#!/usr/bin/env python3
"""
OpenTransformers Audio Crawler v1.0
Grabby hands for audio data - speech, music, sound effects.

Grabs audio files + metadata (title, description, duration, tags)
Perfect for ASR, TTS, music generation training.

Usage:
    python audio_crawler.py --seeds audio_seeds.txt --output /workspace/audio --max-gb 10
    python audio_crawler.py --seed "https://freesound.org" --min-duration 5 --max-duration 300
"""

import asyncio
import aiohttp
import argparse
import hashlib
import json
import os
import re
import time
import random
import struct
from dataclasses import dataclass, asdict
from datetime import datetime
from pathlib import Path
from typing import Optional, Set, Dict, List, Tuple
from urllib.parse import urljoin, urlparse
from collections import defaultdict

# ============= AUDIO UTILITIES =============

AUDIO_EXTENSIONS = {'.mp3', '.wav', '.ogg', '.flac', '.m4a', '.aac', '.opus', '.wma'}
AUDIO_MIMES = {'audio/mpeg', 'audio/wav', 'audio/ogg', 'audio/flac', 'audio/mp4', 'audio/aac', 'audio/opus', 'audio/x-wav'}

def get_audio_info_from_header(data: bytes) -> Dict:
    """Extract audio info from file header"""
    info = {'format': 'unknown', 'duration': 0, 'sample_rate': 0, 'channels': 0}
    
    if len(data) < 12:
        return info
    
    # MP3 (ID3 or sync word)
    if data[:3] == b'ID3' or (data[0] == 0xff and (data[1] & 0xe0) == 0xe0):
        info['format'] = 'mp3'
        # Duration estimation from file size (rough: ~128kbps)
        # Real duration needs full parse
        
    # WAV/RIFF
    elif data[:4] == b'RIFF' and data[8:12] == b'WAVE':
        info['format'] = 'wav'
        # Parse fmt chunk
        i = 12
        while i < len(data) - 8:
            chunk_id = data[i:i+4]
            chunk_size = struct.unpack('<I', data[i+4:i+8])[0]
            if chunk_id == b'fmt ':
                if chunk_size >= 16:
                    info['channels'] = struct.unpack('<H', data[i+10:i+12])[0]
                    info['sample_rate'] = struct.unpack('<I', data[i+12:i+16])[0]
                break
            i += 8 + chunk_size
            
    # OGG
    elif data[:4] == b'OggS':
        info['format'] = 'ogg'
        
    # FLAC
    elif data[:4] == b'fLaC':
        info['format'] = 'flac'
        if len(data) >= 22:
            # STREAMINFO block
            info['sample_rate'] = (data[18] << 12) | (data[19] << 4) | (data[20] >> 4)
            info['channels'] = ((data[20] >> 1) & 0x7) + 1
            
    # M4A/AAC (ftyp)
    elif data[4:8] in (b'ftyp', b'M4A ', b'mp41', b'mp42', b'isom'):
        info['format'] = 'm4a'
        
    return info


def extract_audio_links(html: str, base_url: str) -> List[Dict]:
    """Extract audio links with context from HTML"""
    audio_links = []
    
    # Direct audio file links
    for match in re.finditer(r'href=["\']([^"\']+)["\']', html, re.I):
        href = match.group(1)
        lower = href.lower()
        if any(lower.endswith(ext) for ext in AUDIO_EXTENSIONS):
            try:
                absolute = urljoin(base_url, href)
                if absolute.startswith(('http://', 'https://')):
                    # Get surrounding text
                    start = max(0, match.start() - 150)
                    end = min(len(html), match.end() + 150)
                    context = re.sub(r'<[^>]+>', ' ', html[start:end])
                    context = re.sub(r'\s+', ' ', context).strip()
                    audio_links.append({
                        'url': absolute,
                        'context': context[:300],
                        'title': '',
                        'description': ''
                    })
            except:
                pass
    
    # HTML5 audio tags
    for match in re.finditer(r'<audio[^>]*>.*?</audio>', html, re.I | re.DOTALL):
        audio_tag = match.group(0)
        # Find source
        src_match = re.search(r'src=["\']([^"\']+)["\']', audio_tag, re.I)
        if not src_match:
            src_match = re.search(r'<source[^>]+src=["\']([^"\']+)["\']', audio_tag, re.I)
        if src_match:
            src = src_match.group(1)
            try:
                absolute = urljoin(base_url, src)
                if absolute.startswith(('http://', 'https://')):
                    audio_links.append({
                        'url': absolute,
                        'context': '',
                        'title': '',
                        'description': ''
                    })
            except:
                pass
    
    # Podcast RSS/feed links (grab for later)
    for match in re.finditer(r'<enclosure[^>]+url=["\']([^"\']+)["\']', html, re.I):
        url = match.group(1)
        if any(url.lower().endswith(ext) for ext in AUDIO_EXTENSIONS):
            audio_links.append({
                'url': url,
                'context': 'podcast',
                'title': '',
                'description': ''
            })
    
    return audio_links


def extract_page_links(html: str, base_url: str) -> Set[str]:
    """Extract page links for crawling"""
    links = set()
    for match in re.finditer(r'href=["\']([^"\']+)["\']', html, re.I):
        href = match.group(1)
        if href.startswith(('#', 'javascript:', 'mailto:', 'tel:', 'data:')):
            continue
        lower = href.lower()
        # Skip direct media files
        if any(lower.endswith(ext) for ext in AUDIO_EXTENSIONS | {'.mp4', '.avi', '.mov', '.jpg', '.png', '.gif'}):
            continue
        try:
            absolute = urljoin(base_url, href)
            if absolute.startswith(('http://', 'https://')):
                absolute = absolute.split('#')[0]
                if len(absolute) < 500:
                    links.add(absolute)
        except:
            pass
    return links


def get_domain(url: str) -> str:
    try:
        return urlparse(url).netloc.lower()
    except:
        return ""


# ============= CRAWLER =============

class AudioCrawler:
    USER_AGENTS = [
        'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 Chrome/120.0.0.0 Safari/537.36',
        'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 Chrome/120.0.0.0 Safari/537.36',
    ]
    
    def __init__(
        self,
        output_dir: str = 'audio_data',
        max_workers: int = 30,
        max_pages: int = 50000,
        max_bytes: int = 10 * 1024**3,
        timeout: int = 60,
        min_bytes: int = 50000,  # 50KB minimum
        max_bytes_per_file: int = 100 * 1024**2,  # 100MB max per file
        min_duration: int = 5,  # seconds (if detectable)
        max_duration: int = 600,  # 10 min max
    ):
        self.output_dir = Path(output_dir)
        self.output_dir.mkdir(parents=True, exist_ok=True)
        (self.output_dir / 'audio').mkdir(exist_ok=True)
        
        self.max_workers = max_workers
        self.max_pages = max_pages
        self.max_bytes = max_bytes
        self.timeout = timeout
        self.min_bytes = min_bytes
        self.max_bytes_per_file = max_bytes_per_file
        self.min_duration = min_duration
        self.max_duration = max_duration
        
        self.page_queue: asyncio.Queue = asyncio.Queue()
        self.seen_pages: Set[str] = set()
        self.seen_audio: Set[str] = set()
        self.seen_hashes: Set[str] = set()
        self.running = True
        
        self.stats = {'pages': 0, 'audio': 0, 'bytes': 0, 'skipped': 0, 'errors': 0}
        self.start_time = time.time()
        
        self.output_file = None
        self.output_lock = asyncio.Lock()
    
    def _report(self) -> str:
        elapsed = time.time() - self.start_time
        rate = self.stats['audio'] / elapsed if elapsed > 0 else 0
        mb = self.stats['bytes'] / (1024**2)
        return f"Pages: {self.stats['pages']} | Audio: {self.stats['audio']} | {mb:.1f} MB | {rate:.2f}/s | Skip: {self.stats['skipped']} | Err: {self.stats['errors']}"
    
    async def _fetch_page(self, session: aiohttp.ClientSession, url: str) -> Tuple[Optional[str], Set[str]]:
        try:
            headers = {'User-Agent': random.choice(self.USER_AGENTS)}
            async with session.get(url, headers=headers, timeout=self.timeout, ssl=False, allow_redirects=True) as resp:
                ct = resp.headers.get('content-type', '').lower()
                if 'text/html' not in ct and 'text/xml' not in ct and 'application/rss' not in ct:
                    return None, set()
                html = await resp.text(errors='ignore')
                links = extract_page_links(html, url)
                return html, links
        except:
            return None, set()
    
    async def _fetch_audio(self, session: aiohttp.ClientSession, audio_info: Dict, source_page: str) -> Optional[Dict]:
        url = audio_info['url']
        
        if url in self.seen_audio:
            return None
        self.seen_audio.add(url)
        
        try:
            headers = {'User-Agent': random.choice(self.USER_AGENTS)}
            async with session.get(url, headers=headers, timeout=self.timeout, ssl=False, allow_redirects=True) as resp:
                
                # Check content-length
                cl = resp.headers.get('content-length')
                if cl:
                    size = int(cl)
                    if size < self.min_bytes or size > self.max_bytes_per_file:
                        self.stats['skipped'] += 1
                        return None
                
                # Stream download
                data = await resp.read()
                
                if len(data) < self.min_bytes:
                    self.stats['skipped'] += 1
                    return None
                
                # Dedupe
                audio_hash = hashlib.md5(data).hexdigest()
                if audio_hash in self.seen_hashes:
                    self.stats['skipped'] += 1
                    return None
                self.seen_hashes.add(audio_hash)
                
                # Get audio info
                info = get_audio_info_from_header(data)
                
                # Determine extension
                ext = 'bin'
                for e in AUDIO_EXTENSIONS:
                    if url.lower().endswith(e):
                        ext = e[1:]
                        break
                if ext == 'bin':
                    ext = {'mp3': 'mp3', 'wav': 'wav', 'ogg': 'ogg', 'flac': 'flac', 'm4a': 'm4a'}.get(info['format'], 'mp3')
                
                # Save file
                fname = f"{audio_hash}.{ext}"
                fpath = self.output_dir / 'audio' / fname
                with open(fpath, 'wb') as f:
                    f.write(data)
                
                result = {
                    'url': url,
                    'source_page': source_page,
                    'domain': get_domain(url),
                    'timestamp': datetime.utcnow().isoformat(),
                    'context': audio_info.get('context', ''),
                    'title': audio_info.get('title', ''),
                    'description': audio_info.get('description', ''),
                    'format': info['format'],
                    'sample_rate': info['sample_rate'],
                    'channels': info['channels'],
                    'size_bytes': len(data),
                    'hash': audio_hash,
                    'file': fname
                }
                
                return result
                
        except Exception as e:
            self.stats['errors'] += 1
            return None
    
    async def _worker(self, session: aiohttp.ClientSession, worker_id: int):
        while self.running:
            try:
                page_url = await asyncio.wait_for(self.page_queue.get(), timeout=10.0)
            except asyncio.TimeoutError:
                if self.page_queue.empty():
                    break
                continue
            
            if self.stats['bytes'] >= self.max_bytes or self.stats['pages'] >= self.max_pages:
                self.running = False
                break
            
            html, links = await self._fetch_page(session, page_url)
            
            if html:
                self.stats['pages'] += 1
                
                # Extract and fetch audio
                audio_links = extract_audio_links(html, page_url)
                for audio_info in audio_links:
                    if not self.running:
                        break
                    
                    result = await self._fetch_audio(session, audio_info, page_url)
                    if result:
                        self.stats['audio'] += 1
                        self.stats['bytes'] += result['size_bytes']
                        
                        async with self.output_lock:
                            self.output_file.write(json.dumps(result) + '\n')
                
                # Queue new pages
                for link in links:
                    if link not in self.seen_pages and self.stats['pages'] < self.max_pages:
                        self.seen_pages.add(link)
                        await self.page_queue.put(link)
                
                if self.stats['pages'] % 50 == 0:
                    print(f"[{datetime.now().strftime('%H:%M:%S')}] {self._report()}")
            
            self.page_queue.task_done()
    
    async def crawl(self, seeds: List[str]):
        print(f"OpenTransformers Audio Crawler starting")
        print(f"Seeds: {len(seeds)} | Workers: {self.max_workers}")
        print(f"Target: {self.max_pages} pages / {self.max_bytes/1024**3:.1f} GB")
        print("-" * 60)
        
        for seed in seeds:
            self.seen_pages.add(seed)
            await self.page_queue.put(seed)
        
        timestamp = datetime.now().strftime('%Y%m%d_%H%M%S')
        output_path = self.output_dir / f'audio_{timestamp}.jsonl'
        self.output_file = open(output_path, 'w', buffering=1)
        
        connector = aiohttp.TCPConnector(limit=self.max_workers, ssl=False)
        async with aiohttp.ClientSession(connector=connector) as session:
            workers = [asyncio.create_task(self._worker(session, i)) for i in range(self.max_workers)]
            await asyncio.gather(*workers)
        
        self.output_file.close()
        
        print("-" * 60)
        print(f"DONE! {self._report()}")
        print(f"Metadata: {output_path}")
        audio_dir = self.output_dir / 'audio'
        files = list(audio_dir.glob('*'))
        print(f"Audio files: {len(files)} in {audio_dir}")


def main():
    p = argparse.ArgumentParser(description='OpenTransformers Audio Crawler')
    p.add_argument('--seeds', type=str, help='File with seed URLs')
    p.add_argument('--seed', type=str, action='append', help='Single seed URL')
    p.add_argument('--output', type=str, default='audio_data')
    p.add_argument('--workers', type=int, default=30)
    p.add_argument('--max-pages', type=int, default=50000)
    p.add_argument('--max-gb', type=float, default=10.0)
    p.add_argument('--timeout', type=int, default=60)
    p.add_argument('--min-kb', type=int, default=50)
    p.add_argument('--max-mb', type=int, default=100)
    
    args = p.parse_args()
    
    seeds = []
    if args.seeds:
        with open(args.seeds) as f:
            seeds.extend(line.strip() for line in f if line.strip())
    if args.seed:
        seeds.extend(args.seed)
    if not seeds:
        print("ERROR: Provide --seeds file or --seed URLs")
        return
    
    crawler = AudioCrawler(
        output_dir=args.output,
        max_workers=args.workers,
        max_pages=args.max_pages,
        max_bytes=int(args.max_gb * 1024**3),
        timeout=args.timeout,
        min_bytes=args.min_kb * 1024,
        max_bytes_per_file=args.max_mb * 1024**2,
    )
    
    asyncio.run(crawler.crawl(seeds))


if __name__ == '__main__':
    main()