using Microsoft.AspNetCore.Mvc;
using Campus_live_rewrite.api.dbs;

namespace Campus_live_rewrite.Controllers
{
    // ---------------------------------------------------------------------------------
    // Room lookup for the Tachyon voice server.
    //
    // Tachyon has NO room id on its wire - the client's voice ConnectionData carries only
    // the AccountId (plaintext) plus opaque RSA blobs. So Tachyon resolves which room a
    // speaker is in by asking us: GET /tachyon?id=<AccountId>, expecting a BARE numeric
    // roomInstanceId in text/plain (see tachyon-server-master/src/room_lookup.cpp - it
    // strtoull's the body and treats 0 / non-200 / non-numeric as "isolate this client",
    // i.e. they hear no one). It scopes its Dissonance relay per returned room id.
    //
    // Set Tachyon's config  room_url = https://<host>/tachyon  (it appends ?id=<n>).
    //
    // Unauthenticated on purpose: room_lookup.cpp issues a plain GET with no token, exactly
    // as the RecFlare reference does. The only thing exposed is which room-instance a given
    // account is in, keyed on a numeric id we already hand out publicly; the id is validated
    // as an integer before use. Returns "0" (nowhere) for anything we can't positively place,
    // which fails safe: Tachyon isolates the client rather than leaking cross-room voice.
    // ---------------------------------------------------------------------------------
    [ApiController]
    public class TachyonController : ControllerBase
    {
        [HttpGet("/tachyon")]
        public IActionResult ResolveRoom([FromQuery] string? id)
        {
            if (string.IsNullOrWhiteSpace(id) || !ulong.TryParse(id, out var accountId))
                return Content("0", "text/plain");

            var (online, room) = HeartbeatDB.PeekPresence(accountId);
            long instance = (online && room != null) ? room.roomInstanceId : 0;

            return Content(instance.ToString(), "text/plain");
        }
    }
}