"""Scan-to-connect: the data and the QR a phone's camera opens."""
from __future__ import annotations

import io

from fastapi import APIRouter, Depends, Request
from fastapi.responses import Response

from ..auth import Ctx
from ..connect import build_base_urls, host_port
from ..deps import get_ctx

router = APIRouter()


@router.get("/v1/connect/info")
def connect_info(request: Request, ctx: Ctx = Depends(get_ctx)):
    """Admin: data for the "scan to connect" QR shown in the PWA settings tab."""
    ctx.require_admin(request)
    return {
        "base_urls": build_base_urls(request),
        "invite_code": ctx.cfg.invite_code,
    }


@router.get("/v1/connect/qr")
def connect_qr(request: Request, ctx: Ctx = Depends(get_ctx), host: str | None = None):
    """Admin: the QR itself as SVG. `host` overrides the address (multi-NIC)."""
    import segno

    ctx.require_admin(request)
    scheme = request.headers.get("x-forwarded-proto") or request.url.scheme
    if host:
        # explicit override replaces the address but keeps the deep-link path/port
        _orig, port = host_port(request.headers.get("host"), scheme)
        netloc = f"{host}:{port}" if port else host
        base = f"{scheme}://{netloc}/app"
    else:
        bases = build_base_urls(request)
        base = bases[0] if bases else "http://127.0.0.1:8000/app"
    url = base + f"#invite={ctx.cfg.invite_code or ''}"
    qr = segno.make(url, error="m")
    buf = io.BytesIO()
    qr.save(buf, kind="svg", scale=8, border=2, dark="#000000", light="#ffffff")
    return Response(buf.getvalue(), media_type="image/svg+xml")