Client) -> None

    # {code_example|start}
    # Subscribe to the stream "new stream"
    result = client.add_subscriptions(
        streams=[
            {
                'name': 'new stream',
                'description': 'New stream for testing'
            }
        ]
    )
    # {code_example|end}

    fixture = FIXTURES['add-subscriptions']['without_principals']
    test_against_fixture(result, fixture)

    # {code_example|start}
    # To subscribe another user to a stream, you may pass in
    # the `principals` argument, like so:
    result = client.add_subscriptions(
        streams=[
            {'name': 'new stream', 'description': 'New stream for testing'}
        ],
        principals=['newbie@zulip.com']
    )
    # {code_example|end}
    assert result['result'] == 'success'
    assert 'newbie@zulip.com' in result['subscribed']

def test_add_subscriptions_already_subscribed(client):
    # type: (Client) -> None
    result = client.add_subscriptions(
        streams=[
            {'name': 'new stream', 'description': 'New stream for testing'}
        ],
        principals=['newbie@zulip.com']
    )

    fixture = FIXTURES['add-subscriptions']['already_subscribed']
    test_against_fixture(result, fixture)

def test_authorization_errors_fatal(client, nonadmin_client):
    # type: (Client, Client) -> None
    client.add_subscriptions(
        streams=[
            {'name': 'private_stream'}
        ],
    )

    stream_id = client.get_stream_id('private_stream')['stream_id']
    client.call_endpoint(
        'streams/{}'.format(stream_id),
        method='PATCH',
        request={'is_private': True}
    )

    result = nonadmin_client.add_subscriptions(
        streams=[
            {'name': 'private_stream'}
        ],
        authorization_errors_fatal=False,
    )

    fixture = FIXTURES['add-subscriptions']['unauthorized_errors_fatal_false']
    test_against_fixture(result, fixture)

    result = nonadmin_client.add_subscriptions(
        streams=[
            {'name': 'private_stream'}
        ],
        authorization_errors_fatal=True,
    )

    fixture = FIXTURES['add-subscriptions']['unauthorized_errors_fatal_true']
    test_against_fixture(result, fixture)

def create_user(client):
    # type: (Client) -> None

    # {code_example|start}
    # Create a user
    request = {
        'email': 'newbie@zulip.com',
        'password': 'temp',
        'full_name': 'New User',
        'short_name': 'newbie'
    }
    result = client.create_user(request)
    # {code_example|end}

    fixture = FIXTURES['successful-response-empty']
    test_against_fixture(result, fixture)

    # Test "Email already used error"
    result = client.create_user(request)

    fixture = FIXTURES['email_already_used_error']
    test_against_fixture(result, fixture)

def get_members(client):
    # type: (Client) -> None

    # {code_example|start}
    # Get all users in the realm
    result = client.get_members()
    # {code_example|end}

    fixture = FIXTURES['get-all-users']
    test_against_fixture(result, fixture, check_if_equal=['msg', 'result'],
                         check_if_exists=['members'])
    members = [m for m in result['members'] if m['email'] == 'newbie@zulip.com']
    assert len(members) == 1
    newbie = members[0]
    assert not newbie['is_admin']
    assert newbie['full_name'] == 'New User'

    member_fixture = fixture['members'][0]
    member_result = result['members'][0]
    test_against_fixture(member_result, member_fixture,
                         check_if_exists=member_fixture.keys())

    # {code_example|start}
    # You may pass the `client_gravatar` query parameter as follows:
    result = client.call_endpoint(
        url='users?client_gravatar=true',
        method='GET',
    )
    # {code_example|end}

    test_against_fixture(result, fixture, check_if_equal=['msg', 'result'],
                         check_if_exists=['members'])
    assert result['members'][0]['avatar_url'] is None

def get_profile(client):
    # type: (Client) -> None

    # {code_example|start}
    # Get the profile of the user/bot that requests this endpoint,
    # which is `client` in this case:
    result = client.get_profile()
    # {code_example|end}

    fixture = FIXTURES['get-profile']
    check_if_equal = ['email', 'full_name', 'msg', 'result', 'short_name']
    check_if_exists = ['client_id', 'is_admin', 'is_bot', 'max_message_id',
                       'pointer', 'user_id']
    test_against_fixture(result, fixture, check_if_equal=check_if_equal,
                         check_if_exists=check_if_exists)

def get_stream_id(client):
    # type: (Client) -> None

    # {code_example|start}
    # Get the ID of a given stream
    stream_name = 'new stream'
    result = client.get_stream_id(stream_name)
    # {code_example|end}

    fixture = FIXTURES['get-stream-id']
    test_against_fixture(result, fixture, check_if_equal=['msg', 'result'],
                         check_if_exists=['stream_id'])

def get_streams(client):
    # type: (Client) -> None

    # {code_example|start}
    # Get all streams that the user has access to
    result = client.get_streams()
    # {code_example|end}

    fixture = FIXTURES['get-all-streams']
    test_against_fixture(result, fixture, check_if_equal=['msg', 'result'],
                         check_if_exists=['streams'])
    assert len(result['streams']) == len(fixture['streams'])
    streams = [s for s in result['streams'] if s['name'] == 'new stream']
    assert streams[0]['description'] == 'New stream for testing'

    # {code_example|start}
    # You may pass in one or more of the query parameters mentioned above
    # as keyword arguments, like so:
    result = client.get_streams(include_public=False)
    # {code_example|end}

    test_against_fixture(result, fixture, check_if_equal=['msg', 'result'],
                         check_if_exists=['streams'])
    assert len(result['streams']) == 4

def test_user_not_authorized_error(nonadmin_client):
    # type: (Client) -> None
    result = nonadmin_client.get_streams(include_all_active=True)

    fixture = FIXTURES['user-not-authorized-error']
    test_against_fixture(result, fixture)

def get_subscribers(client):
    # type: (Client) -> None

    result = client.get_subscribers(stream='new stream')
    assert result['subscribers'] == ['iago@zulip.com', 'newbie@zulip.com']

def get_user_agent(client):
    # type: (Client) -> None

    result = client.get_user_agent()
    assert result.startswith('ZulipPython/')

def list_subscriptions(client):
    # type: (Client) -> None
    # {code_example|start}
    # Get all streams that the user is subscribed to
    result = client.list_subscriptions()
    # {code_example|end}

    fixture = FIXTURES['get-subscribed-streams']
    test_against_fixture(result, fixture, check_if_equal=['msg', 'result'],
                         check_if_exists=['subscriptions'])

    streams = [s for s in result['subscriptions'] if s['name'] == 'new stream']
    assert streams[0]['description'] == 'New stream for testing'

def remove_subscriptions(client):
    # type: (Client) -> None

    # {code_example|start}
    # Unsubscribe from the stream "new stream"
    result = client.remove_subscriptions(
        ['new stream']
    )
    # {code_example|end}

    fixture = FIXTURES['remove-subscriptions']
    test_against_fixture(result, fixture)

    # test it was actually removed
    result = client.list_subscriptions()
    assert result['result'] == 'success'
    streams = [s for s in result['subscriptions'] if s['name'] == 'new stream']
    assert len(streams) == 0

    # {code_example|start}
    # Unsubscribe another user from the stream "new stream"
    result = client.remove_subscriptions(
        ['new stream'],
        principals=['newbie@zulip.com']
    )
    # {code_example|end}

    test_against_fixture(result, fixture)

def render_message(client):
    # type: (Client) -> None

    # {code_example|start}
    # Render a message
    request = {
        'content': '**foo**'
    }
    result = client.render_message(request)
    # {code_example|end}

    fixture = FIXTURES['render-message']
    test_against_fixture(result, fixture)

def stream_message(client):
    # type: (Client) -> int

    # {code_example|start}
    # Send a stream message
    request = {
        "type": "stream",
        "to": "Denmark",
        "subject": "Castle",
        "content": "Something is rotten in the state of Denmark."
    }
    result = client.send_message(request)
    # {code_example|end}

    fixture = FIXTURES['stream-message']
    test_against_fixture(result, fixture, check_if_equal=['result'],
                         check_if_exists=['id'])

    # test it was actually sent
    message_id = result['id']
    url = 'messages/' + str(message_id)
    result = client.call_endpoint(
        url=url,
        method='GET'
    )
    assert result['result'] == 'success'
    assert result['raw_content'] == request['content']

    return message_id

def test_nonexistent_stream_error(client):
    # type: (Client) -> None
    request = {
        "type": "stream",
        "to": "nonexistent_stream",
        "subject": "Castle",
        "content": "Something is rotten in the state of Denmark."
    }
    result = client.send_message(request)

    fixture = FIXTURES['nonexistent-stream-error']
    test_against_fixture(result, fixture)

def private_message(client):
    # type: (Client) -> None

    # {code_example|start}
    # Send a private message
    request = {
        "type": "private",
        "to": "iago@zulip.com",
        "content": "I come not, friends, to steal away your hearts."
    }
    result = client.send_message(request)
    # {code_example|end}

    fixture = FIXTURES['private-message']
    test_against_fixture(result, fixture, check_if_equal=['result'],
                         check_if_exists=['id'])

    # test it was actually sent
    message_id = result['id']
    url = 'messages/' + str(message_id)
    result = client.call_endpoint(
        url=url,
        method='GET'
    )
    assert result['result'] == 'success'
    assert result['raw_content'] == request['content']

def test_private_message_invalid_recipient(client):
    # type: (Client) -> None
    request = {
        "type": "private",
        "to": "eeshan@zulip.com",
        "content": "I come not, friends, to steal away your hearts."
    }
    result = client.send_message(request)

    fixture = FIXTURES['invalid-pm-recipient-error']
    test_against_fixture(result, fixture)

def update_message(client, message_id):
    # type: (Client, int) -> None

    assert int(message_id)

    # {code_example|start}
    # Edit a message
    # (make sure that message_id below is set to the ID of the
    # message you wish to update)
    request = {
        "message_id": message_id,
        "content": "New content"
    }
    result = client.update_message(request)
    # {code_example|end}

    validate_against_openapi_schema(result, '/messages/{message_id}', 'patch')

    # test it was actually updated
    url = 'messages/' + str(message_id)
    result = client.call_endpoint(
        url=url,
        method='GET'
    )
    assert result['result'] == 'success'
    assert result['raw_content'] == request['content']

def test_update_message_edit_permission_error(client, nonadmin_client):
    # type: (Client, Client) -> None
    request = {
        "type": "stream",
        "to": "Denmark",
        "subject": "Castle",
        "content": "Something is rotten in the state of Denmark."
    }
    result = client.send_message(request)

    request = {
        "message_id": result["id"],
        "content": "New content"
    }
    result = nonadmin_client.update_message(request)

    fixture = FIXTURES['update-message-edit-permission-error']
    test_against_fixture(result, fixture)

def register_queue(client):
    # type: (Client) -> str

    # {code_example|start}
    # Register the queue
    result = client.register(
        event_types=['messages', 'realm_emoji']
    )
    # {code_example|end}

    fixture = FIXTURES['register-queue']
    test_against_fixture(result, fixture, check_if_equal=['msg', 'result'],
                         check_if_exists=['last_event_id', 'queue_id'])

    return result['queue_id']

def deregister_queue(client, queue_id):
    # type: (Client, str) -> None

    # {code_example|start}
    # Delete a queue (queue_id is the ID of the queue
    # to be removed)
    result = client.deregister(queue_id)
    # {code_example|end}

    fixture = FIXTURES['successful-response-empty']
    test_against_fixture(result, fixture)

    # Test "BAD_EVENT_QUEUE_ID" error
    result = client.deregister(queue_id)
    fixture = FIXTURES['bad_event_queue_id_error']
    test_against_fixture(result, fixture, check_if_equal=['code', 'result'],
                         check_if_exists=['queue_id', 'msg'])

def upload_file(client):
    # type: (Client) -> None
    fp = StringIO("zulip")
    fp.name = "zulip.txt"

    # {code_example|start}
    # Upload a file
    # (Make sure that 'fp' is a file object)
    result = client.call_endpoint(
        'user_uploads',
        method='POST',
        files=[fp]
    )
    # {code_example|end}

    fixture = FIXTURES['upload-file']
    test_against_fixture(result, fixture, check_if_equal=['msg', 'result'],
                         check_if_exists=['uri'])

def get_stream_topics(client, stream_id):
    # type: (Client, int) -> None

    # {code_example|start}
    result = client.get_stream_topics(stream_id)
    # {code_example|end}

    validate_against_openapi_schema(result, '/users/me/{stream_id}/topics', 'get')

def test_invalid_api_key(client_with_invalid_key):
    # type: (Client) -> None
    result = client_with_invalid_key.list_subscriptions()
    fixture = FIXTURES['invalid-api-key']
    test_against_fixture(result, fixture)

def test_missing_request_argument(client):
    # type: (Client) -> None
    result = client.render_message({})

    fixture = FIXTURES['missing-request-argument-error']
    test_against_fixture(result, fixture)

def test_invalid_stream_error(client):
    # type: (Client) -> None
    result = client.get_stream_id('nonexistent')

    fixture = FIXTURES['invalid-stream-error']
    test_against_fixture(result, fixture)

TEST_FUNCTIONS = {
    'render-message': render_message,
    'stream-message': stream_message,
    'private-message': private_message,
    '/messages/{message_id}:patch': update_message,
    'get-stream-id': get_stream_id,
    'get-subscribed-streams': list_subscriptions,
    'get-all-streams': get_streams,
    'create-user': create_user,
    'get-profile': get_profile,
    'add-subscriptions': add_subscriptions,
    'remove-subscriptions': remove_subscriptions,
    'get-all-users': get_members,
    'register-queue': register_queue,
    'delete-queue': deregister_queue,
    'upload-file': upload_file,
    '/users/me/{stream_id}/topics:get': get_stream_topics
}

# SETUP METHODS FOLLOW

def test_against_fixture(result, fixture, check_if_equal=[], check_if_exists=[]):
    # type: (Dict[str, Any], Dict[str, Any], Optional[Iterable[str]], Optional[Iterable[str]]) -> None
    assertLength(result, fixture)

    if not check_if_equal and not check_if_exists:
        for key, value in fixture.items():
            assertEqual(key, result, fixture)

    if check_if_equal:
        for key in check_if_equal:
            assertEqual(key, result, fixture)

    if check_if_exists:
        for key in check_if_exists:
            assertIn(key, result)

def assertEqual(key, result, fixture):
    # type: (str, Dict[str, Any], Dict[str, Any]) -> None
    if result[key] != fixture[key]:
        first = "{key} = {value}".format(key=key, value=result[key])
        second = "{key} = {value}".format(key=key, value=fixture[key])
        raise AssertionError("Actual and expected outputs do not match; showing diff:\n" +
                             mdiff.diff_strings(first, second))
    else:
        assert result[key] == fixture[key]

def assertLength(result, fixture):
    # type: (Dict[str, Any], Dict[str, Any]) -> None
    if len(result) != len(fixture):
        result_string = json.dumps(result, indent=4, sort_keys=True)
        fixture_string = json.dumps(fixture, indent=4, sort_keys=True)
        raise AssertionError("The lengths of the actual and expected outputs do not match; showing diff:\n" +
                             mdiff.diff_strings(result_string, fixture_string))
    else:
        assert len(result) == len(fixture)

def assertIn(key, result):
    # type: (str, Dict[str, Any]) -> None
    if key not in result.keys():
        raise AssertionError(
            "The actual output does not contain the the key `{key}`.".format(key=key)
        )
    else:
        assert key in result

def test_messages(client):
    # type: (Client) -> None

    render_message(client)
    message_id = stream_message(client)
    update_message(client, message_id)
    private_message(client)

    test_nonexistent_stream_error(client)
    test_private_message_invalid_recipient(client)

def test_users(client):
    # type: (Client) -> None

    create_user(client)
    get_members(client)
    get_profile(client)
    upload_file(client)

def test_streams(client):
    # type: (Client) -> None

    add_subscriptions(client)
    test_add_subscriptions_already_subscribed(client)
    list_subscriptions(client)
    get_stream_id(client)
    get_streams(client)
    get_subscribers(client)
    remove_subscriptions(client)
    get_stream_topics(client, 1)

def test_queues(client):
    # type: (Client) -> None
    # Note that the example for api/get-events-from-queue is not tested.
    # Since, methods such as client.get_events() or client.call_on_each_message
    # are blocking calls and since the event queue backend is already
    # thoroughly tested in zerver/tests/test_event_queue.py, it is not worth
    # the effort to come up with asynchronous logic for testing those here.
    queue_id = register_queue(client)
    deregister_queue(client, queue_id)

def test_errors(client):
    # type: (Client) -> None
    test_missing_request_argument(client)
    test_invalid_stream_error(client)

def test_the_api(client):
    # type: (Client) -> None

    get_user_agent(client)
    test_users(client)
    test_streams(client)
    test_messages(client)
    test_queues(client)
    test_errors(client)