from django.conf import settings
from django.http import HttpRequest
from ninja import Router, Schema
from ninja.errors import HttpError

from accounts.auth import AUTH
from accounts.models import PushSubscription
from tracker.push import notify_user, push_is_configured

router = Router(auth=AUTH)


class SubscriptionKeys(Schema):
    p256dh: str
    auth: str


class SubscribeIn(Schema):
    """Exactly the shape of a browser PushSubscription, so the client can post it as-is."""

    endpoint: str
    keys: SubscriptionKeys


class UnsubscribeIn(Schema):
    endpoint: str


@router.post("/subscribe")
def subscribe(request: HttpRequest, payload: SubscribeIn):
    """Register this device for reminders. Re-subscribing the same endpoint is a no-op."""
    if not push_is_configured():
        raise HttpError(503, "Push is not configured on the server.")

    PushSubscription.objects.update_or_create(
        endpoint=payload.endpoint,
        defaults={
            "user": request.user,
            "p256dh": payload.keys.p256dh,
            "auth": payload.keys.auth,
            "user_agent": request.headers.get("User-Agent", "")[:300],
        },
    )
    return {"detail": "Reminders enabled on this device."}


@router.post("/unsubscribe")
def unsubscribe(request: HttpRequest, payload: UnsubscribeIn):
    PushSubscription.objects.filter(
        user=request.user, endpoint=payload.endpoint
    ).delete()
    return {"detail": "Reminders disabled on this device."}


@router.post("/test")
def send_test(request: HttpRequest):
    """Push a notification right now, to prove the chain works end to end."""
    if not request.user.push_subscriptions.exists():
        raise HttpError(400, "No device has enabled reminders yet.")

    delivered = notify_user(
        request.user,
        {
            "title": "Osiris — test",
            "body": "Reminders are working. This is what a dose reminder looks like.",
            "url": "/admin/today/",
            "tag": "test",
        },
    )
    if not delivered:
        raise HttpError(502, "The push service rejected the message.")

    return {"detail": f"Sent to {delivered} device(s)."}


@router.get("/public-key", auth=None)
def public_key(request: HttpRequest):
    """The applicationServerKey the browser needs in order to subscribe."""
    return {"public_key": settings.VAPID_PUBLIC_KEY}