import io
import struct
import threading
import time
from typing import Optional, Tuple

try:
    import pygame
    PYGAME_AVAILABLE = True
except ImportError:
    PYGAME_AVAILABLE = False

class AudioPlayer:
    
    def __init__(self, wav_data: bytes):
        self.wav_data = wav_data
        self.player_thread: Optional[threading.Thread] = None
        self.stop_event = threading.Event()
        self.paused_event = threading.Event()
        self.paused_event.set()  
        self._parse_wav_header()
    
    def _parse_wav_header(self):
        if len(self.wav_data) < 44:
            self.valid = False
            return
        
        if self.wav_data[0:4] != b'RIFF' or self.wav_data[8:12] != b'WAVE':
            self.valid = False
            return
        
        fmt_chunk_offset = 12
        
        while fmt_chunk_offset < len(self.wav_data) - 8:
            chunk_id = self.wav_data[fmt_chunk_offset:fmt_chunk_offset+4]
            chunk_size = struct.unpack('<I', self.wav_data[fmt_chunk_offset+4:fmt_chunk_offset+8])[0]
            if chunk_id == b'fmt ':
                break
            fmt_chunk_offset += 8 + chunk_size
        else:
            self.valid = False
            return
        
        fmt_data = self.wav_data[fmt_chunk_offset+8:fmt_chunk_offset+8+chunk_size]
        if len(fmt_data) < 16:
            self.valid = False
            return
        self.audio_format = struct.unpack('<H', fmt_data[0:2])[0]
        self.num_channels = struct.unpack('<H', fmt_data[2:4])[0]
        self.sample_rate = struct.unpack('<I', fmt_data[4:8])[0]
        self.byte_rate = struct.unpack('<I', fmt_data[8:12])[0]
        self.block_align = struct.unpack('<H', fmt_data[12:14])[0]
        self.bits_per_sample = struct.unpack('<H', fmt_data[14:16])[0]
        
        data_chunk_offset = fmt_chunk_offset + 8 + chunk_size
        while data_chunk_offset < len(self.wav_data) - 8:
            chunk_id = self.wav_data[data_chunk_offset:data_chunk_offset+4]
            chunk_size = struct.unpack('<I', self.wav_data[data_chunk_offset+4:data_chunk_offset+8])[0]
            if chunk_id == b'data':
                self.audio_data = self.wav_data[data_chunk_offset+8:data_chunk_offset+8+chunk_size]
                self.audio_data_offset = data_chunk_offset + 8
                self.audio_data_size = chunk_size
                break
            data_chunk_offset += 8 + chunk_size
        else:
            self.valid = False
            return
        self.valid = True
        self.duration = len(self.audio_data) / self.byte_rate
    
    def is_valid(self) -> bool:
        return self.valid and PYGAME_AVAILABLE
    
    def start(self):
        if not self.is_valid() or self.player_thread is not None:
            return
        self.stop_event.clear()
        self.paused_event.set()  
        self.player_thread = threading.Thread(target=self._playback_thread)
        self.player_thread.start()
    
    def stop(self):
        self.stop_event.set()
        if self.player_thread:
            self.player_thread.join(timeout=1.0)
            self.player_thread = None
    
    def pause(self):
        self.paused_event.clear()
    
    def resume(self):
        self.paused_event.set()
    
    def seek(self, position: float):
        
        pass
    
    def _playback_thread(self):
        try:
            pygame.mixer.init(frequency=self.sample_rate, size=-self.bits_per_sample, 
                            channels=self.num_channels, buffer=4096)
            sound = pygame.mixer.Sound(buffer=self.audio_data)
            channel = sound.play()
            
            while not self.stop_event.is_set():
                
                self.paused_event.wait()
                if self.stop_event.is_set():
                    break
                
                if not channel.get_busy():
                    break
                time.sleep(0.01)
            
            if channel and channel.get_busy():
                channel.stop()
            pygame.mixer.quit()
        except Exception as e:
            print(f"Audio playback error: {e}")
    
    def get_position(self) -> float:
        
        return 0.0

class NullAudioPlayer:
    def __init__(self, wav_data: bytes):
        self.wav_data = wav_data
    
    def is_valid(self) -> bool:
        return False
    
    def start(self):
        pass
    
    def stop(self):
        pass
    
    def pause(self):
        pass
    
    def resume(self):
        pass
    
    def seek(self, position: float):
        pass
    
    def get_position(self) -> float:
        return 0.0

def create_audio_player(wav_data: bytes):
    if PYGAME_AVAILABLE and len(wav_data) >= 44 and wav_data[0:4] == b'RIFF':
        player = AudioPlayer(wav_data)
        if player.is_valid():
            return player
    return NullAudioPlayer(wav_data)