from urllib.parse import urljoin

import requests
from django.conf import settings

from apps.reports.services.oauth import OAuth2ClientCredentials


class ReportDataSources:
    """
    Keep downstream calls for report generation in one place.

    The concrete service endpoints are intentionally placeholders until the
    exact internal service URLs and response shapes are known.
    """

    def __init__(self, oauth_client=None):
        self.oauth_client = oauth_client or OAuth2ClientCredentials()

    def fetch_users(self, filters):
        return []

    def fetch_user_metrics(self, user_ids, filters):
        return {}

    def fetch_tickets(self, filters):
        return []

    def fetch_ticket_metrics(self, ticket_ids, filters):
        return {}

    def get_json(self, base_url, path, params=None):
        url = urljoin(f"{base_url.rstrip('/')}/", path.lstrip("/"))
        response = requests.get(
            url,
            params=params,
            headers=self.oauth_client.authorization_header(),
            timeout=settings.SERVICE_REQUEST_TIMEOUT,
        )
        response.raise_for_status()
        return response.json()