"""Direct authenticated transport to Deck's own ComfyUI, including WebSocket."""
import http.client
import socket
import select
from video_proxy import MAX_BODY,REQUEST_HEADERS,HOP_HEADERS

def relay(handler,port):
 if handler.headers.get('Transfer-Encoding'):raise ValueError('Content-Length erforderlich.')
 length=int(handler.headers.get('Content-Length','0'))
 if not 0<=length<=MAX_BODY:raise ValueError('Maximal 256 MiB pro Upload.')
 if handler.headers.get('Upgrade','').lower()=='websocket':
  with socket.create_connection(('127.0.0.1',port),timeout=10) as upstream:
   lines=[f'{handler.command} {handler.path} HTTP/1.1',f'Host: 127.0.0.1:{port}']
   for key in ('Upgrade','Connection','Sec-WebSocket-Key','Sec-WebSocket-Version','Sec-WebSocket-Protocol'):
    if handler.headers.get(key):lines.append(key+': '+handler.headers[key])
   upstream.sendall(('\r\n'.join(lines)+'\r\n\r\n').encode());head=b''
   while b'\r\n\r\n' not in head:
    chunk=upstream.recv(4096)
    if not chunk:raise ValueError('WebSocket-Verbindung abgebrochen.')
    head+=chunk
    if len(head)>65536:raise ValueError('Ungültige WebSocket-Antwort.')
   handler.sent=True;handler.connection.sendall(head);upstream.settimeout(None)
   while True:
    readable,_,_=select.select([upstream,handler.connection],[],[],60)
    if not readable:continue
    for source in readable:
     data=source.recv(65536)
     if not data:return
     (handler.connection if source is upstream else upstream).sendall(data)
 else:
  upstream=http.client.HTTPConnection('127.0.0.1',port,timeout=3600)
  try:
   headers={k:v for k,v in handler.headers.items() if k.lower() in REQUEST_HEADERS};headers['Content-Length']=str(length)
   upstream.putrequest(handler.command,handler.path)
   for key,value in headers.items():upstream.putheader(key,value)
   upstream.endheaders();remaining=length
   while remaining:
    chunk=handler.rfile.read(min(1024*1024,remaining))
    if not chunk:raise ValueError('Unvollständiger Upload.')
    upstream.send(chunk);remaining-=len(chunk)
   response=upstream.getresponse();handler.sent=True;handler.send_response(response.status)
   for key,value in response.getheaders():
    if key.lower() not in HOP_HEADERS|{'server','date'}:handler.send_header(key,value)
   handler.send_header('Connection','close');handler.end_headers();handler.close_connection=True
   if handler.command!='HEAD':
    while chunk:=response.read(1024*1024):handler.wfile.write(chunk)
  finally:upstream.close()