from flask import request

from app.notify_client.events_api_client import events_api_client

EVENT_SCHEMAS = {
    "sucessful_login": {"user_id"},
    "update_user_email": {"user_id", "updated_by_id", "original_email_address", "new_email_address"},
    "update_user_mobile_number": {"user_id", "updated_by_id", "original_mobile_number", "new_mobile_number"},
    "remove_user_from_service": {"user_id", "removed_by_id", "service_id"},
    "add_user_to_service": {"user_id", "invited_by_id", "service_id", "ui_permissions"},
    "invite_user_to_service": {"email_address", "invited_by_id", "service_id", "ui_permissions"},
    "cancel_user_invite_to_service": {"email_address", "canceled_by_id", "service_id"},
    "set_user_permissions": {"user_id", "service_id", "original_ui_permissions", "new_ui_permissions", "set_by_id"},
    "archive_user": {"user_id", "archived_by_id"},
    "archive_service": {"service_id", "archived_by_id"},
    "suspend_service": {"service_id", "suspended_by_id"},
    "resume_service": {"service_id", "resumed_by_id"},
}


def on_user_logged_in(_sender, user):
    _send_event('sucessful_login', user_id=user.id)


def create_email_change_event(**kwargs):
    _send_event('update_user_email', **kwargs)


def create_mobile_number_change_event(**kwargs):
    _send_event('update_user_mobile_number', **kwargs)


def create_remove_user_from_service_event(**kwargs):
    _send_event('remove_user_from_service', **kwargs)


def create_invite_user_to_service_event(**kwargs):
    _send_event('invite_user_to_service', **kwargs)


def create_cancel_user_invite_to_service_event(**kwargs):
    _send_event('cancel_user_invite_to_service', **kwargs)


def create_add_user_to_service_event(**kwargs):
    _send_event('add_user_to_service', **kwargs)


def create_set_user_permissions_event(**kwargs):
    _send_event('set_user_permissions', **kwargs)


def create_archive_user_event(**kwargs):
    _send_event('archive_user', **kwargs)


def create_suspend_service_event(**kwargs):
    _send_event('suspend_service', **kwargs)


def create_archive_service_event(**kwargs):
    _send_event('archive_service', **kwargs)


def create_resume_service_event(**kwargs):
    _send_event('resume_service', **kwargs)


def _send_event(event_type, **kwargs):
    expected_keys = EVENT_SCHEMAS[event_type]
    actual_keys = set(kwargs.keys())

    if expected_keys != actual_keys:
        raise ValueError(f'Expected {expected_keys}, but got {actual_keys}')

    event_data = _construct_event_data(request)
    event_data.update(kwargs)

    events_api_client.create_event(event_type, event_data)


def _construct_event_data(request):
    return {'ip_address': _get_remote_addr(request),
            'browser_fingerprint': _get_browser_fingerprint(request)}


# This might not be totally correct depending on proxy setup
def _get_remote_addr(request):
    if request.headers.getlist("X-Forwarded-For"):
        return request.headers.getlist("X-Forwarded-For")[0]
    else:
        return request.remote_addr


def _get_browser_fingerprint(request):
    browser = request.user_agent.browser
    version = request.user_agent.version
    platform = request.user_agent.platform
    user_agent_string = request.user_agent.string
    # at some point this may be hashed?
    finger_print = {'browser': browser,
                    'platform': platform,
                    'version': version,
                    'user_agent_string': user_agent_string}

    return finger_print