Playtube/playtube/discord_rpc.py

"""Discord Rich Presence Integration.

Laeuft in einem eigenen Thread (pypresence macht blockierende IPC-Aufrufe), damit die
Oberflaeche nie haengt, egal ob Discord laeuft, gerade startet oder gar nicht
installiert ist. Verbindungsfehler werden abgefangen und in Intervallen erneut
versucht, ohne die App zu beeintraechtigen.
"""
from __future__ import annotations

import os
import queue
import time
from typing import Any

from PySide6.QtCore import QThread

from .config import APP_NAME

# Asset-Keys, die (optional) unter discord.com/developers/applications -> Rich
# Presence -> Art Assets hochgeladen werden koennen. Fehlen sie, zeigt Discord
# einfach kein Bild an - es gibt keinen Fehler.
ASSET_YOUTUBE = "youtube_logo"
ASSET_MUSIC = "music_logo"
ASSET_DEFAULT = "logo"
ASSET_PLAY = "play_icon"
ASSET_PAUSE = "pause_icon"

_RECONNECT_DELAY_SECONDS = 10


def _truncate(text: str | None, limit: int = 128, fallback: str = "") -> str:
    text = (text or fallback).strip()
    if not text:
        text = fallback
    if len(text) > limit:
        text = text[: limit - 1].rstrip() + "…"
    return text


def build_presence_payload(info: dict[str, Any], session_start: int) -> dict[str, Any]:
    """Baut das update()-Payload fuer pypresence aus den vom Browser-Tab gelieferten
    Medien-Informationen."""
    is_music = bool(info.get("isMusic"))
    playing = bool(info.get("playing"))
    title = _truncate(info.get("title"), fallback="Unbekannter Titel")
    default_state = "YouTube Music" if is_music else "YouTube"
    state = _truncate(info.get("subtitle"), fallback=default_state)

    payload: dict[str, Any] = {
        "details": title,
        "state": state,
        "large_image": ASSET_MUSIC if is_music else ASSET_YOUTUBE,
        "large_text": "YouTube Music" if is_music else "YouTube",
        "small_image": ASSET_PLAY if playing else ASSET_PAUSE,
        "small_text": "Spielt" if playing else "Pausiert",
    }

    duration = info.get("duration") or 0
    current_time = info.get("currentTime") or 0
    if playing:
        start_ts = int(time.time() - current_time)
        payload["start"] = start_ts
        if duration and duration > 0:
            payload["end"] = start_ts + int(duration)

    url = info.get("url")
    if url and isinstance(url, str) and url.startswith("http"):
        label = "In YouTube Music öffnen" if is_music else "Auf YouTube ansehen"
        payload["buttons"] = [{"label": label, "url": url}]

    return payload


def build_idle_payload(session_start: int) -> dict[str, Any]:
    return {
        "details": f"Bei {APP_NAME}",
        "state": "Stöbert gerade",
        "large_image": ASSET_DEFAULT,
        "large_text": APP_NAME,
        "start": session_start,
    }


class DiscordRPCWorker(QThread):
    """Eigener Thread, der die Verbindung zu Discord haelt und Presence-Updates
    debounced (max. 1 Update pro `interval` Sekunden) versendet."""

    def __init__(self, client_id: str, interval: float, show_idle: bool, parent=None):
        super().__init__(parent)
        self._client_id = client_id
        self._interval = max(5.0, float(interval))
        self._show_idle = show_idle
        self._queue: "queue.Queue[dict | None | object]" = queue.Queue(maxsize=1)
        self._running = True
        self._connected = False
        self._presence = None
        self._session_start = int(time.time())

    def submit_media_info(self, info: dict[str, Any] | None) -> None:
        """Neuester bekannter Zustand (None = nichts spielt / idle)."""
        self._replace_queue(info if info is not None else _IDLE_SENTINEL)

    def _replace_queue(self, item) -> None:
        try:
            self._queue.get_nowait()
        except queue.Empty:
            pass
        try:
            self._queue.put_nowait(item)
        except queue.Full:
            pass

    def stop(self) -> None:
        self._running = False
        self._replace_queue(_STOP_SENTINEL)

    def run(self) -> None:
        last_sent = 0.0
        while self._running:
            try:
                item = self._queue.get()
            except Exception:
                break

            if item is _STOP_SENTINEL or not self._running:
                break

            wait = self._interval - (time.time() - last_sent)
            if wait > 0:
                time.sleep(wait)
                # Waehrend des Wartens evtl. neuere Daten uebernehmen (debounce).
                try:
                    while True:
                        item = self._queue.get_nowait()
                except queue.Empty:
                    pass

            if item is _STOP_SENTINEL or not self._running:
                break

            self._ensure_connected()
            if self._connected:
                self._send(item)
                last_sent = time.time()
            else:
                # Nicht verbunden -> nicht sinnlos oft versuchen.
                time.sleep(_RECONNECT_DELAY_SECONDS)

        self._cleanup()

    def _ensure_connected(self) -> None:
        if self._connected:
            return
        try:
            from pypresence import Presence

            self._presence = Presence(self._client_id)
            self._presence.connect()
            self._connected = True
            if os.environ.get("PLAYTUBE_DEBUG"):
                print("[discord-rpc] verbunden", flush=True)
        except Exception as exc:
            self._connected = False
            if os.environ.get("PLAYTUBE_DEBUG"):
                print(f"[discord-rpc] Verbindung fehlgeschlagen: {exc!r}", flush=True)

    def _send(self, item) -> None:
        if self._presence is None:
            return
        try:
            if item is _IDLE_SENTINEL:
                if self._show_idle:
                    payload = build_idle_payload(self._session_start)
                    self._presence.update(**payload)
                else:
                    payload = None
                    self._presence.clear()
            else:
                payload = build_presence_payload(item, self._session_start)
                self._presence.update(**payload)
            if os.environ.get("PLAYTUBE_DEBUG"):
                print(f"[discord-rpc] gesendet: {payload!r}", flush=True)
        except Exception as exc:
            # Discord evtl. geschlossen worden -> beim naechsten Mal neu verbinden.
            self._connected = False
            if os.environ.get("PLAYTUBE_DEBUG"):
                print(f"[discord-rpc] Senden fehlgeschlagen: {exc!r}", flush=True)

    def _cleanup(self) -> None:
        if self._presence is not None:
            try:
                self._presence.clear()
                self._presence.close()
            except Exception:
                pass


class _Sentinel:
    __slots__ = ()


_IDLE_SENTINEL = _Sentinel()
_STOP_SENTINEL = _Sentinel()