"""Nextcloud Provisioning API (OCS) Client."""
from typing import Optional
import requests
import urllib3


class NextcloudError(Exception):
    pass


class NextcloudClient:
    def __init__(self, host: str, *, admin_user: str, admin_password: str,
                 verify: bool = True, scheme: str = "https"):
        if not host:
            raise NextcloudError("Nextcloud-Host ist leer")
        self.base = f"{scheme}://{host}"
        self.session = requests.Session()
        self.session.verify = verify
        if not verify:
            urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
        self.session.auth = (admin_user, admin_password)
        self.session.headers["OCS-APIRequest"] = "true"
        self.session.headers["Accept"] = "application/json"

    def _meta(self, r: requests.Response, op: str) -> dict:
        if not r.ok and r.status_code not in (400, 401, 403, 404):
            raise NextcloudError(f"Nextcloud {op} HTTP {r.status_code}: {r.text[:300]}")
        try:
            data = r.json()
        except ValueError:
            raise NextcloudError(f"Nextcloud {op}: ungültige Antwort: {r.text[:300]}")
        return data.get("ocs", {})

    def user_exists(self, userid: str) -> bool:
        r = self.session.get(f"{self.base}/ocs/v2.php/cloud/users/{userid}")
        ocs = self._meta(r, "user-lookup")
        sc = ocs.get("meta", {}).get("statuscode")
        return sc in (100, 200)

    def ensure_group(self, group: str) -> None:
        if not group:
            return
        r = self.session.post(
            f"{self.base}/ocs/v2.php/cloud/groups",
            data={"groupid": group},
        )
        ocs = self._meta(r, "group-create")
        sc = ocs.get("meta", {}).get("statuscode")
        # 100/200 = ok, 102 = exists already
        if sc not in (100, 200, 102):
            raise NextcloudError(
                f"Nextcloud Gruppe '{group}': {sc} {ocs.get('meta', {}).get('message')}"
            )

    def create_user(self, *, userid: str, password: str,
                    email: Optional[str] = None,
                    display_name: Optional[str] = None,
                    group: Optional[str] = None,
                    quota_gb: Optional[int] = None) -> None:
        body = [("userid", userid), ("password", password)]
        if email:
            body.append(("email", email))
        if display_name:
            body.append(("displayName", display_name))
        if group:
            body.append(("groups[]", group))
        body.append(("quota", f"{quota_gb} GB" if quota_gb else "none"))

        r = self.session.post(
            f"{self.base}/ocs/v2.php/cloud/users",
            data=body,
        )
        ocs = self._meta(r, "user-create")
        sc = ocs.get("meta", {}).get("statuscode")
        if sc not in (100, 200):
            raise NextcloudError(
                f"Nextcloud user-create: {sc} {ocs.get('meta', {}).get('message')}"
            )