"""Application.

The API application is a `flask` application. It provides simple features such
as registering a url for a specific handlers.
"""

from flask import Flask
from owsclient import OwsClient
from owslogger import flask_logger
from owsrequest import flask_request
from owsrequest.ows_client import correlation_id_getter, request_context_getter
from python_pdp_sdk.backends.authorization_backend import (
    AuthorizationBackend,
    PdpAuthorizationBackend,
)
from python_pdp_sdk.connectors.ows_pdp.ows_pdp import OwsPdpClient

from project_manager import config
from project_manager.constant import endpoint_const
from project_manager.util.json_encoder import CustomJSONEncoder


app = Flask(config.SERVICE_NAME)
app.json_encoder = CustomJSONEncoder
flask_logger.setup(
    app, config.ENVIRONMENT, config.LOGGER_NAME,
    config.LOGGER_LEVEL, config.SERVICE_NAME, config.SERVICE_VERSION,
    exclude_paths=[
        endpoint_const.HEALTH_CHECK,
        endpoint_const.DB_HEALTH_CHECK])

try:
    import uwsgi  # noqa
    uwsgiRunning = True
except ImportError:
    uwsgiRunning = False

flask_request.setup(
    app, config.ENVIRONMENT,
    uwsgi_cache_enabled=uwsgiRunning,
    add_request_context=True)


def setup_ows_client() -> OwsClient:
    """Create and return a configured OwsClient instance."""
    return OwsClient(
        environment=config.ENVIRONMENT,
        service_name=config.SERVICE_NAME,
        correlation_id_getter=correlation_id_getter,
        request_context_getter=request_context_getter,
    )


def setup_authorization_backend(ows_client: OwsClient) -> AuthorizationBackend:
    """Create and return a PDP-backed AuthorizationBackend instance."""
    return PdpAuthorizationBackend(OwsPdpClient(ows_client))


ows_client: OwsClient = setup_ows_client()
authorization_backend: AuthorizationBackend = setup_authorization_backend(ows_client)