// Video Auth HTTP Route
// Purpose: Wires the MediaMTX auth endpoint to session validation, audit logging, and policy checks.
// Scope: Handles request transport and token/session lookup while delegating stream parsing and auth decisions.
function registerVideoAuthRoute(deps) {
  const {
    app,
    io,
    logger,
    videoSessions,
    getRequestIp,
    logAdminEvent,
    extractStreamInfoFromBody,
    canAccessStream,
  } = deps;

  app.post('/mediamtx/auth', (req, res) => {
    const body = req.body || {};
    const path = (body.path || '').replace(/^\//, '');
    const sessionId = body.user;
    const action = (body.action || '').toLowerCase();
    const protocol = (body.protocol || '').toLowerCase();
    const ip = getRequestIp(req, body.ip);
    const streamInfo = extractStreamInfoFromBody(body);

    logger.info('video auth request', { path: body.path, sessionId, stream: streamInfo, action, protocol });
    if (ip) {
      logAdminEvent({
        label: 'mediamtx',
        message: 'Media auth request',
        ip,
        meta: { path: body.path, sessionId, stream: streamInfo, action, protocol },
      });
    }

    const isSrtLikeProtocol = protocol === 'srt' || protocol === 'srtconn' || protocol.startsWith('srt');
    const isForwardAudioRead = action === 'read' && streamInfo?.id?.endsWith('-fwd');
    if ((action === 'read' && isSrtLikeProtocol) || isForwardAudioRead) {
      return res.status(200).end();
    }
    if (action === 'publish' && isSrtLikeProtocol) {
      return res.status(200).end();
    }

    if (!sessionId || !streamInfo?.id) {
      logger.warn('auth missing session or stream (session=%s path=%s)', sessionId, path);
      return res.status(401).end();
    }

    const info = videoSessions.getSession(sessionId);
    const streamTypeMatches =
      info &&
      (info.sourceType === streamInfo.type || (info.sourceType === 'roverMic' && streamInfo.type === 'rover'));
    if (!info || !streamTypeMatches || info.sourceId !== streamInfo.id) {
      logger.warn('invalid session %s for stream %s:%s', sessionId, streamInfo.type, streamInfo.id);
      return res.status(401).end();
    }

    const socket = io.sockets.sockets.get(info.socketId);
    if (!socket) {
      videoSessions.revokeSession(sessionId);
      return res.status(401).end();
    }

    if (!canAccessStream({ socket, streamInfo, action, sourceType: info.sourceType })) {
      return res.status(401).end();
    }

    return res.status(200).end();
  });
}

module.exports = {
  registerVideoAuthRoute,
};