"""
EU-Utility - Audio/Sound Service

Sound playback for notifications and alerts.
Part of core - plugins access via PluginAPI.
"""

import platform
import threading
from pathlib import Path
from typing import Dict, Optional
from dataclasses import dataclass


@dataclass
class SoundConfig:
    """Sound configuration."""
    enabled: bool = True
    volume: float = 0.7
    sounds_dir: Optional[Path] = None


class AudioManager:
    """
    Core audio service for sound playback.
    Uses QSoundEffect when available, falls back to system tools.
    """
    
    _instance = None
    _lock = threading.Lock()
    
    def __new__(cls):
        if cls._instance is None:
            with cls._lock:
                if cls._instance is None:
                    cls._instance = super().__new__(cls)
                    cls._instance._initialized = False
        return cls._instance
    
    def __init__(self):
        if self._initialized:
            return
        
        self._initialized = True
        self._config = SoundConfig()
        self._sound_cache: Dict[str, any] = {}
        self._available = False
        self._backend = None
        
        self._init_backend()
    
    def _init_backend(self):
        """Initialize audio backend."""
        # Try QSoundEffect first (best Qt integration)
        try:
            from PyQt6.QtMultimedia import QSoundEffect
            self._available = True
            self._backend = 'qt'
            print("[Audio] Using Qt Multimedia backend")
            return
        except ImportError:
            pass
        
        # Try playsound
        try:
            from playsound import playsound
            self._available = True
            self._backend = 'playsound'
            print("[Audio] Using playsound backend")
            return
        except ImportError:
            pass
        
        # Fallback to system tools
        system = platform.system()
        if system == "Windows":
            try:
                import winsound
                self._available = True
                self._backend = 'winsound'
                print("[Audio] Using Windows winsound backend")
                return
            except ImportError:
                pass
        
        print("[Audio] WARNING: No audio backend available")
        print("[Audio] Install one of: PyQt6.QtMultimedia, playsound")
    
    def is_available(self) -> bool:
        """Check if audio is available."""
        return self._available
    
    def play_sound(self, sound_key: str = "default"):
        """Play a sound by key."""
        if not self._available or not self._config.enabled:
            return
        
        sound_file = self._get_sound_file(sound_key)
        if not sound_file:
            # Use system beep as fallback
            self._play_beep()
            return
        
        try:
            if self._backend == 'qt':
                self._play_qt(sound_file)
            elif self._backend == 'playsound':
                self._play_playsound(sound_file)
            elif self._backend == 'winsound':
                self._play_winsound(sound_file)
        except Exception as e:
            print(f"[Audio] Play error: {e}")
    
    def _get_sound_file(self, key: str) -> Optional[Path]:
        """Get sound file path."""
        if not self._config.sounds_dir:
            return None
        
        sound_map = {
            'default': 'notification.wav',
            'global': 'global.wav',
            'hof': 'hof.wav',
            'skill_gain': 'skill.wav',
            'alert': 'alert.wav',
            'error': 'error.wav',
            'success': 'success.wav',
        }
        
        filename = sound_map.get(key, f"{key}.wav")
        sound_file = self._config.sounds_dir / filename
        
        # Try alternative extensions
        if not sound_file.exists():
            for ext in ['.mp3', '.ogg', '.wav']:
                alt = sound_file.with_suffix(ext)
                if alt.exists():
                    return alt
        
        return sound_file if sound_file.exists() else None
    
    def _play_qt(self, sound_file: Path):
        """Play using Qt."""
        from PyQt6.QtMultimedia import QSoundEffect
        
        sound_key = str(sound_file)
        if sound_key not in self._sound_cache:
            effect = QSoundEffect()
            effect.setSource(str(sound_file))
            effect.setVolume(self._config.volume)
            self._sound_cache[sound_key] = effect
        
        effect = self._sound_cache[sound_key]
        effect.play()
    
    def _play_playsound(self, sound_file: Path):
        """Play using playsound."""
        from playsound import playsound
        import threading
        
        # playsound blocks, so run in thread
        def play():
            try:
                playsound(str(sound_file), block=False)
            except:
                pass
        
        threading.Thread(target=play, daemon=True).start()
    
    def _play_winsound(self, sound_file: Path):
        """Play using Windows winsound."""
        import winsound
        
        try:
            winsound.PlaySound(str(sound_file), winsound.SND_ASYNC)
        except:
            winsound.MessageBeep()
    
    def _play_beep(self):
        """System beep fallback."""
        system = platform.system()
        if system == "Windows":
            try:
                import winsound
                winsound.MessageBeep()
            except:
                pass
        else:
            print('\a')  # Bell character
    
    def set_volume(self, volume: float):
        """Set volume (0.0 - 1.0)."""
        self._config.volume = max(0.0, min(1.0, volume))
        
        # Update cached effects
        for effect in self._sound_cache.values():
            if hasattr(effect, 'setVolume'):
                effect.setVolume(self._config.volume)
    
    def set_enabled(self, enabled: bool):
        """Enable/disable sounds."""
        self._config.enabled = enabled
    
    def is_muted(self) -> bool:
        """Check if muted."""
        return not self._config.enabled
    
    def mute(self):
        """Mute sounds."""
        self._config.enabled = False
    
    def unmute(self):
        """Unmute sounds."""
        self._config.enabled = True
    
    def set_sounds_directory(self, path: Path):
        """Set directory containing sound files."""
        self._config.sounds_dir = Path(path)
    
    def get_backend(self) -> Optional[str]:
        """Get current audio backend name."""
        return self._backend
    
    def get_volume(self) -> float:
        """Get current volume (0.0 - 1.0)."""
        return self._config.volume
    
    def shutdown(self):
        """Shutdown audio manager and cleanup resources."""
        # Stop any playing sounds
        for effect in self._sound_cache.values():
            if hasattr(effect, 'stop'):
                effect.stop()
        self._sound_cache.clear()


def get_audio_manager() -> AudioManager:
    """Get global AudioManager instance."""
    return AudioManager()