"""
nas_dl.py — Anade descargas al NAS Synology via API de Download Station.
Usado por pi_bot.py (comando 'descargar') y por videoclub.py.

Login:   POST /webapi/auth.cgi      (SYNO.API.Auth, version 6, session DownloadStation)
Crear:   POST /webapi/DownloadStation/task.cgi (SYNO.DownloadStation.Task, create)

La URI puede ser un enlace HTTP directo (p. ej. enlace de RealDebrid),
un magnet o una URL de fichero .torrent.
"""
import json
import os
import urllib.parse
import urllib.request

# Carga .env del directorio del script si existe (no requiere python-dotenv)
BASE = os.path.dirname(os.path.abspath(__file__))


def _load_env(path):
    env = {}
    try:
        for line in open(path):
            line = line.strip()
            if line and not line.startswith("#") and "=" in line:
                k, v = line.split("=", 1)
                env[k.strip()] = v.strip()
    except Exception:
        pass
    return env


ENV = _load_env(os.path.join(BASE, ".env"))
# Respaldo: si no hay credenciales NAS aqui, probar el .env de videoclub/
_VIDEOCLUB_ENV = _load_env(os.path.join(BASE, "..", "videoclub", ".env"))
for _k in ("NAS_HOST", "NAS_PORT", "NAS_USER", "NAS_PASS", "NAS_HTTPS",
           "TORRENTIO_RD_TOKEN"):
    if not ENV.get(_k):
        ENV[_k] = _VIDEOCLUB_ENV.get(_k, "")
NAS_HOST = os.getenv("NAS_HOST", ENV.get("NAS_HOST", "192.168.50.31")).strip().rstrip("/")
NAS_PORT = os.getenv("NAS_PORT", ENV.get("NAS_PORT", "5000")).strip()
NAS_USER = os.getenv("NAS_USER", ENV.get("NAS_USER", "")).strip()
NAS_PASS = os.getenv("NAS_PASS", ENV.get("NAS_PASS", "")).strip()
NAS_HTTPS = os.getenv("NAS_HTTPS", ENV.get("NAS_HTTPS", "0")).strip() == "1"
RD_TOKEN = os.getenv("TORRENTIO_RD_TOKEN", ENV.get("TORRENTIO_RD_TOKEN", "")).strip()

BASE_URL = f"{'https' if NAS_HTTPS else 'http'}://{NAS_HOST}:{NAS_PORT}"


def unrestrict_rd(uri):
    """Convierte un enlace real-debrid.com/d/XXX en el enlace directo descargable.
    Si el enlace no es de RealDebrid, lo devuelve tal cual."""
    if "real-debrid.com/" not in uri:
        return uri
    if not RD_TOKEN:
        print("[RD] Falta TORRENTIO_RD_TOKEN en .env")
        return uri
    try:
        data = urllib.parse.urlencode({"link": uri}).encode()
        req = urllib.request.Request(
            "https://api.real-debrid.com/rest/1.0/unrestrict/link",
            data=data, headers={"Authorization": f"Bearer {RD_TOKEN}"})
        with urllib.request.urlopen(req, timeout=30) as r:
            d = json.loads(r.read().decode("utf-8"))
        directo = d.get("download")
        if directo:
            print(f"[RD] Desrestrict OK: {directo[:80]}")
            return directo
        print(f"[RD] No devolvio enlace directo: {d.get('error', d)}")
    except Exception as e:
        print(f"[RD] Error desrestrict: {e}")
    return uri


def _api(path, params, session=None):
    """Llama a la API del NAS. DSM 7 exige GET con `_sid` en la query string.
    Si `session` viene como 'sid=<x>' se extrae y se anade a la query."""
    sid = None
    if session:
        if session.startswith("sid="):
            sid = session[4:]
        elif session.startswith("_sid="):
            sid = session[5:]
    if sid:
        params = dict(params)
        params["_sid"] = sid
    qs = urllib.parse.urlencode(params)
    req = urllib.request.Request(f"{BASE_URL}{path}?{qs}",
                                 headers={"Cookie": session or ""})
    with urllib.request.urlopen(req, timeout=20) as r:
        return json.loads(r.read().decode())


def login():
    """Devuelve la cookie de sesion DownloadStation o None."""
    if not NAS_USER or not NAS_PASS:
        print("[NAS] Faltan NAS_USER/NAS_PASS en .env")
        return None
    try:
        r = _api("/webapi/auth.cgi", {
            "api": "SYNO.API.Auth",
            "version": "6",
            "method": "login",
            "account": NAS_USER,
            "passwd": NAS_PASS,
            "session": "DownloadStation",
            "format": "cookie",
        })
        if r.get("success"):
            sid = r.get("data", {}).get("sid")
            return f"sid={sid}" if sid else None
        print(f"[NAS] Login fallido: {r.get('error')}")
    except Exception as e:
        print(f"[NAS] Error de login: {e}")
    return None


def add_torrent(uri, session=None):
    """Anade una URI (http/magnet/.torrent) a Download Station.
    Si es enlace de RealDebrid, primero se desrestricta a enlace directo."""
    uri = unrestrict_rd(uri)
    if not session:
        session = login()
    if not session:
        return False
    try:
        r = _api("/webapi/DownloadStation/task.cgi", {
            "api": "SYNO.DownloadStation.Task",
            "version": "3",
            "method": "create",
            "uri": uri,
        }, session=session)
        if r.get("success"):
            print(f"[NAS] Tarea anadida: {uri[:80]}")
            return True
        print(f"[NAS] Error al anadir tarea: {r.get('error')}")
    except Exception as e:
        print(f"[NAS] Error: {e}")
    return False


if __name__ == "__main__":
    import sys
    if len(sys.argv) < 2:
        print("Uso: python nas_dl.py <uri|magnet|enlace>")
        sys.exit(1)
    ok = add_torrent(sys.argv[1])
    sys.exit(0 if ok else 1)