# -*- coding: utf-8 -*-
"""
Source-Manager.

Verwaltet mehrere Musikquellen und bietet einheitlichen Zugriff.
"""

import asyncio
import logging
from typing import Any, AsyncIterator

from trixy_core.music.sources.base import MusicSource, SourceType, SourceState, SourceInfo
from trixy_core.music.track import Track, TrackMetadata


class SourceManager:
    """
    Verwaltet mehrere Musikquellen.

    Bietet einheitlichen Zugriff auf alle registrierten Quellen:
    - Lokale Dateien
    - USB-Speicher
    - URL-Streams
    - (zukünftig) Streaming-Dienste
    """

    def __init__(self) -> None:
        """Initialisiert den SourceManager."""
        self._sources: dict[str, MusicSource] = {}
        self._default_source: str = ""
        self.logger = logging.getLogger(__name__)

    # ==========================================================================
    # Properties
    # ==========================================================================

    @property
    def sources(self) -> list[MusicSource]:
        """Alle registrierten Quellen."""
        return list(self._sources.values())

    @property
    def source_count(self) -> int:
        """Anzahl der Quellen."""
        return len(self._sources)

    @property
    def total_track_count(self) -> int:
        """Gesamtzahl der Tracks über alle Quellen."""
        return sum(source.track_count for source in self._sources.values())

    @property
    def default_source(self) -> MusicSource | None:
        """Standard-Quelle."""
        return self._sources.get(self._default_source)

    # ==========================================================================
    # Quellen-Management
    # ==========================================================================

    def register(
        self,
        source: MusicSource,
        name: str = "",
        set_default: bool = False,
    ) -> str:
        """
        Registriert eine Musikquelle.

        Args:
            source: Musikquelle
            name: Optionaler eindeutiger Name
            set_default: Als Standard-Quelle setzen

        Returns:
            Registrierter Name
        """
        # Name generieren falls nicht angegeben
        if not name:
            name = f"{source.source_type.value}_{len(self._sources)}"

        # Eindeutigkeit prüfen
        if name in self._sources:
            i = 1
            while f"{name}_{i}" in self._sources:
                i += 1
            name = f"{name}_{i}"

        self._sources[name] = source
        self.logger.debug(f"Quelle registriert: {name} ({source.source_type.value})")

        if set_default or not self._default_source:
            self._default_source = name

        return name

    def unregister(self, name: str) -> bool:
        """
        Entfernt eine Musikquelle.

        Args:
            name: Quellen-Name

        Returns:
            True wenn entfernt
        """
        if name in self._sources:
            del self._sources[name]

            if self._default_source == name:
                self._default_source = next(iter(self._sources), "")

            self.logger.debug(f"Quelle entfernt: {name}")
            return True
        return False

    def get(self, name: str) -> MusicSource | None:
        """
        Holt Quelle nach Name.

        Args:
            name: Quellen-Name

        Returns:
            Quelle oder None
        """
        return self._sources.get(name)

    def get_by_type(self, source_type: SourceType) -> list[MusicSource]:
        """
        Holt alle Quellen eines Typs.

        Args:
            source_type: Quellen-Typ

        Returns:
            Liste der Quellen
        """
        return [s for s in self._sources.values() if s.source_type == source_type]

    def set_default(self, name: str) -> bool:
        """
        Setzt Standard-Quelle.

        Args:
            name: Quellen-Name

        Returns:
            True wenn gesetzt
        """
        if name in self._sources:
            self._default_source = name
            return True
        return False

    # ==========================================================================
    # Lifecycle
    # ==========================================================================

    async def connect_all(self) -> dict[str, bool]:
        """
        Verbindet alle Quellen.

        Returns:
            Dict Name → Erfolg
        """
        results = {}

        tasks = {
            name: source.connect()
            for name, source in self._sources.items()
        }

        for name, task in tasks.items():
            try:
                results[name] = await task
            except Exception as e:
                self.logger.error(f"Verbindung zu {name} fehlgeschlagen: {e}")
                results[name] = False

        self.logger.info(f"Quellen verbunden: {sum(results.values())}/{len(results)}")
        return results

    async def disconnect_all(self) -> None:
        """Trennt alle Quellen."""
        for source in self._sources.values():
            try:
                await source.disconnect()
            except Exception as e:
                self.logger.error(f"Trennen fehlgeschlagen: {e}")

    async def scan_all(self) -> dict[str, int]:
        """
        Scannt alle Quellen.

        Returns:
            Dict Name → Anzahl Tracks
        """
        results = {}

        # Parallel scannen
        async def scan_source(name: str, source: MusicSource) -> tuple[str, int]:
            try:
                count = await source.scan()
                return (name, count)
            except Exception as e:
                self.logger.error(f"Scan von {name} fehlgeschlagen: {e}")
                return (name, 0)

        tasks = [
            scan_source(name, source)
            for name, source in self._sources.items()
        ]

        for coro in asyncio.as_completed(tasks):
            name, count = await coro
            results[name] = count

        total = sum(results.values())
        self.logger.info(f"Scan abgeschlossen: {total} Tracks gesamt")
        return results

    # ==========================================================================
    # Track-Zugriff
    # ==========================================================================

    async def get_track(self, track_id: str) -> Track | None:
        """
        Sucht Track in allen Quellen.

        Args:
            track_id: Track-ID

        Returns:
            Track oder None
        """
        for source in self._sources.values():
            track = await source.get_track(track_id)
            if track:
                return track
        return None

    async def get_track_from_source(
        self,
        source_name: str,
        track_id: str,
    ) -> Track | None:
        """
        Holt Track von bestimmter Quelle.

        Args:
            source_name: Quellen-Name
            track_id: Track-ID

        Returns:
            Track oder None
        """
        source = self._sources.get(source_name)
        if source:
            return await source.get_track(track_id)
        return None

    def get_all_tracks(self) -> list[Track]:
        """
        Holt alle Tracks aus allen Quellen.

        Returns:
            Liste aller Tracks
        """
        all_tracks = []
        for source in self._sources.values():
            all_tracks.extend(source.tracks)
        return all_tracks

    # ==========================================================================
    # Streaming
    # ==========================================================================

    async def get_audio_stream(self, track: Track) -> AsyncIterator[bytes]:
        """
        Liefert Audio-Stream für Track.

        Findet automatisch die richtige Quelle.

        Args:
            track: Track zum Streamen

        Yields:
            Audio-Daten in Chunks
        """
        # Quelle anhand source_type finden
        for source in self._sources.values():
            if source.source_type.value == track.source_type:
                async for chunk in source.get_audio_stream(track):
                    yield chunk
                return

        # Fallback: Alle Quellen durchsuchen
        for source in self._sources.values():
            found = await source.get_track(track.id)
            if found:
                async for chunk in source.get_audio_stream(track):
                    yield chunk
                return

        self.logger.warning(f"Keine Quelle für Track: {track.id}")

    # ==========================================================================
    # Suche
    # ==========================================================================

    async def search(
        self,
        query: str,
        limit: int = 50,
        source_types: list[SourceType] | None = None,
    ) -> list[Track]:
        """
        Sucht in allen (oder ausgewählten) Quellen.

        Args:
            query: Suchstring
            limit: Maximale Ergebnisse
            source_types: Optionale Einschränkung auf Quellen-Typen

        Returns:
            Liste der gefundenen Tracks
        """
        results = []

        for source in self._sources.values():
            # Typ-Filter
            if source_types and source.source_type not in source_types:
                continue

            # Suchen
            try:
                tracks = await source.search(query, limit=limit - len(results))
                results.extend(tracks)

                if len(results) >= limit:
                    break

            except Exception as e:
                self.logger.error(f"Suche in {source.name} fehlgeschlagen: {e}")

        return results[:limit]

    # ==========================================================================
    # Metadaten
    # ==========================================================================

    async def get_metadata(self, track: Track) -> TrackMetadata | None:
        """
        Lädt Metadaten für Track.

        Args:
            track: Track

        Returns:
            Metadaten oder None
        """
        for source in self._sources.values():
            if source.source_type.value == track.source_type:
                return await source.get_metadata(track)

        return track.metadata

    async def get_artwork(self, track: Track) -> bytes | None:
        """
        Lädt Artwork für Track.

        Args:
            track: Track

        Returns:
            Artwork-Daten oder None
        """
        for source in self._sources.values():
            if source.source_type.value == track.source_type:
                return await source.get_artwork(track)

        return None

    # ==========================================================================
    # Status
    # ==========================================================================

    def get_status(self) -> dict[str, Any]:
        """
        Liefert Status aller Quellen.

        Returns:
            Status-Dictionary
        """
        return {
            "source_count": self.source_count,
            "total_tracks": self.total_track_count,
            "default_source": self._default_source,
            "sources": {
                name: {
                    "type": source.source_type.value,
                    "state": source.state.value,
                    "track_count": source.track_count,
                    "is_available": source.is_available,
                }
                for name, source in self._sources.items()
            },
        }

    def get_source_infos(self) -> list[SourceInfo]:
        """
        Liefert Informationen über alle Quellen.

        Returns:
            Liste von SourceInfo
        """
        return [source.get_info() for source in self._sources.values()]

    def __contains__(self, name: str) -> bool:
        return name in self._sources

    def __getitem__(self, name: str) -> MusicSource:
        return self._sources[name]

    def __iter__(self):
        return iter(self._sources.values())

    def __len__(self) -> int:
        return len(self._sources)

    def __repr__(self) -> str:
        return (
            f"SourceManager(sources={self.source_count}, "
            f"tracks={self.total_track_count})"
        )